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QTS - 6000 TOXIC TRANSMITTER/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 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.

GAS SELECTION TABLE

Enlarge Picture

GAS TYPE

#

RANGE**

TEMP°C*

Transmitter Only 000 NONE -40 to +50
Hydrogen Sulfide - H2S 110   0 - 25 ppm -20 to +50
Hydrogen Cyanide - HCN 115   0 - 20 ppm -20 to +50
Chlorine - Cl2 120   0 - 3 ppm -20 to +50
Chlorine Dioxide - CIO2 123   0 - 1 ppm -20 to +50
Hydrogen Chloride - HCI 125   0 - 10 ppm -20 to +50
Sulfur Dioxide - SO2 140   0 - 6 ppm -20 to +50
Nitrogen Dioxide - NO2 150   0 - 6 ppm -20 to +50
Carbon Monoxide - CO 160   0 - 250 ppm -20 to +50
Nitric Oxide - NO 190   0 - 100 ppm -20 to +50
Hydrogen - H2 211   0 - 2000 ppm -20 to +50
Ammonia - NH3 220   0 - 50 ppm -25 to +30
Ozone - O3 240   0 - 3 ppm -20 to +50

 


* Temperature operating range given in degrees Celsius.
** Standard ranges, please inquire for other possible ranges.

 

PRINCIPLE OF OPERATION

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, resulting in typical life span of 2 to 3 years.

The QTS-6000 transmitter is powered by a nominal 24 VDC external power supply in a two-wired 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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Last Updated 03/18/10