Product Description

The ATS***9TD Sensor/Transmitter operates on *4 VDC power and features LED alarm  indicators, ***0 mA output and optional alarm relay board. This sensor/transmitter can be connected to various applied controllers or computer-based instrumentation, such as PLC or similar instrumentation.
Combustible gas Sensor/Transmitter ****0%LEL
The Model ATS***9TD incorporates a pellistor or catalytic bead sensor. This sensor consists of a matched pair of elements, one active and the other for compensation. When in contact with a combustible hydrocarbon or solvent causes the gas or vapor to "burn" or oxidize at concentrations below the Lower Explosive Limit (LEL). This oxidization process raises the temperature of the active bead and increases the resistance of the internal wire coil. The second bead does not have the catalytic coating and provides compensation for environmental conditions including temperature and humidity. When these elements are connected to the circuit, a useable signal is produced that is proportional to the gas concentration.
Electrochemical Sensor/Transmitter for H₂, O₂, CO, H₂S and other Toxic Gases
The ATS***9TD Series Sensor/Transmitters utilize electrochemical type cells to detect the target gas. These cells consist of electrodes, electrolyte and an air/liquid separation barrier. Gas molecules enter the cell and, as a result of an oxidation/reduction reaction, generate an electrical current proportional to the gas concentration.
NDIR Hydrocarbon Sensor/ Transmitter
The ATS***9TD incorporates a sensor that operates on the NDIR principle to monitor the concentration of hydrocarbon gas. It can be calibrated for a specific gas, such as methane, but it also responds to some other hydrocarbon gases, including propane, butane, etc. The sensor features an integral semiconductor for temperature compensation, a durable tungsten filament IR light source, filter and a dual temperature-compensated pyroelectric infrared detector