Your contact person

Oppermann Regelgeräte GmbH
Email: info(at)
Phone:+49 711 727235-60
Fax: +49 711 7280527

Our extensive range of bus-compatible OPP-SOR® gas and CO warning systems and accessory bus-compatible OPP-SOR® gas sensors provides a wide selection for diverse applications, enabling us to find the right solution for each and every one of your requirements. The program is supplemented by conventional analog gas warning systems and gas sensors.

CO warning systems for underground garages and tunnels Type TGÜ-BM 3.6

The TGÜ-BM 3.6 is a bus-compatible measuring and control system for monitoring the air for toxic concentrations of carbon monoxide, nitrogen dioxide, propane or methane in underground garages or similar enclosed spaces in which motor vehicles with combustion engines are used. The integrated time switch allows cyclical ventilation independent of pollutant concentration. This can be optionally flanked with humidity control to avoid condensation problems. The TGÜ-BM 3.6 allows different types of gas sensors to be used simultaneously and can manage up to 240 sensors. If optional humidity sensors are used, the maximum number of gas sensors decreases from 60 to 58 per zone.


ABS plastic


340 x 234 x 141 mm (W x H x D)

Protection type:

IP 54

Alarm setpoints:

4 adjustable threshold values

averaging times freely selectable

hysteresis freely selectable

Alarm relays:

7 changeover relays 250 V/5 A je Zone

for ventilator 1, ventilator 2, ventilator 3,

horn, warning sign, malfunction, building management system (BMS)


external reset of horn

Supply voltage:

230 V AC 50/60Hz and 24 V DC

Permissible ambient conditions:

0 °C – 40 °C, 0 – 95% RH (noncondensing)

Optional UPS:

24 V DC (20 – 32 V DC)

Cable feed:

17 x M16 x 1.5, 2 x M20 x 1.5


Spring terminals 0,5 – 1,5 mm2




CE mark

VDI 2053 Sheet 1

Data transfer:


- to sensors

via RS485 interface, GMF Modbus

- to BMS

via RS485 interface Modbus RTU

- to LAN

via Ethernet interface TCP/IP (configuration only)


CO, NO2, LPG, methane and humidity

Gas warning systems

Gas warning devices are for monitoring rooms for toxic and flammable gases. For example, the max. permissible working place concentration, also referred to as the MAK or AGW value, or the lower explosive limit (UEG) of gases and vapors is monitored. Optical and acoustic alarm devices are triggered as soon as the adjusted threshold value is exceeded. This way people are warned in time and can leave the endangered area. Via additional floating contacts, the corresponding media lines can be closed, using, e.g., solenoid valves. Thus gas warning systems provide optimal protection to persons and technical equipment against the harmful effects of gases and vapors.

Gas sensors

Being bus-compatible, the OPP-SOR® gas sensors are connected to the control unit via a proprietary bus. This makes it possible to dispense with elaborate radial wiring, saving costs.

Different sensor technologies such as electrochemical, semiconductor, catalytic or infrared are used, depending on the task at hand and the gas to be detected.

Information for operators of gas and
CO warning systems

Initial start-up of gas warning systems, including those for CO, is performed on location by our service team. All gas sensors are tested in terms of their installation situation and function using the relevant target gas. Our start-up service also extends to peripheral components such as warning signs, horns, flashlights and any ventilation fans, all of which undergo functional testing based on the gas warning system’s alarm thresholds.

Calibration involves determining the gas sensor’s inherent deviation and whether this is still within the acceptable tolerance range.

If deviations are found during calibration, the gas sensor is adjusted by reference to predefined measurement points using fresh ambient air or zero gas. Then its measurement range is adjusted using target gas.

This generally involves a visual inspection of the entire gas or CO warning system and a check of the alarm thresholds including the triggering of connected devices such as ventilation valves, warning signs, etc. All required calibration and adjustment work is included. The maintenance report lists all conducted tests and documents the gas warning system’s operating condition. Any required service work and any deviations found are also documented.

Maintenance interval:
The maintenance interval is specified by the manufacturer of the gas or CO warning system. However, there may be regulations requiring other maintenance intervals for specific applications. It is the operator‘s responsibility to determine which requirements apply.


Information for operators of gas warning systems:

Operators may want to check the following regulatory material for any existing requirements or information on gas warning systems. It provides an (incomplete) overview of laws, ordinances and technical regulations concerning the use of gas warning systems.

German Federal Ministry of Justice

  • Occupational Health and Safety Law (ArbSchG)
  • Workplace Ordinance (ArbStättV)
  • Industrial Safety Ordinance (BetrSichV)
  • Hazardous Materials Ordinance (GefStoffV)


The Federal Institute for Occupational Safety and Health(

  • Technical Rules for Operating Safety (TRBS)
  • Technical Rules for Hazardous Materials (TRGS)
  • Manual on Hazard Assessment


Trade Association for the Raw Materials and Chemical Industry (

  • General information on compressed gases
  • Gas warning systems for toxic gases / vapors and oxygen (Information Sheet T021)
  • Gas warning systems and devices for explosion control (Information Sheet T023)
  • FAQ on gas warning systems and devices for explosion control (Information Sheet T055)


Further information for operators of
CO warning systems:

with a view to the requirement of having these approved at start-up by an independent certified inspector in accordance with the Model Testing Ordinance (MPrüfVO).

IS-ARGEBAU Conference of Construction Ministers (

  • Model Building Regulations (MBO)
  • Model Ordinance on Garages and Parking Spaces (MGarVO)
  • Model Testing Ordinance (MPrüfVO)
  • Rules for technical installation testing by inspectors certified by the building supervisory authorities in accordance with the Model Testing Ordinance (Model Testing Rules)


Verein deutscher Ingenieur e.V. (Association of German Engineers) (

  • Ventilation and air conditioning – garages –ventilation (VDI 2053 Sheet 1)



Installation frames for cabinet installation of the TGÜ-BM 3.6


Warning signs


Lights and horns


Uninterruptible power supply (UPS)


Power supply units



Data sheets

Gas and CO warning devices