GX-3R Gas Monitor


We now rent the smallest and lightest 4 gas monitor that is on the market! The GX-3R, manufactured by RKI Instruments, has revolutionized the clip-on gas monitor industry with their newest offering.

The GX-3R is the world’s smallest 4 gas monitor weighing only 3.52 ounces and can comfortably be clipped within a worker’s breathing zone (2.2” W x 2.55” H x 1.02” D). It simultaneously monitors and displays LEL combustibles, O2, CO (Hydrogen compensated CO also available), and H2S. The unit is also dust and water resistant and carries an IP66/68 rating.

OSHA defines the breathing zone as a ten-inch radius around the worker’s nose and mouth, and requires that worker exposure monitoring air samples be collected in the breathing zone. Air sampling filters may be attached to the collar or lapel. Traditionally this means only a single gas monitor would be small enough for a worker to practically wear a gas monitor ‘In the breathing zone’. Now there is a 4-gas monitor smaller than many single gas monitors

Safety supervisors will appreciate the non-compliance indicator. The instrument flashes it’s 3 LED lights every 30 seconds in the following conditions; if the instrument has not been bump tested, or if calibration is due, or if there was a gas alarm event. The 3 LED lights will continue to flash once every 30 seconds until the non-compliance condition has been resolved. The 30 second interval is adjustable.

Battery life can go all day in the field with up to 25 hours of operation (with the Lithium-ion battery). It has a very simple two button operation and the buttons are large so there is no issue pressing them with work gloves on. Alarm levels can also be adjusted to 3 different loudness settings. The RKI GX-3R also has audible, visual and vibration alarms to make sure you are notified of danger no matter your environment. RKI also warranties these units with a 3 year manufacturer’s warranty.

Popular accessories for this item are the SDM-3R calibration station and the RP-3R sampling pump. The SDM-3R calibration station allows you to charge, calibrate, bump test and alarm test your unit right in the field. The RP-3R clip-on sampling pump only roughly doubles the size of the monitor once it is attached and will allow up to a 100’ sampling range with attached tubing. The pump also has a separate power supply so as not to run your batteries down in the GX-3R monitor.

JM Test Systems is now offering this unit in our rental fleet which will come with a fresh 12 month calibration every time it is rented. In addition to rental, we also sell and service these monitors. Please give us a call today for current pricing and availability!

GX-3R Diagram