GFM 3.0

Gas Flow Meter 3.0 is a portable, explosion-proof, battery-powered instrument designed to measure the volumetric leak rate from various pipe fittings, compressor rod packing, wet/dry seals (off turbine compressors), main line suction and discharge valves, blowdown valves, pressure relief valves, emergency shutdown valves, storage tanks, vents and all other pipe connectors typically found at natural gas facilities.
This product contains an internal Class 1 laser system. Under normal operating conditions, no user-accessible laser radiation is present.
The GFM can quantify approximately 98–99% of fugitive methane emissions at a typical natural gas compressor station or similar facility. The leak rate is measured by high‑speed sampling to capture all gas escaping from the source while it is diluted with ambient air. Accurate measurement of both the sample flow rate and the natural gas concentration enables calculation of the leakage rate. The instrument automatically compensates for differences in gas content between the sample and the ambient air, ensuring accurate leakage‑rate calculations.
A compact laser detector with a wide operating temperature range of -40 to 140 °F (-40 to 60 °C) was selected for measuring natural gas concentration.

The sampler is mounted in a case attached to the harness, allowing the operator to keep both hands free when climbing ladders or entering confined spaces. The sampler can also be used without the harness.
The sampler is controlled wirelessly using an Android phone (version 6.0 or later), which displays technical information and control functions for the GFM. Its operating range is up to 15 ft. The metering unit consists of a structurally safe, high‑performance fan that draws air from the leakage area through a flexible hose into a gas manifold located inside the unit. The sample flow rate is determined by a flow meter that measures differential pressure.