On-site installation method of thermometers
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On-site installation method of thermometers
1. To ensure adequate heat exchange between the measuring end of the thermoresistor and the medium being measured, the location of the measurement point should be chosen carefully. It is advisable to avoid installing thermoresters near valves, elbows, as well as in dead corners of pipes and equipment.
2. Thermoresters with protective sleeves suffer from heat transfer and dissipation losses. To reduce measurement errors, thermocouples and thermoresters should have an adequate insertion depth:
(1) For thermoresters used to measure the temperature of the fluid at the center of a pipe, their measuring ends should generally be inserted into the center of the pipe, whether it is installed vertically or at an angle. If the diameter of the pipe containing the fluid is 200 millimeters, the insertion depth of the thermorester should be around 100 millimeters.
(2) For measuring the temperature of high-temperature, high-pressure, or fast-flowing fluids (such as main steam temperature), in order to minimize the resistance exerted by the protective sleeve on the fluid and prevent it from breaking under the influence of the fluid, it is possible to use a thermorester with a shallowly inserted protective sleeve, or a thermorester of the heat-shield type. For thermoresters with a shallowly inserted protective sleeve, the depth of insertion into the main steam pipe should be no less than 75 mm; the standard insertion depth for thermoresters of the heat-shield type is 100 mm.
(3) If it is necessary to measure the temperature of smoke in a flue, even if the diameter of the flue is 4 meters, an insertion depth of 1 meter for the thermorester is sufficient.
(4) When the insertion depth of the measuring element exceeds 1 meter, it is advisable to install it vertically as much as possible, or to use support frames and protective sleeves.
2. Thermoresters with protective sleeves suffer from heat transfer and dissipation losses. To reduce measurement errors, thermocouples and thermoresters should have an adequate insertion depth:
(1) For thermoresters used to measure the temperature of the fluid at the center of a pipe, their measuring ends should generally be inserted into the center of the pipe, whether it is installed vertically or at an angle. If the diameter of the pipe containing the fluid is 200 millimeters, the insertion depth of the thermorester should be around 100 millimeters.
(2) For measuring the temperature of high-temperature, high-pressure, or fast-flowing fluids (such as main steam temperature), in order to minimize the resistance exerted by the protective sleeve on the fluid and prevent it from breaking under the influence of the fluid, it is possible to use a thermorester with a shallowly inserted protective sleeve, or a thermorester of the heat-shield type. For thermoresters with a shallowly inserted protective sleeve, the depth of insertion into the main steam pipe should be no less than 75 mm; the standard insertion depth for thermoresters of the heat-shield type is 100 mm.
(3) If it is necessary to measure the temperature of smoke in a flue, even if the diameter of the flue is 4 meters, an insertion depth of 1 meter for the thermorester is sufficient.
(4) When the insertion depth of the measuring element exceeds 1 meter, it is advisable to install it vertically as much as possible, or to use support frames and protective sleeves.
Today’s thermometers are all installed using a sleeve design. The advantage of this is that the temperature sensing element does not come into contact with the medium, which prevents phenomena such as coking from occurring on the sensing element and leading to inaccurate temperature readings and distorted data. Additionally, with a sleeve type, it is also easy to replace the thermometer – just replace it directly. If a direct insertion medium is used, replacing the thermometer requires cutting the pipeline, which is rather troublesome.
Agree with the view from the 2nd floor. Also, the insertion depth on subsequent occasions should not be too deep; it is related to the flow rate.
Welded, flanged, threaded, and direct-insert type. . .
Casing type is now very commonly used. Correct answer
The sleeve type is more flexible, easy to assemble and disassemble, and has low error
Reply 1# 2003021220: The thermometer should be installed in a location where temperature changes are significant; the insertion direction of the thermometer should be perpendicular to the flow direction of the fluid, at an angle of 45 degrees. However, the properties of the medium should also be taken into account; if it has high viscosity and tends to stick, it should be installed at a 45-degree angle flowing with the current.