ENMET SPECTRUM-RAL-DC - Manual (Page 8)

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2.0 Features and Operation
The features of the SPECTRUM-DC-RAL Carbon Monoxide monitor are shown in Figure 1. These
are:
DISPLAY an LCD upon which either the gas concentration, or prompts for the operational
and maintenance menus, are given.
PUSHBUTTON there are three of these, as follows:
SWITCHES
POWER/
BACKLIGHT the left hand switch
OPTION the middle switch
SELECT the right hand switch
These switches are used to access and utilize the operational and maintenance MENUS.
SENSOR a small cylindrical turret on the display surface; inside which the membrane of
HOUSING the electrochemical sensor is exposed to the compressed air through the air
supply line.
REGULATOR a pressure regulator with a gauge, flowmeter and an adjustable valve, connected
by tubing to the sensor housing. Available on some models per order.
VISUAL ALARM a red LED which is ON whenever the CO concentration is above the alarm
point.
AUDIO ALARM a small horn which is ON whenever the gas concentration is above the alarm
point, until the alarm is acknowledged. There are two variations of audio alarm
location, one with the alarm on a cable, the other with the alarm mounted on the
enclosure.
COVER retained with four screws, and removed to change the sensor and battery.
2.1 Installation and Operation
2.1.1 Installation
2.1.1.1 Mount Enclosure
Mount the enclosure at an appropriate location using the four mounting holes accessible inside the
enclosure. The location should be far enough upstream from the user that the sample air reaches the
monitor before the air reaches the user.