Where should a gas sensor be mounted?

Propane, butane and narcotic gases are heavier than air. They accumulate on the bottom of the car.
Thus a gas sensor should be mounted half way between floor and bed in a vertical surface.

What kind of gas will be detected?

Our gas sensors detect propane, butane and all narcotic gases. The G.A.S.-pro, depending on its equipment level, also carbon monoxide.

Which gases are gas detectors still reacting to? / False alarm?

Gas alarms are often said to be prone to false alarms.
Gas sensors react to bottled gas or anesthetic gas-like substances in certain concentrations.
Deodorants, aftershave, strong cleansing agents, body gases (especially by four-legged friends) or even breath alcohol or the fondue let a sensitive gas detector start.
Despite the temperature compensation, the continuous self-tests and the intelligent software evaluation of the measured values of the sensor, sometimes a false alarm is not excluded.

The reliability in case of emergency comes first:
Better once too often alarm than too little.

PS: Just the right mounting height simply filters out only bad gases (false alarms) decisively.

How does a gas attack work? Which gases are used?

In a robbery or attempted burglary with narcotic gases are often used chemicals from wholesalers. Chloroform or ether are known, but also substances e.g. used in plastics production. In large containers they cost little money and rarely require an identity card.
In the interior, using an injection cannula the liquid chemical passes through through rubber seals or forced ventilation and evaporates there at room temperature to a gas mixture. This fills the vehicle from bottom to top and puts nocturnal sleeping people in a half-sleep.
This half-sleep allows burglars to apply a much higher noise level while still being undetected.

Acoustic error messages of G.A.S-pro

The G.A.S.-pro has a permanent self-test and is capable of detecting and reporting faults in the wiring, defects in the software or in the gas sensor itself.
An incorrectly connected or mechanically defective gas sensor will result in a sensor error, as demonstrated below.
Irregular one, two or three beep sounds may indicate a variance in the quality of the sensor and is often remedied by a free software update of the G.A.S.-pro main unit. Please contact us: kontakt@thitronik.de .

How does a sensor failure of G.A.S.-pro sound like?

Failure sensor 1

Failure sensor 2

Failure sensor 3

What to do on a sensor failure?

Please check wiring using the terminal diagram.

If the fault is not in the wiring, please contact your dealer or our technical hotline +49 (0) 431 66 66 8 11.

How can you test a gas detector?

Please not with a propane gas bottle! And also methylated spirits or similar are not suitable, but may even damage the sensor head.
A test can be carried out safely with a commercial lighter, should even be done regularly. With a lighter with electronic ignition, simply blow out the flame.

Extension of the sensor cable?

The extension of the sensor cable is possible up to a maximum of 8m. Please use cable of the same (3x0,14) or larger cross section.

Why is the G.A.S.-pro constantly beeping after installation?

When installing the G.A.S.-pro in confined spaces, it is often overlooked that there is an input for terminal 15 (ignition) in the terminal block. Thus, if the sensor is connected to all lines one position too far to the left (green to IGN, and so on) the main unit will not be able to detect any sensors and report this with the continuous beeping.
The "wrong" picture shows the typical error picture with the used screw heads.

Assignment of sensor cable colors of older devices

Signal Cable color new Cable color old
GND white black
Ub brown brown
Sensor green blue

Frequently asked questions/FAQ