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PTS-C701
Number of views:
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Product serial number
Category
Surface Temperature Thermocouple
Quantity
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+
Product description
Why do we need Tube skin temperature measurements ?
➣To determine accurate temperature data on the surface of the tube.
➣To withstand corrosive and harsh environment for prolonged period.
➣To secure weld attachments to the tube wall to fit any tube size.
➣Fast installation and quick replacement during maintenance period.
➣To monitor temperature in case of over heating of the tubel/pipe which leads to reduction of thelife period.
➣To obtain maximum product flow through heat exchanger.
What is the Tube skin thermocouple ?
The Tube-skin thermocouple features a powerful, reliable,and suitable design to measure the surfacetemperature of the most critical, heavy-duty furnaces, heat exchanger, and reactors. Welded directly to thetube skin (surface), the tip of the tube skin thermocouple provides precise measurement of the surfacetemperature of the process tube.Aheat shield is added to prevent the addition of externalambient gases andflame temperature on the hotjunction, thereby providing more accurate temperature results.
Tube skin Thermocouple Assembly
Expansion loops or coils are designed to avoid the effect of tube expansion which is subject to thermalgrowth.Mounting clamps are welded along the pipe to provide additional support.Mineral insulated cable(sheathed cable) is the flexible part of the sensor. It consists of a metal outer sheath of stainless steels orInconel depending on the applications,which contains the insulated conductor wires, compressed within ahigh-density magnesium oxide composition.
At one end of the sheathed cable, a non-insulated (grounded or ungrounded) junction, also known asmeasuring point(hotjunction), is formed by welding the internal conductor together at the center of the weld-pad.The measuring point is brought out closer to the tube to provide a faster and accurate measurement ofthe tube temperature.
Figure: Tube skin Thermocouple Assembly
Key Features
➣Higher precision can be obtained with the addition of an optimized shield
➣Easy to install
➣Reliability combined with fast temperature response behaviour
➣Mineral insulated with flexible sheath cable
➣Customizable according to sheath diameter and sheath materials
➣High mechanical strength and shock-resistant
➣No special machining of the contact block is required to match the tube profile.
Application Areas
➣Petrochemical and oil industries
➣High temperature industries and corrosive environments
➣Boilers, furnaces and ovens
➣Gas and chemical industries
➣Power plant technology
Technical Specification
Element | K, N,E,J |
No.of sensors | Simplex, Duplex |
Hot junction | Grounded, Ungrounded |
Sheath material | Stainless steel, Inconel |
Sheath diameter | 12.6, 10, 8, 6 etc. |
Response Time | L ess Than 10 sec. |
Temperature Range | 0-1200°C |
Accuracy | Class 1, Class 2 |
Sensor Design
Tempsens provide custom build tube skin thermocouples as per the user requirements and drawings. Thermocouple assembly consists of different types of pad as ilustrated below. Assembly also consists of an optional ceramic terminal block or head mounted transmitter.
Knife Edge Type - KE
The Knife-edge design includes a machined v-pad block which forms a grounded junction to the tube surface
Features
➣The design maximizes the accuracy of the sensor which helps to maintain optimum product flow and prevents tube from damage/rupture.
➣The v-shaped block allows a full penetration weld between the sensor and the tube surface, which eliminates the potential air gap and protect against deleterious combustion gases, thus reducing substantial measurement inaccuracies.
➣Suitable for any tube size due to v-shape, no special machining is required to match the tube profile.
➣Longer life, accurate and reliable operations.
➣Maximum thermal conductivity (between hot junction and sensing end of the assembly) and minimum the rmal conductivity (between hot junction and the gases).
Weld Pad Type - WP
Weld pad design provides a simple, reliable tube skin thermocouple for average duty furnace
Features
➣The weld-pad is marked to match the diameter of the mineral-insulated cable, which allows the hot junction of a thermocouple to be adjacent to the
measuring surface.
➣It is designed for plain and contoured surfaces.
➣Weld-pad with ungrounded junction does not create addition inaccuracies.
➣Weld pads can be mounted longitudinal or right-angled to the pipe surface and can be incorporated in any MIl-cable diameter.
➣Weld pads are less accurate than knife-edge designs while maintaining similar repeatability.
➣Heat shield can be used to improve reliability of the reading accuracy
Interchangeable Pad - IP
The interchangeable design consists of a weld pad attached to a guide channel and heat shield
Features
➣The interchangeable design allows the thermocouple to be replaced without the need to perform any re-welding on the process tube.
➣Once the guide channel has been welded on the surface of the tube,the thermocouple can be replaced without interrupting the process.
➣The design allows the welded part to be attached to the tube in absence of the sensor.
➣Grounded and ungrounded junction can be formed.
➣Heat shield can be used to improve relability of the reading accuracy
➣Customize designs are available
Strap-on Pad - SP
The strap-on pad consists of adjustable ftting for sensing the temperature of pipe
Features
➣Adjustable strap allows sensor to make good contact with the pipe surface.
➣Easy mounting and quick mounting brackets.
➣Used for measuring process temperature of hot and cold water loops in building
➣RTD's are also available for process fluid surface.
➣Extension cable is highly flexible, pemiting bending to a radius of 3cm.
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PyroTech Instrument Pty Ltd
Head Office:
Address: 7 Yamma Street Sefton NSW 2164, Sydney Australia.
Phone:
61 2 9721 8668
Fax: 61 2 9738 9343
email:
sales@pyrotech.com
Website:
www.pyro-technology.com
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Address: Room 401, Building 9, Jinbin Ruicheng, Jinbin Industrial Park, Wuqing District, Tianjin
Phone: ++86 15320153058
Fax: ++86 022-88984836
Email:
pyrotechcn@163.com
Website: www.pyro-technology.com
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