Hanna Instruments HI 943500A - Manual (Page 18)

35 34
CALIBRATION PROCEDURE OF
HI 8931 & HI 8936 WITH HI 7638
Material needed:
• HI 7638 conductivity probe
• HI 8931 conductivity controller
• HI 8936 conductivity transmitter
• An ammeter (for transmitters without LCD)
• Calibration solutions, according to the different models:
HI 7034 80 mS/cm @25°C
for HI 8931A, HI 8936 A/AL
HI 7030 12.88 mS/cm @25°C
for HI 8931B, HI 8936 B/BL
HI 7031 1413 μS/cm @25°C
for HI 8931C, HI 8936 C/CL
HI 7033 84 μS/cm @25°C
for HI 8931D, HI 8936 D/DL
PROCEDURE
• Connect the HI 7638 to the HI 8936 transmitter (see page 24).
• Connect the HI 8936 transmitter to the HI 8931 controller (see
page 25).
• Connect the HI 8931 controller to the mains (see page 25).
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 calibration is now complete and the instrument is ready for
use. All subsequent measurements will be compensated to 25°C
(77°F).
• If the instrument will not calibrate, refer to the "Probe Mainte-
nance and Cleaning" section on page 46.
• If the HI 8936 is not used in conjunction with the HI 8931
controller, connect the transmitter to an external power supply (see
page 20), to the HI 7635 conductivity probe (see page 24) and
to an ammeter (see page 20).
The calibration of the transmitters with LCD (HI 8936L series) does
not require an ammeter.
Follow the above calibration procedure performing the operations
referred to the HI 8936 transmitter only.