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I0000150 Rev 4 Page 3 of 4
RH CALIBRATION INSTRUCTIONS
Note: This is only a single point calibration. All
transmitters are factory calibrated to meet/exceed
published specifications. Field adjustment should not be
necessary.
The dipswitch allows the user to calibrate the sensor through
the software. Setting switch 4 ON will put the transmitter into
setup mode allowing the increment and decrement to work.
Once in setup mode, the output will change to 50% (12mA for
4-20mA). Each increment or decrement step will cause the
output to change by 0.32mA for 4-20mA in setup mode. This
can be used to show the user how far offset the transmitter is.
To see the starting point again set switch 1 ON. This will show
the 50% output again. When the unit is out of setup mode the
output will go back to RH output.
Increment RH Output
This will shift the RH output linearly up in 0.5% steps. Switch
4 must be set to ON first. After switch 4 is on, each time
switch 5 is set ON the RH output will increase by 0.5%. The
increase goes into effect each time switch 5 is set to ON.
Decrement RH Output
This will shift the RH output linearly down in 0.5% steps.
Switch 4 must be set to ON first. After switch 4 is on, each
time switch 6 is set ON the RH output will decrease by 0.5%.
The decrease goes into effect each time switch 6 is set to ON.
Reset RH Output
This will reset the RH output back to the original calibration.
Switch 4 must be set to ON first. After switch 4 is on, toggle
switches 5 and 6 ON then OFF. After 5 and 6 are OFF slide
switch 4 OFF.
When all calibration is completed, remember to place the
switches back into the positions that correspond to the output
needed as shown in Figure #7.
Note: Potentiometers P1 (Zero) and P2 (Span) in Figures
#1 and #2 are not used for RH sensor calibration. They
are used for factory use only!
TEST INSTRUCTIONS
Test mode will make the transmitter output a fixed 0%, 50%,
or 100% value. The sensor will not affect the transmitter
output. This is used for troubleshooting or testing only.
Switches 1, 2, and 3 are used for test mode. The output will be
a fixed 0%, 50%, or 100% signal that corresponds to the
output selected with switches 6, 7, and 8. Refer to Figure #8
for switch settings.
RH CONVERSION FORMULAS
To convert output signal to percent RH:
4-20 mA
((mA signal) -4) / 0.16 = percent RH
Example: 12mA output signal
(12-4) / 0.16 = 50% RH
Test Selection Switches (SW1)
ON
2
6 81
OFF
50% RH Output
100% RH Output
4
3
OFF
5
ON
7
ON
2 3
7 8
ON
1 4 5 6
OFF
ON
4 8
0% RH Output
1
ON
2 3
5 6 7
Figure #8
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