5
IOM-T-088 2205
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Testing and Troubleshooting
An electrical multimeter capable of measuring between 0 to 5 volts DC is required.
Using the electrical meter probes, measure the voltage between the black (power common) and red (reference voltage)
wires. The expected voltage is 5.0 V(dc).
Using the electrical meter probes, measure the voltage between the black (power common) and green (ratiometric
signal input) wires. The voltage signal should be between 0.5 to 4.5 V(dc). Using the lookup table below, compare the
measured voltage to a mechanical pressure gauge mounted on the hydronic system. The signal should be accurate
within 1% over the full scale.
Pressure (psi)
Pressure (kPa)
Ratiometric Voltage (Vdc)
0
0
0.50
5
34
0.63
10
69
0.77
15
103
0.90
20
138
1.03
25
172
1.17
30
207
1.30
40
276
1.57
50
345
1.83
60
413
2.10
70
482
2.37
80
551
2.63
90
620
2.90
100
689
3.17
110
758
3.43
120
827
3.70
130
896
3.97
140
965
4.23
150
1034
4.50
Pressure vs Voltage Table
