Hach ORBISPHERE 31 series Basic User Manual

DOC024.98.93016

ORBISPHERE Model 31xxx

Electrochemical Sensors

10/2018, Edition 11

Basic User Manual

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English..............................................................................................................................3

Deutsch.......................................................................................................................... 18

Italiano............................................................................................................................ 36

Français......................................................................................................................... 52

Español.......................................................................................................................... 69

Nederlands....................................................................................................................86

Dansk............................................................................................................................103

Polski............................................................................................................................ 119

Svenska....................................................................................................................... 136

Română....................................................................................................................... 152

Türkçe...........................................................................................................................168

2

Sensor specifications

Specifications are subject to change without notice.

Sensor product line

Gas

Max. Pressure

rating (bar)

Sensor models Comments

O

2

20 31 11x.yz

Where :

x=Sensor special characteristics

(0 or 1; depending on application)

y=Membrane O-ring material

(0=EDPM; 1=Viton; 2=Kalrez; 4=Nitril)

z=Head material

(1=Stainless Steel; 2=Peek; 4=Hastelloy; 5=Titanium; 7= Monel)

Suffixes (when used):

A denotes a sensor with fast response to temperature change

E denotes an EEx certified sensor (Ex-Proof)

s denotes a Smart sensor

50 31 12x.yz

100 31 13x.yz

200 31 14x.yz

O

3

20 31 31x.yz

100 31 33x.yz

H

2

50 31 21x.yz

100 31 23x.yz

200 31 24x.yz

• All ORBISPHERE electrochemical sensor enclosures are certified IP68 / NEMA4

• PEEK (Polyetheretherketone) is a highly crystalline thermoplastic

Sensor membrane specifications

Hydrogen sensors

Specification

Membrane

2956A

Membrane

2952A

Membrane

2995A

Membrane

29015A

Recommended applications

Trace

measurement

Low

concentration

Average

concentration

High

concentration

Material PFA Tefzel

®

Tedlar

®

Saran

Thickness [μm] 25 25 12.5 23

Calibration gas 1% pure H

2

10% pure H

2

100% pure H

2

100% pure H

2

Dissolved measurement range 0 ppb to 75 ppb

0 ppb to

300 ppb

0 ppb to

3200 ppb

0 ppb to

32 ppm

Gaseous measurement range 0 Pa to 5 kPa 0 Pa to 20 kPa 0 Pa to 200 kPa

0 kPa to

2000 kPa

Accuracy

The greater of

±1% of reading or

± 0.03 ppb, or ±

1 Pa

The greater of

±1% of reading

or ± 0.09 ppb,

or ± 6 Pa

The greater of

±1% of reading or

± 1 ppb, or ±

50 Pa

The greater of

±1% of reading

or ± 10 ppb, or

± 1 kPa

Integrated radiation dose limit 2 x 10

4

10

8

10

8

N/A

Expected current in air @ 1 bar 25°C

[μA]

N/A

Expected current in pure gas [μA] 150 50 5 0.5

Temperature compensation range 0 to 50°C 0 to 50°C 10 to 45°C 10 to 45 °C

Temperature measuring range -5 to 100° C

English 3

Specification

Membrane

2956A

Membrane

2952A

Membrane

2995A

Membrane

29015A

Response time

1

2 seconds 5 seconds 6 seconds 50 seconds

Recommended minimum liquid flow

rate

2

[mL/min]

50 to 220 40 to 200 20 to 70 20 to 40

Recommended minimum linear flow

rate

2

[cm/sec]

200 150 50 30

Recommended gaseous flow rate

[L/min]

0.005 to 3

Oxygen sensors (table 1)

Specification

Membrane

2956A

Membrane

2958A

Membrane

29552A

Membrane

2952A

Recommended applications

Corrosion

control, De-

aerated water

Beverage, Lab.

applications

In line wort,

Air/O

2

injection,

Sewage

treatment

Corrosion

control, In line

beverage, De-

aerated water

Material PFA Tefzel

®

PTFE Tefzel

®

Thickness [μm] 25 12.5 50 25

Calibration gas Air Air Air Air / pure O

2

Dissolved measurement range 0 ppb to 20 ppm 0 ppb to 40 ppm 0 ppb to 80 ppm 0 ppb to 80 ppm

Gaseous measurement range 0 Pa to 50 kPa 0 Pa to 100 kPa 0 Pa to 200 kPa 0 Pa to 200 kPa

Accuracy

The greater of

±1% of reading

or ± 0.1 ppb

(1)

,

or ± 1 ppb

(2)

, or

± 0.25 Pa

The greater of

±1% of reading

or ± 1 ppb, or ±

2 Pa

The greater of

±1% of reading

or ± 2 ppb, or ±

5 Pa

The greater of

±1% of reading

or ± 2 ppb, or ±

5 Pa

(1)

Accuracy is ± 0.1 ppb for 410, 510, 362x, 360x and 3655 instruments

(2)

Accuracy is ± 1 ppb for 366x and 3650 instruments

Integrated radiation dose limit 2 x 10

4

10

8

N/A 10

8

Expected current in air @ 1 bar 25°C

[μA]

26.4 9.4 6.3 5.4

Expected current in pure O

2

[μA] 132 47 31.4 27

O

2

consumption in O

2

saturated water

at 25°C [μg/hour]

40 14 9.4 8

Temperature compensation range -5 to 60°C

Temperature measuring range -5 to 100° C

Response time

3

7.2 seconds 9.5 seconds 90 seconds 38 seconds

Recommended minimum liquid flow

rate

4

[mL/min]

180 120 50 50

1

Response time at 25°C for a 90% signal change

2

Liquid flow through an ORBISPHERE 32001 flow chamber, with protection cap and no grille

3

Response time at 25°C for a 90% signal change

4

Liquid flow through an ORBISPHERE 32001 flow chamber, with protection cap and no grille

4 English

Specification

Membrane

2956A

Membrane

2958A

Membrane

29552A

Membrane

2952A

Recommended minimum linear flow

rate

4

[cm/sec]

200 100 30 30

Recommended gaseous flow rate

[L/min]

0.1 to 3

Oxygen sensors (table 2)

Specification Membrane 2935A Membrane 29521A Membrane 2995A

Recommended applications

Saturated to super

saturated levels

Saturated to super

saturated levels

In line hot wort (up to

70°C)

Material Halar

®

Tefzel

®

Tedlar

®

Thickness [μm] 25 125 12.5

Calibration gas Air / Pure O

2

Air / Pure O

2

Pure O

2

Dissolved measurement range 0 ppb to 400 ppm 0 ppb to 400 ppm 0 ppb to 2000 ppm

Gaseous measurement range 0 Pa to 1000 kPa 0 Pa to 1000 kPa 0 Pa to 5000 kPa

Accuracy

The greater of ±1% of

reading or ± 10 ppb, or

± 20 Pa

The greater of ±1% of

reading or ± 10 ppb, or

± 20 Pa

The greater of ±1% of

reading or ± 50 ppb, or

± 100 Pa

Integrated radiation dose limit N/A 10

8

10

8

Expected current in air @ 1 bar 25°C

[μA]

0.9 0.7 0.2

Expected current in pure O

2

[μA] 4.7 3.8 0.9

O

2

consumption in O

2

saturated water

at 25°C [μg/hour]

1.4 1.3 0.3

Temperature compensation range -5 to 60°C

Temperature measuring range -5 to 100° C

Response time

5

2.5 minutes 18 minutes 80 seconds

Recommended minimum liquid flow

rate

6

[mL/min]

25 25 5

Recommended minimum linear flow

rate

6

[cm/sec]

20 60 5

Recommended gaseous flow rate

[L/min]

0.1 to 3

Ozone sensors

Specification Membrane 2956A Membrane 29552A

Recommended applications Trace measurement High concentration (> 1 mg/L)

Material PFA PTFE

Thickness [μm] 25 50

Calibration gas Span gas or air

5

Response time at 25°C for a 90% signal change

6

Liquid flow through an ORBISPHERE 32001 flow chamber, with protection cap and no grille

English 5

Specification Membrane 2956A Membrane 29552A

Dissolved measurement range 0 ppb to 50 ppm 0 ppb to 200 ppm

Gaseous measurement range 0 Pa to 10 kPa 0 Pa to 40 kPa

Accuracy

The greater of ±1% of reading (±

5% for sensors calibrated in air) or

± 5 ppb, or ±1 Pa

The greater of ±1% of reading (±

5% for sensors calibrated in air) or

± 20 ppb, or ± 4 Pa

Integrated radiation dose limit 2 x 10

4

N/A

Expected current in air @ 1 bar 25°C

[μA]

26.4 6.5

Expected current in pure gas [μA] 105 31.4

Temperature compensation range -5 to 45°C

Temperature measuring range -5 to 100° C

Response time

7

30 seconds 6 minutes

Recommended minimum liquid flow

rate

8

[mL/min]

350

9

100

9

Recommended minimum linear flow

rate

8

[cm/sec]

30 10

Recommended gaseous flow rate

[L/min]

0.01 to 3

Sensor weight and dimensions

Sensor weight is from 140 to 700 grams, depending on the construction material.

Figure 1 Sensor dimensions

Expanded manual version

For additional information, refer to the expanded version of this manual, which is available on the

manufacturer's website.

7

Response time at 25°C for a 90% signal change

8

Liquid flow through an ORBISPHERE 32001 flow chamber, with protection cap and no grille

9

These flow rates take into account the decomposition of ozone in the tubing between the line

and the flow chamber (theoretical flow rates in the absence of decomposition would be 10 times

less)

6 English

General information

In no event will the manufacturer be liable for direct, indirect, special, incidental or consequential

damages resulting from any defect or omission in this manual. The manufacturer reserves the right to

make changes in this manual and the products it describes at any time, without notice or obligation.

Revised editions are found on the manufacturer’s website.

Safety information

N O T I C E

The manufacturer is not responsible for any damages due to misapplication or misuse of this product including,

without limitation, direct, incidental and consequential damages, and disclaims such damages to the full extent

permitted under applicable law. The user is solely responsible to identify critical application risks and install

appropriate mechanisms to protect processes during a possible equipment malfunction.

Please read this entire manual before unpacking, setting up or operating this equipment. Pay

attention to all danger and caution statements. Failure to do so could result in serious injury to the

operator or damage to the equipment.

Make sure that the protection provided by this equipment is not impaired. Do not use or install this

equipment in any manner other than that specified in this manual.

Use of hazard information

D A N G E R

Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or serious injury.

W A R N I N G

Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or serious

injury.

C A U T I O N

Indicates a potentially hazardous situation that may result in minor or moderate injury.

N O T I C E

Indicates a situation which, if not avoided, may cause damage to the instrument. Information that requires special

emphasis.

Precautionary labels

Read all labels and tags attached to the instrument. Personal injury or damage to the instrument

could occur if not observed. A symbol on the instrument is referenced in the manual with a

precautionary statement.

This is the safety alert symbol. Obey all safety messages that follow this symbol to avoid potential

injury. If on the instrument, refer to the instruction manual for operation or safety information.

This symbol indicates that a risk of electrical shock and/or electrocution exists.

This symbol indicates the presence of devices sensitive to Electro-static Discharge (ESD) and

indicates that care must be taken to prevent damage with the equipment.

This symbol, when noted on a product, indicates the instrument is connected to alternate current.

English 7

Electrical equipment marked with this symbol may not be disposed of in European domestic or

public disposal systems. Return old or end-of-life equipment to the manufacturer for disposal at no

charge to the user.

Products marked with this symbol indicates that the product contains toxic or hazardous substances

or elements. The number inside the symbol indicates the environmental protection use period in

years.

What you have received

Check that all mounting hardware is included. Note that, unless the sensor is part of ORBISPHERE

equipment that includes it, the sensor must be installed in an ORBISPHERE socket or flow chamber

that allows contact with the sample flow to be analyzed (refer to Installation on page 8 for details).

An oxygen, ozone, or hydrogen electrochemical sensor

The sensor head is protected by a screw-on plastic storage cap. A plastic screw-on base protects the

connection socket, and provides at the same time a suitable stand.

Figure 2 Sensor components

1 Storage and calibration cap 3 Sensor base 5 Collar

2 Protection cap 4 Connection to instrument

A sensor maintenance kit

The maintenance kit includes the material needed to service and maintain the sensor.

Installation

Initial sensor cell cleaning

Your ORBISPHERE electrochemical sensor has been thoroughly cleaned and tested at the factory.

To protect the electrodes from oxidation, the cell has been filled with electrolyte and a membrane has

been installed.

However, shipping and storage conditions can adversely affect electrochemical sensor cells,

therefore a sensor service (cell cleaning & membrane replacement) must be performed before using

the sensor.

To perform a sensor service, see the instructions in the section entitled Maintenance on page 10. If

you are not familiar with sensor servicing, your Hach Lange representative will be glad to assist you.

Note: Electrochemical H

2

sensors do not require a complete cleaning procedure, as dechloridization and

rechloridization processes are normally not required.

Sensor positioning

Unless the sensor is part of the ORBISPHERE equipment that includes it, the sensor must be

installed in an ORBISPHERE socket or flow chamber, that allows the contact with the sample fluid to

be analyzed.

8

English

The sensor and measuring instrument are connected by a cable and two 10 pin connectors. The

standard sensor cable length is 3 meters, but extension cables of up to 1,000 meters are available,

still retaining the same signal sensitivity. If the model 28117 pressure sensor is used, the maximum

cable length is 50 meters.

Ensure that the sensor will be mounted:

• perpendicular to the pipe

• on a horizontal pipe section (or on flow-ascending vertical pipe)

• minimum of 15 meters away from the pump's discharge side

• in a place where the sample flow is stable and rapid, and as far as possible from:

• valves

• pipe bends

• the suction side of any pumps

• a CO

2

injection system or similar

Note: There may be situations where not all the above conditions can be met. If this is the case, or you have any

concerns, please consult your Hach Lange representative to appraise the situation and define the best applicable

solution.

Sensor insertion

• Insert the sensor straight into the flow chamber or socket. Do not twist the sensor.

• Hand tighten the attaching collar.

• Connect the sensor cable.

• Check for leaks; replace O-rings if product leaks are visible.

Instructions for micro volume flow chambers

Do not twist the sensor when inserting it into a micro volume flow chamber. This rotation may twist

the protection cap, thus changing the membrane position. This can modify the membrane measuring

conditions, and affect measurement precision.

Sensor removal

• If not using the ORBISPHERE 32003 insertion/extraction valve you will need to shut off the sample

flow and drain the sampling circuit of liquid.

• Remove the sensor cable connected at the sensor end.

• Hold the sensor body in one hand to avoid rotation, and unscrew the collar with the other hand.

• Pull the sensor straight out of the socket or flow chamber.

• Install the sensor storage cap and sensor base (to protect the connection).

External pressure sensor

The system can be fitted with an external pressure sensor. This enables a measure of fraction of gas

under variable pressure conditions during gas phase measurement.

Two models are available, depending on applied pressure:

• 28117 Pressure sensor 0 - 5 bar absolute

• 28117C Pressure sensor 0 - 1 bar absolute

C A U T I O N

Do NOT exceed the pressure range of the sensor. This would permanently deform the sensor membrane, thus

delivering incorrect pressure values in the future.

The external sensor connects to the ORBISPHERE measuring equipment with a 1 meter cable and a

4 pin connector (an optional extension cable can be used, but total length should not exceed

50 meters).

English

9

The external pressure sensor can be installed in the model 32002.xxx multi parameter flow chamber.

It is held in place by a blue threaded collar. Tightness is assured by the O-ring on the sensor seat.

Maintenance

Disassembly and assembly

Taking the sensor apart (membrane removal)

1. 2. 3. 4.

1. It is important to install the electrochemical sensor standing on its base. This base offers good

protection for the delicate connector socket, at the same time providing a suitable work stand.

2. Remove the plastic storage cap. Unscrew the protection cap, using the tool provided in the

maintenance kit.

3. Pay attention to the components inside the protection cap. Note the assembly order of each item.

4. Pull up the attaching ring with the tool provided in the maintenance kit. Remove the membrane

and mask (if applicable). Drain the electrolyte into a sink and rinse the sensor cavity with tap

water.

C A U T I O N

Avoid eye or skin contact with electrolyte which can be slightly corrosive.

5.

6.

7.

5. Insert the prongs of the membrane support removal tool into the membrane support holes.

6. Unscrew the membrane support.

7.

Note: The membrane support is individually machined and paired with the sensor. For correct sensor

operation, it is ESSENTIAL to keep a membrane support with its respective sensor. Should the membrane

support require replacement, contact your Hach Lange representative.

Sensor assembly (membrane installation)

Before starting the sensor reassembly, proceed to the sensor maintenance section for anode and

cathode cleaning instructions.

10

English

1.

2.

3.

1. Install the membrane support with the groove on the upper side.

Note: The membrane support is individually machined and paired with the sensor. Therefore make sure that

the correct membrane support is used on the correct sensor.

2. Insert the prongs of the membrane support removal tool into the membrane support holes.

3. Tighten the membrane support finger tight.

C A U T I O N

Too much torque will damage the sensor electrodes.

4. 5. 6. 7.

4. The membrane mounting surface must be clean and even. Replace the membrane O-ring on the

sensor head with a new one.

Note: The 29039.4 Nitril O-ring can be reused if it is still in good condition. Membrane O-rings are part of the

protection cap kit.

5. Using the syringe or bottle nozzle included in the maintenance kit, fill up the sensor cavity with

electrolyte. Be careful not to touch the electrodes with the needle, as a scratch on the surface

may lead to loss of performance. Tilt the sensor slightly and inject into the lower hole, pushing

bubbles out at the upper hole. Gently tap on the sensor side to move trapped bubbles. Return the

sensor to the vertical position. The last drop of electrolyte should form a cupola on top of the

sensor tip.

6. In the maintenance kit, pick up the two part membrane mounting tool. Install the sleeve over the

sensor head (end with shoulder downwards).

Note: Once installed, a membrane cannot be reused. Avoid touching the membrane with bare fingers, as this

may affect its sensitivity.

7. Take a few membranes out of the storage box. Using tweezers included in the kit, pick up one

membrane of the stack, and gently place it on the sensor tip. Make sure it is centered, and no

bubble is trapped. If a sensor mask is used, place it directly on top of the membrane. The

membrane diameter is larger than sensor head diameter. This is normal, as the membrane will

fold over the sensor tip.

Note: Distinguish the membrane from the protection paper:

• The membrane is transparent (translucent).

English

11

• The protection paper is opaque.

8. 9. 10. 11.

8. The membrane holding ring comes in two slightly different internal diameters, depending on the

membrane(s) total thickness (A = 29228 holding ring, membrane thickness < 50μ; B =

29229 holding ring, membrane(s) total thickness ≥ 50μ). For a correct membrane installation, be

sure to use the correct holding ring for the application.

9. Place the membrane holding ring on the installation tool tip.

C A U T I O N

To avoid damaging the membrane, make sure that the tool tip is totally clean and its surface is even.

10. Insert the installation tool inside the guiding sleeve.

11. Push the installation tool firmly downwards. This clasps the mounting ring onto the sensor head,

folding the membrane over the sensor tip. Remove the installation tool and guiding sleeve.

Visually check for correct ring placement, try to push it down with your fingers. Check that the

membrane is tight, with no wrinkles, and no bubbles are present. Rinse the sensor with tap water

and wipe dry with a clean cloth. Check for electrolyte leaks.

12.

13.

14.

12. Prepare the protection cap for installation. Replace all the parts inside the protection cap with new

ones (except the grille), and place them in the order they were removed. The Tefzel washers,

under the cap, should be slightly lubricated with silicone grease.

Note: The illustration is an example only. Your configuration may differ.

13. Tighten the protection cap finger tight. Then, complete the process using the tool provided in the

maintenance kit. Insert into each of the four holes in turn, and tighten as far as possible. Tighten

each hole only once.

Note: The grille inside the protection cap should be free to move during tightening. Therefore, and to avoid

damage to the membrane, do not touch the grille during the tightening process.

14. Always store the sensor with the storage cap and base installed. Put a few drops of clean water

in the storage cap to prevent the sensor cell drying.

Note: A sensor that has been taken apart or serviced must always be calibrated. Allow the sensor to settle for

30 minutes, before performing the sensor calibration.

12

English

Electrochemical cleaning and regeneration center

The ORBISPHERE 32301 is a very efficient cleaning and regeneration tool for electrochemical

sensors. This tool reverses the electrochemical process that is taking place in the sensor cell during

normal operation. This removes oxidation and at the same time regenerates the surface of the

electrodes. In addition, the regeneration center offers a continuity tester for checking the sensor

electronics.

Use of this tool is recommended for a noticeably extended sensor life. Detailed information on how to

use the cleaning and regeneration center is included in the 32301 Operator Manual.

Note: It is mandatory to use the 32301 Sensor Cleaning and Regeneration Center for servicing electrochemical H

2

sensors. This process is called dechloridization and rechloridization of the electrodes (see Hydrogen sensor cell

cleaning on page 15).

Chemical cleaning: oxygen and ozone sensor cell

Note: Not applicable for H

2

sensors.

The following supposes that the sensor has been taken apart. For disassembly and assembly

procedures, see Disassembly and assembly on page 10.

Conditions

Wear on the membrane, and chemical reactions within the sensor, requires that the sensor be

serviced regularly to restore its original sensitivity. Service includes electrode cleaning and

membrane replacement. A clear sign that a sensor maintenance is required is when measurements

are noticeably less stable than usual, and when a calibration does not improve the situation.

Method description (see following step-by-step procedure)

• Electrochemical cleaning with 32301 (if available)

… when not available or results are insufficient.

... for sensors used in harsh environments (e.g., hydrocarbon industry) or very dirty sensors.

• Anode and cathode chemical cleaning

• Central electrode polishing

• Final rinsing

Note: To eliminate any silver residue that ammonia cleaning cannot remove, it is sometimes required to repeat the

chemical cleaning using nitric acid (HNO

3

, not over 70% by weight).

Membrane support cleaning

1. Empty and rinse the electrolyte reservoir under tap

water.

2. Rinse membrane support under water and wipe it

dry.

3. Check for the presence of any residue on the

surfaces. Residue can be removed by placing the

support in a container of nitric acid (HNO

3

, not over

70% by weight) until it recovers its original

appearance (normally within 30 seconds).

Note: Only use nitric acid to clean very dirty membrane

support.

4. Rinse one minute under tap water and check again

for surface cleanliness.

C A U T I O N

Nitric acid is dangerous! Please refer to the safety information from your chemical supplier.

Electrodes ammonia cleaning

Note: Only use ammonia to clean very dirty sensors.

English

13

1. Fill the sensor electrolyte reservoir with a solution

of 25% by weight ammonium hydroxide (NH

4

OH) in

water and leave for 10 minutes.

2. Rinse with tap water for at least one minute.

3. Inspect the sensor head. The counter electrode

should be a silver-white color.

4. If the counter electrode still shows deposits, repeat

the procedure.

C A U T I O N

Ammonia is dangerous! Please refer to the safety information from your chemical supplier.

Anode and cathode nitric acid cleaning

Note: Only use nitric acid to clean very dirty sensors.

1. Check for the absence of silver deposit on the

central guard ring electrode walls, as such deposits

can make contact with the counter electrode.

2. To eliminate any silver residue inside the sensor

cell, it is sometimes required to repeat the chemical

cleaning using nitric acid (HNO

3

, not over 70% by

weight).

3. Also, the 32301 electrochemical cleaning does not

remove deposit on the cell’s plastic parts, so nitric

acid cleaning may be required.

Note: This procedure is not recommended for normal

maintenance, and should not be used more often than twice

a year, as the acid degrades the metal of the counter

electrode, thus reducing the sensor's life.

4. Place concentrated nitric acid into the sensor

electrolyte reservoir, and add 1 drop on the center

electrode.

5. Leave for no longer than 3 seconds.

6. Quickly empty the acid and rinse thoroughly under

tap water for one minute.

C A U T I O N

Nitric acid is dangerous! Please refer to the safety information from your chemical supplier.

Sensor face polishing

1.

2.

3.

1. Once the sensor has been cleaned, the face of the center electrode must be polished together

with the membrane support.

14

English

Note: Install the membrane support with the groove on the upper side. The membrane support is individually

machined and paired with the sensor. Therefore make sure that the correct membrane support is used on the

correct sensor.

2. Insert the prongs of the membrane support removal tool into the membrane support holes.

3. Tighten the membrane support finger tight.

C A U T I O N

Too much torque will damage the sensor electrodes.

4. 5. 6. 7.

4. Place the dish with the polishing cloth on a flat surface. Spread a little polishing powder onto the

cloth. Mix with a few drops of water to get a grey, milky liquid. Make sure to use the correct

polishing powder for your application.

Note: Use one polishing cloth per sensor model, to prevent a possible contamination through metal particle

transfer.

5. Holding the sensor vertically, and using a circular motion, polish the sensor face for at least

30 seconds, until the electrodes are clean and shiny. This step may need to be repeated several

times. Make sure to avoid skin contact with the polishing cloth; it should be kept free of dust and

grease.

6. Remove the membrane support with installation tool. Rinse the support and sensor cavity with a

strong jet of clean water. Use distilled water if the water quality is doubtful.

7. Carefully inspect that the tiny groove between the center electrode and the guard ring electrode is

totally clean and free of polishing residue. Clean only with a strong water spray. The edge of a

paper sheet can be used to remove sticking residue.

O

3

Sensor only: final center electrode cleaning

Once the O

3

sensor has been successfully cleaned and polished, a final nitric acid treatment should

be applied, as follows:

1. Place the sensor in a vertical position on its base.

2. Fill the electrolyte reservoir with a few drops of

water, just enough to cover the outer electrode. The

center electrode must be kept dry.

3. Place a drop of nitric acid on the center electrode,

covering only the electrode and guard ring. Avoid

spilling acid into the water. Wait less than a minute,

then rinse thoroughly under tap water.

C A U T I O N

Nitric acid is dangerous! Please refer to the safety information from your chemical supplier.

Hydrogen sensor cell cleaning

Conditions

The hydrogen analyzer works on the principle that hydrogen molecules, passing through the

membrane, generate an electric current at the platinum anode surface. For this to take place, an

extremely clean metal surface is essential. If any film, grease or other impurity covers the platinum

surface, the reaction is impeded and may even be stopped.

English

15

In addition, the chemical reaction that takes place on the chloridized silver cathode leads to loss of

performance after a certain operation time.

As a result, a sensor service must be carried out to restore its original performance.

Method

The procedure for cleaning the H

2

electrochemical sensor requires the use of the ORBISPHERE

32301 Sensor Cleaning and Regeneration Center. This procedure is explained in detail in the

32301 Operator's Manual.

As an overview, H

2

electrochemical sensor cleaning consists of the following sequence of operations:

• Dechloridization of the cathode: This process removes the chloride film from the silver cathode

surface (carried out by the ORBISPHERE 32301).

• Rechloridization of the cathode: A layer of silver chloride is grown on the cathode's surface

(carried out by the ORBISPHERE 32301).

• Activation of the platinum anode: The center anode surface is polished, and treated with nitric acid.

Troubleshooting

Oxygen sensor

Problem Probable cause Possible solution

Sensor won't calibrate, even after

thorough servicing.

Repeated calibrations go beyond

"expected limits" of instrument.

MOCA 3600 only: Select membrane

from "Options/Membrane" menu.

Then, calibrate the sensor.

Instrument internal barometric

pressure sensor needs calibration.

Calibrate internal barometer against

a certified barometer. Do not correct

for sea level !

Wet membrane interface.

Wipe dry with a tissue and re-

calibrate.

"H

2

S insensitivity" option enabled.

Disable on the measuring

instrument.

"0000" O

2

levels displayed.

Wrong reading scale "XXXX"

selected for display unit.

Change reading scale by selecting

"X.XXX, XX.XX or XXX.X".

Shorter than expected sensor

operation in relatively high dissolved

O

2

concentration.

High O

2

concentrations generate

deposits more quickly.

Install a less permeable membrane.

Turn off the analyzer when sensor is

not in a low O

2

concentration.

Unexpected or inaccurate dissolved

O

2

readings.

Air leak on product sample line.

Set flow rate to 100 mL/min. Wait

until stable, then slowly double this

flow rate.

The stable value of dissolved O

2

reading must be the same as

before. A variation related to flow

rate is a clear sign of an air leak in

the line.

High residual current.

Place sensor in de-aerated sample;

wait for low reading:

Check concentration against low

measurement limit (see tables in

Sensor membrane specifications

on page 3). If concentration is

significantly higher than low limit, try

a sensor service.

16 English

Hydrogen sensor

Problem Probable cause Possible solution

Sensor won't calibrate, even after

thorough servicing.

Repeated calibrations go beyond

"expected limits" of instrument.

MOCA 3600 only: Select membrane

from "Options/Membrane" menu.

Then, calibrate the sensor.

"0000" H

2

levels displayed.

Wrong reading scale "XXXX"

selected for display unit.

Change reading scale by selecting

"X.XXX, XX.XX or XXX.X".

Shorter than expected sensor

operation in relatively high H

2

concentration.

High H

2

concentrations require

more work from electrochemical

sensor.

Shut off analyzer when not needed.

Unexpected or inaccurate H

2

readings.

High residual current.

If concentration is significantly

higher than low limit, try a sensor

service.

Ozone sensor

When the O

3

sensor has been properly calibrated using the ORBISPHERE measuring instrument,

the sensor has to settle down for up to 24 hours when used in very low O

3

concentration conditions.

Problem Probable cause Possible solution

Sensor won't calibrate, even after

thorough servicing.

Repeated calibrations go beyond

"expected limits" of instrument.

MOCA 3600 only: Select membrane

from "Options/Membrane" menu.

Then, calibrate the sensor.

Instrument internal barometric

pressure sensor needs calibration.

Calibrate internal barometer against

a certified barometer. Do not correct

for sea level !

Wet membrane interface.

Wipe dry with a tissue and re-

calibrate.

"0000" O

3

levels displayed.

Wrong reading scale "XXXX"

selected for display unit.

Change reading scale by selecting

"X.XXX, XX.XX or XXX.X".

Unexpected or inaccurate dissolved

O

3

readings.

High residual current.

If concentration is significantly

higher than low limit, try a sensor

service.

Insufficient flow rate.

Regulate flow equivalent to

membrane specified levels.

Length of sample line allows O

3

time to react.

Reduce length of sample tubing.

Doesn't match lab samples.

Take samples at close proximity to

sensor.

English 17

Sensorspezifikationen

Die Spezifikationen können ohne Vorankündigung Änderungen unterliegen.

Produktlinie Sensor

Gas

Max. Druck

Belastbarkeit

(bar)

Sensormodelle Kommentare

O

2

20 31 11x.yz wobei:

x=spezielle Eigenschaften des Sensors

(0 oder 1; in Abhängigkeit von der Anwendung)

y=Material des O-Rings der Membran

(0=EDPM; 1=Viton; 2=Kalrez; 4=Nitril)

z=Material des Kopfes

(1=St Stahl; 2=Peek; 4=Hastelloy; 5=Titan; 7= Monel)

Suffixe (wenn verwendet):

A bezeichnet einen Sensor mit schneller Reaktion auf

Temperaturänderungen

E bezeichnet einen Sensor mit EEx-Zertifizierung (Ex-Proof)

s Bezeichnet einen Smart-Sensor

50 31 12x.yz

100 31 13x.yz

200 31 14x.yz

O

3

20 31 31x.yz

100 31 33x.yz

H

2

50 31 21x.yz

100 31 23x.yz

200 31 24x.yz

• Alle Gehäuse der elektrochemischen ORBISPHERE-Sensoren verfügen über die Zertifizierung

IP68 / NEMA4

• PEEK (Polyetheretherketon) ist ein hochgradig kristallisiertes Thermoplast

Spezifikationen der Membran des Sensors

Wasserstoffsensoren

Spezifikation Membran 2956A

Membran

2952A

Membran 2995A

Membran

29015A

Empfohlene Anwendungen Spurenmessung

Niedrige

Konzentration

Durchschnittliche

Konzentration

Hohe

Konzentration

Material PFA Tefzel

®

Tedlar

®

Saran

Stärke [μm] 25 25 12,5 23

Kalibrierungsgas 1% reiner H

2

10% reiner H

2

100% reiner H

2

100% reiner H

2

Messbereich gelöste Gase 0 ppb bis 75 ppb

0 ppb bis

300 ppb

0 ppb bis

3200 ppb

0 ppb bis

32 ppm

Messbereich gasförmige Medien 0 Pa bis 5 kPa 0 Pa bis 20 kPa 0 Pa bis 200 kPa

0 kPa bis

2000 kPa

Genauigkeit

Das größere

Wert von ±1%

der Messung

oder ± 0,03 ppb,

oder ± 1 Pa

Das größere

Wert von ±1%

der Messung

oder ±

0,09 ppb, oder

± 6 Pa

Das größere

Wert von ±1%

der Messung

oder ±1 ppb, oder

± 50 Pa

Das größere

Wert von ±1%

der Messung

oder ±10 ppb,

oder ± 1 kPa

Integrierter

Strahlungsdosisgrenzwert

2 x 10

4

10

8

10

8

N/A

Erwarteter Strom in Luft bei 1 bar

25°C [µA]

N/A

Erwarteter Strom in reinem Gas [µA] 150 50 5 0,5

18 Deutsch

Spezifikation Membran 2956A

Membran

2952A

Membran 2995A

Membran

29015A

Temperaturkompensationsbereich 0 bis 50°C 0 bis 50°C 10 bis 45 °C 10 bis 45 °C

Temperaturmessbereich -5 bis 100 °C

Reaktionszeit

1

2 Sekunden 5 Sekunden 6 Sekunden 50 Sekunden

Empfohlene Mindestflussrate der

Flüssigkeit

2

[mL/min]

50 bis 220 40 bis 200 20 bis 70 20 bis 40

Empfohlene lineare

Mindestflussrate

2

[cm/Sek.]

200 150 50 30

Empfohlene Flussrate des

gasförmigen Mediums [L/min]

0,005 bis 3

Sauerstoffsensoren (Tabelle 1)

Spezifikation

Membran

2956A

Membran

2958A

Membran

29552A

Membran

2952A

Empfohlene Anwendungen

Korrosionskontr

olle, entlüftetes

Wasser

Getränk,

Laboranwendun

gen

Bierwürze in der

Leitung Luft/O

2

-

Einspritzung,

Abwasseraufber

eitung

Korrosionskontr

olle, Getränk in

der Leitung,

entlüftetes

Wasser

Material PFA Tefzel

®

PTFE Tefzel

®

Stärke [μm] 25 12,5 50 25

Kalibrierungsgas Luft Luft Luft Air / reines O

2

Messbereich gelöste Gase

0 ppb bis

20 ppm

0 ppb bis

40 ppm

0 ppb bis

80 ppm

0 ppb bis

80 ppm

Messbereich gasförmige Medien 0 Pa bis 50 kPa

0 Pa bis

100 kPa

0 Pa bis

200 kPa

0 Pa bis

200 kPa

Genauigkeit

Das größere

Wert von ±1%

der Messung

oder ±

0,1 ppb

(1)

, oder

± 1 ppb

(2)

, oder

± 0,25 Pa

Das größere

Wert von ±1%

der Messung

oder ±1 ppb,

oder ± 2 Pa

Das größere

Wert von ±2%

der Messung

oder ±1 ppb,

oder ± 5 Pa

Das größere

Wert von ±2%

der Messung

oder ±1 ppb,

oder ± 5 Pa

(1)

Die Genauigkeit beträgt ± 0,1 ppb für die Instrumente 410, 510,

362x, 360x und 3655.

(2)

Die Genauigkeit beträgt ± 1 ppb für die Instrumente 366x und 3650.

Integrierter Strahlungsdosisgrenzwert 2 x 10

4

10

8

N/A 10

8

Erwarteter Strom in Luft bei 1 bar 25°C

[µA]

26,4 9,4 6,3 5,4

Erwarteter Strom in reinem O

2

[µA] 132 47 31,4 27

O

2

-Verbrauch in O

2

-gesättigtem

Wasser bei 25 °C [µg/Stunde]

40 14 9,4 8

Temperaturkompensationsbereich -5 bis 60 °C

1

Reaktionszeit bei 25 °C für eine Signaländerung von 90%

2

Fluss der Flüssigkeit durch eine Flusskammer ORBISPHERE 32001, mit Schutzkappe und

ohne Gitter

Deutsch 19

Spezifikation

Membran

2956A

Membran

2958A

Membran

29552A

Membran

2952A

Temperaturmessbereich -5 bis 100 °C

Reaktionszeit

3

7,2 Sekunden 9,5 Sekunden 90 Sekunden 38 Sekunden

Empfohlene Mindestflussrate der

Flüssigkeit

4

[mL/min]

180 120 50 50

Empfohlene lineare Mindestflussrate

4

[cm/Sek.]

200 100 30 30

Empfohlene Flussrate des gasförmigen

Mediums [L/min]

0,1 bis 3

Sauerstoffsensoren (Tabelle 2)

Spezifikation Membran 2935A Membran 29521A Membran 2995A

Empfohlene Anwendungen

Gesättigte bis

übersättigte Pegel

Gesättigte bis

übersättigte Pegel

Heiße Bierwürze in

der Leitung (bis zu

70°C)

Material Halar

®

Tefzel

®

Tedlar

®

Stärke [μm] 25 125 12,5

Kalibrierungsgas Air / reines O

2

Air / reines O

2

Reines O

2

Messbereich gelöste Gase 0 ppb bis 400 ppm 0 ppb bis 400 ppm 0 ppb bis 2.000 ppm

Messbereich gasförmige Medien 0 Pa bis 1000 kPa 0 Pa bis 1000 kPa 0 Pa bis 5.000 kPa

Genauigkeit

Das größere Wert von

±1% der Messung

oder ±10 ppb, oder ±

20 Pa

Das größere Wert von

±1% der Messung

oder ±10 ppb, oder ±

20 Pa

Das größere Wert von

±1% der Messung

oder ±50 ppb, oder ±

100 Pa

Integrierter Strahlungsdosisgrenzwert N/A 10

8

10

8

Erwarteter Strom in Luft bei 1 bar

25°C [µA]

0,9 0,7 0,2

Erwarteter Strom in reinem O

2

[µA] 4,7 3,8 0,9

O

2

-Verbrauch in O

2

-gesättigtem

Wasser bei 25 °C [µg/Stunde]

1,4 1,3 0,3

Temperaturkompensationsbereich -5 bis 60 °C

Temperaturmessbereich -5 bis 100 °C

Reaktionszeit

5

2,5 Minuten 18 Minuten 80 Sekunden

Empfohlene Mindestflussrate der

Flüssigkeit

6

[mL/min]

25 25 5

3

Reaktionszeit bei 25 °C für eine Signaländerung von 90%

4

Fluss der Flüssigkeit durch eine Flusskammer ORBISPHERE 32001, mit Schutzkappe und

ohne Gitter

5

Reaktionszeit bei 25 °C für eine Signaländerung von 90%

6

Fluss der Flüssigkeit durch eine Flusskammer ORBISPHERE 32001, mit Schutzkappe und

ohne Gitter

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