Temperature instrument installation and applicable environment1

Temperature meter, sort is more, such as thermocouple heat resistance bimetallic thermometer temperature transmitter non-contact temperature instrument in situ thermometer, temperature switches, etc. , has wide application in many fields and industries. And according to the different forms, with different ways of installation. The next project to us the fixed form.

temperature instrument installation can be divided into the following four types: fixed installation fixed installation, threaded flange, flange threaded joint fixed installation, insert installation simple cases.

1, flange installation: suitable for on the device as well as high temperature, corrosive medium in the low pressure piping installation temperature meter, has wide adaptability, good corrosion resistance, easy maintenance, etc.

flange fixed loading ways of the flange there are five commonly:

( 1) Flat welding steel flange HG - 5010 58 ( Carbon steel) HG 5019 - 58 ( Stainless steel)

( 2) Butt welding steel flange HG - 5014 58 ( Flat butt welding flanges) HG 5016 - 58 ( Concave and convex face welding flanges)

( 3) Flat welding loose tube steel flange HG - 5022 58

( 4) Crimping loose tube steel flange HG - 5025 58 ( Copper) HG 5026 - 58 ( Aluminum)

( 5) Flange cover HG - 5028 58

2, threaded connection is fixed: generally applicable to pipe installed on the thermometer without corrosive medium, the refining sector also use this type of installation on the device by habit, the advantages of small size, installation of the advantages of more compact.

high pressure ( PN22MPa，PN32MPa) Pipe installed on the thermometer thermometer welding casing, belong to the threaded connection installation form, there are fixed and removable casing pipe in two forms. The former used for general medium, the latter for easy to corrosion, easy to wear and need replacement.

thread connection of fixed, there are five English 1 ', 34 'and 12', of the metric system with M33 * 2 and M27 * 2.

thermocouple use 1 or more M33 x 2 screw fixation, also has adopted 34 'thread, individual situation also with 12' thread;

multi-purpose inch pipe thread fixed thermal resistor, which is the most commonly used with 34 ', 12 'some also use;

bimetallic thermometer fixed screw thread are M27 x 2;

pressure type thermometer fixed thread is 34 'and M27 x 2 two kinds.

G34 'and M27 x 2 outer diameter is very close, and can turn into 1 '2 clasp, be careful when installing recognize, or wrong welding joint (thermometer Convex sets) The thermometer can not install.

3, flange fixed together with the threaded connection: when installed with additional cases, is suitable for the corrosive medium in the pipe and equipment installation.

4, simple case insert installation: there are fixed and can change of cutting sleeve type has the casing pipe ( Insert depth adjustable) Two forms, suitable for bar type thermometer on the low pressure pipeline installation as a temporary test.

temperature measuring element most installations in carbon steel, stainless steel, non-ferrous metals, lining or coating of pipe and equipment, sometimes also installed in the brick masonry, PVC, glass, pottery and porcelain, porcelain pipe and equipment such as sugar. Installation and installation of the latter on the carbon steel or stainless steel pipe and equipment are quite different, but with the lining or coating equipment and pipeline basic same, source components are also similar, you can refer to.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor