Device for measuring the temperature of a medium through a wall

Patent metadata

Field	Value
Publication number	US-2016178446-A1
Application number	US-201514977684-A
Country	US
Kind code	A1
Filing date	Dec 22, 2015
Priority date	Dec 22, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

A measuring device for determining the temperature of a medium in a container or a pipe has at least one temperature sensor, arranged on the outside of a container or pipe wall; an output for the temperature registered thereby; and an output for the measurement result obtained thereby. The device connects at least one first differentiator, capable of determining at least one first derivative of the progression over time of the temperature registered by the temperature sensor; at least one first multiplier for multiplying the derivative by a first factor which is a value for the time constant of the heat transfer through the wall; and
at least one adder,
between the output of the temperature sensor and the output of the measuring device.

First claim

1 . A measuring device configured to determine a temperature of a medium in a container or pipe, the device comprising:
a measuring device output for a measurement result (T M ); a temperature sensor, is arranged on an outside of a wall of the container or pipe; a temperature sensor output for a temperature (T F ) registered by the temperature sensor; a first differentiator, capable of determining at least one first derivative of a progression over time of the temperature (T F ), registered by the temperature sensor; a first multiplier configured to multiply the first derivative by a first factor (F 1 ), the first factor (F 1 ) being a value for a time constant of heat transfer through the wall; and an adder, wherein the first differentiator, the first multiplier, and the adder are connected between the temperature sensor output and the measuring device output, wherein a first adder input is connected to a first multiplier output, wherein a second adder input is connected to the temperature sensor output independently of the first adder input, and an adder output is connected to the measuring device output for the measurement result (T M ).

2 . The device of claim 1 , further comprising:
a series circuit, including a second differentiator and a second multiplier, including a second factor (F 2 ) which is a value for the time constant of a temperature change in the temperature sensor, connected between a first differentiator output and a third adder input.

3 . The device of claim 1 , wherein the first differentiator, the adder, and/or the first multiplier is an analog component.

4 . The device of claim 2 , wherein the first differentiator, the second differentiator, the adder, the first multiplier, and/or the second multiplier is an analog component.

5 . The device of claim 1 , further comprising:
an evaluation unit, in which the first differentiator, the adder, and/or the first multiplier is implemented as a digital processing step.

6 . The device of claim 1 , further comprising:
a correction apparatus configured to suppress an influence of ambient temperature, prevailing outside the container or pipe, connected between the temperature sensor output and an input of at least one differentiator.

7 . The device of claim 6 , wherein the correction apparatus includes an ambient-temperature sensor and a processor configured to obtain an approximate value for a wall temperature at a temperature sensor location.

8 . The device of claim 7 , further comprising:
an evaluation unit, in which the first differentiator, the adder, and/or the first multiplier is implemented as a digital processing step, wherein the correction apparatus is integrated into the evaluation unit.

Assignees

• Abb Technology Ag

Inventors

• Ude Peter

Classifications

• G01K3/04 Primary

  in respect of time · CPC title

• G01K13/02 Primary

  for measuring temperature of moving fluids or granular materials capable of flow · CPC title

• G01K1/20 Primary

  Compensating for effects of temperature changes other than those to be measured, e.g. changes in ambient temperature · CPC title

• G01K7/42

  Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature · CPC title