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Installation and maintenance of bimetal thermometer
2012-2-25 8:17:06

是一种测量中低温度的现场检测仪表。 Bimetal thermometer is a kind of on-site detection instrument for measuring low and medium temperature. It can directly measure the temperature of liquid vapor and gas medium in the range of -80 ℃-+ 500 ℃ in various production processes. The main component of an industrial bimetal thermometer is a multi-layer metal sheet composed of two or more metal sheets stacked on top of each other. It works on the principle that two different metals expand differently when the temperature changes. It is based on a bimetal sheet wound into a loop shape. When one end is heated and expanded, the pointer is rotated, and the working instrument displays the temperature value corresponding to the thermoelectric potential.

的安装,应注意有利于测温准确,安全可考及维修方便,而且不影响设备运行和生产操作.要满足以上要求,在选择对热电阻的安装部位和插入深度时要注意以下几点: 1、为了使热电阻的测量端与被测介质之间有充分的热交换,应合理选择测点位置,尽量避免在阀门,弯头及管道和设备的死角附近装设热电阻. 2、带有保护套管的热电阻有传热和散热损失,为了减少测量误差,热电偶和热电阻应该有足够的插入深度:(1)对于测量管道中心流体温度的热电阻,一般都应将其测量端插入到管道中心处(垂直安装或倾斜安装).如被测流体的管道直径是200毫米,那热电阻插入深度应选择100毫米; (2)对于高温高压和高速流体的温度测量(如主蒸汽温度),为了减小保护套对流体的阻力和防止保护套在流体作用下发生断裂,可采取保护管浅插方式或采用热套式热电阻.浅插式 For the installation of bimetal thermometers , attention should be paid to the accuracy of temperature measurement, safety and ease of maintenance, and without affecting the operation and production operations of the equipment. To meet the above requirements, pay attention to the installation position and insertion depth of the thermal resistor. The following points: 1.In order to have sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the location of the measuring point should be selected reasonably, and the thermal resistance should be installed near the dead angle of the valve, elbow and pipeline and equipment as far as possible. 2. The thermal resistance with protective sleeve has heat transfer and heat loss. In order to reduce the measurement error, the thermocouple and the thermal resistance should have sufficient depth of insertion: (1) For the thermal resistance of the fluid temperature in the center of the pipeline, generally The measuring end should be inserted into the center of the pipeline (vertical installation or inclined installation). If the pipe diameter of the fluid to be measured is 200 mm, the thermal resistance insertion depth should be 100 mm; (2) For the temperature of high temperature, high pressure and high speed fluid Measurements (such as the main steam temperature), in order to reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid, a shallow insertion method of the protective tube or a thermal sleeve type thermal resistance can be adopted. Thermal resistance protective sleeve, the depth of its insertion into the main steam pipe should not be less than 75mm; the standard insertion depth of thermal sleeve thermal resistance is 100mm; (3) If it is necessary to measure the temperature of the flue gas in the flue, although the flue diameter is 4m The thermal resistance can be inserted at a depth of 1 m. (4) When the insertion depth of the measurement original exceeds 1 m, it should be installed as vertically as possible, or a support frame and a protective sleeve should be installed.
Technical parameters of bimetal thermometer:
JB / T8803-1998 GB3836-83
Nominal diameter of dial: 60, 100, 150
Accuracy grade: (1.0), 1.5
Thermal response time: ≤40S
Protection level: IP55
Angle adjustment error: The angle adjustment error should not exceed 1.0% of its range
回差应不大于基本误差限的绝对值重复性:双金属温度计重复性极限范围应不大于基本误差限绝对值的1/2 Hysteresis: The hysteresis of the bimetal thermometer should not be greater than the absolute value of the basic error limit Repeatability: The repeatability limit range of the bimetal thermometer should not be greater than 1/2 of the absolute value of the basic error limit
Product implementation standards: JB / T8803-1998? GB3836-83
Nominal diameter of dial: 60, 100, 150
Accuracy grade: (1.0), 1.5
Thermal response time: ≤40S
Protection level: IP55
Angle adjustment error: The angle adjustment error should not exceed 1.0% of its range
Hysteresis: The hysteresis of the thermometer should not be greater than the absolute value of the basic error limit Repeatability: The repeatability limit of the thermometer should not be greater than 1/2 of the absolute value of the basic error limit