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Specifications subject to change without notice. | GAGC06_E_0516 | USA 200303 | Page 4 of 41
DGC6 – UserManual
DGC6 Analog Gas Controller
1 Application
The PolyGard
®
2 DGC6 Gas Controller is used for monitoring, detection and warning of toxic and combustible gases
and vapors in the ambient air. The DGC6 Gas Controller fulfills the requirements according to the European Standard
EN 50545-1 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 DGC6 Gas Controller also meets the requirements
according to EN 378, VBG 20 and the guidelines “Safety requirements for ammonia (NH
3
) refrigeration systems”. The
Gas Controller can be used as well for monitoring other gases and measuring values.
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 EN 5502). The Gas Controller may only be used in
ambient conditions as specified in the technical datasheet.
The PolyGard
®
2 Gas Controller DGC6 must not be used in potentially explosive atmospheres.
2 Description
The Gas Controller is a measuring, warning and control system for the continuous monitoring of different toxic or
combustible gases and vapors as well as of Freon refrigerants. The DGC6 is suitable for the connection of up to 96
digital sensors like the DT6 Series via the 4-wire bus. Up to 32 analog inputs for the connection of sensors with 4 to
20 mA signal interface are available in addition. The controller can be employed as pure analog controller, as analog/
digital or as digital controller. The total number of connected sensors, however, may not exceed 128 sensors.
Up to four programmable alarm thresholds are available for each sensor. Each sensor alarm threshold can be
assigned up to one of the 32 power relays or up to one of the 96 signal relays. Relays have potential-free change-over
contacts.
The Gas Controller menu structure is very intuitive and simple to use. A number of integrated parameters allow
customized programming for various gas measuring scenarios. Configuration is menu-driven via the keypad. For faster
and easy configuration, you can use the PC based configuration software DGC6-EasyConf.
Prior to commissioning please consult the guidelines for wiring and commissioning of the hardware.
2.1 Normal Mode
In normal mode, the gas concentrations of the active sensors are continuously polled and displayed at the (liquid
crystal) LC display. In addition, the controller continuously monitors itself, its outputs and the communication to all
active sensors and modules.
2.2 Alarm Mode
If the gas concentration reaches or exceeds the programmed alarm threshold, the alarm is triggered, the assigned
alarm relay is activated and the alarm LED (orange for alarm 1, red for alarm 2 + n) starts to flash. The set alarm can
be read from the menu Alarm Status. When the gas concentration falls below the alarm threshold and programmed
hysteresis, the alarm is automatically reset. In latching mode, the alarm must be reset manually at the triggering device
after falling below the threshold. This function is required for combustible gases detected by catalytic bead sensors
generating a falling signal at too high gas concentrations.
