ENMET MED AIR 2000, Operation And Maintenance Manual, Page: 8 / 30

ENMET Corporation M
ED
A
IR
2000
4
2.3 Circuit Board Features
The Display Panel is hinged on the right and is released by unscrewing the 2 thumb screws located in the left corners.
After releasing the panel, it is swung to the right, exposing the interior of the enclosure. The Circuit Board is mounted
on a plate at the back surface of the enclosure interior. Features are shown in
Figure 2 .
Feature Description
Terminal Strip This twenty-three position terminal is located at the bottom of the Circuit Board. On
it are twelve positions for three contacts for each of four alarm relays, and three
positions for the contacts of a fault relay.
There are also two positions for each of the 4-20 mA outputs. (optional)
Manifold Housing The sample manifold, the carbon monoxide and oxygen sensors are located under
this small aluminum housing. Not illustrated in figure 2, see
Figure 8 .
2.4 Power Supply
The power supply circuit is located on the bottom surface of the inside of the enclosure. The circuit is protected by
two 1.0 Amp fuses mounted in fuse holders on the power supply board.
2.5 Dew Point Sensor
If present in the instrument, the solid state dew point sensor is located on the plate to the right of the main circuit board.
2.6 Dew Point Circuit
If present in the instrument, the dew point circuit is located on the top surface of the inside of the enclosure.
Figure 2: M
ED
A
IR
2000 Interior Features
Humidifier
Tube
Cover, Humidifier Tube
Sensor O2
If Oxygen option is
installed
Sensor CO
Terminal Strip
Power Supply
PCB
Fuse Holder
Power Supply
PCB
Particulate
Filter
Audio Alarm
Sensor Dew Point
If Dew Point option
is installed