Gas detector and meter employing indicator tubes
US4254657A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1979 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | May 23, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D16/2066
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.