ENMET ISA-200-RAL (O) - Manual (Page 8)

ENMET Corporation ISA 200 RAL (O)
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.
2.3 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.
05217-001 Ass'y Rev
N C C N O N C C N O N C C N O N C C N O N C C N O C O - C O + D P - D P + O 2 - O 2 +
1
F
L
O
W
Figure 2: ISA-200 RAL(O) Interior Features
1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3
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