Enmet ISA-44-RAL-OD Instrukcja Użytkownika Pobierz pdf (Strona 10)

ENMET Corporation ISA-44RAL-OD / ISA-44RAH-OD

3.2 Internal Electronic Circuitry

Figure 2 shows the circuit board and terminal blocks housed inside the hinged oiltight control unit. Specific relays and

adjustments are defined:

INTERNAL RELAY CONTACTS: Relays can be used to activate an external remote alarm system when a hazardous CO level

is detected. These are double-pole relays (Figure 2 upper right) with terminals "normally open"(N.O.), "normally

closed"(N.C.), and "common"(COM.) (See Figure 3 and Section 4.0 for relay contact hook-up). There is one relay for

each alarm level (2 alarm levels for CO, 1 for oxygen).

NOTE: Relay contacts are shown in the de-energized state (power off).

NOTE: If you want the relays to activate auxiliary equipment when the power to the control unit is interrupted, you

must connect the relays to an external power source. See Figure 3a.

POTENTIOMETERS: The unit has 9 potentiometers. These adjust critical circuit resistances and are essential to calibration

procedures.

Figure 2: Circuit Board with Terminal Blocks

TB1

Relay

K 1

TB2

Relay

K 2

Relay

K 3

TB3

TP4

DC-Gnd

Relay

High Level

Relay

Low LevelLights

DC Ground

MOS Sensor

O2 Relay

O2 Cell

115 VAC

Power

Terminal

Cover

Case

Ground

TP5

TP1

TP2

TP3

CO Meter

–

O2 Meter

–

O2 Meter

DC Ground

Purge

+12 VDC

High Level

Alarm Set

Low Level

Alarm Set

Meter

Adjust

Purge Adjust

Heater

Adjust

Low Level Set

O2 Alarm Set

Meter Full Scale Adjust

Null Adjust

Green

Amber

Red

N.O.

N.C.

COM

N.O.

N.C.

COM

Green

N.O.

N.C.

Amber

Black

White

–

Green

White

Black

Fuse

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 27 28

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