Set point control circuit for an infrared gas analyzer
US4918311A · kind A · utility
4Cited by
3References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Apr 15, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/126
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An arrangement for ensuring the stability of the set point for a gas analyzer is disclosed. The set point control circuit utilizes an amplifier which is alternately switched between a reference voltage and a sensor signal to provide a signal to a processor representing the reference signal and the sensor signal. The processor compares the two signals and adjusts the heater associated with the sensor to provide a stable set point for the gas analyzer. The arrangement eliminates the need for precision resistors within the set point control circuit and therefore significantly reduces the cost of the circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.