Throughput and hose length of the sniffer probe have influence on the signal response time and displayed intensity. This is ideal for high special resolution of leak localization. For fast measurement one should use a sniffer probe with high gas throughput.
A sniffer probe should always be located as closely to the leak as possible. Sniffing velocity should be in the range of 1 cm per second. Since there is a time delay due to gas transport though the sniffer line the operator will have passed the leak once the maximum signal is displayed.
Sniffing test is regarded as localization method, not a quantitative one. Distance from the leak and tilt of the sniffer probe have an influence on the test result. However, one can also achieve quantitative results with sniffer probes.
VIC offers portable atmospheric sniffing leak detectors for both helium or helium/hydrogen applications. The MD-490S/Dual Gas utilizes VIC’s own industrial-grade mass spectrometer to achieve the highest sensitivity, fastest response-time, and smallest footprint.