【Function
and Purpose】
Function:
The
leakage detector for buried pipelines can work not only on the ground above the
pipeline but also for the detection of pit and wells nearby the pipeline. It
can detect leakage of such combustible gases as petroleum liquefied gas,
artificial town gas and natural gas, which is the indispensable leakage
detection equipment in the gas industry in China.
Purpose:
1.
Detection of leakage points on underground gas transportation pipelines of
urban gas companies;
2.
Accurate location of leakage points on long transportation pipelines of gas
production plants and gas transportation companies;
3.
Search for underground pipelines of natural gas purification plants, chemical
plants, gas stations, etc., and detection of underground pipeline joints and
valve points.
【Characteristics】
1.
A handheld probe is used to detect leakage of ground and underground combustible
gases;
2.
Alarm sounds when the leakage gas of underground pipeline reaches the
concentration for alarming;
3.
The built-in rechargeable lithium battery pack;
4.
The most advanced sensor and getter pump are used to avoid interference by the
volatilization gas of bituminous pavement and by the vehicle exhaust, featuring
low temperature resistance, high sensitivity and reliability;
5.
Suction-type leakage detection, high sensitivity, and quick response;
6.
It can detect the leakage condition on the ground just after power-on and
calibration, easy to operate;
7.
The alarm tone varies with the concentration, no need for the operator to pay
attention to the displayed value;
8.
Zero adjustment function;
9.
LCD display.
【Primary
Technical Parameters】
●Power supply: 7.4V
lithium battery pack
●Detection range: 0-100PPM,
and 0-10000PPM;
●Set point of
alarming: 100PPM（start continuous tone alarming）;
●Response speed:
Approximately 7 seconds（90% answer）；
●Alarm indication:
(gas detection) displayed in the value of gas concentration. In case the set
point is exceeded, the buzzer sounds to alarm (from intermittent to continuous
tones);
●Working time:
Approximately 16 hours
●Operating temperature
range:-10～40°C；
●Minimum resolution: 5PPM；
●SL-808A applicable to
urban gas (the main component of methane);
●Storage temperature: -10°C～+50°。
【Detection
Principles and Methodology 】
In
case of the combustible gas leakage due to the corrosion or rupture of
underground pipelines, the gas suffuses and spreads to the ground, and has the
largest concentration right over the leakage point. Based on that, the leakage
detector has the gas-sensitive probe move above the pipeline, and when the
probe gets in contact with the combustible gas, the reading on the meter
increases quickly to generate an alarming signal. Adjust the sensitivity to
determine the area with the maximum concentration, in order to locate the
leakage accurately.
