Sierra Monitor Corporation 2350-00, 2360-00 User Manual

Sierra Monitor Corporation

1991 Tarob Court, Milpitas, CA 95035

[phone]
[phone]

[phone] - Fax

E-mail: [e-mail]

Web Site: www.sierramonitor.com

GAS MONITOR

Model 2350-00
Model 2360-00

APPLICABILITY & EFFECTIVITY

This manual provides instructions for the following Sierra Monitor products:

Model Description

2350-00 Gas Monitor - Toxic Only
2360-00 Gas Monitor - Toxic & Combustible

The instructions are effective for the above models as of March 1, 1999

Instruction Manual Part Number: T10011

Rev. B

TABLE OF CONTENTS

Instruction Manual

SECTION PAGE

1.0 PRODUCT DESCRIPTION 1

1.1 Introduction 1

1.2 General Description 2

1.2.1. Mechanical 2

1.2.2. Alarm Relays 3

1.2.3. Alarm Indicators 4

1.2.4. Test Switches 4

2.0 INSTALLATION 5

2.1 Unpacking and Inspection 5

2.2 Installation & Set-Up 5

2.2.1. Enclosure Mounting 5

2.2.2. Interface Wiring 5

2.2.3. Start-Up 5

3.0 OPERATION 6

3.1 Status Indication 6

3.2 Function Tests 6

4.0 CALIBRATION 7

4.1 Frequency of Calibration 7

4.2 Calibration Procedure 7

4.3 Maintenance 7

5.0 SPECIFICATIONS & SPARE PARTS 8

6.0 WARRANTY 9

Instruction Manual

1.0 PRODUCT DESCRIPTION

1.1 INTRODUCTION

The Model 2350 and 2360 series Gas Monitors provide continuous monitoring of Methane (and other Combustibles)
and Carbon Monoxide gas simultaneously in a confined space to provide safety for personnel and to reduce the hazard
of gas explosion. Both models are designed to operate from a -48 VDC power source typically available in telephone
equipment applications. The monitors are designed for use primarily in telephone equipment cabinets.

Model 2350 has one sensor which is factory calibrated to detect Carbon Monoxide at 100 PPM and has cross sensitivity
to Hydrogen and Methane (CH4). Model 2360 has both a Carbon Monoxide sensor factory calibrated to 100 PPM
Carbon Monoxide and a Combustible Gas sensor calibrated to 5,000 PPM Methane.

Models 2360-00 (figure 1.1) and 2350-00 (figure 1.2) are designed for installation in a customer supplied three position
electrical junction box.

Features of the Models 2350 and 2360 include:

w Local visual and audible alarms.
w Ambient temperature change compensation.
w Long-life solid state gas and temperature sensors.
w -48 VDC operation.
w Five alarm relay contacts (2360), four alarm relay contacts (2350).
w User selectable active or passive relay alarm test.
w Single PC board assembly for easy installation and maintenance.
w Alarm test contacts on PC board.
w Fused vent relay.

Model 2350 / 2360 Gas Monitor (3/99)

Figure 1.1

Model 2360-00

Page:

1

Instruction Manual

Figure 1.2

Model 2350-00

1.2 GENERAL DESCRIPTION

1.2.1. MECHANICAL

The Gas Monitor is comprised of a printed circuit assembly mounted behind a flat cover plate which serves as the
instrument cover when installed into a user supplied, three position electrical gang box (figure 1.3).

Electrical connections for power (-48 VDC) and relays (dry contact alarm activated) are made via screw terminals on the
printed circuit board prior to installation into the gang box.

Calibration adjustment potentiometers are accessible through the cover plate.

• SENSORS: Gas and temperature compensating sensors are installed onto the printed circuit assembly

and are protected by the cover plate. The sensors can be replaced by removal of the monitor from the
gangbox. The Combustible and Carbon Monoxide sensors are metal-oxide semiconductor type solid state
devices for long life. The electrical resistance of the sensors is inversely proportional to the gas concen­tration.

• CONNECTORS: All user connections are made via convenient multi-position screw terminal strip

Page:

2

located on the component side of the printed circuit assembly. Wiring access to the monitor can be
determined by the installer by selecting any hub knockout on the gang box.

Model 2350 / 2360 Gas Monitor (3/99)