JF-1A Conductivity Sensor
A440-009
Page 49 of 56
FEBRUARY 2009
Equipment Required:
k)
JF-1 Serial Test Cable FSI P/N B440-079
l)
Serial Data Communicating Device, set for operation at 9600
baud, 1 stop, 8 data, No parity
m)
PLC Connected to JF-1A Current Output with ability of the
operator to read the value directly in pS/M from the PLC.
Procedure:
a)
Connect the probe to the PLC.
b)
Select the range of operation the 4 – 20 ma output is to
represent, as example; say we want 20 mA to equal
2000 pS/M and 4 mA to Equal 0 pS/M.
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. (Or turn the unit on add see the turn on
banner being received).
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 1000 pS/M full scale
we can make an initial assumption the DAF value will
be approximately 20% higher than the range of
interest, so we will enter a new value of DAF = 1000 *
1.2 = 1200, This value is temporarily entered into DAF
by sending “DAF=1200”.
