detcon inc.
Detcon
Model 812B
Rack Mount Control Enclosure
Operator’s Installation & Instruction Manual
March 1, 1999 Document #2079 Ver. 1.1
ALARM 3
ALARM 2
ALARM 1
FAULT
ALARM
RESET/
Test
HOUSTON, TEXAS
detcon inc .
able
disable
ALARM
MODEL 12B
HYDROGEN
SULFIDE
MONITOR
ppm H2S
ALARM 3
ALARM 2
ALARM 1
FAULT
ALARM
RESET/
Test
HOUSTON, TEXAS
detcon inc .
able
disable
ALARM
MODEL 12B
HYDROGEN
SULFIDE
MONITOR
ppm H2S
ALARM 3
ALARM 2
ALARM 1
FAULT
ALARM
RESET/
Test
HOUSTON, TEXAS
detcon inc .
able
disable
ALARM
MODEL 12B
HYDROGEN
SULFIDE
MONITOR
ppm H2S
ALARM 3
ALARM 2
ALARM 1
FAULT
ALARM
RESET/
Test
HOUSTON, TEXAS
detcon inc .
able
disable
ALARM
MODEL 12B
HYDROGEN
SULFIDE
MONITOR
ppm H2S
ALARM 3
ALARM 2
ALARM 1
FAULT
ALARM
RESET/
Test
HOUSTON, TEXAS
detcon inc .
able
disable
ALARM
MODEL 12B
HYDROGEN
SULFIDE
MONITOR
ppm H2S
ALARM 3
ALARM 2
ALARM 1
FAULT
ALARM
RESET/
Test
HOUSTON, TEXAS
detcon inc .
able
disable
ALARM
MODEL 12B
HYDROGEN
SULFIDE
MONITOR
ppm H2S
ALARM 3
ALARM 2
ALARM 1
FAULT
ALARM
RESET/
Test
HOUSTON, TEXAS
detcon inc .
able
disable
ALARM
MODEL 12B
HYDROGEN
SULFIDE
MONITOR
ppm H2S
ALARM 3
ALARM 2
ALARM 1
FAULT
ALARM
RESET/
Test
HOUSTON, TEXAS
detcon inc .
able
disable
ALARM
MODEL 12B
HYDROGEN
SULFIDE
MONITOR
ppm H2S
HOUSTON, TEXAS
detcon inc.
POWER
ON/OFF
FUSE
2 AMP
Model
PS80-12B
FUSE
PRESS
M
odel
812B
HOUSTON, TEXAS
detcon inc.
Table of Contents
1.0 Introduction
1.1 Description
1.2 Specifications
1.3 Schematics
1.4 Installation
1.5 Start-up
1.6 Maintenance & Repair
1.7 Spare Parts List
1.8 Warranty
1.0 INTRODUCTION
Detcon Model 812B consists of 3 major assemblies:
1. The NEMA 1 rack mount control enclosure.
2. The single channel digital control modules.
3. The remote mount gas sensor assemblies.
The NEMA 1 control enclosure is detailed in section 1.0 of the manual, the control modules in section, 2.0 and
applicable sensor assemblies in section 3.0.
1.1 D
ESCRIPTION
Detcon Model 812B rack mount control enclosure, along with Model 12B digital control modules, is designed to
serve as a host assembly for up to eight remote mount gas detection sensor assemblies. The control enclosure is
rated NEMA 1 suitable for installation in non-hazardous locations.
The single channel modular design supports application f lexibility wherein multiple function gas detection systems
can be configured in any combination up to eight channels. All control modules are plug-in front panel accessible
for easy maintenance and repair. The system is powered by VAC line power and/or 24VDC unless otherwise specified at time of order.
The control enclosure houses a modular power supply (Model PS80-12B) which includes, as standard operating controls, a power on/off switch and a line power fuse. Discreet output terminal strips located on the controller motherboard are provided for sensor terminations, Form C dry contact alarm outputs for three alarms plus fault (common
and choice of normally open or normally closed), 4-20 mA outputs for remote recording devices, and RS-485 serial
Modbus™ output. Additional terminations are provided for VAC power in, VDC power in, and remote alarm reset.
The Form C relay outputs, may be discreet, zoned, or common by gold plated jumper tabs located on the controller mother board.
1.2 SPECIFICATIONS
Electrical Classification
NEMA 1
Dimensions
19''W x 7''H x 8.75''D
Capacity
8 single channels
Power Input
117VAC/24VDC
PPoowweerr CCoonnssuummppttiioonn
5 watts per channel (full alarm peak load)
Model 812B Rack Mount Control Enclosure PG.2
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