Dr. A. Kuntze PH-T User manual

Manual
PH-T
pHandmVsimulator
forpH/ORPmetersand
pH/ORPsensors

Dr.A. Kuntze GmbH
Robert-Bosch-Str. 7a
D-40668 Meerbusch
Tel. [phone]
Fax [phone]
[email protected]
www.kuntze.com
Vertrieb / sales:
[email protected]
[phone]
Dr. A. Kuntze
Gutes Wasser mit System

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Your PH-T
Is an easy-to use tester and an invaluable tool for trouble-shooting. It can play the role
of either instrument or sensor and thus allows yolu to verify the function of both
instruments and sensors.
Trouble with pH measurements is often tackled by simply replacing the sensor - an
expensive solution, and not always effective. A quick check with the PH-T shows you
whether the trouble is really located in the sensor.
On the other hand, the PH-T can be used as an ideal sensor to check instruments and
cable connections. No need for buffer solutions - the PH-T simulates electronically the
measuring signals a sensor would give in various solutions. Select arbitrary test
values, either in mV or in pH.
Last not least you can verify the high resistance required for pH measurements within
the whole measuring system by simply pushing a button.
Operation is easy: just choose between testing a sensor or testing an instrument.
The handheld instrument can be used with batteries or rechargeables and provides a
recharging function. A start delay prevents accidental activation during transport.
With the PH-T you have certainly made a good choice. And if through using it you have
become curious to see some of the other products of Dr. A. Kuntze, have a look at our
web site www.kuntze.com or just give us a call - we would be delighted to help you!

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Content
1. Instrument test ORP.............................................................5
2. Instrument test pH................................................................6
2.1 High resistance test ...........................................................7
3. Sensor test ...........................................................................8
4. Batteries and accumulators..............................................10
5. Technical data ................................................................... 11

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1. Instrument test ORP
1 - Connect
Connect the PH-T via the adapter to the ORP cable of your instrument.
2 - Switch on
Switch on the PH-T by pressing key “ON“ for 5 seconds.
NOTE Switch-on is delayed to prevent accidental activation during transport.
3 - Test
Test in progress - if your instrument is working fine, it displays now the same value that
is shown in the display of the PH-T.
By use of the scroll keys of the PH-T you can set an arbitrary value within +/-1500mV.
Your instrument must react within a few seconds to any changes and finally show the
same value as the PH-T.
NOTE If you press a scroll key once, the value increases or decreases by 1 .
Hold it, and the value starts changing continuously, first slowly, then
faster.

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2. Instrument test pH
1 - Connect
Connect the PH-T via the adapter to the pH cable of your instrument.
2 - Switch on
Switch on the PH-T by pressing key “ON“ for 5 seconds.
NOTE Switch-on is delayed to prevent accidental activation during transport.
3 - Select pH
Press the key labeled “F“ once to switch to the pH mode. Values are now displayed as
pH, indicated by “pH“ in the upper right-hand corner.
4 - Test / Calibration
For correct pH measurements, calibration is required with every new sensor. In this
test, the PH-T plays the role of the sensor. Therefor, carry out a calibration of your
instrument as if the PH-T were a regular pH electrode. Fortunately, with the PH-T you
do not need any calibration solutions.
Adjust the value of the PH-T to the pH value of the buffer solution you usually use, for
e.g. pH 7. Calibrate your instrument. Adjust the value of the PH-T to the pH value of the
second calibration solution, for e.g. pH 4, and calibrate your instrument again.
If your instrument works fine, then it will show now the same value as the PH-T, and
the calibration results were: a slope of 58 mV/pH, and a zero point of 0mV.
5 - Test
By use of the scroll keys of the PH-T you can set an arbitrary value within pH 0 - 14.
Your instrument must react within a few seconds to any changes and finally show the
same value as the PH-T.
NOTE If you press a scroll key once, the value increases or decreases by 1 .
Hold it, and the value starts changing continuously, first slowly, then
faster.
NOTE You do not want to calibrate? No problem. Many pH instruments
provide a mV display, for e. g. in the service menue, or can be
switched to ORP measurement. In both cases you can use the mV
mode of the PH-T and compare the mV values without calibration.

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2.1 High resistance test
This test is only carried out with pH instruments. The high electric resisitance of the pH
glass electrode requires an equally high resistance wihtin the whole measuring
system. If the reistance drops, for e. g. due to humidity, the measurement becomes
unstable and tends to drift or wave.
To test the high resistance of the instrument and the cable, the PH-T is equipped with
an even higher internal resistance that can be activated with the key labelled “MegaΩ“.
If the resistance is high enough throughout your measuring system, the activation has
no effect - the values displayed by the instrument and the PH-T remain more or less
unchanged. If not, then the value will decrease drastically.
1 - Connect
Connect the PH-T via the adapter to the pH cable of your instrument.
2 - Switch on
Switch on the PH-T by pressing key “ON“ for 5 seconds.
NOTE Switch-on is delayed to prevent accidental activation during transport.
3 -Adjust value
Stay in the mV mode. Adjust the value to approx. 300mV. Your pH instrument should
show now approx. pH 2.
4 - High resistance test
Press the key labelled “MegaΩ“. “MΩ“ in the display indicates that the high resistance
has been activated.
Focus on the value displayed by the PH-T: if it drops significantly, e. g. to approx. half its
original value, then the measuring system does not provide the required high
resistance.
NOTE Often the cable rather than the instrument is the source of loss in
resistance - to make sure, repeat the test with a different cable!
NOTE The high resistance test consumes a lot of battery power - don´t
forget to switch it off by pushing again the key “MegaΩΩ
ΩΩ
Ω“!

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3. Sensor test
1 - Connect
Connect the sensor to the PH-T using the COAX cable.
2 - Switch on
Switch on the PH-T by pressing key “ON“ for 5 seconds.
NOTE Switch-on is delayed to prevent accidental activation during transport.
3 - Select sensor test
Press key “F“ twice to enter the measuring mode. The display now shows the signal of
the sensor in mV, and “M2“ indicates the measuring mode.
4 - Test
Immerse the sensor in a buffer solution.
NOTE Mind the temperature! Buffer values are usually given for a reference
temperature of 25°C.
With ORP sensors, interpretation of the measuring signals is easy: The value must be
as close as possible to the value indicated on the buffer label. Any deviation can be
regarded as a sensor error.
With pH electrodes, please refer to the tables on the following page.

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Interpretation of the mV signals of pH sensors
The following table shows the mV values an ideal sensor would give in various buffer
solutions:
pH 0 1 2 3 4 5 6 7
mV ideal 406 348 290 232 174 116 58 0
pH 7 8 9 10 11 12 13 14
mV ideal 0 -58 -116 -174 -232 -290 -348 -406
If your sensor does not show exactly those values, don´t worry - it simply means that
your sensor does not have a slope of 58mV/pH and/or that its zero point is not exactly
pH 7. For evaluation, determine its characteristics: the slope and the zero point error.
The zero point error is the mV value found in pH 7. For new sensors it should not be
greater than +/-15mV, for used sensors up to +/-55mV are tolerated.
The slope is the signal change in mV per pH. If you are working with buffers pH 7 and
pH 4, than the mV difference between them is 3 times the slope. The following table
gives a rough overview:
mV(pH4) - mV(pH7) 150 155 160 165 170 175 180
Slope / mV/pH 50 52 53 55 56 58 60
A new sensor should show a slope between 57 and 59 mV/pH, for used sensors
values between 50 and 60 mV/pH are tolerated.
NOTE All those values are based on a temperature of 25°C. At higher
temperatures, slopes will be higher.

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4. Batteries and accumulators
At works the PH-T is equipped with a 9V battery. This will last approx. 72 hours when
used for simulation (instrument test). When used for measurement (sensor test) or
high resistance test, power consumption is higher.
NOTE The instrument does not indicate low battery.
The battery is accessible from the back of the instrument. Observe the safety and
environment regulations for handling, storage, and disposal of batteries.
The PH-T can be used with rechargeable batteries and provides a charging function.
For specifications of connection and current-supply please refer to the technical data.
The time necessary for recharging of a completely discharged accumulator depends
on the type and the capacity. It can be calculated as follows:
Ni-Cd Charging time (h) = capacity (mAh) x 0.07778
Ni-MH Charging time (h) = capacity (mAh) x 0.08333
ATTENTION The PH-T does not automatically stop the charging process. Take care
not to exceed the calculated charging time.
CAUTION Never try to recharge regular batteries!

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5. Technical data
Dimensions 157 x 84 x 30 mm (HxWxD)
Weight 0.5 kg
Connection BNC
Protection class IP 40
Power supply 9V battery 1200mAh or 9V accumulator (Ni-Cd, Ni-MH)
Power consumption 149mW (instrument test)
329mW (sensor test, high resistance test)
Charging specification Hollow plug OD 5mm, ID 2mm, 15-16V(-) / 16-20mA
Display LCD 3.5characters, indication of unit and function
Simulation range +/-1500 mV
(instrument test) 0.0 - 14.0 pH
1 GigaOhm high resistance test
Measuring range +/- 1500 mV
(Sensor test)
Accessories(notincluded): Order number
Cable COAX-F-2-1,5, BNC plug/electrode plug 44136020K
for connection of sensors
Adapter, BNC plug/electrode plug 49100010K
for connection to pH/ORP cables
Complete set (PH-T, cable, adapter, case) 45512800K