Xylem Lab 850, starting from serial number 09470315 - Manual (Page 19)

Lab 850 Operation
19 ba75890e01 11/2009
4.3 Measuring
Preparatory activities Perform the following preparatory activities when you want to measure:
Note
Incorrect calibration of pH electrodes leads to incorrect measured
values. Calibrate regularly before measuring.
CAUTION
When connecting an earthed PC/printer, measurements cannot be
performed in earthed media as incorrect values would result.
The RS232 interface is not galvanically isolated.
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 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:
Note
When calibrating without temperature sensor, also set the current
temperature of each buffer solution manually (see <
▲><▼>).
1 Connect an 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 electrode.
4 Select the measured parameter with .
1 Measure the current temperature using a thermometer.
2 Set the temperature value with <
▲><▼>.