Gas monitors need working sensors to detect hazardous gases. Each device has at least one gas sensor that triggers an alarm when exposed to hazardous gases, such as methane, carbon monoxide, combustibles, and oxygen. These sensors are the heart of any gas monitor, whether you’re using a single gas, 4-gas monitor or multi-gas monitor, detecting 5 or more gases. The technology packed into these is impressive. 

We stock and sell a wide variety of replacement sensors, including those from BW Technologies by Honeywell, RAE Systems, RKI Instruments, mPower Electronics, and AimSafety. Our factory-trained and certified technicians can help you choose the correct sensor for your specific device. We even handle the installation at our service center. Shop additional gas detector accessories to meet your gas detection needs.


How do I reset my gas monitor?

You can reset your gas monitor by recalibrating the sensor using the instructions in the user manual. If you have recently installed a replacement gas sensor or had your sensor replaced, it is important to ensure that you recalibrate the monitor before using it again. 

To recalibrate, zero the gas detector using the manufacturer's guidelines. The meter should show a value of zero when complete. Connect the monitor to a gas regulator and test gas cylinder using the sample hose. Ensure the gas type listed on the cylinder matches the target gas on the monitor. Compare the readings on the display to the concentration listed on the test cylinder to check for accuracy. If the readings are off, zero the monitor again and repeat the process. If the issue continues, the sensor may need to be replaced. 

You can also use a gas monitor docking station to automate the recalibration process. 

What is the difference between calibration and bump test?

Both bump testing and calibration are done to verify your gas monitor’s functionality before use. Bump testing verifies that your gas monitor will detect the target gas in a work environment. When bump testing, you don’t have to worry about zeroing the meters or comparing the readout to the contents of the test gas. Bump tests should be done regularly, before each use, or at least every six months. If the first bump test fails, a full calibration of the device is required.

Calibration on the other hand is necessary in order to check the accuracy of your readings. A cylinder of carefully measured test gas specific to your instrument type is used to verify the accuracy of the readings displayed on the instrument. In the event that there is a difference from the expected values, an adjustment must be made. Most instruments we sell are able to do this automatically as part of the calibration routine.