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
For Sales & Service Contact
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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. 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. The sensor firmware
can be updated via the meter.
2 Commissioning, measuring, checking
For ORP electrodes with platinum electrode, please follow the
instructions in section 6 ACTIVATING PLATINUM ELECTRODES.

Commissioning, measuring, checking SenTix®ORP-T 900(-P)
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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).
2.2 Commissioning
Scope of delivery Electrode SenTix®ORP-T 900(-P)
2
4
3
1
Plug connection
closed and locked
Guidance
Groove

SenTix®ORP-T 900(-P) Commissioning, measuring, checking
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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 combination electrode to the meter.
Measure with the electrode according to the operating manual of the meter
and observe the following rules while doing so:
Preparing the
sensor for
measurement
2.3 General rules for measuring
Make sure the refilling opening for the reference electrolyte solution is
open.
Please keep the watering cap. It is required for the electrode to
be stored. Always keep the watering cap clean.
Refilling
opening
SenTix®ORP-T 900 Connect the sensor to the meter.
The sensor is immediately ready to measure.
SenTix®ORP-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®ORP-T 900-P sensor to the meter
are listed in chapter 8 WEAR PARTS AND ACCESSO-
RIES.

Commissioning, measuring, checking SenTix®ORP-T 900(-P)
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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
normal hydrogen
electrode
UH= UMeas + URef
URef is temperature dependent and can be taken from the following table (see
also DIN 38404-6):
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
T (°C) T (°F) URef [mV] T (°C) T (°F) URef [mV]
SenTix®ORP-
T 900
SenTix®ORP-T 900
0 32 +224 35 95 +200
5 41 [phone] +196
10 50 [phone] +192
15 59 [phone] +188
20 68 [phone] +184

SenTix®ORP-T 900(-P) Storage
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3Storage
During short
measuring 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
longer
Insert the clean electrode into the watering cap filled with reference electro-
lyte and shut the refilling opening.
4 Aging
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
High changes in pH and temperature.
The warranty does not cover failure caused by measuring conditions and
mechanical damage.
25 77 [phone] +180
30 86 +203
T (°C) T (°F) URef [mV] T (°C) T (°F) URef [mV]
SenTix®ORP-
T 900
SenTix®ORP-T 900
Electrode Reference electrolyte Model
(see page 11)
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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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
reference
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:
After cleaning Rinse the electrode with deionized water.
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)
Protein 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®ORP-T 900(-P) Activating platinum electrodes
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6 Activating platinum electrodes
First-time
activation during
installation and as
required
For first-time activation use the activation powder from the SORT/RH reagent
set (component of the SORT/RH reagent set). Immerse the moist (but not
dripping) platinum electrode into the activation powder and rotate the elec-
trode several times in the powder. Then remove the activation powder under
flowing water with a soft brush (e.g. toothbrush).
Activation during
very long set-up
times
When changing from oxidizing to reducing test solutions and vice versa this
can result in set-up times that can take significantly more than an hour. In this
case pretreatment (activation) of the platinum surface can shorten the set-up
time. The type of pretreatment (reducing or oxidizing) is based on the pH
value and the ORP voltage (UH) of the test solution where the latter must be
estimated for the first measurement.
The type of pretreatment can then be determined using the following diagram
where UHis based on the normal hydrogen electrode:
Oxidizing pretreat-
ment
Immerse the platinum electrode for two to three
days in a sulfuric acid clorina solution (0,5 g clorina
powder, 100 ml H2O dist., 2-3 ml 20% sulfuric acid).
Clorina powder for producing the solution is
included in the SORT/RH reagent set.
Note: The diaphragm must not be immersed in the
clorina solution!
Reducing pretreat-
ment
When the electrode is ready for the test immerse it
in the RH 28 ORP buffer solution and wait for a sta-
ble measured value.
Detailed information on activating platinum electrodes, such as
how to produce the clorina solution, is given in the WTW applica-
tion report entitled REGENERATING ORP ELECTRODES. The appli-
cation report is included in the SORT/RH reagent set.
1000
800
600
400
200
20481012146
0
pH value
UHin mV oxidizing pretreatment
reducing pretreatment

Technical data SenTix®ORP-T 900(-P)
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7 Technical data
Measurement 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 pins
Shaft dimensions,
material
Shaft length 120 mm
Shaft diameter 12 mm
Shaft material Glass
IDS plug Synthetic materials: Glass fiber rein-
forced 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

SenTix®ORP-T 900(-P) Wear parts and accessories
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8 Wear parts and accessories
9 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.
Maintenance
equipment
Description Model Order no.
Reference electrolyte solution 3 mol/l KCl,
Ag+free (250 ml)
KCl-250 109 705
Reagent set for regenerating ORP platinum
electrodes, consisting of 10 g activation
powder and 30 g clorina powder
SORT/RH 109 730
ORP 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
cableSenTix®ORP
-T 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
General
accessories
Description Model Order no.
Blind plug for IDS plug BPO/IDS 900 908 371
Armoring without protective hood A 925-P 903 838
Armoring with plastic protective hood A 925-P/K 903 839
Armoring with steel protective hood A 925-P/S 903 840
Plastic arming for SenTix®ORP-T 900(-P)
pH electrodes
A pHLab/K 903 841

Disposal SenTix®ORP-T 900(-P)
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