Envision ENV200 - Page 75

P a g e | 75
6.6.2.3.1 Gas Qualities
CH
4
- Methane
CH
4
is measured via an internal Infrared sensor. The measurement range of the sensor is 0-100% CH
4
.
CH
4
– LEL (Lower Explosive Limit)
By tapping the CH
4
box the handheld computer will display the CH
4
LEL%. The user can return to the
standard CH
4
% by tapping the CH
4
box again. Note: 100% LEL is equal to 5% CH
4
.
CO
2
– Carbon Dioxide
CO
2
is measured via an infrared sensor. The measurement range of the sensor is 0-100% CO
2
.
O
2
- Oxygen
O
2
is measured via an electrochemical sensor. The measurement range of the sensor is 0 – 25% O
2
.
Balance Gas
Balance gas is a calculated value. It is calculated as follows:
Balance gas = 100%- CH
4
- CO
2
- O
2