•
Explosion-proof/flameproof meters:
-
24 VDC, 0.65 W typical, 1.1 W maximum
-
Minimum recommended voltage: 21.6 VDC with 1000 ft of 24 AWG (300 m of
0.20 mm
2
) power-supply cable
-
At startup, power source must provide a minimum of 0.5 A of short-term current
at a minimum of 19.6 V at the power-input terminals.
•
Intrinsically safe meters:
-
24 VDC, 0.7 W typical with 250
Ω
barrier, 0.96 W maximum with 250
Ω
barrier
-
Minimum recommended voltage: 22.8 VDC with 1000 ft of 22 AWG (300 m of
0.25 mm
2
) power-supply cable
Power cable recommendations for explosion-proof/flameproof meters
Minimum wire gauge (AWG per feet )
Figure 1-9:
300ft
600ft
900ft
1200ft
1500ft
1800ft
2100ft
2400ft
2700ft 3000ft
Distance of installation
2
1
.
6V
24
V
14
15
16
17
18
19
20
21
22
23
24
25
26
AWG Maximum
91.44m 182.88m 274.32m 365.76m 457.2m 548.64m 640.08m 731.52m 822.96m 914.4m
Planning
Installation Manual
7
