Xylem WTW SenTix HW-T 900 Bedienungsanleitung

OPERATING MANUAL

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SenTix®HW-T 900(-P)

pH ELECTRODE WITH LIQUID REFERENCE SYSTEM AND GROUND JUNCTION

OPERATING MANUAL

SenTix®HW-T 900(-P)

2ba77090e03 06/2021

Printed in Germany.

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

ba77090e03 06/2021

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

calibrations). 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

communication with the meter even with long connection cables. The sensor

firmware can be updated via the meter.

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

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2.2 Commissioning

Scope of delivery Electrode SenTix®HW-T 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.

Connect the electrode to the meter

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

When doing so, observe the general rules on the following page.

Ground junction of

SenTix®HW-

T 900(-P)

With the ground junction of the SenTix®HW-T 900 (-P) electrodes, the elec-

trode outflow can be adjusted with a thread:

Hold the electrode with the pH glass membrane pointing downward. Using

the provided special wrench, open the ground junction until some electro-

lyte solution can be seen to come out of the junction and all ground sur-

During longer storing periods, salt sediments may develop on the

watering cap and the refilling opening. The salt sediments do not

affect the measuring characteristics.

Remove any salt sediments with deionized water.

Refill the reference electrolyte solution when the filling level is

low (see chapter section 5 MAINTENANCE AND CLEANING).

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

be stored. Always keep the watering cap clean.

Refilling

opening

Refilling

opening

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

6ba77090e03 06/2021

faces are completely moist.

Carefully and using little power close the junction until the contact between

the rough ground surfaces can be noticed as a resistance. The electrode

is now ready to measure.

NOTE

Caution: Always use very little power to close the junction so the

ground surfaces are not damaged!

The ground junction can be opened further so that more electrolyte solu-

tion comes out.

Preparing the

sensor for

measurement

2.3 Calibration and measurement: General rules

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

open.

Avoid the displacement 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

Specialwrench

Ground junction

OpenClose

SenTix®HW-T 900 Connect the sensor to the meter.

The sensor is immediately ready to measure.

SenTix®HW-T 900-P Connect the sensor to a free IDS sensor plug-in

position of the multi parameter probe or to an IDS

connection of the meter. To open and close the

IDS plug-in position please note the section 2.1

OPENING AND CLOSING THE IDS PLUG CONNECTION.

The sensor is immediately ready to measure.

Connection cables in different lengths to connect

the SenTix®HW-T 900-P sensor to the meter are

listed in chapter 7 WEAR PARTS AND ACCESSORIES.

Connect the sensor to the meter.

The sensor is immediately ready to measure.

SenTix®HW-T 900(-P) Storage

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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 ground junction must be

completely submersed in the solution. At the same time, the level of the

reference electrolyte must be at least 2 cm above the level of the solution.

Provide approximately the same stirring conditions for measuring as for

calibrating.

Subsequent

calibrations

The frequency of subsequent calibrations depends on the application. Many

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

electrolyte (KCl 3 mol/L, Ag+ free). Observe the minimum depth of

immersion. 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

electrolyte (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.

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 and the refilling opening. The salt sediments do not

affect the measuring characteristics.

Remove any salt sediments with deionized water.

Refill the reference electrolyte solution when the filling level is

low (see chapter section 5 MAINTENANCE AND CLEANING).

Aging SenTix®HW-T 900(-P)

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4Aging

pH electrodes are consumables. Every pH electrode undergoes a natural

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

slower and the electrode slope and asymmetry change. Moreover, extreme

operating conditions can considerably shorten the lifetime of the electrode.

Extreme operating

conditions

NOTE

pH electrodes must not be operated under extreme operating condi-

tions. The electrode could be permanently damaged by this.

Examples for extreme operating conditions:

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.

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

if necessary.

SenTix®HW-T 900(-P) Technical data

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

Remove other contamination as follows:

If you want to clean and rinse the ground junction, you can open it as follows:

completely unscrew the ground stopper (see figure on page 5).

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

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

6 Technical data

Contamination Cleaning procedure

Fat and oil Rinse with water containing household

washing-up liquid

Lime and hydroxide depos-

its

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.

Hydrofluoric acid, hot phosphoric acid and strong alkaline

solutions destroy the glass membrane.

Measurement pH measuring range 0.000 ... 14.000

Allowed temperature range 0 ... 60 °C

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

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7 Wear parts and accessories

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 Ground

Temperature sensor Integrated NTC 30

(30 kat 25 °C / 77 °F)

Connection cable Lengths SenTix®HW-T 900: 1,5

SenTix®HW-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 pins

Shaft dimensions,

material

Shaft length 170 mm

Shaft diameter 12 mm

Shaft material Glass

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

(KCl 3 mol/L, Ag+ free)

KCl-250 109 705

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

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