JF-1A Conductivity Sensor
A440-009
Page 56 of 56
FEBRUARY 2009
the value we want it to output in equivalent current.
This is done by entering “Temp=50” to the JF-1 unit.
25)
Read the PLC reading, this reading should equal 50˚C.
If this is not attained TDAF needs to adjusted, increase
the value of TDAF if the reading is low, decrease the
value if the voltage is high. After each new entry of
TDAF you MUST reenter the “TEMP=50” to change
the sensor output. Repeat until the same reading on
the PLC is obtained as entered by the TEMP
command.
26)
After steps 5 – 6 are complete the user should now
check the “low end of the range to ensure the slope
adjustment has not resulted in “significant errors of the
low end.
27)
To test this value we need only to set conductivity to
our desired 4 mA value by sending “TEMP=0” to the
JF-1A unit.
28)
Again read the PLC output and verify a 0˚C reading.
If this is not attained TDA0 needs to adjusted, increase
the value of TDA0 if the Reading is low, decrease the
value TDA0 if the reading is high
.
Remember to
reenter “TEMP=0” after each adjustment of the TDAO
value is made to update the sensor output.
29)
Full scale can then again be checked using the entry
again of the full-scale values, when complete unit is
ready.
30)
Store the values in the internal EEPROM using the
“***E” command. The when complete will respond
with a carriage return.
31)
Return the unit to RUN MODE using the “***R”
command.