User Manual

ENMET Corporation ISA 200 RAL (O)

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

NC C NO NC C NO NC C NO NC C NO NC C NO CO- CO+ DP- DP+ O2- O2+

FLOW

Figure 2: ISA-200 RAL(O) Interior Features

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

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