Wtw SenTix 51 User manual

OPERATING MANUAL

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SenTix®

PH COMBINATION ELECTRODES WITH LIQUID REFERENCE SYSTEM

SenTix®51, 52

SenTix®60, 61, 62

SenTix®81, 82

SenTix®91, 92

SenTix®Mic, Mic-B, Mic-D

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SenTix®

Reproduction in whole - or even in part - is prohibited without the

express written permission of WTW GmbH, Weilheim.

Printed in Germany.

For the most recent version of the manual, please visit

www.WTW.com.

SenTix®Technical data

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Technical data

General data

Measurement and application characteristics

WTW model Reference electrolyte Junction NTC Special features

SenTix®51 KCl 3 mol/L, Ag+free Ceramic Yes Plastic shaft

SenTix®52 KCl 3 mol/L, Ag+free Ceramic Yes Plastic shaft

SenTix®60 KCl 3 mol/L, Ag+free Platinum No

SenTix®61 KCl 3 mol/L, Ag+free Platinum No

SenTix®62 KCl 3 mol/L, Ag+free Platinum No

SenTix®81 KCl 3 mol/L, Ag+free Platinum Yes

SenTix®82 KCl 3 mol/L, Ag+free Platinum Yes

SenTix®91 KCl 3 mol/L, Ag+free Platinum Yes Longer shaft

SenTix®92 KCl 3 mol/L, Ag+free Platinum Yes Longer shaft

SenTix®Mic KCl 3 mol/L, Ag+free Ceramic No Half micro combination

electrode

SenTix®MIC-B KCl 3 mol/L, Ag+free Platinum No Micro combination

electrode

SenTix®MIC-D KCl 3 mol/L, Ag+free Platinum No Micro combination

electrode

WTW model pH measur-

ing range

Allowed tempera-

ture range

Membrane resis-

tance at 25 °C

Typical application

SenTix®51 0 ... 14 0 ... 80 °C < 1 GOhm Field

SenTix®52 0 ... 14 0 ... 80 °C < 1 GOhm Field

SenTix®60 0 ... 14 0 ... 100 °C < 600 MOhm Laboratory

SenTix®61 0 ... 14 0 ... 100 °C < 600 MOhm Laboratory

SenTix®62 0 ... 14 0 ... 100 °C < 600 MOhm Laboratory

SenTix®81 0 ... 14 0 ... 100 °C < 600 MOhm Laboratory

SenTix®82 0 ... 14 0 ... 100 °C < 600 MOhm Laboratory

SenTix®91 0 ... 14 0 ... 100 °C < 600 MOhm Laboratory

SenTix®92 0 ... 14 0 ... 100 °C < 600 MOhm Laboratory

SenTix®Mic 0 ... 14 0 ... 100 °C < 700 MOhm Laboratory

SenTix®MIC-B 0 ... 14 -5 ... 100 °C < 1 GOhm Laboratory

SenTix®MIC-D 0 ... 14 -5 ... 100 °C < 1 GOhm Laboratory

Technical data SenTix®

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Shaft dimensions, shaft material, electrical connection

* Coaxial plug according to DIN 19262

** Stage geometry

*** Measured from upper level of built-in grinding (standard grinding NS 7,5)

**** Connection cable not included in the scope of delivery of the combination

electrode (see WEAR PARTS AND ACCESSORIES)

WTW model Shaft Electrical connection

Length

[mm]

Ø[mm] Material Combination

electrode

connection

Meter con-

nection

Cable

length

SenTix®51 120 12 Polyamide Fixed cable DIN*+banana 1 m

SenTix®52 120 12 Polyamide Fixed cable BNC+banana 1 m

SenTix®60 120 12 Glass S7 plug-in

connector

depending on S7

cable****

SenTix®61 120 12 Glass Fixed cable DIN* 1 m

SenTix®62 120 12 Glass Fixed cable BNC 1 m

SenTix®81 120 12 Glass Fixed cable DIN*+banana 1 m

SenTix®82 120 12 Glass Fixed cable BNC+banana 1 m

SenTix®91 170 12 Glass Fixed cable DIN*+banana 1 m

SenTix®92 170 12 Glass Fixed cable BNC+banana 1 m

SenTix®Mic 40/80** 12/5** Glass S7 plug-in

connector

depending on S7

cable****

SenTix®MIC-B 96*** 3 Glass Fixed cable BNC 1 m

SenTix®MIC-D 96*** 3 Glass Fixed cable DIN* 1 m

SenTix®Commissioning, measuring, calibration

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Commissioning, measuring, calibration

Commissioning The combination electrode is filled with reference electrolyte solution in the

factory. Prepare the combination 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.

Note

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

be stored. Always keep the watering cap clean.

SenTix®51, SenTix®52, and SenTix®Mic: Remove any gas bubbles be-

hind the pH membrane by shaking. With all other combination electrodes,

gas bubbles behind the pH membrane are not a problem.

Connect the combination electrode to the meter.

Calibrate the combination electrode according to the operating manual of

the meter and observe the following rules while doing so:

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

beakers are to be filled with next.

– Between measurements, rinse the combination electrode with the so-

lution that follows. Alternatively, you can also rinse the combination

electrode with deionized water and then carefully dab it dry.

Immerse the combination electrode in the solution in a vertical or slightly

tilted position.

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

ly submersed in the solution. The junction is in the area of the bottom end

Refilling

opening

Refilling

opening

Storage SenTix®

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of the shaft (see figure). At the same time, the level of the reference elec-

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

Provide approximately the same stirring conditions for measuring as for

calibrating.

Note

Prevent contact of the pH membrane to the beaker bottom to avoid scratches

on the pH membrane.

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.

Storage

During short

measuring breaks

With the refilling opening open, immerse the combination electrode in

reference electrolyte (KCl 3 mol/L, Ag+free). Prior to the next measurement,

shortly rinse the combination electrode with the test sample or deionized

water.

Note

Prevent contact of the pH membrane to the beaker bottom to avoid scratches

on the pH membrane.

Overnight or

longer

Put the clean combination electrode in the watering cap that is filled with

reference electrolyte (KCl 3 mol/L, Ag+free) and close the refilling opening.

Note

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

combination electrode could be permanently damaged by this. If the liquid in

the watering cap has dried up, condition the combination electrode in

reference electrolyte (KCl 3 mol/L, Ag+ +free) for at least 24 hours.

Note

During longer storing periods, salt sediments may develop on the watering

cap. They do not affect the measuring characteristics and can easily be re-

moved with deionized water when the combination electrode is put into oper-

ation again.

Junction

Referenceelectrolyte

(Example)

Glass membrane

Shaft

SenTix®Aging

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Aging

Every pH combination electrode undergoes a natural aging process. With ag-

ing, the responding behavior becomes slower and the electrode slope and

asymmetry change. Moreover, extreme operating conditions can consider-

ably shorten the lifetime of the combination 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.

Maintenance and cleaning

Refilling the

reference

electrolyte

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

junction from the combination electrode into the test sample. If the level of ref-

erence electrolyte becomes too low with time, refill it through the refilling

opening. Refilling 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 combination 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.

Wear parts and accessories SenTix®

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

move other contamination as follows:

Note

Hydrofluoric acid, hot phosphoric acid and strong alkaline solutions destroy

the glass membrane.

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

reference electrolyte solution for at least 1 hour. Then recalibrate the combi-

nation electrode.

Wear parts and accessories

Note

Detailed information on our wide range of buffer solutions and more acces-

sories is given in the price list of the WTW catalog "Laboratory and field in-

strumentation".

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)

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.

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

Connection cable S7 plug-in connector/DIN, 1 m AS/DIN 108 110

Connection cable S7 plug-in connector/DIN, 3 m AS/DIN-3 108 112

Connection cable S7 plug-in connector/BNC,

AS/BNC 108 114

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