Section 1
ZGARD C Controllers
General Information
The ZGARD C Controllers are microprocessor-based monitoring systems designed to interface with remote
gas sensors and perform user configured control functions for surveillance, activate ventilation equipment,
personnel alert or alarm indication. The controllers feature audible and visual status indicators with relay
outputs. MSA ZGARD S or GS sensor-transmitters are available to detect a wide variety of gases including
Carbon Monoxide, Carbon Dioxide, Nitrogen Dioxide and Refrigerants.
The table below provides the distinctive features of the ZGARD C Controllers. This is a quick guide for
determining the functionally, capability and configuration of each controller.
ZGARD C CONTROLLER MODEL
1 CHANNEL
4 CHANNEL
Number of Remote Sensors
1 4
Power LED (Green)
Yes None
Digital Readout
1 + 3 digits
1 + 3 digits
Audible Alarm
Solid ON /
Variable,
(Jumper H1-6)
Solid ON /
Variable,
(Jumper H1-6)
Relay Mode, Energized
De-Energized
YES
(Jumper H1-3)
YES
(Jumper H1-3)
Time Delay
5 min. ON/OFF
(Jumper H1-5 IN)
OR
0-10 min., Pots
(H1-5 OUT)
5 min. ON/OFF
(Jumper H1-5 IN)
OR
0-10 min., Pots
(H1-5 OUT)
Warning Set Points
Pot (H1-7 IN)
OR
35% FS
(H1-7 OUT)
Pot (H1-7 IN)
OR
35% FS
(H1-7 OUT)
Alarm Set Points
Pot (H1-8 IN)
OR
50% FS
(H1-8 OUT)
Pot (H1-8 IN)
OR
50% FS
(H1-8 OUT)
Alarm Relay Latching
YES
(Jumper H1-9)
YES
(Jumper H1-9)
Optional Analogue Output
4-20mA
(Hi-Select)
4-20mA
(Hi-Select)
1.0