Precautions during the installation of temperature instruments
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1. The installation location of the temperature primary sensor should be chosen in a place where the medium temperature changes significantly and in a representative manner; it should not be placed near components that create resistance such as valves or welds, nor in areas where the flow of the medium is restricted. 2. The temperature secondary meter must be used in conjunction with it. Thermal resistors and thermocouples require corresponding secondary meters or transmitters. Special attention should be paid to the scale number; tables with different scale numbers must not be used incorrectly. 3. Thermocouples must be used with compensation wires of the corresponding calibration type. Thermal resistors should be connected in a three-wire configuration to counteract the effects of ambient temperature. Every type of secondary meter has specific requirements regarding the resistance of its external wiring. In addition to the resistance of the compensation wires or cables, manganin wires with appropriate resistances must also be used to meet the requirements of the secondary meter. 4. Resistor elements typically use three-core cables, or three of the four cores in a cable; the resistance value of each core can be measured using the following method. 5. Compensation wires or cables are connected to thermocouples or thermal resistors through metal flexible tubes. 6. If there are both pressure primary points and temperature primary points on the same pipeline, the pressure primary point should be located on the upstream side of the temperature primary point. 7. The installation of temperature secondary instruments is relatively simple. The secondary meters, whose monomers have been properly calibrated, can be installed on the dashboard or frame according to the installation instructions.
The precautions for installing temperature instruments are as follows: 1. Selection of installation location: The installation location for the primary temperature sensor should be chosen in a place where the temperature of the medium changes significantly and in a representative manner; it is advisable to avoid locations near components that create resistance such as valves or welds, as well as areas where the flow of the medium is restricted. 2. Matching use: Temperature secondary meters need to be used in conjunction with corresponding thermal resistors or thermocouples, and care must be taken to ensure that the calibration grades match; meters with different calibration grades should not be used interchangeably. 3. Wire selection: Thermocouples must use compensation wires corresponding to their specific calibration class, while thermal resistors should be connected in a three-wire configuration to counteract the effects of ambient temperature. Each type of secondary meter has specific requirements regarding the resistance of its external wiring. In addition to the resistance of the compensation wires or cables, manganin wires with appropriate resistances must also be used to meet the requirements of the secondary meter. 4. Resistance measurement: Resistor elements usually employ three-core cables, or three of the four cores in a cable, and the resistance value of each core can be measured using appropriate methods. 5. Connection method: The compensation wire or cable is connected to the thermocouple or thermal resistor through a metal flexible tube. 6. If there are both pressure primary points and temperature primary points on the same pipeline, the pressure primary point should be located on the upstream side of the temperature primary point. 7. Installation of secondary instruments: The installation of temperature secondary instruments is relatively simple; it only requires installing the individually calibrated secondary instruments on the dashboard or frame in accordance with the installation instructions. .