An armored thermal resistor is a type of temperature sensor. When a substance changes its temperature, its resistance will also measure the temperature as it changes. When the resistance value changes, the working instrument will show the temperature value corresponding to the resistance value. It is smaller than the diameter of the assembled platinum resistance, and it is easy to bend. It is suitable for installation in narrow channels, fast response, and miniaturization. It can automatically detect gases, liquid media and solid surfaces within the temperature range of -200~600°C, and can also be directly connected with copper wires and secondary instruments. Because it has very good electrical output characteristics, it can Accurate input values ​​for displays, recorders, regulators, scanners, data loggers, and computers. Below, Tiankang will give you a brief introduction on the purchase of attention.
Armored thermal resistors are made of a combination of metal maintenance tubes, insulation materials and resistors. The resistor in the armored RTD is made of fine platinum wire on a platinum-rhodium thermocouple ceramic or glass crucible. The lead is usually steel wire or silver wire.
Precautions:
1. The connecting wire of the thermal resistance and appearance meter should be insulated copper wire, and the compensation wire of thermocouple cannot be used. The resistance value of the copper wire should be matched according to the data showing the technical conditions of the instrument. It is usually 2 to 50. The resistance value of the wire can be adjusted with a DC equalization bridge.
2. It is not possible to use a thermistor in parallel with the two display meters, as long as the dual-branch thermal resistor can be used together with the two display meters.
3, thermal resistance and accessories when not in use, must be kept in the vibration and collision center. The most suitable storage site conditions are: ambient temperature 10-35 °C; relative humidity not greater than 80%; surrounding air should not contain substances that may form corrosion of thermal resistance parts.
4. When wiring the thermal resistance, open the junction box first and then connect it. The wiring method is usually two-wire and three-wire. The advantage of the three-wire connection is that it can prevent the bimetal thermometer from appearing due to the resistance value of the connected wire.
5, most of the thermal resistance of the sensor's length is about 120mm, which choose the insertion depth of the thermal resistance, it should be taken into account that the thermal resistance can only be measured within the near-side sensor within the near-field uniformity of the measured medium.
6, the maximum operating temperature of the thermal resistance and working pressure can not exceed the rated value of the thermal resistance, if the thermal resistance needs to be used in the corrosive medium, the maintenance tube made of stainless steel should be used.
7, with a flexible performance, armored thermal resistance in addition to the head, but also for any direction of the bend, so it is suitable for the construction of more complex, but also has a good resistance to vibration, impact resistance.
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Polyacrylamide
Polyacrylamide (PAM) is a water-soluble polymer, which is insoluble in most organic solvents, has good flocculating properties, can reduce frictional resistance between liquids, Can be divided into non-ionic, anionic, cationic and amphoteric four types.
When PAM is used for flocculation, it is related to the surface properties of the species being flocculated, especially the potential, viscosity, turbidity, and pH of the suspension. The kinetic potential of the particle surface is the reason for particle inhibition. Can reduce the potential and condense.
Granular polyacrylamide flocculant cannot be directly added to sewage. It must be dissolved in water before use, and its aqueous solution are used to treat sewage.The water in which the particulate polymer is dissolved should be clean. Generally tap water is suitable for formulating polymer solutions. Strong ACID, strong alkali, high salt water is not suitable for preparation. Water at room temperature is ok, no necessary to heat. Dissolution is slow when the water temperature is below 5 ° C. Increasing the water temperature will accelerate the dissolution rate, but above 40 ° C will accelerate the degradation of the polymer and affect the use effect. The solution concentration is recommended to be 0.1% -0.3%.
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