SenSmart 6900 DUAL Gas Detector

Dual gas detectors support the use of two smart sensors including electrochemical, catalytic bead, infrared and photoionization sensors. 

The state-of-the-art SenSmart 6900 gas detector is built with our proven ‘ST-44’ transmitter and has an RS-485 remote sensor option with a range of up to 4000 feet. 

This versatile unit also has a bright, vivid color LCD display and embedded Ethernet with Webserver and Modbus TCP.

Dual gas detectors from RC Systems can be equipped with one or more different sensors based on your application requirements. 

We offer electromechanical sensors, catalytic bead sensors, infrared sensors and photoionization sensors for monitoring a range of toxic and combustible gases and vapors.

Electrochemical sensors are typically used for monitoring oxygen and toxic gas levels and feature two or more electrodes and an electrolyte. 

As gas diffuses into the sensor, it is oxidized or reduced. This action results in a current that is measured by the electrode to produce a reading. 

Electrochemical sensors have excellent accuracy and repeatability but can also be sensitive to humidity and temperature variations. 

Because of this, RC Systems takes pride in helping you with your specific application to better understand how to best utilize our electrochemical gas detectors.

Catalytic bead sensors are used for the monitoring of combustible gases and feature two platinum wire coils that are embedded in beads of alumina and connected to a Wheatstone bridge electrical circuit. 

To detect the presence of combustible gas, one of the pellistors in the sensor contains a catalyst that oxidizes the gas upon contact. Catalytic bead sensors are highly reliable and can be used with any type of combustible gas. 

They are also suitable for use in high humidity and extreme temperature environments, and around vibrating machinery.

Infrared (IR) sensors feature an infrared light source, optical filter and optical receiver measure gas levels by transmitting infrared light. 

The most common application is to detect the presence of hydrocarbon vapors and other combustible gases, though they may also be used for oxygen monitoring. 

If gas is present, it interferes with the transmission of the infrared light. This change is then detected by the receiver, which determines the gas level by measuring the energy difference.

Infrared sensors remain operational in various temperatures and humidity levels and can withstand pressure. They also remain functional in oxygen-deficient environments and the sensors do not wear with repeated exposure to gas. 

These characteristics make infrared dual gas detectors suitable for use in mining applications and other hazardous environments.

Photoionization sensors are used in dual gas detectors to measure volatile organic compounds typically found in fuels, solvents, degreasers and other items frequently used in manufacturing and waste handling. 

The photoionization sensors contain high-energy UV photons that break molecules into positively charged ions that produce a current as they enter the sensor. 

Higher concentrations of gas produce a larger number of ions, which creates a larger current that triggers a reading to display on the dual gas detector screen.