JF-1A Conductivity Sensor
A440-009
Page 37 of 56
FEBRUARY 2009
500
20.0
5.00
Equipment Required:
a)
JF-1 Serial Test Cable FSI P/N B440-079
b)
Serial Data Communicating Device, set for operation at
9600 baud, 1 stop, 8 data, No parity
c)
250 ohm sensing resistor
d)
Digital Multi Meter with 0.001 VDC resolution.
e)
Power 24.0 VDC
Procedure:
a)
Connect the probe to the power supply as detailed in the manual in
series with either the 100 or 200-ohm sense resistor.
b)
Select the range of operation the 4 – 20 ma output is to represent, as
example, say we want 20 mA to equal 700* pS/M and 4 mA to Equal 0
pS/M.
(* Non Standard Range)
c)
Connect the serial cable to the test jack on the JF-1 Sensor. On the PC
press enter and confirm connection is made by the receipt of a single line
of data from the JF-1 Sensor.
d)
Place the unit in open mode using the “***O” command followed by the
enter key. Verify the unit is in OPEN MODE by pressing an additional
entering key, the JF-1 will respond with the words “OPEN MODE”.
e)
Read the current full scale value of the current output DAC, enter the
request “DAF” the unit will return “DAF=585, where “585”is the current
setting, one can assume the full scale range is 500, note the DAF value
represents a “scaling” factor and will not exactly be equal to the range.
f)
As we are changing he range to 700 pS/m full scale we can make an
initial assumption the DAF value will need to be increased
