The thermometer achieves thermal equilibrium by conduction or convection, so that the indicated value of the thermometer directly represents the temperature of the measured object. Generally, the measurement accuracy is high. In a certain temperature measurement range, the thermometer can also measure the temperature distribution inside the object. However, for moving bodies, small targets or objects with small heat capacity, there will be a large measurement error, commonly used thermometers are bimetallic thermometers, glass liquid thermometers, pressure thermometers, resistance thermometers, thermistors and thermocouples. They are widely used in industrial, agricultural, commercial, and other sectors. People also use these thermometers in daily life. With the wide application of cryogenic technology in national defense engineering, space technology, metallurgy, electronics, food, medicine and petrochemical and other departments and the research of superconducting technology, cryogenic thermometers measuring temperatures below 120K have been developed, such as cryogenic gas thermometers, vapor pressure thermometers, acoustic thermometers, paramagnetic salt thermometers, quantum thermometers, low-temperature thermal resistance and low-temperature thermocouples. Low temperature thermometers require small temperature sensing elements, high accuracy, good reproducibility and stability. The carburized glass thermal resistance made of carburizing and sintering of porous high silica glass is a temperature sensing element of low temperature thermometer, which can be used to measure the temperature in the range of 1.6~300K.
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The functional polymer film is applied to the ceramic substrate with conductive electrode to form a sensitive part whose impedance changes logarithmicly with the relative humidity, and the conductive mechanism is that the presence of water molecules affects the mobility of conductive ions in the inner polymer film. This product has stable and reliable performance, good product consistency, and is convenient for mass production. This product has the characteristics of high precision, high reliability, good waterproof water resistance, strong adaptability to high and low humidity, low drift, and rapid response.
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(1) Embedded light bar can not be installed directly on combustible objects Some families use three plywood lined with paint behind the ceiling lamp for aesthetic purposes, which is actually very dangerous and must be insulated; if the high-temperature parts of the lamp surface are close to combustible objects, insulation or heat dissipation measures should also be taken.
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Product Introduction: ‧Power requirements: +9V~+35Vdc ‧Power consumption: 1W ‧Isolation voltage: 3000Vdc ‧Transmission speed: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200bps ‧Connector type: 9PIN D-SUB (Receptacle) ‧Terminal type: 10PIN terminal. Accepts AWG1-#12 to #24 wires Size: (LxWxH) 4.65in x 2.79in x 0.87in (118mm x 71mm x 22mm) Weight: Approx. 130g Detailed introduction: ‧Power requirements: +9V~+35Vdc ‧Power consumption: 1W ‧Isolation voltage: 3000Vdc ‧Transfer speed: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200bps Connector type: 9PIN D-SUB (Receptacle) ‧Terminal type: 10PIN terminal. Accepts AWG1-#12 to #24 wires ‧side:(LxWxH)4.65in x 2.79in x 0.87in(118mm x 71mm x 22mm) ‧Weight: Approximately 130g
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Isolation power supply/communication module
The power isolation circuit, including a protection capacitor, a DC to DC power supply chip, a freewheeling circuit, a first resistor, a second resistor and a DC power isolation module, the protection capacitor is connected in parallel between the positive and negative poles of the input end of the DC to DC power supply chip, a series freewheeling circuit is connected between the drive end and the switch end of the DC to DC power supply chip, the output termination of the freewheeling circuit is connected to the first end of the first resistor, and the second end of the first resistance is grounded by the second resistor, The voltage feedback terminal of the DC to DC power supply chip is connected to the connection of the first resistance and the second resistance, the positive terminal of the input end of the DC power isolation module is connected to the first end of the first resistor, the negative terminal of the input end of the DC power isolation module is grounded, and the output end of the DC power isolation module provides an output voltage. It can play an isolation role and eliminate potential safety hazards.
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