Detcon 612B User Manual

detcon inc.

Detcon

Model 612B

Rack Mount Control Enclosure

Operator’s Installation & Instruction Manual

April 1, 2000 Document #2304 Ver. 1.0

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

Model

612B

HOUSTON, TEXAS

detcon inc.

Table of Contents

1.0 Introduction

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 INTRODUCTION

Detcon Model 612B 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 DESCRIPTION

Detcon Model 612B rack mount control enclosure, along with Model 12B digital control modules, is designed to
serve as a host assembly for up to six 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 six 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 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. 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

11.5''W x 7''H x 8.75''D

Capacity

6 single channels

Power Input

24VDC

PPoowweerr CCoonnssuummppttiioonn

5 watts per channel (full alarm peak load)

OOuuttppuuttss

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

Model 612B Rack Mount Control Enclosure PG.2

AAllaarrmm RReellaayyss

(discrete or zoned)

Contacts include common with jumper selectable choice (on controller) of normally-open or normally-closed for four alarms

Resistive load: 5A, 250 VAC; 5A, 30 VDC
Inductive load: 2A, 250 VAC; 2A, 30 VDC
Max. operating current: 5A

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-40°F to +175°F

WWaarrrraannttyy

One year

1.3 SCHEMATIC

A

B

C

D

E

F

H

J

K

L

M

N

P

R

S

T

U

V

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

VDC IN

mA

Sensor

NO/NC

Com

Alm 3

NO/NC

Com

Alm 2

NO/NC

Com

Alm 1

NO/NC

Com

Fault

4-20mA

Out

Typical

Connector

x 6

Typical

Jumpers

x 5

CH6

CH 5

P6 thru P1

A (+)

B (–)

Shld

RS-485

Typ. x 6

Alarm
Reset

P8

P7

RS-485 Connectors

CH1 & CH6 only

Model 612B Rack Mount Control Enclosure PG.3

1.4 INSTALLATION

1. Securely mount the 612B enclosure in accordance with the drawing in figure 1.

NNoottee::

Reference figure 2 for wiring terminations.

2. Connect 24VDC input to the terminal strip labeled “VDC IN” (+ and —).

3. Refer to installation and wiring detail of remote mount sensor assemblies as detailed in section 3.0. Terminate
field wiring from sensors to the 612B motherboard. Terminals are labeled “SENSOR” (MA, + and —).

4. If applicable, terminate the discrete 4-20 mA output to external device(s). Terminals are labeled “4-20 mA OUT”
(+ and —).

5. If applicable, terminate the RS-485 serial output to external device(s). Terminals are labeled “RS-485” (A+, B–,
and Shield). RS-485 outputs may be common or zoned (max two zones) via the gold-plated jumper tabs.

6. Based on the application and use of relay contact outputs, complete all wiring terminations prior to application
of power. Shut-in controls may be omitted until system test is complete. Terminals are labeled “ALARM 1”,
“ALARM 2”, “ALARM 3”, and “FAULT” (COM & NO/NC). Relay contact outputs may be discreet or zoned
via the gold-plated jumper tabs.

7. If applicable, terminate a remote mounted normally open momentary switch to the terminations labeled “Alarm
Reset”. Activation of the alarm reset function will reset the alarms of all Model 12B controllers. The reset func­tion is effective when the Model 12B’s respective alarms have been programmed in the latching position and
alarm conditions have passed. Each Model 12B controller has its own alarm reset switch which is discussed fur­ther in section 2.0.

Model 612B Rack Mount Control Enclosure PG.4

Figure 1

Panel cutout (centered) 10 x 6.65

Panel depth - 8.75

3

7

.375

.218

Slot Detail
use 10-32 screw

11.5

1.5 START UP

Upon completion of all field wiring apply 24VDC power. Note that each Model 12B controller’s digital display illu­minates. Varying readings may occur during sensor warm-up. A 10 second alarm delay will occur on power up.
Refer to sections 2.0 and 3.0 for additional start-up detail.

1.6 SPARE PARTS LIST

0224 Gold plated jumper tab

1.7 WARRANT Y

Detcon Inc., as manufacturer, warrants under intended normal use each new Model 612B rack mount control
enclosure to be free from defects in material and workmanship for a period of one year. The warranty period begins
from the date of shipment to the original purchaser and ends one year thereafter. All warranties and service policies
are FOB the Detcon Inc. facility located in The Woodlands, Texas.

Model 612B Rack Mount Control Enclosure PG.5

4-20 mA Output

Typical

Each Channel

24 VDC In

COM

NO/NC

COM

NO/NC

COM

NO/NC

COM

NO/NC

mA

Fault Alarm

High Alarm

Low Alarm

HI-HI Alarm

S

B

A

Sensor

RS-485

COM

NO/NC

COM

NO/NC

COM

NO/NC

COM

NO/NC

mA

S

B

A

Zone Programming Jumpers

COM

NO/NC

COM

NO/NC

COM

NO/NC

COM

NO/NC

mA

S

B

A

Channel 1

Channel 5Channel 6

Control Terminals

Figure 2

Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands, Texas 7381

Mailing Address: P.O. Box 8067, The Woodlands, Texas 77387-8067

phone [phone] • fax [phone] • www.detcon.com • [e-mail]