Bacharach HGM-SZ Specifications download pdf (Page 18)

Single Zone Gas Monitor

14 P/N: 3015-4256 Rev 13

2.7. Connecting External Alarms

2.7.1. Overview

The SZ monitor includes four SPDT relays whose contacts are rated 2 A at 250 VAC (inductive) and 5 A

at 250 VAC (resistive). These relays are used for the connection of external alarm devices that are

activated when the relay is energized. The relays are factory assigned to energize under the following

conditions:

Relay #1 Leak Alarm Point 100 ppm

Relay #2 Spill Alarm Point 300 ppm

Relay #3 Evacuate Alarm Point 500 ppm

Relay #4 Fault System Fault Event

NOTE: Alarm points of relays #1, #2, and #3 are set using the monitor’s LEAKLVL,

SPILLLVL, and EVACLVL function screens (page 22).

2.7.2. Connection

Use any of the service knockouts to gain cable access to the interior of the monitor. Locate the External

Alarm Relay Connector (page 11). Secure the leads from the external alarm device and its power source

to the connector as shown in the diagram below.

Figure 2-8. External Alarm Relay Connector

Each relay may be connected as normally open (NO), or normally closed (NC).

The relay contacts are rated 2 A at 250 VAC (inductive) and 5 A at 250 VAC (resistive).

Power for the alarm devices connected to the relay contacts may be supplied by an external 24 V DC

power source or the monitor’s AC input terminals.

In Figure 2-9, power to this device is being tapped off the monitor’s AC input. In Figure 2-10, power is

supplied from an external power source

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Bacharach HGM-SZ Specifications Page 18