Gas detector and meter employing indicator tubes

Details Gas detector and meter employing indicator tubes Gas detector and meter employing indicator tubes

1979-05-23

1981-03-10

Kreitman, Stephen A.

Measuring and testing

Measuring vessel

G01N 124

Patent

active

042546575

ABSTRACT:
A gas detecting and measuring device with which the gas or air to be examined is taken into a testing or measuring vessel such as an indicator tube by means of a feed system comprises an electrical motor driven suction pump and a pressure gauge connected thereto for pumping the gas to be tested through a connecting line. The connecting line includes the suction pump and a volume sensor provided in addition to a pressure sensor. The differential signal formed of the volume signal is converted in a characteristic generator to a desired pressure signal and the actual pressure signal from the pressure sensor is applied to a speed governor for the suction pump motor so that the suction pump is controlled to effect equalizing the actual pressure signal with a desired pressure signal.

REFERENCES:
patent: 3782198 (1974-01-01), Wachter et al.
patent: 3953152 (1976-04-01), Sipin
patent: 3956940 (1976-05-01), Guild
patent: 4021201 (1977-05-01), Vautrain et al.

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