The Regard 3900 is a standalone, autonomous control system for up to 16 measuring channels. It is fully configurable and monitors the concentration of toxic gases, oxygen and combustible gases and vapors.
Up to four 4-20-mA transmitters each can be connected to a maximum of four input modules in 2/3 wire technology. Each input module is equipped with three relays. These change-over relays are designed as collective alarms for the corresponding module for the messages “Fault”, “1st alarm” and “2nd alarm”. The two alarms are fully configurable and can be set up as rising or falling and latching or non-latching. In addition, the Regard 3900 can be equipped with two relay modules. Each of these modules has eight relays. The first relay is always configured as a failure relay and cannot be changed. The other seven relays can be configured as individual, collective or group alarms. They can either operate as a operating current relay or a standby current relay. Depending on the application and the connected transmitters a third gas alarm and an additional alert can be configured. The alarm relays are acknowledged by operating a key at the front of the control unit.