Hanna Instruments HI 943500A - Manual (Page 17)

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• The reading will be converted to mA by the following formula:
mA = K (measured value x 16/2000) + 4
K = conversion factor depending on the model
Model Conversion factor K
HI 8936 A/AL 10
HI 8936 B/BL 100
HI 8936 C/CL 1
HI 8936 D/DL 10
For example, using an HI 8936A, if the measured value is 123.4
mS, then
output current = 10 x (123.4 x 16/2000)+4 = 13.9 mA
Adjust the HI 8936 SLOPE trim-
mer to read "13.9 mA" on the
ammeter, or the reading of the
HI 8733 (e.g. 123.4 mS) on
the HI 8936L display. .
• Adjust the HI 8931 SLOPE trimmer until the controller reading is
the same as the one displayed by the HI 8733 (e.g. 123.4 mS).
• Ensure that the HI 7635 conductivity probe is dry.
• When the power is on, the ammeter should read "4.0 mA".
The HI 8936 transmitter with LCD should display "0".
• If not, adjust the transmitter OFF-
SET trimmer to read "4 mA" or
"0" on the HI 8936 LCD.
• The HI 8931 controller should dis-
play "0" value.
• If not, adjust the HI 8931 OFF-
SET trimmer to display a zero
reading.
• Switch the flow on and allow the
sample solution to flow through
the HI 7635 conductivity probe.
Collect a sample of this solution in
a beaker.
• Measure the conductivity of the
solution with a reference conduc-
tivity meter with ATC (HI 8733).
The value obtained will be used
for the transmitter and controller
calibration.