Calorimetric flow monitor
US4028689A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1975 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Sep 18, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R17/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A calorimetric flow monitor comprising a measuring head adapted to be connectable to a pipe carrying a flow medium. The measuring head includes two thermistors, one of which is surrounded by a heating coil to be heated thereby. The unheated thermistor and the heatable thermistor together with its heating coil are mounted in a pair of pins protruding from the measuring head. The thermistors are connected in an electrical bridge circuit. A first differential amplifier for determining increases and decreases in the flow of the medium relative to a preset flow is connected to the bridge circuit. Visual indicating devices are optionally provided to indicate when the flow is above and below the preset flow. A second differential amplifier for monitoring the occurrence of breakages in conductors connected to the thermistors and the heating coil, is also connected to the bridge circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.