5
4
FUNCTIONAL DESCRIPTION
HI 8931 & HI 943500
KEYPAD
MEASURE To read the measurement values
and to enable the diagnostic tests
∆∆∆∆∆
AL
To display the set tolerance of
the alarm
SET
To set the working point
TEST SLOPE Diagnostic function
TEST OFFSET Diagnostic function
When each key is pressed the LED is lighted
indicating to the user that the function is in
operation.
TRIMMERS
OFFSET
For offset calibration
SLOPE
For slope calibration
∆∆∆∆∆
AL
To set the alarm tolerance
COARSE
To coarsely adjust the working point
SET FINE
To finely adjust the working point
LEDS
SET ON
To show that the dosage is active
ALARM
To show that the controller is in
alarm mode.
HI 943500 features a direct connection up
to 20 m (67'), without intermediate amplifi-
ers, to the conductivity probe HI 7638 with
7-pin DIN connector and automatic tempera-
ture compensation.
Four models with different measurement
ranges are available to suit individual appli-
cations:
HI 8931A / HI 943500A
HI 8936A / HI 8936AL
from 0.0 to 199.9 mS/cm
HI 8931B / HI 943500B
HI 8936B / HI 8936BL
from 0.00 to 19.99 mS/cm
HI 8931C / HI 943500C
HI 8936C / HI 8936CL
from 0 to 1999 µS/cm
HI 8931D / HI 943500D
HI 8936D / HI 8936DL
from 0.0 to 199.9 µS/cm
Other features include: recorder output in 0
to 20 mA or 4 to 20 mA configuration; LED
indicators (for HI 8931 and HI 943500) which
identify whether the controller is in opera-
tion mode or selection mode.
Each instrument is supplied with a plastic
front cover and two mounting brackets.
Power cables are excluded.
Transmitters and conductivity probes are
supplied separately.