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| add time： | 2016-01-14 15:56:48 |
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summary
It has many advantages, components decomposition of, convenient maintenance, replacement of wearing parts cost low far EasTone telecommunications number, high sensitivity, strong stability and interchangeability and accuracy are better. The room temperature insulation resistance of the assembled platinum thermal resistance shall be not less than 100M, and the room temperature insulation resistance of the assembled copper thermal resistance shall be not less than 50M. Widely used in petroleum, chemical and other production site with a variety of flammable, explosive gas, steam occasions.
WZ series industrial used thermal resistance as the temperature measurement sensor, usually with a temperature transmitter, regulator and display instruments, such as supporting the use, composition, process control system, with direct measurement or control of various production process - 200 500 DEG range within the liquid, steam and gas medium and solid surface temperature.
Thermal resistance is the use of material in the temperature changes in the resistance itself is also changing with the characteristics of the temperature measurement. When there is a temperature gradient in the measured medium, the measured temperature is the average temperature in the range of the temperature sensing element.
Although various thermal resistance of the shape difference is very big, but their basic structure is roughly similar, generally has the temperature sensing element, the insulating sleeve tube, the protection tube, and the junction box and so on the main parts of.
working principle
Thermal resistance is the use of material in the temperature change, the resistance is also changing with the characteristics of the temperature measurement. When the resistance changes, the instrument will display relevant resistance temperature.
Assembly type thermal resistance by the temperature sensing element, an outer protective pipe, junction box and various uses of the fixing device, wherein, two specifications of single and double support element, protective tube not only has the corrosion resistance, but also has enough mechanical strength, ensure that the product can safely be used in various occasions. Temperature measurement principle: after the heat of the wire resistance changes with temperature, the value of its thermal resistance R (T) and its relationship with the temperature T can be expressed as: R (T) =R0 (1+At+Bt2+)...... ), according to the measured resistance value check the corresponding index table can get the measured temperature value t.
Main technical parameters
Product implementation standard
IEC584
IEC1515
GB/T16839-1997
JB/T5582-91
Normal temperature insulation resistance
Thermal resistance at ambient temperature of 15 - 35 degrees C, relative humidity is less than 80%, the test voltage of 10 - 100V (DC) electrode and the insulation resistance between the outer sleeve >100M.
Measurement temperature and tolerance
model | Index number | Measuring range | Precision grade | Allowable error |
WZP | Pt100 | -200-+500 | A level | ±(0.15+0.002) ltl |
B级 | ±(0.30+0.005) ltl | |||
WZC | Cu50 Cu100 | -50-+100 | --- | ±(0.30+0.005) ltl |
