GASMAX II Operation & Maintenance Manual, Revision 7.0
Page 10
For maximum protection against RF interference or electrical surge, the GASMAX II enclosure, all remote
sensors and interconnecting conduit must be properly grounded.
CAUTION
: KEEP EXPLOSION PROOF COVER TIGHT WHILE CIRCUITS ARE ALIVE
MISE EN GARDE :
GARDER EXPLOSION COUVERTURE PREUVE TIGHT CIRCUITS PENDANT QUE
SONT ALIVE
INTRINSICALLY SAFE INSTALLATION
The GASMAX II is not certified for use as an Intrinsically Safe device. Any GASMAX II that does not include
a flame arrestor in the sensor should be used in general purpose areas only.
CONNECTING DC POWER & OUTPUT SIGNAL WIRING
To access the GASMAX signal and power connections, remove the cover on the GASMAX II explosion-
proof enclosure, loosen the 2 thumbscrews holding the display assembly and remove it. The display will
remain connected to the IO/Power Supply PCB mounted in the back of the enclosure by a short ribbon
cable. Route the power and signal wires through the conduit entry and connect to
terminal block “
TB2
”.
Plus 24VDC connects to TB2-1. DC Ground connects to TB2-4. Channel One 4-20mA output is available on
TB2-2 and Channel Two 4-20mA output is available on TB2-3.
GDS Corp always recommends using shielded wire for signal and power cable.
Figure 3-1: GASMAX II Power & Signal Wiring
ibbon to isplay
I Power upply
Bridge ensor
C
M
C
T
P
T
T
G
TB
TB
TB2
–
1: +12-30VDC Input
TB2
–
2: Channel 1 (4-20mA Out)
TB2
–
3: Channel 2 (4-20mA Out)
TB2
–
4: Power / Signal Common
NOTE: The maximum distance 4-20 mA signals can
travel is dependent upon cable gauge, DC power
supply voltage level and input impedance of the
receiving device. Assuming a nominal 24 VDC
power supply, the maximum total loop resistance
is approximately 750 ohms.
Examples:
#18GA, 0.0064 ohm/ft => 11 miles
#24GA, 0.026 ohms/ft => 2.7 miles
Содержание GASMAX II
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