Bimetallic thermometer installation requirements

Should be paid attention to for the installation of the bimetallic thermometer, temperature measurement accuracy, safety examination and maintenance is convenient, and does not affect the equipment operation and production operations, to meet the above requirements, in the choice of thermal resistance of the installation site and insertion depth to pay attention to the following points: ( 1) In order to make the measurement of thermal resistance end and have good heat exchange between the measured medium, should be a reasonable choice of observation, try to avoid the valve, elbow and pipe and equipment near the corner of installing heat resistance. ( 2) With a protective casing thermal resistance of heat transfer and heat loss, in order to reduce the measurement error, thermocouple and thermal resistance should have enough insert depth: a, for heat resistance temperature center fluid, usually should be measuring end is inserted into the pipe center ( Vertical or inclined installation) 。 As the current body of pipe diameter is 200 mm, the thermal resistance should choose insert depth 100 mm; B, for high temperature and high pressure and high velocity of temperature measurement, Such as main steam temperature) , in order to reduce cases of fluid resistance and prevent cases break under the action of a fluid, can take protecting tube shallow inserted way or use hot shell heat resistance. Shallow inserted type thermal resistance to protect casing, and its depth into the steam pipe should be no less than 75 mm; On a hot resistance standard insert depth of 100 mm; C, if is need to measure the temperature of flue gas, although the flue is 4 m in diameter, the heat resistance of insertion depth of 1 m; D, when measuring the original insertion depth of more than 1 m, shall be installed vertically, as far as possible or add racks and protect casing. 双金属温度计的安装,应注意有利于准确的温度测量,安全检查和维护方便,不影响设备的操作和生产操作。 必须满足以上要求。 以下几点应该注意在选择安装位置和热敏电阻的插入深度:( 1) 为了提供足够的热能交换之间的热阻的测量端和被测介质,测点的位置应合理选择和安装阀门附近的热阻,弯曲和管道和设备的死角应该尽量避免。 ( 2) Thermothermal电阻与防护套管传热和散热损失。 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:A) 热电阻测量流体温度的管道的中心,测量端通常应该插入管道的中心( 垂直或倾斜安装) 。 如果测量流体的管道的直径是200毫米,热敏电阻插入深度应100毫米; B) 温度测量的高温、高压和高速液体( 如主蒸汽温度) ,为了减少阻力的防护罩流体和防止覆盖保护层的破坏作用下液体,保护管插入浅或热的热阻盖使用。 浅插入耐热保护套管的深度不得小于75毫米主蒸汽管道; 标准的耐热性的插入深度是100毫米; C,如果有必要测量烟道烟气的温度,虽然烟道直径4米,热阻可以插入的深度1米; D) 当插入原始测量的深度超过1 m,应当尽可能垂直安装或支撑架和保护套。