Today we're looking at the GMI PS500 4-gas detector. It's a pumped and diffusion model, you hold the power button to switch between modes. Hold both buttons to turn it off.

To calibrate this unit:
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

Calibration Gas:
25ppm Hydrogen Sulfide
100ppm Carbon Monoxide
50% LEL Methane
18.0% VOL Oxygen
Nitrogen balance

Buy the calibration gas here:
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Buy a replacement Oxygen Sensor here:
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If you have any gas monitor or calibration gas questions, please feel free to call us at 1-734-956-0539 or to email me support@idealcalibrations.com. We'd be happy to answer any questions you have.

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