A new handheld device can detect the presence of explosive methane gas from up to 100 feet away. For firefighters, the tool provides situational awareness, saves time, and ensures safety from a distance. Knowing the presence of methane gas enables a firefighter to deal with an emergency gas leak and to avoid a deadly explosion.
Gas laser
The Gas Laser from Teledyne Gas and Flame Detection can shoot a laser beam through a window, a gap in a door, or another common venting point to provide an instant reading of the amount of methane in an area up to 100 feet away. The laser is invisible, but a green-spot pointer guides the aim as a user “points and shoots.”
The laser bounces off any reflective object and then analyses the parts per million (ppm) of methane gas per meter of distance along the path of the laser. It measures down to a threshold of 1.25 ppm/meter.
The handheld device can also capture a video image and a GPS location in addition to the gas reading stored on the device. It can be connected via WiFi and/or Bluetooth to a smartphone or other device and has onboard data logging. The device is automatically calibrated and tested when it is returned to its case.
Detects minute quantities of methane
Gas laser detects a much smaller amount of methane than would be explosive, thus preventing explosions
“It’s a brand new device, and everybody wants it,” says Alan Skinner, Regional Manager, Portable Gas Detection for Teledyne Gas and Flame Detection. “Once they understand what it does, they want it. Now you don’t have to be inside a hazard to detect the hazard.”
The Gas Laser detects a much smaller amount of methane than would be explosive, thus preventing explosions by addressing leaks early. The lower explosive limit (LEL) for methane is 5 percent, the equivalent of 50,000 ppm, much higher than the measurement threshold of the Gas Laser. Previously, there was no entirely safe method of evaluating the gas concentration without being near an area, typically using a three-foot probe sensor, for example.
“Now they know what they are getting into before they enter,” says Skinner. “It saves a huge amount of time.”
Understanding working of gas laser
Getting the word out about the device has been a challenge given the continuing coronavirus pandemic and disruptions of the hurricane season. “It’s one of those products you have to show them and let them play with it to understand what it does,” says Skinner. Interest was high at the recent FDIC show, where Teledyne unveiled the new sensor alongside its broader range of gas detection sensors.
Teledyne’s range of portable sensors traces its roots back to GM Instruments (GMI), founded in Scotland in 1947. The sensor company was involved in multiple mergers and acquisitions in recent years, including ownership by companies such as Battery Ventures, Tyco, Scott Instruments, Johnson Controls, and 3M.
Two years ago, the product line was acquired by Teledyne and represents the portables segment of their Environmental Monitoring Division, which also includes Detcon, Simtronics, and Oldham.
Protege ZM and PS200 sensor
PS200 sensor measures levels of four gases – methane, oxygen, carbon monoxide, and hydrogen sulfide
Another sensor among Teledyne’s range of handheld devices is the Protégé ZM, a carbon monoxide sensor that a fireman can clip to their helmet, pocket, or bag. The “disposable” device has a 24-month lifespan, requires zero maintenance, and provides a calibration and bump test.
The PS200 sensor measures levels of four gases – methane, oxygen, carbon monoxide, and hydrogen sulfide. An internal pump extracts a sample before a firefighter enters a confined space. A charge, bump, and calibration station (ABC Station) ensures calibration on a weekly, monthly, or twice-yearly basis.
PS500 and GT Fire sensor
The PS500 model adds another sensor to the four – typically either a photoionization detector (PID) for volatile organic compounds such as benzene, or a hydrogen cyanide (HCN) sensor to measure the presence of carcinogenic compounds that can be a byproduct of burning vinyl or plastics. The PID sensor can help investigators detect propellants that might indicate arson.
The GT Fire sensor detects explosive gases in the PPM/LEL ranges with optional CO, H2S, and O2 sensors. The device can sniff out small gas leaks before any LEL level is reached. Able to find leaks in the PPM range, the device can pinpoint exactly where gas is leaking.
