wtw Multiline SenTix 94x-P Series User manual

OPERATING MANUAL
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SenTix®94x(-P)
pH ELECTRODE WITH GEL ELECTROLYTE
SenTix®940(-P)
SenTix®940-3
SenTix®945(-P)
OPERATING MANUAL

SenTix®94x(-P)
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Copyright ©2017, Xylem Analytics Germany GmbH
Printed in Germany.

SenTix®94x(-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®94x(-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).
2
4
3
1
Plug connection
closed and locked
Guidance
Groove

SenTix®94x(-P) General information
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2.2 Commissioning
Scope of delivery Electrode SenTix®94x(-P)
Operating manual
Commissioning Prepare the electrode for measuring as follows:
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.
Remove any gas bubbles behind the pH membrane by shaking.
Connect the electrode to the meter.
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
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.
Please keep the watering cap. It is required for the electrode to
be stored. Always keep the watering cap clean.
SenTix®94x(-3) – via the sensor cable to a free IDS connec-
tor on the meter
SenTix®94x-P – via a connecting cable (accessory) to a
free IDS connector on the meter
or
– wireless via an IDS WLM-S adapter
(accessory) to a WLM-capable meter
Accessories for the connection of the
SenTix®94x-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.

Storage SenTix®94x(-P)
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To measure in aqueous solutions, it is recommended to immerse the elec-
trode in a vertical or slightly tilted position.
Observe the correct depth of immersion and make sure the contact
between the junction and test sample is thorough. The junction is in the
area of the bottom end of the shaft (see arrow).
Caution: Only the shaft part of the electrode may be immersed!
For measurements in aqueous solutions, 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.
Preparing the
sensor for
measurement
3Storage
During short
measuring breaks
Immerse the electrode in reference electrolyte (KCl 3 mol/l, Ag+free). Prior
to the next measurement, shortly rinse the electrode with the test sample or
deionized water.
SenTix®94x(-P)
SenTix®94x(-3) Connect the sensor to the meter.
The sensor is immediately ready to measure.
SenTix®94x(-3)-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®94x(-3)-P sensor to the meter are
listed in chapter 7 WEAR PARTS AND ACCESSORIES.

SenTix®94x(-P) Aging
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Overnight or
longer
Put the clean electrode in the watering cap that is filled with reference elec-
trolyte (KCl 3 mol/l, Ag+free).
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.
5 Maintenance and cleaning
Cleaning Remove water-soluble contamination by rinsing with deionized water. Other
types of contamination have to be removed as follows while the contact time
with the detergents should be kept as short as possible:
Do not scratch 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.
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)

Technical Data SenTix®94x(-P)
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NOTE
Hydrofluoric acid, hot phosphoric acid and strong alkaline solutions
destroy the glass membrane.
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 0 ... 80 °C
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 Gel
Junction Fiber (SenTix®940(-3)(-P))
3 x Ceramic (SenTix®945(-P))
Temperature sensor Integrated NTC 30
(30 kat 25 °C / 77 °F)
Connection cable Lengths SenTix®94x(-3): 1,5 (3) m
SenTix®94x-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
Shaft diameter 12 mm
Shaft material PPE/PS (SenTix®940(-3)(-P))
Glass (SenTix®945 (-P))
IDS plug Synthetic materials: Glass fiber reinforced
Noryl, TPU, TPC-ET, POM, PVC, PEEK,
PBT
O-ring: FPM
Contacts gold-Plated

SenTix®94x(-P) Wear parts and accessories
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7 Wear parts and accessories
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
Connection cable
SenTix®94x(-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®94x(-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
General
accessories
Description Model Order no.
Plastic arming for SenTix®94x(-P) pH elec-
trodes
A pHLab/K 903 841

Disposal SenTix®94x(-P)
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8 Disposal
At the end of its operational lifetime, the electrode must be returned to the
disposal or return system statutory in your country (electronic waste). If you
have any questions, please contact your supplier.

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Xylem Analytics Germany GmbH
Dr.-Karl-Slevogt-Str. 1
82362 Weilheim
Germany
Xylem Analytics Germany
Sales GmbH & Co. KG
WTW
Dr.-Karl-Slevogt-Str. 1
82362 Weilheim
Germany
Tel.:
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E-Mail
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