GASMAX II Operation & Maintenance Manual, Revision 7.0
Page 22
GASMAX DUAL 4-20MA OR 4-20MA + BRIDGE INPUT OPTION
The GASMAX II can be factory configured to support two general purpose, non-isolated 4-20mA inputs on
channels 1 and 2 (10-0233-D4), or one non-isolated 4-20mA input on Channel 1 and one BRIDGE input on
Channel 2 (10-0233-B4). Power Supply boards designed for dual 4-20mA inputs will have TB1 marked to
indicate PWR (+24V), 4-20 IN 2 (signal), COM (ground) and 4-20 IN 2 (signal). The amount of voltage and
current available for the remote 4-20mA device is determined by the GASMAX DC supply connected to
TB2.
WARNING:
DO NOT CONNECT A BRIDGE SENSOR TO TB1 IF THE INPUT HAS BEEN CONFIGURED FOR
4-20MA. THE +24V EXCITATION VOLTAGE WILL DESTROY THE BRIDGE SENSOR.
The most common usage for dual 4-20mA inputs is for use with local or remote GDS-IR Infrared
Combustible Sensors or GDS-49 Remote Toxic Sensor Transmitters.
Figure 3-15: Dual 4-20mA Input Option
ibbon to isplay
I Power upply
-
-
P
I
C
M
P
T
T
G
TB
TB
I
TB2
1. +24VDC Supply
2. Channel 1 4-20mA Out
3. Channel 2 4-20mA Out
4. Power / Signal Common
TB1 (10-0233-D4)
1. +24VDC
2. Channel 2 Analog In
3. Common
4. Channel 1 Analog In
TB1 (10-0233-B4)
.” ” terminal for cat
bead
. “C” terminal for cat bead
. “ ” terminal for cat bead
4. Channel 1 4-20 Analog In
10-0233-D4
Dual 4-20mA Input
10-0233-B4
4-20mA In / Bridge In
Содержание GASMAX II
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