NovaLynx Corporation
260-RGAI-70
Page 5
May 2022
4
SITE SELECTION
The rain gauge exposure is important to collecting accurate information. Refer to the manual for your rain
gauge for specific recommendations. Ensure the rain gauge is level, otherwise the system may not
operate correctly.
If possible, locate the 260-RGAI-70 transmitter enclosure indoors or other protected location. The
enclosure is watertight if the cover is installed properly, however, the temperature specification of the
standard unit is only 30°F (~0°C), and therefore protection from extreme cold is desirable.
5
POWER SUPPLY
CAUTION:
Do not apply power to the rain gauge input terminals, as this will damage the
transmitter board.
NOTE:
The power supply voltage ripple must be less than 100 volts per second for proper
operation.
A 12-24 VDC loop power supply is recommended for operation of this instrument. The input voltage
must take into account all of resistance in the current loop. If the input voltage is too low the output
will not reach full scale.
Total resistance of the current loop includes the
input impedance of the monitoring system plus the
resistance of the wiring.
Find the input impedance of your system by
consulting the user manual.
Calculate the wiring resistance using the chart.
Add together to obtain the total loop resistance.
Consult the chart below to determine the
required minimum power supply voltage.
AWG
Ohms / foot
12
0.0016
14
0.0026
16
0.0041
18
0.0065
20
0.0103
22
0.0165
24
0.0262
RESISTANCE OF COPPER WIRE
