Xylem WTW SenTix ORP-T 900 User manual

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
Copyright ©2017, Xylem Analytics Germany GmbH
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)
2
4
3
1
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
or
– 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