GB2132766A - Thermocouples and resistance thermometers - Google Patents

Thermocouples and resistance thermometers Download PDF

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Publication number
GB2132766A
GB2132766A GB08236202A GB8236202A GB2132766A GB 2132766 A GB2132766 A GB 2132766A GB 08236202 A GB08236202 A GB 08236202A GB 8236202 A GB8236202 A GB 8236202A GB 2132766 A GB2132766 A GB 2132766A
Authority
GB
United Kingdom
Prior art keywords
transmitter
sensing means
temperature sensing
head
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08236202A
Other versions
GB2132766B (en
Inventor
Dr Eiermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BUSH BEACH ENGINEERING Ltd
Original Assignee
BUSH BEACH ENGINEERING Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BUSH BEACH ENGINEERING Ltd filed Critical BUSH BEACH ENGINEERING Ltd
Priority to GB08236202A priority Critical patent/GB2132766B/en
Publication of GB2132766A publication Critical patent/GB2132766A/en
Application granted granted Critical
Publication of GB2132766B publication Critical patent/GB2132766B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/08—Protective devices, e.g. casings

Abstract

In a thermocouple or resistance thermometer including temperature sensing means 3, a head which houses the end of the temperature sensing means remote from the temperature to be measured and a temperature transmitter 7 to convert the output from the temperature sensing means to a desired range, the transmitter is located within the head but separate from the temperature sensing means so that the latter only need be changed if it fails. The transmitter 7 may be located in a hinged lid 5 and connected to the temperature sensing means 3 by flexible connections 8. <IMAGE>

Description

SPECIFICATION Thermocouples and resistance thermometers This invention relates to thermocouples and resistance thermometers. More particularly, it relates to connection heads for such devices including a temperature transmitter.
Conventionally thermocouples and resistance thermometers are provided with a connection head which includes a terminal block directly connected to the temperature sensing means of the thermocouple or resistance thermometer. This terminal block is housed in the head and is used to connect the thermocouple or resistance thermometer to instruments which record or display the.temperature being measured. It has recently become necessary to convert the output of thermocouples and resistance thermometers to a range which is suitable as the input for microprocessors, for example the range of about 4 to 20 milliamps. This conversion is effected by means of a so called temperature transmitter which incorporates suitable electronic circuitry for the conversion and may also include other circuitry if desired.
It has previously been proposed that the transmitter should replace the terminal block, i.e. the transmitter is directly connected to the temperature sensing means of the thermocouple or resistance thermometer. It has also been proposed that the transmitter should be positioned in a panel adjacent to the microprocessor.
The present invention provides a thermocouple or resistance thermometer including temperature sensing means, a head which houses the end of the temperature sensing means remote from the temperature to be measured and a temperature transmitter to convert the output from the temperature sensing means to a desired range, characterised in that the transmitter is located within the head but separate from the temperature sensing means.
The transmitter can be located in the head in any desired manner, provided that it is separate from the temperature sensing means.
According to one particularly convenient embodiment of the invention, the head is provided with a hinged lid and the transmitter is located in the lid. The temperature sensing means is then provided with a terminal block in the conventional manner and the terminal block is connected to the transmitter by flexible connections, e.g. wires.
Locating the transmitter within the head but separate from the temperature sensing means has the advantage that the transmitter can easily be disconnected from the temperature sensing means for on-site checks. If the temperature sensing means fails then only this part of the thermocouple or resistance thermometer need be replaced, whereas if the transmitter is integral with the temperature sensing means it is necessary to replace the whole combination including the transmitter.
The invention will now be described in more detail with reference to the accompanying drawing which is a side view, partly in section, of the head of a resistance thermometer according to the invention.
The head comprises a body 1, integral with a pocket 2 which receives the sensor inset 3 of a platinum resistance thermometer. The sensor inset is connected to a terminal block 4 and the combination of sensor inset and terminal block is fixed to the body in a manner such that it can be removed and replaced if necessary. The head also includes a lid 5 hinged to the body and the body is provided with a quick release clip 6 to secure the lid to the body. The lid is sufficiently deep to accomodate a transmitter 7. The transmitter is connected to the terminals on the terminal block by means of wires 8.
The transmitter converts the output of the resistance thermometer to a range suitable for feeding to a microprocessor, e.g. 4 to 20 mA, and comprises appropriate electronic circuitry for this purpose potted in epoxy resin. The transmitter may also include a linearizing circuit to compensate the non-linear thermometer input to provide an output signal directly proportional to temperature.
1. A thermocouple or resistance thermometer including temperature sensing means, a head which houses the end of the temperature sensing means remote from the temperature to be measured and a temperature transmitter to convert the output from the temperature sensing means to a desired range, characterised in that the transmitter is located within the head but separate from the temperature sensing means.
2. A thermocouple or resistance thermometer as claimed in claim 1, wherein the head is provided with a hinged lid and the transmitter is located in the lid.
3. A thermocouple or resistance thermometer as claimed in claim 2, wherein.the temperature sensing means is provided with a terminal block and the terminal block is connected to the transmitter by flexible connections.
4. A thermocouple or resistance thermometer substantially as described with particular reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Thermocouples and resistance thermometers This invention relates to thermocouples and resistance thermometers. More particularly, it relates to connection heads for such devices including a temperature transmitter. Conventionally thermocouples and resistance thermometers are provided with a connection head which includes a terminal block directly connected to the temperature sensing means of the thermocouple or resistance thermometer. This terminal block is housed in the head and is used to connect the thermocouple or resistance thermometer to instruments which record or display the.temperature being measured. It has recently become necessary to convert the output of thermocouples and resistance thermometers to a range which is suitable as the input for microprocessors, for example the range of about 4 to 20 milliamps. This conversion is effected by means of a so called temperature transmitter which incorporates suitable electronic circuitry for the conversion and may also include other circuitry if desired. It has previously been proposed that the transmitter should replace the terminal block, i.e. the transmitter is directly connected to the temperature sensing means of the thermocouple or resistance thermometer. It has also been proposed that the transmitter should be positioned in a panel adjacent to the microprocessor. The present invention provides a thermocouple or resistance thermometer including temperature sensing means, a head which houses the end of the temperature sensing means remote from the temperature to be measured and a temperature transmitter to convert the output from the temperature sensing means to a desired range, characterised in that the transmitter is located within the head but separate from the temperature sensing means. The transmitter can be located in the head in any desired manner, provided that it is separate from the temperature sensing means. According to one particularly convenient embodiment of the invention, the head is provided with a hinged lid and the transmitter is located in the lid. The temperature sensing means is then provided with a terminal block in the conventional manner and the terminal block is connected to the transmitter by flexible connections, e.g. wires. Locating the transmitter within the head but separate from the temperature sensing means has the advantage that the transmitter can easily be disconnected from the temperature sensing means for on-site checks. If the temperature sensing means fails then only this part of the thermocouple or resistance thermometer need be replaced, whereas if the transmitter is integral with the temperature sensing means it is necessary to replace the whole combination including the transmitter. The invention will now be described in more detail with reference to the accompanying drawing which is a side view, partly in section, of the head of a resistance thermometer according to the invention. The head comprises a body 1, integral with a pocket 2 which receives the sensor inset 3 of a platinum resistance thermometer. The sensor inset is connected to a terminal block 4 and the combination of sensor inset and terminal block is fixed to the body in a manner such that it can be removed and replaced if necessary. The head also includes a lid 5 hinged to the body and the body is provided with a quick release clip 6 to secure the lid to the body. The lid is sufficiently deep to accomodate a transmitter 7. The transmitter is connected to the terminals on the terminal block by means of wires 8. The transmitter converts the output of the resistance thermometer to a range suitable for feeding to a microprocessor, e.g. 4 to 20 mA, and comprises appropriate electronic circuitry for this purpose potted in epoxy resin. The transmitter may also include a linearizing circuit to compensate the non-linear thermometer input to provide an output signal directly proportional to temperature. CLAIMS
1. A thermocouple or resistance thermometer including temperature sensing means, a head which houses the end of the temperature sensing means remote from the temperature to be measured and a temperature transmitter to convert the output from the temperature sensing means to a desired range, characterised in that the transmitter is located within the head but separate from the temperature sensing means.
2. A thermocouple or resistance thermometer as claimed in claim 1, wherein the head is provided with a hinged lid and the transmitter is located in the lid.
3. A thermocouple or resistance thermometer as claimed in claim 2, wherein.the temperature sensing means is provided with a terminal block and the terminal block is connected to the transmitter by flexible connections.
4. A thermocouple or resistance thermometer substantially as described with particular reference to the accompanying drawing.
GB08236202A 1982-12-20 1982-12-20 Thermocouples and resistance thermometers Expired GB2132766B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08236202A GB2132766B (en) 1982-12-20 1982-12-20 Thermocouples and resistance thermometers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08236202A GB2132766B (en) 1982-12-20 1982-12-20 Thermocouples and resistance thermometers

Publications (2)

Publication Number Publication Date
GB2132766A true GB2132766A (en) 1984-07-11
GB2132766B GB2132766B (en) 1986-10-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08236202A Expired GB2132766B (en) 1982-12-20 1982-12-20 Thermocouples and resistance thermometers

Country Status (1)

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GB (1) GB2132766B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4958938A (en) * 1989-06-05 1990-09-25 Rosemount Inc. Temperature transmitter with integral secondary seal
US7223014B2 (en) * 2003-03-28 2007-05-29 Intempco Controls Ltd. Remotely programmable integrated sensor transmitter
US8303179B2 (en) * 2006-06-03 2012-11-06 Precision Linear Systems, Inc. Temperature-sensing and transmitting assemblies, programmable temperature sensor units, and methods of making and using them

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1195617A (en) * 1967-09-08 1970-06-17 Honeywell Inc Improvements in or relating to Apparatus for Transmitting a Current Signal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1195617A (en) * 1967-09-08 1970-06-17 Honeywell Inc Improvements in or relating to Apparatus for Transmitting a Current Signal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4958938A (en) * 1989-06-05 1990-09-25 Rosemount Inc. Temperature transmitter with integral secondary seal
WO1990015312A1 (en) * 1989-06-05 1990-12-13 Rosemount Inc. Temperature transmitter with integral secondary seal
US7223014B2 (en) * 2003-03-28 2007-05-29 Intempco Controls Ltd. Remotely programmable integrated sensor transmitter
US8303179B2 (en) * 2006-06-03 2012-11-06 Precision Linear Systems, Inc. Temperature-sensing and transmitting assemblies, programmable temperature sensor units, and methods of making and using them

Also Published As

Publication number Publication date
GB2132766B (en) 1986-10-01

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