JF-1A Conductivity Sensor
A440-009
Page 51 of 56
FEBRUARY 2009
m)
Store the values in the internal EEPROM using the
“***E” command. The when complete will respond
with a carriage return.
n)
Return the unit to RUN MODE using the “***R”
command.
Section 4.0 Method of Adjustment 4-20 mA output span JF-1 Sensor
:
General Temperature:
The JF-1 Sensor can be used in temperatures outputs from -20˚C to 100˚C*. Normally
the sensor has the 4-20 mA output scaled for a specific range which allows the user to
optimize the interface for a specific application. The procedure below should be
followed if the user elects to change the range for a specific application. The JF-1 is
nominally set for -20˚C - 60˚C representing the output range of 4 – 20 mA. This is
detailed in Table 2 below:
*WARNING: CONSULT THE SAFE USE MANUAL FOR SAFE AMIBENT
OPERATING CONDITIONS FOR THE JF-1A SENSOR. THE TEMPERTURE
RANGE LISTED ABOVE IS THE THORETCAL RANGE OF THE TEMPERATURE
ELECTONICS, NOT THE SAFE USABLE RANGE.
Table 2
Reading
Current mA
Voltage 100
ohm Sense
Voltage 250
Ohm Sense
-20
4.0
0.4
1.00
0
8.0
0.8
1.25
20
12.0
1.2
2.50
40
16.0
1.6
3.75
60
20.0
2.0
5.00
Detail Instructions to Change Output Temperature Current Range
Representation:
Note: if the user can read temperature values directly from his PLC then it is
better to calibrate directly from Temperature Reading at the sensor to
Temperature Reading by the PLC, in this way all errors of reference resistor,