Teledyne 2240 – Portable Handheld Hydrogen Leak Detector, 3rd generation (updated 1/31/11) - Manual (Page 16)

Handheld Hydrogen Leak Detector Model 2240
Teledyne Analytical Instruments Page 16 of 30
The number of yellow LEDs lit in the Probe LED bar graph array
indicates detected hydrogen concentrations in four ranges as
noted below:
1 Yellow LED:
> 0.01% hydrogen
> 100 ppm
2 Yellow LEDs:
> 0.1% hydrogen
> 1,000 ppm
3 Yellow LEDs:
> 1% hydrogen
> 10,000 ppm
4 Yellow LEDs:
> 10% hydrogen
> 100,000 ppm
LED Bar Graph Array