Measurement apparatus for measuring air flowing inside pipeline
Various embodiments include a testing apparatus capable of testing gas flowing in a duct. The apparatus may include: a housing; a sampling tube extending from the housing to be inserted into the duct, the sampling tube including a gas entry channel and a gas exit channel isolated from each other, with a gas inlet of the gas entry channel and a gas outlet of the gas exit channel disposed in a part of the sampling tube leading into the duct and disposed at the same side of the sampling tube, wherein the gas inlet and the gas outlet have matching gas through-flow areas; and a sensor module disposed in the housing and in gas communication with the gas entry channel to test gas sampled from the gas entry channel.
1 . A testing apparatus capable of testing gas flowing in a duct with a primary flow direction, the apparatus comprising:
a housing;
a sampling tube extending from the housing to be inserted into the duct, the sampling tube including a gas entry channel and a gas exit channel isolated from each other, with a gas inlet of the gas entry channel and a gas outlet of the gas exit channel both disposed in a sidewall of the sampling tube facing into the primary flow of the gas, wherein the gas inlet and the gas outlet have matching gas through-flow areas; and
a sensor module disposed in the housing and in gas communication with the gas entry channel to test gas sampled from the gas entry channel.
2 . The testing apparatus as claimed in claim 1 , wherein a gas pressure due to gas flow in the duct at the gas inlet is substantially equal to a gas pressure due to gas flow in the duct at the gas outlet.
3 . The testing apparatus as claimed in claim 1 , wherein the gas inlet and the gas outlet are adjacent to each other.
4 . The testing apparatus as claimed in claim 1 , wherein the sensor module includes:
an inlet and an outlet; and
a fan leading a gas flow in through the inlet and out through the outlet.
5 . The testing apparatus as claimed in claim 1 , wherein the gas inlet and the gas outlet are both at a windward side of the sampling tube with respect to a gas flow direction in the duct.
6 . The testing apparatus as claimed in claim 1 , wherein the gas inlet and the gas outlet are both at a leeward side of the sampling tube with respect to a gas flow direction in the duct.
7 . The testing apparatus as claimed in claim 1 , wherein the gas inlet and the gas outlet are both on an end face of an end of the sampling tube that extends into the duct.
8 . The testing apparatus as claimed in claim 1 , wherein the sampling tube is integrally formed and has a dividing part dividing the sampling tube into the gas entry channel and the gas exit channel.
9 . The testing apparatus as claimed in claim 8 , wherein the gas inlet and the gas outlet are aligned in the longitudinal direction of the sampling tube.
10 . The testing apparatus as claimed in claim 1 , wherein at least one of the gas inlet and the gas outlet has multiple gas holes.
11 . The testing apparatus as claimed in claim 1 , wherein:
the sensor module has an inlet and an outlet;
the gas entry channel is connected in a sealed manner to the inlet of the sensor module;
the outlet of the sensor is in gas communication with an interior space of the housing; and
the gas exit channel is connected into the housing in a sealed manner.
12 . The testing apparatus as claimed in claim 1 , wherein the sensor module comprises a PM2.5 sensor.