Sierra Monitor Corporation 55, T10008 User Manual

INSTRUCTION MANUAL

OXYGEN DEFICIENCY MONITOR

(Model 55)

T10008

Rev A1

TABLE OF CONTENTS

1.

Introduction....................................................................................................1

2. Features.........................................................................................................2

3. Mechanical Description..................................................................................3

4. Alarms............................................................................................................4

5. Operation.......................................................................................................6

6. Calibration......................................................................................................7

7. Sensor Replacement .....................................................................................8

8. Battery Replacement ...................................................................................10

9. Remote Sensor Option................................................................................11

10. Specifications...............................................................................................13

11. Limited Warranty..........................................................................................16

OXYGEN DEFICIENCY MONITOR PAGE 1

1. Introduction

1.1 The SMC Model 55 is a portable oxygen efficiency monitor for
personnel in confined work places. It is self-contained, light
weight and battery operated. It does not require any adjustments
by the user other than routine calibrations. The monitor reads
true percent oxygen in the presence of any diluents including
humidity and will not be affected appreciably by barometric
pressure changes caused by elevation or weather changes.

OXYGEN DEFICIENCY MONITOR PAGE 1

2. Features

2.1 Features of the Model 55 include:

• Temperature Stable

• Barometric Pressure Insensitive

• Large LCD digital display

• High accuracy over temperature range 0-50

o

C

• Fast response -90% full scale in 10 seconds

• Visual Alarm – LED provided on top of case

• External Earphone for noisy environments

• Single ON/OFF sliding switch

• Long Battery Life – 200 hours on a 9V battery

• Low Battery indication – visual display

• Small Size – Comfortable for belt water

OXYGEN DEFICIENCY MONITOR PAGE 2

3. Mechanical Description

3.1 The Model 55 is housed in a rugged, high impact enclosre. The
sliding ON/OFF power switch is located on the left side, the
calibration potentiometer is accessible on the right side and the
digital display is on the front surface. The top of the monitor and
the digital display is on the front surface. The top of the monitor
contains the sensor opening, jacks for earphone and remote
sensor , the alarm LED and audible alarms. See Figure 1.

3.2 Located on the back surface of the monitor are a belt clip and the
battery cover.

OXYGEN DEFICIENCY MONITOR PAGE 3

4. Alarms

4.1 LOW OXYGEN CODITION: When the % oxygen falls below 19.5
(factory set) the digital display will be augmented by an audible
alarm when using either internal or external sensor. The red LED
will also truno on to provide visual indication. If an earphone is in
use the alarm will only sound through the earphone.

4.2 LOW BATTERY VOLTAGE: When the battery voltage falls below

3.6 volts, the warning “BAT” will display in the upper left corner.

4.3 LOW SENSOR OUTPUT: Sensor failure will be indicated by
abnormally low, unadjustable, reading on the LCD display.

OXYGEN DEFICIENCY MONITOR PAGE 4