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© 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual
Rev. B | 2021.08
6.7.1 Analog Wire Gauge vs Run Length
The table below shows the
maximum cable length between the cGas Detector
and the Controller
for normal installations (a separate signal line from the
controller for each cGas Detector is required).
SUPPLY
VOLTAGE
MAXIMUM LOAD
(Wire +
Termination
Resistor) (ohms)
WIRE GAUGE
(AWG)
MAXIMUM
CABLE LENGTH
(feet)
24 VDC
592 (assume a
500 Ω termination
resistor)
18
7,100
16
10,700
14
20,000
16 VDC
216 (assume a
200 Ω termination
resistor)
18
1,200
16
1,800
14
3,500
24 VAC
1,060 (assume a
500 Ω termination
resistor)
18
43,200
16
65,500
14
100,000
12 VAC
316 (assume a
200 Ω termination
resistor)
18
8,900
16
13,583
14
25,000
NOTE:
The termination resistor could be as high as 500 Ω (10-volt
measurement at 20 mA). A poor quality 24 VAC transformer might supply as
little as 14 volts at low line conditions.
