的介绍新一代液体压力式温度计以及由此开发的系列化测温仪表，克服了原仪表性能单一，可靠性差以及温包积大的缺点，并将测温元件体积缩小到原来的1/30或1/60，创造性地将传感器热电阻安装于测温元件内，实现了机电一体化的测温功能。 Introduction of pressure type thermometer The new generation of liquid pressure type thermometer and the series of temperature measuring instruments developed from it have overcome the shortcomings of the original instrument's single performance, poor reliability and large temperature envelope, and reduced the temperature measuring element volume to the original / 30 or 1/60, the sensor thermal resistance is creatively installed in the temperature measurement element, and the mechatronic temperature measurement function is realized. Formed a multi-functional serial temperature meter with a liquid pressure thermometer as the basic temperature measuring instrument for remote transmission, anti-vibration, anti-corrosion, electrical contact, and temperature signal transmission. Divided into two series, ordinary type and explosion-proof type.
是利用封闭容器内的液体，气体或饱和蒸气受热后产生体积膨胀或压力变化作为测信号。 Pressure thermometers use liquid, gas or saturated vapor in a closed container to generate volume expansion or pressure change as a signal when heated. The basic structure of Jiangsu Jinhu Dongxiang consists of three parts, namely a temperature pack, a capillary tube and an indicator. It is one of the earliest methods used for temperature control in the production process. Pressure-type temperature measurement systems are still widely used in local indication and control of temperature. The advantages of Jiangsu Jinhu Dongxiang pressure thermometer are: simple structure, high mechanical strength, and not afraid of vibration. Low price and no external energy required. The disadvantages are: the temperature measurement range is limited, generally in the range of -80 ~ 400 ° C; the large heat loss has a slow response time; the instrument sealing system (temperature pack, capillary tube, spring tube) is difficult to repair and must be replaced; the measurement accuracy is affected by ambient temperature, The installation position of the temperature pack has a great influence and the accuracy is relatively low; the capillary transmission distance is limited. The normal working range of the pressure thermometer should be 1 / 2--3 / 4 of the measurement range, and the display meter and the temperature pack should be in a horizontal position as much as possible. The installation temperature of the temperature pack mounting bolts will cause temperature loss and cause inaccurate temperature. During installation, heat insulation treatment should be performed, and the temperature pack should be operated in an environment without vibration as much as possible. Pressure thermometers are spectrographs that measure fluid pressure. We usually compare the measured pressure with a reference pressure (such as atmospheric pressure or other given pressure), so the relative pressure or pressure difference is measured. Classification: According to different office principles, it can be divided into: 1, liquid column type; 2, elastic type; 3, sensor type. 1. Liquid column types such as U-tube pressure gauges and row pressure gauges are based on hydrostatic principles to convert pressure signals into liquid column height signals. Water, ethanol or metallic mercury are often used as pressure measuring fluids. 2. The elastic type, such as the Boden tube pressure gauge, converts the pressure signal into a mechanical deformation of the elastic element, and outputs the signal in the form of a pointer to change the orientation. Such pressure gauges are often used in industrial systems. 3. The principle of the pressure sensor is to convert the pressure signal into some kind of electrical signal, such as the strain type, which changes the resistance through the deformation of the elastic element; the piezoelectric type uses the piezoelectric effect.
独特的地方: What makes pressure thermometers unique:
Simple structure, high sharpness and very high accuracy. It is often used for proofing other types of pressure gauges. The shortcomings are large size, slow response and not easy to semi-automatic survey. Flexible pressure gauges are convenient to use and have a large range of pressure measurement, but their precision is low, so semi-automatic surveying is not possible. All kinds of pressure sensors can be small-scale, relatively accurate and rapid surveying. Vertical low-speed centrifuges are particularly capable of surveying dynamic pressures, successfully achieving multi-point inspections, signal changes, long-distance transmission, connection with computers, It is suitable for timely disposal and so on, so it has been rapidly progressed and widely used.