NovaLynx Corporation
200-100C-4
Page 7
September 2018
5
WIRING DIAGRAM
1 2
White - Signal in
Black - Reference
Shield - Earth ground
4-20 mA Loop +
4-20 mA Loop -
Red - Excitation
Analog Output
Evaporation Gauge
Model 255-100
255-100C-4 WIRING DIAGRAM
T
he Analog Output Evaporation Gauge (sold separately) includes 50 feet of shielded cable. The cable
can be extended up to a total of 250 feet if required. If the cable is extended be sure to spice the shield
also in order to reduce electrical noise.
CAUTION: Be sure to observe correct polarity when connecting to the 4-20 mA loop circuit. Internal
diodes will protect the Signal Conditioner if wired backwards, but the output will be meaningless.
Cable for connecting the 4-20 mA loop is not supplied. Use a wire gage adequate to provide a
minimum of 8 volts at the Signal Conditioner after voltage drop over the cable is accounted for. The
cable grips will accept 0.181" to 0.312" (4.6 to 7.9 mm) diameter cable.
6
CALIBRATION
When ordered together with an Analog Output Evaporation Gauge the 255-100C-4 Signal Conditioner
is individually factory calibrated to the Gauge. Recalibration is not necessary unless the Gauge is
replaced (see Appendix A for instructions).
At installation, the float/chain assembly of the Analog Output Evaporation Gauge must be correctly
installed on the gear, otherwise the sensor output will be meaningless. Instructions for setting the
position of the gear with respect to the chain are given in the 255-100 Analog Output Evaporation
Gauge manual.
