Protecting from the invisible danger: gas detectors from Compur Monitors

We focus on your safety

Nothing matters more to us than your safety. As a medium – sized company we are particularly close to our customers. Our mission is to provide gas detection for your safety.

In this context our entire team stands for first class advice, first class products and first class service. Wer have been manufacturing high – end gas detectors and gas warning systems ever since the 1970s and therefore look back to a bunch of experience in whatever has to do with measuring the concentration of toxic or combustible gases.

Gas detectors must be installed wherever legislation or local safety standards require to monitor potentially dangerous atmosphere. As soon as the alarm threshold limit value – TLV is exceeded, they generate a visible and audible alarm. Being alert at the presence of toxic or combustible gases increases as well plant safety, personal safety and industrial hygiene. Professional gas detection improves industial health and safety and contributes to protect the environment and thus reduces cost. Any identification of a leakage is a significant cost reduction in terms of protecting buildings, plants and other assets. It will also save cost for cooling or heating, and avoids absence of personnel due to illness.

In any respect the operator of a plant is responsible for its safe and reliable function. Industrial standard gas detection without any compromise is an important tool to achieve maximum safety and minimum down time.

Examples for fixed systems:

Statox 505

The stationary gas detection system compliant with SIL 2 standard

Statox 560

The stationary gas detection system compliant with SIL 2 standard plus self test with the target gas


Statox 503

The fixed gas detection system for toxic and combustible gases. The Statox 503 Controller operates with 4 – 20 mA transmitters as well as with catalytic sensors.

It complies with SIL 2 requirements, even if operated as stand – alone unit. Therefore it can also be used together with front ends of other suppliers.


Statox 501 Infratox

The fixed gas detection system for combustible gases uses the infrared absorption method of gas detection. It features on site display and non intrusive one- man calibration. The reliability of this system is unmatched. The standard measuring range is normally 0 – 100 % LEL, or 0 – 2 or 0 – 5 %vol. CO2.


Statox 501 IR LC

The low – cost version fixed gas detection system for combustible gases uses the infrared absorption method of gas detection in. The Statox 501 IR LC sensor heads are backward compatible to systems using catalytic sensors. They can be used to upgrade such systems without replacing existing hardware.

Frequently asked questions

Yes, all of our gas detectors either have a pressure-proof encapsulation, enhanced safety or they are intrinsically safe. Explosion – proof design is a must to make sure an instrument cannot be a source of ignition. Explosion – proof design of instrumentation contributes significantly to a higher degree of plant safety.

The Ex p (pressure proof) protection concept encapsulates the sensing element behind a flamme barrier, so that even a combustion inside cannot cause an ignition on the outside.

Ex i protection concept (intrinsic safety) limits the consumtion of energy, the total capacity and inductivity of the instrument. Thus no component can heat up and no spark can be generated.

Yes, we do have three product families for the detection of toxic gases. Potentially poisonous gases are measured in the ppm or the ppb range, depending on their alarm threshold limit – TLV. Compur Monitors particular strength is in applications where extremely toxic gases must be detected. These gases do have a very low alarm threshold limit and therefore require sensors which are very specific and sensitive. Typical examples are: Chlorine, Hydrogen Cyanide, Phosgene, Nitrogen Dioxide, Sulphur Dioxide, Hydrogen Flouride, Hydrogen Chloride and many more.

Yes, our gas detectors for combustible gases are designed for the detection in the LEL range. The typical measuring range would be 0 – 100 % LEL (Lower Explosion Limit). In special applications it might be lower. The Infratox family has an on – site display, the ARE HRC MC IR family does not.

Yes, we offer two product families with infrared sensor technology. These gas detectors can measure hydrocarbons or carbon dioxide. The typical mesuring range would be 0 – 100 % LEL and 0 – 2 or 0 – 5 % vol. CO2. Custom – made ranges upon request.

Yes, most our gas detector for toxic gases are equipped with electrochemical sensors. Electrochemical sensors do have the advantage to be very specific. This will avoid false alarms. More or less these sensors operate as a gas – driven battery: Gas in – current out. They provide utmost measurement accuracy and low detectable limit. The range varies in the low ppm range or even in the ppb range.

Compur Monitors is manufacturing their own sensors, therefore our know – how in sensor technology is very good.

No question, if the plant manager gets immediate information if there is gas present, he can take countermeasures in time. Our gas detectors of course contribute significantly to safety in the plant. Exact measurement of the concentration provides reliable information about potential dangers. Based on this information the appropriate measure can be taken. This may be just an alert, but it can also mean that plant must be evacuated or even shut down.

Regular inspection of detector for toxic gases, combustible gases gases or oxygen deficiency guarantees, that the accuracy we deliver ex works is maintained over a long period of usage.

The right gas detector for your gas and your application

Compur Monitors is manufacturer of high – end gas detectors, as well fixed and portable. Most instruments comply with functional safety requirements level SIL 2. Highly sensitive and specific sensor technology makes sure that no deviation in ambient air quality can endanger the health of personnel or the environment. Highly specific sensors reduce the risk of false alarms to nearly zero.  Elaborate selection and positioning of gas detectors protect the ambience in the chemical, energy, pharmaceutical, food and oil industry, but also in greenhouses, wastewater treatment, drinking water supply, airports, hospitals, malls and machinery compartments. We, the manufacturer of gas detection systems, provide best accuracy of measurement in the LEL as well as in the ppm or even ppb range. No matter if you need to detect toxic gases, combustible gases, VOC or even multiple gases simultaneously, we provide the appropriate sensor technology: catalytic, (Cat) infrared (IR), photoionization (PID) or electrochemical (EC).

Important: Sensor positioning

Stationary gas detectors monitor hazardous areas around the clock. As point monitors can only detect gas in their vicinity, it is important to position them in a strategic manner: Close to potential leakages such as valves flanges, pumps and vessels, but also spread well in the plant. Sensors for gases with higher specific density than air should be placed close to the floor (protect from rain splash – back!), sensors for gases with lower density should be located close to the ceiling. Our instruments feature high intrusion protection ratings, so that they can be used as well indoors as outdoors. Perfect personal protection provide our multi gas detectors. Its optional sampling system can aspirate gas from a distance of more than 20 m.

The lifehood of gas detection is functional safety

Gas detector must be proof – tested or calibrated in regular time intervals by trained and authorized personnel. We provide useful tools for bump – testing, such as the Compur gas generator, but also appropriate calibration equipment and accessories. The latest member of the gas detector family is the Statox 560. With its built – in gas generator it can perform an automatic self – test every 24 hours. In case of a problem, our instruments will generate an alarm with absolute reliability.