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MGC2 – UserManual
PolyGard
®
is a registered trademark of MSR-Electronic GmbH
MGC2 Analog Gas Controller
1 Application
The PolyGard
®
MGC2 Gas Controller is used for monitoring and warning of toxic and combustible gases and vapors
in the ambient air. The MGC2 Gas Controller fulfills the requirements according to VDI 2053 (January 04), ÖNORM
and NVN 2443 for the stationary monitoring of carbon monoxide (CO), nitrogen dioxide (NO
2
) and combustible gases
in underground garages, tunnels, go-cart race courses etc. The MGC2 Gas Controller also fulfills the requirements
according to EN 378, VBG 20 and the guidelines “Safety requirements for ammonia refrigeration systems”. The Gas
Controller can be used as well for monitoring lot of other gases.
The intended sites are all areas being directly connected to the public low voltage supply, e.g. residential, commercial
and industrial ranges as well as small enterprises (according to EN55 02). The Gas Controller may only be used in
ambient conditions as specified in the Technical Data.
The PolyGard
®
Gas Controller MGC2 must not be used in potentially explosive atmospheres.
2 Description
The Gas Controller is a measuring and warning controller for the continuous monitoring of different toxic or
combustible gases and vapors as well as freons. The MGC2 is suitable for the connection of up to 24 analog
transmitters.
Up to five free programmable alarm thresholds are available for each transmitter. For transmitting the alarms there are
up to 30 relays with potential-free, change-over, dry contacts.
Comfortable and easy operation of the Gas Controller is done via the logical menu structure. A number of integrated
parameters enables the realization of various requirements in the gas measuring technique. Configuration is menu-
driven via the user-friendly keypad.
Prior to commissioning please consider the guidelines for wiring and commissioning for hardware.
2.1 Normal Mode
In normal mode, the gas concentrations of the active transmitters are continuously polled and displayed at the LCD
display in a scrolling way. The Controller also monitors the communication to all active transmitters and modules.
2.2 Alarm Mode
If the gas concentration reaches the programmed alarm threshold, the alarm is started, the assigned alarm relay
activated and the alarm LED (orange for alarm1, red for alarm 2 + n) starts to flash. The alarming sensor number can
be read from the menu Alarm Status. When the gas concentration falls below the alarm threshold and hysteresis, the
alarm is automatically reset. In latching mode, the alarm has to be reset manually in the menu Relay Status or via a
digital input.
2.3 Fault Mode
If the Controller detects an incorrect communication at an active transmitter or module, or if a signal is outside the
admissible range (< 3 mA - > 22 mA), the assigned fault relay will trip and cause the Fault LED to flash. The error is
displayed in the menu Error Status in clear text.
After removal of the cause, the error message must be acknowledged manually in the menu Error Status.
