Drager Regard 3900 Controller Series

  • 16 channels
  • Wall-mounted or rail-mounted
  • Approvals SIL 1/2 & ATEX

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The Drager Regard 3900 series devices can be used as standalone controllers. You can configure up to 16 measuring channels. Also, the modular setup enables you to customise the control units to the demands of your plant. You can also embed further features to existing alarms.

Input modules

You can connect up to four 4 to 20 mA transmitters with two or three-core cables to an input module. Up to a total of four input modules per controller can be installed. Each module is populated with three relays. These relays offer common “Fault”, “Alarm 1”, and “Alarm 2” SPOC outputs. Also, the two-alarm levels are fully configurable and can be set as rising or falling and latching or non-latching. A third alarm is possible by using the relay module.

Relay module

You can add two relay modules to the controller of the Regard 3900 series. Each module is populated with eight relays. The first relay is dedicated as a “Fault” relay and cannot be reconfigured. The remaining seven relays can be configured as “Single”, “Common”, or “Voting” alarms. The relay module offers an additional “Alarm 3” and a second fault threshold. You acknowledge the alarm relays via the push buttons on the front panel. The relays work with open-circuit current or close current.

Output module (Repeater module)

Each 4 to 20 mA output repeats the signal of up to eight inputs. This allows the indication or recording of gas levels by other control units. You can install up to two analogue output modules.


You can configure your control unit quickly and easily with the configuration software Config 3900 via laptop or PC. The configuration is prepared offline and uploaded during the commissioning for new installations. For maintenance, you can download the system configuration for a check. You can get the necessary cable as an accessory. By using the push buttons on the front panel, the REGARD 3920 can be easily adjusted. The configuration menu is easy to understand.

Mounting and installation

​The robust housing of REGARD 3900 and 3920 is dust-tight and protected against water jets (IP 65). Thus, these control units can be installed in a safe area. The REGARD 3910 is equipped with a built-in display and backplane. You can easily mount it into a cabinet. The modules can be installed there as well.

Gateway solution

​The REGARD 3900 Modbus gateway is an interface that converts a CAN bus protocol into a Modbus RTU protocol. Due to this factor, the gateway allows communication between the control unit of the REGARD 3900 series (CAN bus) with RVP 3900 (Remote Visualisation Panel) or other systems (Modbus RTU). Other possible gateways are Modbus TCPIP and PROFIBUS gateway. You can use these to transfer data to third-party control systems.

  • 4 LEDs per channel (function, fault, alarm one, alarm two)
  • Power supply external 24 VDC. Internal 110/240 VAC, 50/60 Hz
  • Sizes: Regard 3900/ 3920: 420 x 300 x 190 mm. Regard 3910: 300 x 225 x 20 mm. Weight approx 3kg, dependent on the installed power supply
  • Operating temperature 0 to 55 °C

Order Information

4208780 Basic Unit
4208810 (1x 4 to 20 mA Input Module + 1x Relay Module)
4208811 (1x 4 to 20 mA Input Module + 2x Relay Module)
4208812 (2x 4 to 20 mA Input Module + 0x Relay Module)
4208813 (2x 4 to 20 mA Input Module + 1x Relay Module)
4208814 (2x 4 to 20 mA Input Module + 2x Relay Module)
4208815 (3x 4 to 20 mA Input Module + 0x Relay Module)
4208816 (3x 4 to 20 mA Input Module + 1x Relay Module)
4208817 (4x 4 to 20 mA Input Module + 0x Relay Module)


4208830 Display Board
4208831 Mounting Plate for Modules


4208850 Basic Unit

REGARD 3900/3910/3920 Module

4208782 3900/3910/3920 4 to 20 mA Input Module
4208784 3900/3910/3920 Relay Module
4208797 3900/3910/3920 4 to 20 mA Output/Repeater Module

REGARD 3900/3910/3920 Accessories

SC00083 Modbus Gateway
AG01100 3900/3910/3920 PROFIBUS® DP Gateway
SD13037 3900/3910/3920 Modbus TCPIP Gateway
4208745 3900/3910/3920 PSU 2,5 A
4208746 3900/3910/3920 PSU 5 A
4208747 3900/3910/3920 PSU 10 A
4208785 3900/3910/3920 CAN Interface
SC00083 3900/3910/3920 Modbus RTU
SC00084 3900/3920 Gateway Cable
SC00085 3910 Gateway Cable

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Title Size
Regard-3900-series 145 KB

Additional information

Weight 0.09 kg