GASSONIC OBSERVER-i
83
8.2.1. Electrical Specifications
Cable Requirements: 3-wire shielded cable. Maximum distance between Gassonic Observer-i and
power source @ 24 VDC nominal with alarm relay energized and 20 mA source.
Voltage Normal
mA
Peak Alarm
mA
15 198 300
20 146 217
24 125 103
25 120 184
30 100 161
35 87 148
Table 30: Current vs. Input Voltage
AWG mm
2
Ohms per Km Ohms k feet
10 5.27 3.28 1.00
12 3.31 5.21 1.59
14 2.08 8.29 2.53
16 1.31 13.2 4.01
18 0.823 20.95 6.39
20 0.519 33.31 10.15
Table 31: Resistance of Copper Wire
Based on a 24 volt supply and 15 volts at the Gassonic Observer-i the recommended wire sizes are
shown below.
AWG mm
2
FEET METERS
10 5.27 15000 4573
12 3.31 9434 2880
14 2.08 5928 1809
16 1.31 2347 1136
18 0.823 2347 715
20 0.519 1478 450
Table 32: 24 VDC Cable Lengths
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