Device for measuring the temperature of the material contained in a closed apparatus
AssigneePomini Farrel S.p.A.
InventorBruno Piai
Life of this patent
Estimating the term…
Abstract
Device for measuring the temperature of the material contained in a closed apparatus. Including a probe equipped with a sensitive thermocouple element mounted in a protective housing made of an electrically and thermally insulating material in contact with the material to be measured, the element is connected with a preamplification electronic circuit adjacent to it, and having an operational preamplifier connected with a couple of semiconductor switches and an integration circuit which probe is connected to means located at a distance from the apparatus for amplifying and processing the signal and associated with visualization, recording and control members.
Claims12
An apparatus for measuring the temperature of materials in a closed environment, comprising:
- a probe including
- an elongated housing having a first end adapted to contact said material and a second end remote from said first end,
- a thermocouple constituted of two wires of metals having different thermoelectric characteristics and connected together at one end to form a weld located at said first end, and
- an electrically and thermally insulating ceramic envelope receiving said wires and in which said weld is received at a short distance from a surface of said envelope at said first end in contact with said material, said envelope being constituted of a composition containing 60 to 70% zirconium oxide and 20 to 30% alumina and having a coefficient of thermal expansion close to that of said wires;
- an electronic preamplification circuit in a housing mounted on said second end of said probe, connected to said wires;
- and
- signal processing means remote from said probe and electrically connected to said preamplification circuit, said signal processing means including a remotely located amplifier and means for displaying an output from said probe.
The apparatus for measuring the temperature of materials in a closed environment, comprising:
- a probe including an elongated housing having a first end adapted to contact said material and a second end remote from said first end, and a thermocouple in said probe constituted of two wires of metals having different thermoelectric characteristics and connected together at one end to form a weld located at said first end of said housing and constituting a hot junction of said thermocouple, said wires forming a cool junction of said thermocouple at said second end;
- an electronic preamplification circuit in a housing mounted on said second end of said probe connected to said cold junction and including:
- an operational amplifier having inputs connected to said wires,
- a first controlled switch bridged across said preamplification circuit ahead of said operational amplifier and across the inputs thereof,
- a second controlled switch bridged between an output of said operational amplifier and a ground conductor, and
- an integration circuit connected to said output of said operational amplifier;
- and
- signal processing means remote from said probe and electrically connected to said integrator, and said ground conductor, signal processing means including the amplifier remotely located and means for displaying an output from said probe.
Dependencies are inferred from the claim text.