Hot chamber die casting is usually dominated by die casting of low-melting-point alloys, and the most important representative is zinc alloy Die Casting Products. And it mainly produces small die castings. If it is medium and large die castings, it is usually processed by Cold Chamber Die Casting. Hot chamber die casting is that when the molten metal filled into the mold cavity always flows in a closed channel, oxide inclusions are not easily involved, and the quality of the die casting is relatively guaranteed. Compared with cold chamber die casting, it has the characteristics of lower material loss and higher productivity.
SCZY has hot chamber die casting equipment as well as cold chamber die casting equipment. Hot chamber die casting is mainly used to produce zinc alloy products, and some small other alloy processing. Cold chamber die casting is used to process aluminum alloy die castings and other medium and large die castings. We separate and independently manage hot chamber die casting and cold chamber die casting, so that the utilization and service life of the equipment can be fully utilized, and product quality and production delivery can be better managed.
Hot Chamber Die Casting, Die Casting Machining, Zinc Die Casting Products, Die Casting Zinc, Pressure Casting, Die Casting Shenzhen SCZY Technology Co.,Ltd , https://www.szsccasting.com
With the development of economy and the progress of society, various types of instruments and meters have been widely used. The integrated temperature transmitter is one of them. The integrated temperature transmitter consists of a temperature measuring probe (thermocouple or RTD sensor) and a two-wire solid electronic unit. The integrated temperature transmitter is generally divided into two types: thermal resistance and thermocouple type. A simple understanding of the integrated temperature transmitter, then what are its characteristics?
What are the characteristics of the integrated temperature transmitter:
1. Super measurement performance for pressure, differential pressure, level, flow measurement;
2. Numerical accuracy: + (-) 0.05%;
3. Simulation accuracy: + (-) 0.75% + (-) 0.1% FS;
4. Full performance: +(-)0.25FS;
5. Stability: 0.25% 60 months;
6. Range ratio: 100:1;
7. Measurement rate: 0.2S
8. Miniaturized (2.4kg) stainless steel flange, easy to install;
9. The process connection is compatible with other products to achieve the best measurement;
10. The only sensor (patented technology) using H alloy sheath in the world has achieved excellent cold and thermal stability;
11. Smart transmitter with 16-bit computer
12. Standard 4-20mA with digital signal based on HART protocol, remote control 13. Support upgrades to fieldbus and field-based control technology.
What is a thermal resistance temperature transmitter? It is composed of a reference unit, R/V conversion unit, linear circuit, reverse connection protection, current limit protection, V/I conversion unit, and so on. After the temperature-resistor resistance signal is converted and amplified, the linear circuit compensates the nonlinear relationship between temperature and resistance. After the V/I conversion circuit, a constant-current signal of 4-20 mA linearly related to the measured temperature is output.
What is a thermocouple temperature transmitter? It is generally composed of a reference source, cold junction compensation, amplification unit, linearization, V/I conversion, burnout processing, reverse connection protection, current limiting protection and other circuit elements. It is the thermal potential generated by the thermocouple through the cold-end compensation after amplification, and then cap the linear circuit to eliminate the thermal potential and temperature of the nonlinear error, and finally converted to 4 ~ 20mA current output signal. In order to prevent accidents caused by temperature control failure due to galvanic disconnection in thermocouple measurement, a power failure protection circuit is also provided in the transmitter. When the thermocouple breaks or fails to connect properly, the transmitter will output the maximum value (28mA) to make the meter cut off the power.
The integrated temperature transmitter has the advantages of simple structure, saving lead wire, large output signal, strong anti-interference ability, good linearity, simple display instrument, solid module moisture resistance, reverse connection protection and current limit protection, and reliable work. The output of the integrated temperature transmitter is a unified 4-20mA signal; it can be used with a microcomputer system or other conventional instruments. Can also be made of explosion-proof or fire-proof measuring instruments. Temperature instruments are widely used in industrial enterprises. Temperature sensors include thermocouples, thermistors, and resistance temperature detectors. IC temperature sensor includes analog output and digital output. Thermocouples are widely used because they are very strong and not too expensive. There are several types of thermocouples that cover a very wide temperature range from ?200°C to 2000°C. They are characterized by low sensitivity, low stability, medium accuracy, slow response, easy aging and drift at high temperatures, and nonlinearity. In addition, the thermocouple requires an external reference. Temperature transfer application Note: The temperature transmitter power supply must not have spikes, otherwise it is easy to damage the transmitter. The calibration of the transmitter should be performed 5 minutes after power up, and the ambient temperature should be taken into consideration. When measuring temperature (>>100°C), the sensor chamber is insulated from the junction box with a filler material to prevent the junction box from overheating the transmitter. If the sensor is used with severe interference, the enclosure should be firmly grounded to avoid interference. The power and signal output should be transmitted using shielded 10 shielded cables. The nut of the crimped wire should be tightened to ensure airtightness. Only the RWB type temperature transmitter has a 0~10mA output, which is a three-wire system. Below 5% of the range value, it is not linear due to the turn-off characteristics of the transistor. The temperature transmitter should be calibrated every 6 months. If the DWB cannot be linearly corrected due to circuit limitations, it is best to follow the instructions to select the range to ensure its linearity. 