ProMinent DULCOTROL, Общие инструкции по эксплуатации

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Pr o Minent
®
Page 111
pH/Chlorine
Calibration
DULCOTEST ® sensor PHEP or PHER for pH
Calibration of the pH Sensor
The calibration of the pH sensor uses a two-point calibration method (zero point, slope). As buffer
pH 7 (zero point calibration) and pH 4 (slope calibration) are factory-set. If other buffers are to be
used, the defaults in the complete operating menu (menu A, B) may be altered. During calibration
control is stopped and metering is reduced to the set base load. The output 0/4...20 mA (meas ur-
ing value) will be frozen. After successful calibration, all fault determinations relating to the meas-
ur ing value are started again. The current sensor data (zero point/slope) will be displayed.
Calibration of the pH Sensor (Continuation)
Possible values
Initial value Increment Lower value Upper value Remarks
Buffer values pH 7 0.01 pH -2 pH 16 pH Error messages
pH 4 when both
buffers too close
(<2 pH-values)
calibration pH
zero p.: -3,1 mV
slope at 25
° C
58.32 mV/pH
calibration? calibration pH
buffer 1: 7.00 pH
mea. val: 7.00 pH
signal: -3,1 mV calibration pH
calib. 1 active
please wait!
-3.1 mV 23.5 ° C
calibration pH
buffer 2: 4.00 pH
mea. val: 4.00 pH
signal: 157 mV calibration pH
calib. 2 active
please wait!
157 mV 23.5 ° C
calibration pH
probe in buffer
buffer: 7.00 pH
temp.: 23.5 ° C
calibration pH
probe in buffer
buffer: 4.00 pH
temp.: 23.5 ° C
calibration pH
zero p.: -3,1 mV
slope at 25
° C
53.70 mV/pH
D2C2-pH-CI-T2-D
A
B
Error message Condition Remarks
Buffer distance Δ Buffer <2 pH During calibration procedure:
too small Recalibrate buffer 2!
Return to permanent display:
Basic metering load Warning, old zero
point and slope
retained
pH zero point low < -60 mV „ „
pH zero point high < +60 mV „ „
pH slope low <45 mV/pH „ „
pH slope high >65 mV/pH „ „
Measured value „
pH unsteady
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