GDS GASMAX II User manual

AUTHORIZED DISTRIBUTOR - GasDetectorsUSA.com - Houston, Texas USA
Quickstart Guide
GASMAX II Gas Monitor with Remote
SmartIR Combustible Gas Sensor
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IMPORTANT - Before installing the GASMAX II,
make sure no toxic or combustible gases are
present. Declassify the area if necessary.
Air movement by fans, wind, gas density,
convection, emission sources and environmental
variables should be taken into account when
determining location. As with all sensors, the
GASMAX II should be protected from falling or
directed water, snow, shock, vibration and dirt.
Use installation practices approved for the
appropriate area classification. When installed with
#10-0247 Stainless Steel sensor head, the
GASMAX II is certified for use in areas rated Class
1, Div 1, Groups B, C & D.
Access the GASMAX II display assembly by
opening the explosion-proof cover and loosening
INSTALLATION
WIRING & INITIAL SETUP
CALIBRATION
After warm-up, follow the on-screen instructions to
calibrate the unit. When calibration is complete, the
GASMAX II will indicate CAL DELAY and then resume
normal operation.
GASMAX II Power Supply Board
the two thumbscrews. The power supply board is
attached to the rear of the enclosure.
Connect the GASMAX and remote sensor as shown
using shielded cable. Ground the shield on one end
only. Reinstall the GASMAX II display and cover.
Apply power and allow the instrument to warm up for a
minimum of one (1) hour. Readjust the sensor voltage to
4.5VDC as measured at the sensor junction box across
pins “R” and “A”.
Perform a balance adjustment as described in the
GASMAX manual.
TB1
TB2
S1
TP1
PW R OUT 4-20 “ECHEM”
OUT 4-20 “LEL”
GND
1 4 3 2
GASMAX I/O Power
Supply P/N 10-0233
COM
ACT REF
“CATBEAD”
C1 C2
C8 C7
S1 TB2
TB1
SW1
R
C
A
R
C
A
Remote SmartIR Sensor Assembly
R
C
A
R
C
A
Important:
Do NOT exceed 5.5V across remote sensor
terminals R & A with the sensor in place.
If moisture is present, do not install remote
sensor with unused inlet facing up.
- 832-615-3588

GASMAX II 4-20mA WIRING DIAGRAM
GASMAX II ISOLATED 4-20mA WIRING DIAGRAM
U1
TB3
K2 K3 K1
J1
1 2 4 3 5
A
B A S B
1 2 4 3 5 6 7 9 8
NO
C
NC
NO
C
NC
NO
C
NC
TB2
TB1
A B
+ -
Assy 10-0234
U1
TB3
K2 K3 K1
J1
1 2 4 3 5
A
B A S B
1 2 4 3 5 6 7 9 8
NO
C
NC
NO
C
NC
NO
C
NC
TB2
TB1
A B
+ -
Assy 10-0234
GASMAX II MODBUS® INTERFACE WIRING DIAGRAM
RS-485
MODBUS
MASTER
CONTROLLER
A
B
10-0234
MODBUS /
ALARM RELAY
BOARD
10-0234
MODBUS /
ALARM RELAY
BOARD
Notes:
1. Use MODBUS setup
menu to set each
RTU to unique
address (1-247)
2. Install terminating
resistor (J1-A) only on
last instrument in
MODBUS string.
3. TB2-1 connects to
TB2-4 and TB2-2
connects to TB2-5
internally.
4. TB2-3 is ‘no connect’
for cable shield
continuation.
S2
Ribbon to
1 2 4 3
TB2
1) PWR
2) OUT 4-20 “ECHEM”
3) OUT 4-20 “LEL”
4) GND
REF COM ACT
CATBEAD
S1
C7 C8
C1
C2
I/O Power
TB1 TB2
Detector Power (+)
Detector Common (-)
Channel 2 4-20mA (Bridge or 4-20 IN)
Channel 1 4-20mA (E-chem Input)
10-0233
I/O POWER
SUPPLY
BOARD
TB1
U8
4
3
1
2 Isolated 4-20mA output for Bridge or 4-20mA Input (Ch2)
Assy 10-0250
Isolated 4-20mA Output
+ + - -
Isolated 4-20mA output for E-chem Input (Ch 1)