9
inspection. If there is a gas leak, the reading on the LCD screen will increase to
show the specific concentration of volume.
6, press “√” key to enter setup interface can change the emergency alarm
value (using
“
◄
”、“
►
”
The key changes).When the volume ratio is greater
than the alarm point, the device will emit a beeping alarm.
V. Adjustment method
1. Making up different concentration degree sulfur hexafluoride
（
1
）
Gas distribution: Needle cylinder is used;
（
2
）
Standard gas: use qualified pure sulfur hexafluoride to make up six
groups of sample gas with concentration degree of 0.01, 0.1, 1, 10, 100 and
500.
