ProMinent DULCOMETER D1C Manuel utilisateur

Operating Instructions

DULCOMETER®D1C

Part 3: Adjustment and Operation,

Measured Variable H2O2for PEROX Sensor

ProMinent®

Part No. 987936 ProMinent Dosiertechnik GmbH ·D-69123 Heidelberg ·Germany BA DM 171 12/08 GB

Please first read the operating instructions completely! ·Do not discard!

The operator shall be liable for any damage caused

by installation or operating errors!

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Page

1 General User Information .................................................................................................................... 2

2 Measuring Principle ............................................................................................................................ 3

2.1 Applications ............................................................................................................................... 3

3 Operating Conditions .......................................................................................................................... 4

4 Set-Up of the Complete Measuring System ....................................................................................... 5

4.1 Set-Up Examples ....................................................................................................................... 5

5 Installation ........................................................................................................................................... 6

5.1 Mechanical Installation ............................................................................................................. 6

5.2 Installation in the Bypass Fitting ................................................................................................ 6

5.3 Electrical Installation .................................................................................................................. 6

5.4 Setting of the Measuring Range ................................................................................................ 7

6 Commissioning ................................................................................................................................... 8

6.1 Functional Test ........................................................................................................................... 8

6.2 Run-In Phase ............................................................................................................................. 8

6.3 Calibration with Photometer Type DT3 ...................................................................................... 8

6.4 Calibration with Buffer Solution in the Bypass Fitting Type DLG ............................................... 8

6.5 Calibration Intervals ................................................................................................................... 9

7 Operation ............................................................................................................................................ 9

7.1 Maintenance .............................................................................................................................. 9

7.2 Diaphragm Replacement ........................................................................................................... 9

7.3 Polishing the Electrode Surface ................................................................................................. 10

8 Spare Parts and Consumables ........................................................................................................... 11

1 General User Information

General Instructions for the User

These operating instructions describe the technical data and functions of the DULCOTEST®PEROX V1

sensor signal transmitter PEROX V1 and the accessory devices. These descriptions contain detailed safety

instructions and are sectioned clearly according to the sequence of action steps.

IMPORTANT

• The instrument must always be in an electrically dead state (disconnected from the mains

voltage) while connecting measuring sensors and/or accessory devices!

• Please note which parts of this manual are relevant for your particular version of the

instrument. You can determine this from the equipment designation and identification

code.

• Correct measuring and metering is possible only when the measuring sensors are functioning

correctly. The sensor must therefore be checked and recalibrated regularly.

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2 Measuring Principle

Measuring Principle

The PEROX measuring system is based on amperometric measurements with some special features not

found in conventional systems. The small surface area measuring electrode is made of platinum (for

hydrogen peroxide measurements) and is covered with a microporous diaphragm cap to make the readings

largely independent of the liquid flow conditions. The entire stainless steel shaft of the PEROX sensor acts

as counter-electrode. The sensor part of the H2O2measurement is thus complete.

All amperometric measurements depend strongly on the temperature, therefore we recommend temperature

compensation using a PT100 resistance thermometer sensor, if temperature fluctuations occur in your

application.

2.1 Applications

The environmentally compatible substance hydrogen peroxide (H2O2) is increasingly being used in process

engineering as oxidising and reducing agent. Some examples of specific applications for continuous

PEROX-H2O2measurements and loop control functions are:

- Gas scrubbers, e.g. in municipal and industrial sewage treatment plant

- Ground water purification

- Drinking water oxidation

- Process water / cooling water disinfection

- Chlorine removal, e.g. in chemical processes

- Seepage water treatment in refuse dumps

- Bio-engineering

- Vat dyeing / textiles

- Swimming pool water disinfection

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Operating Conditions

H2O2

Measuring ranges: 1 ... 20 mg/l

10 ... 200 mg/l

100 ... 2000 mg/l

2-electrode technology

pH operating range: pH 2.5 ... 10

Temperature range: 0 ... 40 °C

Temperature compensation: manually or automatically, depending on Identcode specification

Permissible temperature change rate: < 0.5 K/min

Minimum conductivity of the

sample solution up to: 20 mg/l: 50 μS/cm

200 mg/l: 200 μS/cm

1,000 mg/l: 500 μS/cm

2,000 mg/l: 1 mS/cm

Max. operating pressure of the sensor: 6 bar, without pressure peaks

Response rate of sensor, T90 : approx. 20 seconds

Sample water flow rate: 30 ... 100 l/h

Reproducibility: Better than 2 % of the measuring range end value

Cross-sensitivity: negligible cross-sensitivity to free chlorine

Interfering factors: Tensides can impair the measurements. Solid material may clog

the diaphragm; pre-filter if necessary.

3 Operating Conditions

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4.1 Set-Up Examples

H2O2measuring system in wall-mounted set-up, with automatic temperature correction and flow rate

monitoring:

(1) DULCOMETER®D1C controller

Measured variable PES/PAA

(2) Continuous flow measuring sensor with monitoring facility

(3) PT100; for long-distance signal transmission,

temperature signal transmitter screwed onto the PT100

(4) H2O2sensor type PEROX

(4a) Transmitter type PEROX V1

(5) DGMA 320T000

4 Set-Up of the Complete Measuring System

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5 Installation

5.1 Mechanical Installation

IMPORTANT

• When installing the equipment, make quite sure that it is disconnected from the mains

voltage!

• Interpose a filter in the input feed line if the liquid to be measured is turbid or dirty!

• Install a continuous flow sample cooler if the sample temperature is high or subject to

large or rapid fluctuations!

The PEROX sensor is delivered with a protecting cap to protect the diaphragm and the electrode surface.

Storage and transport take place in the dry state. The electrode must be polished before utilisation for the

first time, in order to bring the electrode surface into a condition suitable for making measurements (see

chap. 7.3 ‘Polishing the electrode surface’). Before installation, the diaphragm cap is to be filled with water

and screwed onto the sensor hand-tight (no air bubbles).

5.2 Installation in the Bypass Fitting

Like the other sensors, the PEROX sensor is installed hand-tight and leak-tight in the fitting using a socket

wrench SW17. Then manually screw the transmitter(s) onto the sensor(s). The power supply voltage must

be in the switched-off state at the D1C while installing the signal transmitters.

After the installation of the sensors, the fitting must always be filled with liquid (if possible sample liquid)

because all sensors with the exception of PT100 are to be protected against drying out.

5.3 Electrical Installation

See also electrical installation and connecting terminal diagram in the operating instructions DULCOMETER®

D1C, Part 1, Assembly and Installation for Wall-Mounted and Panel-Mounted Systems:

- Terminal block X2, terminal 9 of the D1CA controller is connected with terminal 1 of the transducer

PEROX V1

- Terminal block X2, terminal 10 of the D1CA controller is connected with terminal block X1, terminal 2 of

the transducer PEROX V1 (see fig.)

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Installation

Hydrogen peroxide (H2O2)

Switch position S1 Measuring range [ppm]

off

2000

off

200

on (as delivered)

off

not defined

5.4 Setting of the Measuring Range

The measuring ranges 20/200/2,000 ppm are set via the DIP switch S1 at the transducer PEROX V1.

The measuring range is factory-set to 0-200 ppm.

The other measuring ranges can be set via the DIP switch positions listed in the table.

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6 Commissioning

SAFETY INSTRUCTIONS

Disconnect the power supply voltage every time before mounting/removing sensors, signal

transmitters and other components.

The PEROX signal transmitter must not be disconnected from the PEROX sensor during

operation.

For the sequence of operating steps on the D1C-controller (settings, calibration, etc.), please consult the

“Operating Instructions DULCOMETER®D1C, Part 2, Measured Variable H2O2and Peracetic Acid (PAA).

6.1 Functional Test

Before calibrating the measuring system, make a visual inspection of all electrical connections, and check

that the hydraulic connections are not leaking.

If required, the function of the transducer PEROX V1 can be tested separately.

The test is made at the SN6 socket of the transducer. The following DC voltage Udes must be measured with

the multimeter between the outer and inner contact area:

Udes : 750 ±20 mV

A short-term change in the indicated value is normal.

6.2 Run-In Phase

Elapse of a run-in phase of at least one hour must be awaited to avoid drift of the sensor signal. Calibrate

the measuring system again after 24 hours.

6.3 Calibration with Photometer Type DT3

Preferably, calibration with the help of the photometer kit DT3 (1023143) is recommended.

6.4 Calibration with Buffer Solution in the Bypass Fitting Type DLG

After the run-in phase, the sensor must be calibrated according to the calibration menu of the D1C (PEROX)

(see also Operating Instructions DULCOMETER®D1C, Part 2, Measured Variable H2O2and Peracetic Acid

(PAA)). Always make a two-point calibration when commencing operation for the first time. A single-point

calibration with buffer 2 suffices for the recalibrations at routine intervals.

Choose the two calibration points such that the solution 1 (buffer 1) contains no H2O2(zero point solution)

and the solution 2 (buffer 2) corresponds to the concentration expected when making measurements

subsequently. As far as possible, use solutions on the basis of the original process water for calibrating the

sensor. If the process water contains components which consume H2O2, replace the process water with tap

water.

For calibration, the process water input feed line must be shut off and the measuring system must first be

emptied, to avoid any mixing of calibration solution and process water.

- Switch to the calibration menu according to “Operating Instructions DULCOMETER®D1C, Part 2, Measured

Variable H2O2and Peracetic Acid (PAA)”.

- Close the shut-off valves

- Empty the process water out of the measuring system

- Empty the cup of the DLG and then fill it with calibrating solution

- Screw the cup back into the DLG

- Switch-on the magnetic stirrer to feed liquid to the sensor.

- Proceed according to the calibration menu “Operating Instructions DULCOMETER®D1C, Part 2, Measured

Variable H2O2and Peracetic Acid (PAA)”.

- When changing the calibrating solutions, rinse the cup and the probe thoroughly with “buffer 2”, empty the

cup and then fill it with buffer 2.

- Continue according to the calibration menu “Operating Instructions DULCOMETER®D1C, Part 2, Measured

Variable H2O2and Peracetic Acid (PAA)”.

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6.5 Calibration Intervals

The proper calibration intervals depend strongly on the process conditions and the substances actually

present in the process water, therefore no generally valid specifications can be given. Under laboratory

conditions (pure aqueous solutions of H2O2), the calibrations intervals are about 3 months. To determine the

optimum calibration intervals under process conditions, determine the H2O2concentrations by indepen-

dent methods (e.g. DT3) at regular intervals (e.g. initially daily).

For definite results, the sample-taking point must lie in the immediate vicinity of the sensor. If this condition

is not fulfilled, there may be considerable discrepancies between the sensor reading and the externally

determined H2O2content of the sample.

7 Operation

Operation

IMPORTANT

The PEROX system should always be left switched-on, even when the process which is

monitored/controlled is temporarily shut-down (e.g. over a weekend). Otherwise the sensor

would lose its proper surface condition which is important for making measurements. When

switching-on again after switch-off, the sensor is ready again for making measurements only

after elapse of a run-in time. The measuring cup of the DLG or DGM must always be kept

filled with process water or tap water.

7.1 Maintenance

It is advisable to make a regular visual check of the sensor condition, in particular the diaphragm. If the

diaphragm is contaminated with dirt, replace the complete diaphragm cap.

If the electrode surface is dull, polish the electrode and replace the diaphragm cap.

7.2 Diaphragm Replacement

- Disconnect the PEROX system from the mains voltage.

- Close the shut-off valves.

- Unscrew the transmitter from the sensor.

- Screw-out the PEROX sensor from the DLG/DGM.

- Unscrew and detach the diaphragm cap.

Hereby check the condition of the electrode surface. If the platinum electrode appears dull or modified,

polish it (see chap. 7.3 “Polishing the Electrode Surface”).

- Fill new diaphragm caps completely with tap water.

- Screw the sensor hand-tight into the diaphragm cap. This displaces excess water. Make sure that there

are no air bubbles trapped between the diaphragm and the electrode.

- The diaphragm should be slightly convex with respect to the exterior.

- Screw the sensor leakproof into the DLG/DGM filled with water or process water (SW17 wrench). Screw-

on the signal transmitter (SW22 wrench). Establish the signal connection to the D1C.

- Open the shut-off valves.

- Switch-on the mains voltage.

- Recalibrate

When replacing the diaphragm without polishing the electrode, the sensor requires no run-in period; this

facilitates the calibration after stabilisation of the measuring signal. After polishing and diaphragm

replacement, we recommend a 2-point calibration (buffer 1 and 2), whereas a regular slope correction

(buffer 2 only) suffices in routine operation.

Commissioning / 7 Operation

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7.3 Polishing the Electrode Surface

- Put a pea-size amount of polishing paste onto a soft (paper) rag.

- Press the electrode into the polishing paste and turn it under gentle pressure.

- Completely remove the polishing paste from the electrode and sensor shaft by rinsing under lukewarm

running water.

- The surface of the platinum electrode must have a metallic gloss again. If not, repeat the polishing process.

- Do not touch the electrode surface again. Contamination with skin grease or sweat would impair the

sensor function.

For further procedure steps, see chap. 7.2 “Diaphragm Replacement”.

After polishing the electrode, the surface must be brought again into the condition required for making

measurements. This requires a run-in time of at least 1 hour. Calibration can be carried out thereafter.

Repeat the calibration after 24 hours.

Operation

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