SenseLine ELDS series open-path gas detectors

SenseLine ELDS (enhanced laser diode spectroscopy) series open-path gas detectors feature the manufacturer’s patented Simu-Gas technology, which eliminates in-field gas testing and allows users to perform remote, on-command, functional testing of the detectors from a programmable logic controller (PLC) at a control center or from a PDA. Simu-Gas controls both the synthesis of laser diode drive waveforms in a transmitter and the recognition of “harmonic fingerprints” by a receiver. Unique harmonic fingerprints are produced when a target gas in the monitored path absorbs the transmitter’s laser diode radiation. When the receiver recognizes the fingerprint, it calculates and then displays the quantity of the target gas. The accuracy of the gas detector is confirmed by comparing the gas reading on the receiver to the quantity of target gas simulated by the transmitter. Testing can be performed at any desired frequency with automatic data logging, and without having to physically access individual gas detectors or handle hazardous gas cylinders.