MST 5700 - Introduction

3
MODEL 5700
I. INTRODUCTION
The MST, Inc. Model 5700 Carbon Monoxide (CO) Monitor and Alarm is a side mounted, battery
powered unit. The monitor has been designed, and is certified by the Canadian Standards
Association (CSA LR-104195) to be INTRINSICALLY SAFE FOR USE IN CLASS 1, DIVISION
I, GROUPS A,B,C&D when used with two “9V” alkaline transistor type batteries. When the
monitor is powered by the same two “9V” alkaline batteries, the optional Alarm Repeater, (P/N
80444 - see accessories VI.A), is certified INTRINSICALLY SAFE under the same Certification No.
for the same Class/Div/Groups as mentioned above. An internal microprocessor controls the
indication and alarm functions in response to the indicator of an electrochemical CO Sensor.
It continuously monitors a compressed air sample introduced to its detector at an approximate rate
of 1.0 SCFH and it gives an alarm when:
! The CO in the sample exceeds a preset level (adjustable-initially set at 10 PPM; 5 PPM in
Canada).
! The battery voltage has diminished to a preset level (non-adjustable).
! There is a discontinuity in the detector circuit.
There are also indicators to show CO concentration and to verify that the instrument is on and
operating properly.
The components are assembled into a black powder-coated aluminum housing 6" H x 4" W x 2"
D overall. A hose barb, with plastic sample tube attached for introducing the sample gas, extends
from the bottom. Available at the front face are the OFF/ON/TEST switch, the display (LCD),
SPAN and ZERO adjustments.
The left side contains the indicating lights, the alarm buzzer, and the remote alarm jack. Accessible
on the right side are the two battery drawers and the auxiliary power jack.
These items are detailed below.