ENMET ISA-M - Manual (Page 4)

ENMET Corporation ISA – M
2
2.0 Features if the 2.0 Features if the ISA – M
2.1 External Feature of the ISA – M
Figure 1 shows the ISA-M control unit which contains the electronic circuitry and controls. Main features are listed below.
Feature Description
Meter This is a non-linear device. Do not infer exact readings from unmarked regions of the meter
scale.
The scale is marked in units of measure for the gas depending on instrument calibration.
§ PPM (Parts Per Million) for toxic gases
§ % LEL (Lowest Explosive Level) for combustible gases
Operation Switch A rotary switch for:
§
OPERATE – Normal Operation
§
HORN OFF – Disable Audio Alarm
§
PURGE ON – (sensor temperature control) Purge ON to clean (purge) sensor surface of
absorbed contaminants (sensor hot).
Switch Indicator
(Red) When the light is on, Indicates OPERATION SWITCH is not in OPERATE
Audio Alarm(Horn) Audio alarm (2900 Hz, 95 dB at 2 ft.). The audio alarm is activated when the unit is in alarm.
Power Indicator
(Green) When the light is on, the unit is operating and is not in alarm.
When this light is off, the unit is in alarm OR power to the unit has been interrupted.
Visual Alarms Amber: Visual alarm (steady light). When this lamp is on, power to the unit is on and the unit
is in low alarm.
Red: Visual alarm (steady light). When this lamp is on, power to the unit is on and the unit is
in high alarm.
Figure 1: External Features of the ISA – M
Switch Indicator
(Red)
Operation Switch
Meter
Audio Alarm
(Horn)
Visual Alarm
(Amber)
Power Indicator
(Green)
Visual Alarm
(Red)
Power Cord