Greisinger GPRT 1400 AN User guide
H26.0.01.6C-05 page 1 of 6
Operating Manual for Digital pH/mV(Redox)/Thermo-Meter
GPRT 1400 AN
Specification:
Measuring range: position 1 (pH): 0,00 to 14,00pH
position 2 (°C): -20,0 to +110,0°C
position 3 (mV): -1999 to +1999mV
Resolution: 0,01 pH; 0,1°C respectively 1 mV
Accuracy
pH electrode: pH electrode GE100 (standard electrode, in scope of supply), plug in via front-side electrode
Redox electrode: redox electrode GE105 has to be ordered separately, if required.
Temperature probe: Silicon temperature probe (KTY87-205, included in scope of supply),
Temp. compensation: Automatic temperature compensation (ATC) of pH measurement if temperature probe is
Input resistance: approx. 10
Analog output: 1mV/digit, front side connection via 2-pin socket, dia 3.5 mm
Display: approx. 13 mm high, 3 1/2-digit LCD-display
Operating temperature: 0 to 45°C
Nominal temperature: 25°C (accuracy specified at this ambient temperature)
Relative humidity: 0 to 80 %RH (non condensing)
Power supply: 9 V-battery type IEC 6F22 (included in scope of supply) or 10 V-DC mains supply via lateral
Power consumption: approx. 4mA
Low battery warning: "BAT" will be displayed if the battery is exhausted
Dimension: approx. 150 x 86 x 30 mm (h x w x d); impact resistant ABS plastic housing with integrated
Weight: approx. 330g (incl. battery, electrode GE100 and temperature probe)
EMC: the GPRT 1400 AN corresponds to the essential protection ratings established in the regula-
(only device): (pH) ± 0,02 pH ± 1 digit
(°C) ± 0,5°C ± 1 digit
(mV) ± 0,2%v.MW ± 1 digit
socket (cinch).
GE100: combined measuring and reference electrode with refillable 3 mol/l-KCl-electrolyte
Measuring range: 0 to 14 pH, temperature: 0 to 80°C, > 200 µS/cm
For permanent measurements in a highly alkaline environment, insertion measurements,
measurements in waters with a low ion-content, for photography, etc. special electrodes have
to be used (please refer to accessories)
Please note: pH-electrodes cannot be used for redox measurements!
connection via front-side socket (3.5 mm stereo plug). Sensor electrically insulated and
mounted in stainless steel (1.4571) tube, dia 5 mm, approx. 130 mm long, approx. 1 m of
silicone cable with 3.5 mm stereo jack. The device is calibrated to the delivered probe. If the
probe will be exchanged a re-calibration of the device is necessary.
plugged in. (Insert both temperature probe and pH-electrode in measuring or buffer solution.)
If temperature probe is not plugged in the medium temperature (0-90°C) has to be set by
means of the central turning knob. (Switch position 2 [°C]: display of temperature set)
examples: for pH-measuring: pH 0 = 0mV; pH 7 = 700mV, pH 14 = 1400mV
2.5 mm socket (automatic battery disconnection as soon as mains supply device is plugged
in), suitable mains supply device: GNG10
pop-up clip for table-top or suspended operation, electrode can be clipped on laterally.
tions of the council for the approximation of legislation for the member countries regarding
electromagnetic compatibility (89/336/EWG). Additional fault: <1%
12
Ohm
(minus = thread part, plus = insulated centre connection)
for temperature-measuring: 1°C = 10mV, 50°C = 500mV
for redox-measuring : 1mV = 1mV (±1999mV)
(ambient temperature for the device)
H26.0.01.6C-05 page 2 of 6
Calibrating of the mV-range (Redox-Meter):
The device will be set up prior to leaving our works so that calibration of the mV-meter is not required. To carry out
measurements set switch of hand-held measuring device to mV (a digit without decimal point will be displayed on the LCD).
Please make sure to use a redox electrode GE 105 only (special accessories) for measuring. pH-electrodes
cannot be used for redox measurements.
Calibrating of the pH-range:
Accessories required: calibrating solution for ph7 and ph4 (respectively ph10, ph12 (special accessories))
How to prepare a calibrating solution:
- fill 2 plastic bottles (special accessories) with 100 ml distilled water (e.g. battery water) each.
(100 ml will cover the entire cylindrical area, ie approx. 55 mm as of bottle base).
- open ph7 capsule (green) carefully (turn one half of the capsule while pulling and make sure not to spill any
solution), put content (including both capsule parts) into one of the bottles.
- put content of the second capsule for pH 4 (orange) (resp.. pH 10 o. pH 12) including both capsule parts in the
second bottle.
The capsule shell will colour the liquid in the relevant colour:
orange = pH 4,0 ; green = pH 7,0 ; blue = pH 10,0; colourless (white capsule) = pH 12,0
Make sure to prepare the buffer solutions in time as they can only be used after 3 hours. Shake well before use at
the first time.
Calibration of pH-meter:
In order to ensure optimum measuring accuracy, the calibration range should cover the measuring range.
Example for usage of calibration solutions:
measuring around pH 5: pH 4.0 and pH 7.0
measuring around pH 9: pH 7.0 and pH 10.0
Plug in temperature probe into corresponding 3.5 mm dia device socket (make sure not to confuse socket and analog output)
and immerse probe into buffer solution. (Temperature compensation is carried out automatically).
If no temperature probe is available, switch device to temperature measuring, determine temperature of buffer solution and set temperature accordingly using the central turning knob (°C).
Put Cinch plug of pH-electrode into device socket and set switch of the hand-held measuring device to position pH
(a number with decimal point and two additional digits after the point will be displayed on the LCD (e.g. 7.00)).
Setting the first calibration point:
Carefully remove protection cap from electrode. (Attention: cap contains 3 mol/l KCl).
Rinse electrode with distilled water, dry electrode, place it in buffer solution pH 7.0. Wait for approx. 20 to 30 seconds (for display to show stable value), then use turning knob at the right side (pH 7) to set value to 7.00.
Setting the second calibration point:
Rinse electrode with distilled water once again, dry electrode, place it in buffer solution pH 4.0.
Wait for another 20 to 30 seconds (for display to show stable value), then use turning knob at the far left side (pH
X) to set value to 4.00. In order to check calibration repeat procedures for calibration points 1 and 2 using corresponding turning knob for re-adjustments.
In case you did not prepare pH 4.0 but another buffer solution, e.g. pH 10.0 or pH 12.0, the corresponding value
(pH 10.0 or pH 12.0) can be set (calibration of second calibration point) using the left-hand turning knob (pH X).
Please note that for each and every calibration procedure the buffer solution value pH 7.0, ie 7.00, has to be set
by means of the right-hand turning knob (ph 7).
We recommend to re-calibrate the measuring device prior to each new measuring series to ensure optimum accuracy. For this regard that the calibration solution and the measuring solution should have the
same temperature!
After completion of measurements fill electrode protection cap with 3 mol/l KCl-solution and slip it back onto electrode. (Gentle squeezing of the cap displaces air, thus allowing cap to be slipped on easily).
Attention!! pH-electrodes are extremely delicate and sensitive measuring elements. Prior to using the pH electrode, please carefully read corresponding maintenance and measuring manual.
We shall not assume any warranty if customer failures to use proper care and skill (e.g. breaking of electrode, drying-out, blocking etc.).
Points to be observed during measuring
As resistance values (resulting from both the pH electrode and from the measuring device itself) are generally very
high when conducting pH measurements, the electrode should not be hand-held but put down during the measuring operation in order to avoid a shift in voltage parameters between the electrode and the measuring device. In
case there is no suitable place to position the device during measuring, we recommend that the device is held as
far away from the plug as possible and that there is as little movement as possible. Holding the electrode in one
hand and the device in the other, could also help to minimise a shift in voltage parameters as much as possible.
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