31
30
• Ensure that there is no solution inside the
HI 7635 conductivity probe (dry probe).
• When the power is on, the ammeter should
read "
4.0
mA". The HI 8936L transmitter
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 control-
ler should display "
0
"
value.
• If not adjust the OFF-
SET trimmer of
HI 8931 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 bea-
ker.
• Measure the conduc-
tivity of the solution
with the HI 8733 por-
table conductivity
meter with ATC. The
ins rum n s
ON
OFF
HI 8733
199.9
mS
19.99
mS
1999
µ
S
199.9
µ
S
2.5
2
1.5
1
0.5
0
TEMPERATURE COEFFICIENT
µ
S
°C
CALIBRATION PROCEDURE OF
HI8931 & HI8936 WITH HI7635
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 auto-
matic temperature compensation accu-
rately calibrated (e.g. HI 8733).
PROCEDURE
• Connect the HI 7635 probe to the HI 8936
transmitter (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