Trace analyzer WATCHDOG

oxygen

The AMI Watchdog provides a set of desirable features that are needed for trace oxygen analysis at a remarkably low cost. On the face of it, you might think that all you really need is the oxygen sensor, an off-the-shelf cell block and a single range amplifier so that you can plug it into your SCADA system or flow computer. What could possibly go wrong? As many people have discovered, there is more to it than just that. A trace oxygen analyzer is an excellent leak detector. The tiniest leak, due to improper assembly or incorrect choice of sample system components, will render trace oxygen readings meaningless. The sample system has to be able to provide a controlled flow both of the measurement sample and a span gas and also allow the sensor to be replaced rapidly (excessive exposure to air can damage or destroy a trace oxygen sensor). The electronics has to be able to deal with the wide range of possible oxygen readings from under 1ppm to 20.9% and accurately compensate for temperature variations. The Watchdog provides all of this – and extensive electronic capabilities - at a very low cost. Trace oxygen analyzers like the Watchdog are essentially leak detectors. AMI’s patented cell block allows the analyzer to be built with almost no possibility of internal leaking, with minimal wetted volume and with front-panel sensor access. All sample handling components – the flow meter, needle valve and a four-way sample/span/off selection valve – are integrated into a solid metal block. Connections between them are drilled passages.