Quatrosense Environmental Ltd. (QEL)

Model QTS-6000 Series - Toxic Gas Transmitter/Sensors

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The QTS-6000 Series is the latest advancement in economical loop powered analog output toxic gas transmitters. This universal transmitter can be easily configured via solderless shorting links for any of a wide variety of plug-in electrochemical sensors.

The QTS-6000 Series is the latest advancement in economical analog output toxic gas transmitters. This universal transmitter can be easily configured via solderless shorting links for any of a wide variety of plug-in electrochemical sensors. The compact sensor elements have a typical life of two to three years, are easily field replaceable, and do not require electrolyte replenishment. With rapid response to target gas and stable zero readings, these sensors retain their sensitivity to gases such as H2S even after prolonged exposure to clean air. The two wire transmitters are available in a variety of ABS or explosion-proof Nema rated enclosures. The transmitter operates on a power supply range of 12-36 VDC with an output of 4-20 mA DC into 750 Ohms (at 24 VDC), making it useable with any standard intrinsic safety barrier. With integral RFI and EMI protection, this is the most robust transmitter available in its class.

Electrochemical gas sensors are micro-fuel cells designed to be maintenance free and stable for long periods. Gas continuously enters the self-contained cell through a flow limiting diffusion barrier. The target gas reacts within the electrolyte creating a microamp current flow between the electrodes. No fluid replenishment is required as these cells are not self-consuming.

They work by catalyzing the combustion of the target gas using atmospheric oxygen. The cell electrodes degrade with time, The QTS-6000 transmitter is powered by a nominal 24 VDC external power supply in a two-wire connection. It transmits through the same two wires a 4-20 mA DC signal over the calibrated range of the sensor selected. The transmitter is factory configured and calibrated for the sensor selected when ordered as a complete assembly. This universal transmitter accepts any of the listed sensors into a plug-in socket on the board, or an integrally mounted sensor assembly on the industrial enclosure. Solderless shorting links configure the board for a specific sensor type. Calibration is achieved through a simple zero and span adjustment using the appropriate calibration gases for the sensor installed.

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