Claims
- 1. A system for providing an output signal which is substantially linear with fluid temperature comprising:
- operational amplifier circuit means having an output terminal;
- a thermistor probe having a resistance which is an exponential function of fluid temperature;
- said thermistor resistance connected in feedback path with said operational amplifier circuit means;
- log converter circuit means coupled to said output terminal of said operational amplifier circuit means for providing said output signal which is substantially linear with fluid temperature;
- a hot probe temperature setting potentiometer having a volts-per-degree temperature sensitivity equal to the volts-per-degree temperature sensitivity of said output signal; and,
- summing amplifier circuit means responsive to said output signal and connected to said probe temperature setting potentiometer for providing a signal voltage representative of the difference between hot probe operating temperature and the fluid temperature.
Parent Case Info
This is a division of application Ser. No. 727,508, filed Sept. 28, 1976, now U.S. Pat. No. 4,070,908.
US Referenced Citations (8)
Divisions (1)
|
Number |
Date |
Country |
Parent |
727508 |
Sep 1976 |
|