Xylem WTW SenTix ORP-T 900 Bedienungsanleitung

OPERATION MANUAL

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SenTix®ORP-T 900(-P)

ORP ELECTRODE

SenTix®ORP-T 900(-P)

OPERATING MANUAL

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SenTix®ORP-T 900

Printed in Germany.

SenTix®ORP-T 900(-P) General information

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1 General information

Automatic sensor

recognition

The sensor electronics with the stored sensor data are in the connecting

head of the electrode. The data include, among other things, the sensor type

and series number. The data are recalled by the meter when the sensor is

connected and are used for measurement and for measured value documen-

tation.

Storing the calibration data in the sensor ensures that the correct slope and

asymmetry are automatically used if the sensor is operated with different

meters. On the other hand, different calibrated sensors can be used with one

meter without being recalibrated.

The digital transmission technique guarantees the failure-free communica-

tion with the meter even with long connection cables. The sensor firmware

can be updated via the meter.

Commissioning, measuring, checking SenTix®ORP-T 900(-P)

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2 Commissioning, measuring, checking

2.1 Opening and closing the IDS plug connection

This section only applies to variants with IDS plug (SenTix®... -P).

Opening the plug

connection

If necessary, clean the plug connection

Open the locking device (step 1)

Use your thumb and index finger to press the clips of the connector togeth-

er, and pull the connector out of the plug (step 2).

Closing the plug

connection

Make sure that the plug connection is perfectly dry and clean.

Align the guidance of the coupling to the groove in the plug and insert the

coupling into the unlocked plug up to the stop (step 3)

Close the locking device (step 4)

Plug connection

closed and locked

Guidance

Groove

SenTix®ORP-T 900(-P) Commissioning, measuring, checking

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2.2 Commissioning

Scope of delivery Electrode SenTix®ORP-T 900(-P)

Operating manual

Commissioning Prepare the electrode for measuring as follows:

Open the refilling opening for the reference electrolyte solution. Depend-

ing on the model, the stopper of the refilling opening is an elastomer stop-

per or a slider.

The refilling opening must always be open during measurement!

Remove the watering cap from the electrode tip. Possible salt deposits in

the area of the watering cap do not affect the measuring characteristics

and can easily be removed with deionized water.

Connect the sensor to the meter.

The sensor is immediately ready to measure.

Please keep the watering cap. It is required for the electrode to

be stored. Always keep the watering cap clean.

SenTix®ORP-T 900 – via the sensor cable to a free IDS connec-

tor on the meter

SenTix®ORP-T 900-P – via a connecting cable (accessory) to a

free IDS connector on the meter

– wireless via an IDS WLM-S adapter

(accessory) to a WLM-capable meter

Accessories for the connection of the

SenTix®ORP-T 900-P sensor to the meter:

See chapter 7 WEAR PARTS AND ACCESSO-

RIES.

Opening and closing the IDS plug connection,

see section 2.1OPENING AND CLOSING THE IDS

PLUG CONNECTION.

Refilling

opening

Commissioning, measuring, checking SenTix®ORP-T 900(-P)

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Measure with the electrode according to the operating manual of the meter

and observe the following rules while doing so:

2.3 Measuring: General rules

Make sure the refilling opening for the reference electrolyte solution is

open.

Avoid the carryover of sample solution from one measurement to the next

as follows:

– Shortly rinse the sample beakers with the solution the beakers are to

be filled with next.

– Between measurements, rinse the electrode with the solution that fol-

lows. Alternatively, you can also rinse the electrode with deionized

water and then carefully dab it dry.

Immerse the electrode in the solution in a vertical or slightly tilted position.

Make sure the immersion depth is correct. The junction must be com-

pletely submersed in the solution. The junction is in the area of the bottom

end of the shaft (see arrow).

At the same time, the level of the reference electrolyte must be at least 2

cm above the level of the solution.

Conversion to nor-

mal hydrogen elec-

trode

UH= UMeas + URef

SenTix®ORP-T 900(-P)

with: UH= ORP, referring to the normal hydrogen electrode

UMeas = Measured ORP

URef = Voltage of the reference system compared to the normal

hydrogen electrode

SenTix®ORP-T 900(-P) Storage

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URef is temperature dependent and can be taken from the following table (see

also DIN 38404-6):

3Storage

During short mea-

suring breaks

Immerse the electrode in the reference electrolyte with the refilling opening

open.

Prior to the next measurement, shortly rinse the electrode with the test

sample or deionized water.

Overnight or lon-

ger

Insert the clean electrode into the watering cap filled with reference electro-

lyte and shut the refilling opening.

4 Aging

ORP electrodes are consumables. Every ORP electrode undergoes a natural

aging process. Extreme operating conditions can considerably shorten the

lifetime of the electrode. These are:

Strong acids or lyes, hydrofluoric acid, organic solvents, oils, fats, bro-

mides, sulfides, iodides, proteins

High temperatures

T (°C) URef [mV] T (°C) URef [mV]

SenTix®ORP-T 900 SenTix®ORP-T 900

0 +224 35 +200

5 +221 40 +196

10 +217 45 +192

15 +214 50 +188

20 +211 55 +184

25 +207 60 +180

30 +203

electrode Reference electrolyte Model

(see page 10)

SenTix®ORP-T 900(-P) 3 mol/l KCl, Ag+free KCl-250 (250 ml)

During longer storing periods, salt sediments may develop on the

watering cap. They do not affect the measuring characteristics

and can easily be removed with deionized water when the elec-

trode is put into operation again.

Maintenance and cleaning SenTix®ORP-T 900(-P)

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High changes in pH and temperature.

The warranty does not cover failure caused by measuring conditions and

mechanical damage.

5 Maintenance and cleaning

During operation, a small amount of reference electrolyte leaks through the

junction from the electrode into the test sample. If the level of reference elec-

trolyte becomes too low with time, refill it through the refilling opening.

Refilling the refer-

ence electrolyte

Refilling is very easy using a dropping bottle. Proceed as follows:

Cut off the tip of the dropping bottle at a right angle until the opening in the

tip can be seen

Open the refilling opening of the electrode

Press the tip of the dropping bottle into the refilling opening while turning

it slightly

Pump several small quantities of the reference electrolyte into the stem

using the dropper bottle

Pull the dropping bottle out of the refilling opening while turning it slightly

as necessary.

Cleaning Remove water-soluble contamination by rinsing with deionized water.

Remove other contamination as follows:

Contamination Cleaning procedure

Fat and oil Rinse with water containing household washing-up

liquid

Lime and hydroxide

deposits

Rinse with citric acid (10 % by weight)

SenTix®ORP-T 900(-P) Technical data

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After cleaning Rinse the electrode with deionized water.

6 Technical data

Protein Immerse in pepsin cleaning solution PEP/pH for

approx. 1 hour.

Note: Make sure the level of the reference electro-

lyte is above that of the cleaning solution.

Contamination Cleaning procedure

Measurement and

application char-

acteristics

mV measuring range - 1250.0 ... + 1250.0

Allowed temperature range 0 ... 100 °C (32 ... 212 °F)

Typical application Laboratory

Accuracy of the

IDS measuring

technique

Measured parameter Accuracy (± 1 digit)

U [mV] ± 0.2

T [°C] ± 0.1

General data Reference electrolyte 3 mol/l KCl, Ag+free

Junction Ceramic

Electrode material and shape Platinum / circle

Connection cable Lengths SenTix®ORP-T 900: 1.5 m

SenTix®ORP-T 900-P:

1.5 / 3 / 6 / 10 / 15 / 25 / 40 / 60 / 100 m

Diameter 4.3 mm

Smallest allowed

bend radius

Fixed installation:20 mm

Flexible use:60 mm

Plug type Socket, 4 -Ppoles

Shaft dimensions,

material

Shaft length 120 mm

Shaft diameter 12 mm

Shaft material Glass

IDS plug Plastic parts: Glass fiber reinforced

Noryl, TPU, TPC-ET, POM, PVC,

PEEK, PBT

O-ring: FPM

Contacts gold-plated

Wear parts and accessories SenTix®ORP-T 900(-P)

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7 Wear parts and accessories

IDS plug Connection type 4-P-pin, watertight plug connection with

locking device, reverse polarity protected

Storage With watering cap; filled with KCl 3 mol/L, Ag+free

Maintenance

equipment

Description Model Order no.

Reference electrolyte solution 250 ml

to fill the watering cap

(KCl 3 mol/l, Ag+-free)

KCl-250 109 705

-PORP buffer solution for checking ORP

electrodes

UH= 427 mV,

bottle of 250 ml

RH 28 109 740

Pepsin cleaning solution,

3 bottles of 250 ml each

PEP/pH 109 648

Connection cable

SenTix®ORP-

T 900(-P) - meter

Description Model Order no.

IDS connecting cable, 1.5 m AS/IDS-1.5 903 850

IDS connecting cable, 3 m AS/IDS-3 903 851

IDS connecting cable, 6 m AS/IDS-6 903 852

IDS connecting cable, 10 m AS/IDS-10 903 853

IDS connecting cable, 15 m AS/IDS-15 903 854

IDS connecting cable, 20 m AS/IDS-20 903 855

IDS connecting cable, 25 m AS/IDS-25 903 856

IDS connecting cable, 40 m AS/IDS-40 903 857

IDS connecting cable, 60 m AS/IDS-60 903 858

IDS connecting cable, 100 m AS/IDS-100 903 859

Radio connection

SenTix®ORP-

T 900(-P) - meter

Description Model Order no.

WLM capable IDS meter

+ radio module for IDS meter

see Internet

Radio module for plug head sensor IDS WLM-S 108 141

Andere Handbücher für WTW SenTix ORP-T 900

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