| CPC G01N 1/2035 (2013.01) [G01N 1/14 (2013.01); G01N 2001/1445 (2013.01); G01N 2001/2057 (2013.01)] | 1 Claim |
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1. A gas detection system, including:
a plurality of sampling assemblies, respectively including at least one inlet channel, a first pump and a first valve, the first pump being communicated between the at least one inlet channel and the first valve, the first valve being switchable between a sampling state and a pre-sampling state;
at least one detector, selectively communicated with the first valve of one of the plurality of sampling assemblies; and
a control unit, communicative with the plurality of sampling assemblies and controlling said first valves of the plurality of sampling assemblies;
wherein when the first valve of one of the plurality of sampling assemblies is in the sampling state, the first valve of another one of the plurality of sampling assemblies is in the pre-sampling state; the first valve in the sampling state is communicated with the at least one detector, and the first valve in the pre-sampling state is non-communicated with the at least one detector and communicated with an external environment;
wherein each of the plurality of sampling assemblies further includes a manifold having a plurality of inlet ports and an outlet port disposed thereon, the plurality of inlet ports is communicated with a plurality of said inlet channels, and the outlet port is communicated with an inlet of the first pump;
wherein each of the plurality of sampling assemblies further includes a plurality of second valves communicative with the control unit, each of the plurality of second valves is arranged between one of the plurality of said inlet channels and one of the plurality of inlet ports; and in one of the plurality of sampling assemblies, when one of the plurality of second valves is opened to allow one of the plurality of said inlet channels to be communicated with one of the plurality of inlet ports, the rest of the plurality of second valves are closed;
wherein each said first pump is normally running, and one of the plurality of second valves of each of the plurality of sampling assemblies is opened
wherein the first valve of each of the plurality of sampling assemblies includes a first port, a second port and a third port communicatable with one another, the first port is communicated with an outlet of one said first pump, the second port is communicatable with the at least one detector, and the third port is communicatable with the external environment; the gas detection system further includes a third valve and a purge channel, the third valve is arranged between the plurality of sampling assemblies and the at least one detector and is switchable between a sampling state and a purge state, and the purge channel is configured for a purge gas to flow therein and is communicatable with the third valve and said first pumps; the gas detection system further includes a fourth valve disposed on the purge channel, wherein the fourth valve is arranged between an inlet of the purge channel and the said first pumps; the purge channel is communicatable with one of the plurality of inlet ports of the manifold of each of the plurality of sampling assemblies; when the third valve is in the sampling state and the fourth valve is closed, the purge channel is non-communicated with the plurality of sampling assemblies and the at least one detector; when the third valve is in the purge state and the fourth valve is opened, the purge channel is communicated with at least one said inlet ports and the at least one detector; a first regulator is arranged between the inlet of the purge channel and the third valve, and a second regulator is arranged between the inlet of the purge channel and the fourth valve; each said first valve is a 3/2-way valve; the gas detection system further includes a rack, the rack includes a receiving space and a first partition extending along a height direction of the rack, the first partition divides the receiving space into a front portion and a rear portion, the at least one detector and the said first pumps are received within the front portion, and said first valves are received within the rear portion; the rack further includes a first panel and a second panel received in the rear portion, the first panel has the said first valves, said manifolds and said second valves disposed thereon, the second panel has a plurality of connectors disposed thereon, one end of each of the plurality of connectors is configured to be connected with a sampling tube, and the other end of each of the plurality of connectors is communicated with one of the said first valves; the first partition has at least one through hole communicated the front portion with the rear portion, and the at least one through hole is configured for at least one tube connected between the said first valves and the said first pumps to penetrate therethrough; the rear portion includes a sampling area and an electronic control area, the first panel and the second panel are disposed in the sampling area, and the control unit is disposed in the electronic control area; the control unit includes a programmable logic controller; the gas detection system further includes at least one second pump communicated with the at least one detector, the at least one second pump is configured to exhaust gas from the at least one detector.
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