Xylem PH3110 FIELD PH METER - Manual (Page 16)

Operation pH 3110
16 ba75791e02 11/2008
4.2 Measuring
Preparatory activities Perform the following preparatory activities when you want to measure:
Note
Incorrect calibration of pH combination electrodes leads to incorrect
measured values. Calibrate regularly before measuring.
Stability control
AutoRead
During the measuring procedure, the stability control function is
automatically activated. The stability control function (drift control)
checks the stability of the measured pH signal and the stability of the
measured temperature signal. The stability has a considerable effect
on the reproducibility of the measured value.
For identical measurement conditions, the following applies:
Temperature sensor You can measure with or without a temperature sensor. If a
temperature sensor is connected, it is indicated on the display by TP.
Note
The pH meter automatically recognizes the type of the temperature
sensor used. Therefore, you can connect combination electrodes with
an NTC30 or Pt1000.
The temperature measurement is absolutely essential for a
reproducible pH measurement. If the measurement is made without a
temperature sensor, proceed as follows:
1 Connect the pH combination electrode to the meter.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature sensor.
3 Calibrate or check the meter with the combination electrode.
4 Select the measured parameter with .
Measured
parameter Reproducibility Response time
pH value < 0.02 pH units > 15 seconds
Temperature < 0.3 °C of temperature value > 15 seconds
1 Measure the current temperature using a thermometer.
2 Set the temperature value with <
▲><▼>.