GDS GASMAX II + -IR Quick Start Manual

Quickstart Guide

GASMAX II + GDS-IR Gas Monitor
INSTALLATION
IMPORTANT - Before installing the GASMAX II + GDS-IR,
make sure there are no toxic or combustible gases present.
Declassify the area if necessary.
Factors such as air movement by fans, prevailing winds,
convection, gas density, emission sources and environmental
variables should be taken into account when determining sensor
location. As with all sensors, the GASMAX II + GDS-IR should be
protected from falling or directed water, shock, vibration and dirt.
The GDS-IR sensor may be mounted either horizontally or
vertically (preferred). If mounted horizontally, make sure the GDS-
IR is protected from dripping water.
Use conduit and installation practices approved for the area
classification. When installed correctly, the GASMAX II + GDS-IR
is certified for use in areas rated Class 1, Div 1, Groups B, C & D.
POWER & 4-20mA WIRING
The GASMAX II power supply board is attached to the inside of
the explosion-proof housing (see Figure 1).
Connect the +DC power wire to TB2 pin 1. Connect the –DC
power to TB2 pin 4. DC voltage range is 18 to 30 VDC.
The 4-20mA output signal is available at TB2 pin 3. If an optional
toxic sensor is also connected to the GASMAX II, the toxic sensor
4-20mA output is available on TB2 pin 2.
Optional Relay / RS-485 DIGITAL WIRING
The optional GASMAX II Alarm Relay / MODBUS interface board
is attached to the back of the GASMAX II display assembly.
RS-485 MODBUS wiring should be attached to TB2 pins 1 & 2.
Attach the signal shield wire to TB2 pin 3. NOTE: RS-485 is
polarity-sensitive and the wires on pins 1 & 2 may need to be
swapped for proper operation. If wiring in a "daisy chain", terminals
4 & 5 are available for outgoing RS-485 wiring.
If necessary, select Jumper 1 (J1) position "A" to enable the RS-
485 termination resistor. This is typically done on the device
furthest from the RS-485 master controller.
Wiring for the three alarm relays is available on TB1. The normally
open, common and normally closed contacts are rated at 5A /
125VAC. Inductive loads should be protected by a reverse biased
diode or other transient suppression device.
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sales@GasDetectorsUSA.com
I/O Power Supply
1 2 3 4
Ribbon to Display
TB2
Fig 1. GASMAX II Power Supply Board
Remote Alarm Reset
TB1
NO 1
C
2
Relay 1
NC
3
NO
4
C 5
Relay 2
6
NC
NO 7
Relay 3 C
8
NC
9
Fig 2. GASMAX II Alarm / MODBUS Board
- 832-615-3588
C2 C1
CATBEAD
Assy 10-0233
S2
TB1
C8 C7
S1
- +
TB3
Assy 10-0234
TB2
A
1
K1 U1
B
2
S
3
J1
A
4
B
5
K2
J1-A - Installs RS-485
Termination Resistor
K3
J1-B - Omits RS-485
RS-485 "A" & "B" terminals are
connected internally. "S" is no-
connect for shield continuation
A
B