Bacharach 3015-4256 User Manual

10 

Instruction 3015-4256 

The HGMSZ includes four SPDT relays whose contacts are rated 3 A at 240 VAC. 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 that the alarm points of relays #1, #2, and #3 are set using the monitor’s LEAKLVL, SPILLLVL, 

and EVACLVL function screens (Page 17). 

 

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

alarm relay connector (Page 8) and remove it from the circuit board. Secure the leads from the external 
alarm device and its power source to the connector as shown in the diagram below. When you are through 

securing the connections, carefully plug the connector back onto the circuit board. 
The second diagram on Page 11 shows a typical connection to Relay 1. Note how power to the alarm device 
is being tapped off the monitor’s AC input. 
 

 
 

 
 
 

 
 
 

 
 

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

The relay contacts are rated 3 A at 250 VAC. 

Power for the external alarm devices may be supplied from an external power source, or from  
the monitor’s AC input terminal strip.