Hanna Instruments HI 943500A - Manual (Page 16)

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CALIBRATION PROCEDURE OF
HI 8931 & HI 8936 WITH HI 7635
Material needed:
• HI 7635 conductivity probe
• HI 8931 conductivity controller
• HI 8936 conductivity transmitter
• A 20 mA f.s. ammeter (for transmitters without LCD)
• A reference conductivity meter with automatic temperature com-
pensation accurately calibrated (e.g. HI 8733).
PROCEDURE
• Connect the HI 7635 probe to the H I8936 transmitter (see page
24 for details).
• Connect the HI 8936 transmitter to the H I8931 controller (see
page 25 for details).
• Connect the HI 8931 controller to the mains (see page 25 for
details).
Before proceeding with the calibration,
make sure that the meter is in measure-
ment mode ("MEASURE" LED is on) and
not in set mode.
• Connect the ammeter to the HI 8936 transmitter to monitor the
signal current (see below picture).
MEA
SURE
The alarm contacts of HI 8931 and HI 943500 remain closed during
normal operation. If the measured conductivity level is not within the
tolerance of the set value, the alarm contact will be open.
TAKING MEASUREMENTS WITH HI 8931 AND HI 943500
After setting the working point and alarm value, press the "MEASURE" key.
The actual conductivity value of the test solution will be displayed.
TAKING MEASUREMENTS WITH HI 8936AL, HI 8936BL,
HI 8936CL, HI 8936DL
The conductivity transmitters with LCD
will always display the measurement
value when connected to the HI 8931
controllers or a power supply.