# US 4,391,913 A · Temperature regulating system for the control of temperature in a room

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- Number: US 4,391,913 A
- Document ID: US4391913A
- Status: Granted
- Kind: A
- Application number: 06/388,214
- Filed: 1982-06-14
- Granted: 1983-07-05
- Earliest claimed: 1979-05-21
- Assignees: Elpan ApS
- Inventors: Erik C. V. Keldmann
- Web page: https://patentgrep.com/patent/US4391913A

## CPC

- G05D 23/1905: {associated with tele control}
- G05D 23/27: with sensing element responsive to radiation
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

## Abstract

A temperature regulating system for a room comprising a feeler gauge (A) suspended from the ceiling and being capable of sensing the air and the radiation temperatures, the instantaneous values of which control a wireless transmitter built into the feeler gauge to trasmit signals to a regulator (B or C) for the radiators heating the room. The feeler gauge may be easily suspended in a position most advantageous for detecting the temperatures, and causing the least inconvenience to the furnishings in the room.

## Claims

### Claim 1

A temperature regulating system for controlling the temperature in a room comprising a feeler gauge adapted to control the supply of energy to a radiator system in the room, said gauge being adapted to be suspended in a room and comprising a radiation sensor and a convection sensor for sensing the radiation and air temperature respectively, and a wireless transmitter means, said convection sensor being operatively connected to said transmitter means to control the transmitter means to emit signals depending on the radiation and air temperature sensed at regular intervals, and a receiver controlling means for receiving said signals and regulating the supply of energy to the radiator system, said convection sensor comprising a thermal sensitive member for sensing air temperature and having properties which change in response to temperature changes, said radiation sensor comprising a thin-walled hemisphere of good heat-conducting material having a black mat radiation absorbing surface connected in heat-conducting relationship with said convection sensor, said transmitter means comprising a printed circuit including said convection sensor therein so that signals representing said changed properties are transmitted by said transmitter means to said receiver, programming means in said receiver whereby the desired temperature can be programmed in the receiver, and means to compare said signals with said desired temperature.

### Claim 2 (depends on 1)

A temperature regulating system as claimed in claim 1 wherein said convection sensor comprises a temperature dependent electronic component as the variable element in a bridge circuit, said transmitter means is connected in said bridge circuit to be excited by the variations thereof produced by said temperature dependent electronic component.

### Claim 3 (depends on 2)

A temperature regulating system as claimed in claim 2 wherein said temperature dependent electronic component is an NTC resistor, the bridge circuit includes other components comprising resistors of constant value, said transmitter means comprises an ultrasonic transmitter, and said receiver comprises an ultrasonic receiver.

### Claim 4 (depends on 3)

A temperature regulating system as claimed in claim 3 wherein said feeler gauge is in the form of a hollow globular member with said thin-walled hemisphere forming the lower part thereof, and said convection sensor is located at the lower central position on the outer surface of said hemisphere.