Hanna Instruments HI8931A, Instruction Manual, Page: 18 / 27

35 34
• Leave the HI 7638 conductivity
probe in air (dry probe).
• When the power is on, the ammeter should
read "
4.0
mA" or the HI 8936L transmit-
ter with LCD should display "
0
".
• If not adjust the OFF-
SET trimmer of the
HI 8936 transmitter to
obtain
"4
mA" or "
0
"
on the HI 8936L.
• The HI 8931 controller
should display "
0
"
value.
• If not adjust the OFF-
SET trimmer of
HI 8931 to display a
zero reading.
CALIBRATION PROCEDURE OF
HI8931 & HI8936 WITH HI7638
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 dif-
ferent models:
HI7034 80 mS/cm @25°C
for HI 8931A, HI 8936A & AL
HI7030 12.88 mS/cm @25°C
for HI 8931B, HI 8936B & BL
HI7031 1413 µS/cm @25°C
for HI 8931C, HI 8936C & CL
HI7033 84 µS/cm @25°C
for HI 8931A, HI 8936A & AL
PROCEDURE
• Connect the HI 7638 to the HI 8936 trans-
mitter (see page 23).
• Connect the HI 8936 transmitter to the
HI 8931 controller (see page 24).
• Connect the HI 8931 controller to the mains
(see page 24).
Before proceeding with
the calibration, make sure
that the meter is in mea-
surement mode (MEA-
SURE LED will be lit) and
not in set mode.
• Connect the ammeter to the HI 8936 trans-
mitter to monitor the signal current (see
the following picture).
MEA
SURE