Designed by our customers, this robust and accurate gas detector provides unrivaled protection in confined space applications. The PS500 can be tailored to detect up to five gases with its toxic and catalytic sensors, photo ionisation detectors, and infrared capabilities. “Plug and Play” option allows the customer to “plug in” a new board with a different gas range. The PS500 is particularly useful in noisy environments, featuring a very loud (95dBA) penetrating and distinctive audible alarm together with high visibility large area visual alarm. Pump, diffusion or both together, allowing pumped sample for pre-entry checking and diffusion in confined space working, thus maximising battery life. A robust, moulded, rubberised casing guaranteeing Hi-Impact resistance, the PS500 can be used in the most demanding industrial environments.

GMI PS500 calibration guide

  1. Turn it on by holding the blue power button, release on startup
  2. Wait for second screen to come up, press left button, right, left, right
  3. Countdown at top of screen should start showing a periodic M
  4. Go to calibrate menu by pressing return once, then pressing the blue button to enter
  5. Enter code 3 3 3
  6. Press and hold power to zero all ranges
  7. Apply gas to unit, wait for sensor to stabilize (30 seconds - 1 minute)
  8. Use return button to increment up, press and hold power to accept
  9. Do this for LEL, Hydrogen Sulfide, Carbon Monoxide, and Oxygen
  10. Press and hold power button on Update to save and exit
  11. Press and hold button to confirm next calibration date
  12. Remove gas from unit and turn valve off

Standard Alarm Settings for the GMI PS500

Sensor Type Calibration Gas Value Low Alarm High Alarm TWA Alarm STEL Alarm Part Number
H2S - Hydrogen Sulfide 25ppm 10ppm 20ppm 10ppm 15ppm 65128
CO - Carbon Monoxide 100ppm 35ppm 70ppm 35ppm 200ppm 65127
LEL - Methane Curve 25% LEL 10% LEL 20% LEL N/A N/A 66825
O2 - Oxygen 18% VOL 19.5% VOL 23.5% VOL N/A N/A 66066