When the SG500 senses the presence of gas it sends a 4-20mA signal to the detector proportional to the level of gas. The detector then operates a pre-alarm relay - used for remote sirens or visual indicators. If the level of gas continues to rise then the main alarm relay is activated to break the electrical supply to a safety shut off valve and is fixed at 20% LEL of natural gas.

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The SGM595 is a natural gas sensor. It provides a 4-20mA signal proportional to concentration of gas in air. The sensor is typically powered by, and sends a signal back to, a Duomo gas detector panel. The detector then interprets the signal and is capable of sounding alarms and turning off gas supplies to the protected area. The SGM595 has an automatic drift compensation function. This has made this item our most popular gas sensor.

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The SGM595 is a LPG sensor. It provides a 4-20mA signal proportional to concentration of gas in air. The sensor is typically powered by, and sends a signal back to, a Duomo gas detector panel. The detector then interprets the signal and is capable of sounding alarms and turning off LPG supplies to the protected area. The SGM595 has an automatic drift compensation function. This has made this item our most popular sensor.

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The HCF100 is a Freon 134a sensor. It provides a 4-20mA signal proportional to concentration of gas in air. The sensor is typically powered by, and sends a signal back to, a Duomo gas detector panel. The detector then interprets the signal and is capable of sounding alarms and turning off appliances in the protected area. The HCF100 has an automatic drift compensation function. This has made this item our most popular sensor.

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The probe SG895 is a pellistor gas sensing unit that detects the presence of methane, LPG and other types of gas. An automatic drift compensation function permits the probe to adapt to difficult ambiences and variable temperatures, avoiding false alarms due to anomalous events. The SG895 is ATEX certified and is therefore ideal for very high specification applications.

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The CO100Ar is an electrochemical sensor which provides a signal proportional to the levels of carbon monoxide in its vicinity. It then provides a 4-20mA signal back to any one of the Duomo detector panels listed above. This clever sensor also has a Time Weighted Average (TWA) function and can therefore provide a 4-20mA signal if the levels of gas stay above a lower concentration of gas for a given period e.g. 30ppm for 20 hours.

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The CO200 is a duct mounted, electrochemical sensor which provides a signal proportional to the levels of carbon monoxide in its vicinity. It then provides a 4-20mA signal back to any one of the Duomo detector panels listed above. This clever sensor also has a Time Weighted Average (TWA) function and can therefore provide a 4-20mA signal if the levels of gas stay above a lower concentration of gas for a given period e.g. 30ppm for 20 hours.

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