Xylem WTW SenTix 950 Bedienungsanleitung

OPERATING MANUAL

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SenTix®950 / 980 /

Micro 900(-P)

pH ELECTRODE WITH LIQUID ELECTROLYTE

SenTix®950(-P)

SenTix®980(-P)

SenTix®Micro 900(-P)

OPERATING MANUAL

SenTix®950 / 980 / Micro 900(-P)

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Printed in Germany.

SenTix®950 / 980 / Micro 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. In addition, the calibration data are stored in the sensor

with each calibration and the calibration history is recorded (the last 10 cali-

brations). The data is recalled by the meter when the sensor is connected

and is used for measurement and for measured value documentation.

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 the need to recalibrate.

The digital transmission technique guarantees the failure-free communica-

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

is enhanced by WTW, it can be updated via the meter.

General information SenTix®950 / 980 / Micro 900(-P)

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2 Commissioning, measuring, calibration

2.1 Opening and closing the IDS plug connection

This section only applies to IDS plug variants (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

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

Closing the plug

connection

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

Align the guidance of the connector with the groove in the plug and insert

the connector in the unlocked plug until it catches (step 3).

Close the locking device (step 4).

Plug connection

closed and locked

Guidance

Groove

SenTix®950 / 980 / Micro 900(-P) General information

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2.2 Commissioning

Scope of delivery Electrode SenTix®950 / 980 / Micro 900(-P)

Operating manual

Commissioning The electrode is filled with reference electrolyte solution in the factory. Pre-

pare 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 calibration and

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.

SenTix®950(-P): Remove any gas bubbles behind the pH membrane by

shaking.

Connect the electrode to the meter.

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

be stored. Always keep the watering cap clean.

SenTix®950 / 980 /

Micro 900

– via the sensor cable to a free IDS connec-

tor on the meter

SenTix®950 / 980 /

Micro 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

Refilling

opening

Refilling

opening

General information SenTix®950 / 980 / Micro 900(-P)

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Calibrate the electrode according to the operating manual of the meter

and observe the following rules while doing so:

2.3 Calibration and measurement: General rules

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

open.

Avoid the carryover of any solution (sample or buffer solution) from one

measurement to the next by taking the following measures:

– Shortly rinse the calibration and 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 figure). At the same time, the level of the reference

electrolyte in the electrode must be at least 2 cm above the level of the

solution.

Provide approximately the same stirring conditions for measuring as for

calibrating.

Accessories for the connection of the

SenTix®980-P sensor to the meter: See

chapter 7 WEAR PARTS AND ACCESSORIES.

Opening and closing the IDS plug connection,

see section 2.1 OPENING AND CLOSING THE

IDS PLUG CONNECTION.

Prevent contact of the pH membrane to the beaker bottom to

avoid scratches on the pH membrane.

Junction

Reference electrolyte

(Example)

Glass membrane

Shaft

SenTix®950 / 980 / Micro 900(-P) Storage

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Subsequent

calibrations

The frequency of subsequent calibrations depends on the application. The

meters provide an option where you can enter a calibration interval. After the

calibration interval has expired, the meter will automatically remind you of the

due calibration.

3Storage

During short

measuring breaks

With the refilling opening open, immerse the electrode in reference electro-

lyte (KCl 3 mol/l, Ag+free). Prior to the next measurement, shortly rinse the

electrode with the test sample or deionized water.

Overnight or

longer

Put the clean electrode in the watering cap that is filled with reference elec-

trolyte (KCl 3 mol/l, Ag+free) and close the refilling opening.

NOTE

pH electrodes must not be stored dry or in deionized water. The elec-

trode could be permanently damaged by this. If the liquid in the

watering cap has dried up, condition the electrode in reference electro-

lyte (KCl 3 mol/l, Ag+ free) for at least 24 hours.

4 Aging

pH electrodes are consumables. Every pH electrode undergoes a natural

aging process. With aging, the responding behavior becomes slower and the

electrode slope and asymmetry change. Moreover, extreme operating condi-

tions 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

High changes in pH and temperature.

The warranty does not cover failure caused by measuring conditions and

mechanical damage.

Prevent contact of the pH membrane to the beaker bottom to

avoid scratches on the pH membrane.

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®950 / 980 / Micro 900(-P)

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5 Maintenance and cleaning

Refilling the

reference

electrolyte

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. Refill-

ing is very easy with the enclosed 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 the reference electrolyte in the shaft using the dropping 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:

NOTE

Hydrofluoric acid, hot phosphoric acid and strong alkaline solutions

destroy the glass membrane.

Contamination Cleaning procedure

Fat and oil Rinse with water containing household wash-

ing-up liquid

Lime and hydroxide deposits Rinse with citric acid (10 % by weight)

Proteins Immerse in pepsin cleaning solution PEP/pH

for approx. 1 hour.

Note: Make sure the level of the reference

electrolyte is above that of the cleaning solu-

tion.

SenTix®950 / 980 / Micro 900(-P) Technical data

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After cleaning Rinse the electrode with deionized water and condition it in reference elec-

trolyte solution for at least 1 hour. Then recalibrate the electrode.

6 Technical data

Measurement pH measuring range 0.000 ... 14.000

Allowed temperature range

(°C)

0 ... 80 °C (SenTix®950(-P))

0 ... 100 °C (SenTix®980 / Micro 900(-P))

Allowed temperature range

(°F)

32 ... 176 °F (SenTix®950(-P))

32 ... 212 °F (SenTix®980 / Micro 900(-P))

Accuracy of the

IDS measuring

technique

Measured parameter Accuracy (± 1 digit)

pH ± 0.004

U [mV] ± 0.2

T [°C] ± 0.1

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

Junction Ceramic (SenTix®950(-P))

Platinum (SenTix®980 / Micro 900(-P))

Temperature sensor Integrated NTC 30

(30 kat 25 °C / 77 °F)

Connection cable Lengths SenTix®950 / 980 / Micro 900: 1,5

SenTix®950 / 980 / Micro 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 pins

Shaft dimensions,

material

Shaft length 120 mm (SenTix®950 / 980(-P))

65/130 mm (SenTix®Micro 900(-P))

Shaft diameter 12 mm (SenTix®950 / 980(-P))

12/5 mm (SenTix®Micro 900(-P))

Shaft material Polyamide (SenTix®950(-P))

Glass (SenTix®980(-P),

SenTix®Micro 900(-P))

Wear parts and accessories SenTix®950 / 980 / Micro 900(-P)

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7 Wear parts and accessories

IDS plug Synthetic materials: Glass fiber reinforced

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

PBT

O-ring: FPM

Contacts gold-Plated

IDS plug Connection type 4-Pole, watertight plug connection with lock,

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

Pepsin cleaning solution 3 x 250 ml PEP/pH 109 648

Connection cable

SenTix®950 / 980 /

Micro 900(-P) -

meter

Description Model Order no.

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

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

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

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

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

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

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

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

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

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

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

Radio connection

SenTix®950 / 980 /

Micro 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

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