GDA-400 – controller for different sensors

GDA-400 with 4-20mA inputs

Four Channel Alarm Controller
  • Control system for up to 4 transmitters
  • Graphic LCD shows real-time monitoring
  • Complete calibration functionality
  • Non-volatile memory retains all configuration data
  • Optional discrete channel alarm relays


Bacharach’s GDA-400 controller is designed to provide simultaneous display and alarm functions for up to four fixed-system monitors with 4 to 20 mA inputs. Real-time data displayed on the LCD includes gas type and concentration, bar graphs and 30-minute trends.

The GDA-400 is equipped with a fault and three adjustable alarm levels per channel. Relay outputs allow control of audible and visual alarms, strobes, horns, and other alarm events. Options such as 4 to 20 mA or Modbus® RTU outputs and discrete alarm relays are easily added.



The system is dedicated primarily to cooperation with existing, installed gas sensors from different manufacturers.

In the case of design and installation of a new detection system, it is recommended to use MGS-500 or C3-NET sensors equipped with digital Modbus outputs, plugged to MC3 or ASIX control system.

The digital signal, unlike the analog 4-20 mA signal, is a non-modifiable and undeniable signal that guarantees above-average information security.



Type Four channel alarm controller
Inputs Four 4 to 20 mA
Display Backlight graphic LCD, 128 x 64 Pixel; 6 status LEDs
Power 100 to 240 VAC, 24 VDC
Alarm Relays, Common 2 Standard, SPDT
Rating: 5 A @ 30 VDC or 250 VAC, resistive load
Alarm Relays, Discrete 6 optional, SPDT
Rating: 5 A @ 30 VDC or 250 VAC, resistive load
Analog Outputs (Optional) Four 4 to 20 mA
Serial Port (Optional) Modbus RTU via RS 485
Temperature 13 to 122 ºF (-25 to +50 ºC)
Housing Options NEMA 4X / IP66; NEMA 7 optional
Dimensions 8.0” x 10.0” x 6.25” (210 x 255 x 160 mm)
Approvals CE Mark, CSA/UL Div 2 (Pending); NEMA 7: Div 1, Group B



Part Number Description
5700-0400 GDA-400 4 Channel Base Controller, NEMA 4X Enclosure

NOTE: One input card must be ordered with each controller

5700-0014 Optional 4 to 20 mA Input Card
5700-0020 Optional Bridge Sensor Input Card
5700-0015 Optional Alarm Relay Output Card
5700-0019 Optional 4 to 20 mA Output Card
5700-0017 Optional RS-232 / RS-485 Modbus® RTU Output Card
5700-0029 Optional 50 W Power Supply (Required if connected transmitters exceed 10 W)




GDA-400 DataSheet
GDA-400 Manual
GDA-400 Declaration of Conformity