Detcon 1212B User Manual

Page 2

Table of Contents

1.0Introduction

1.1 Description

1.2 Specifications
1.3 Schematic
1.4 Installation
1.5 Start-up
1.6 Spare Parts List
1.7 Warranty

1.0 I

NTRODUCTION

Detcon Model 1212B 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 1212B rack mount control enclosure, along with Model 12B digital control modules, is designed to
serve as a host assembly for up to twelve 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 flexibility wherein multiple function gas detection systems
can be configured in any combination up to twelve channels. All control modules are plug-in front panel accessible
for easy maintenance and repair.

The system is powered by 24VDC unless otherwise specified at time of order. Discreet output terminal strips locat-
ed 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. Terminations are also provided for remote alarm reset.

The RS-485 serial output, as well as the Form C relay outputs, may be discreet, zoned, or common by gold plated
jumper tabs located on the controller mother board.

1.2 S

PECIFICATIONS

Electrical Classification

NEMA 1

Dimensions

19''W x 7''H x 8.75''D

Capacity

12 single channels

Power Input

24VDC

weerr C

nssu

pttiio

5 watts per channel (full alarm peak load)

uttp

uttss

Discrete Analog 4-20 mA DC
Common or zoned (max two zones) Serial RS-485 Modbus™

Model 1212B Rack Mount Control Enclosure PG.2