Thermocouple temperature sensor is chosen when need to pay attention to the point

Pt100 temperature thermocouple sensor is one kind of common types of thermocouple temperature sensor measurement accuracy, simple maintenance, flexibility, high reliability, strong durability, and other advantages. When the user in selecting PT100 temperature thermocouple sensors have 4 big attention is to be aware of, project today to introduce specific PT100 temperature thermocouple sensors for everyone chooses four considerations.

(1) choose measurement range

and measurement of weight, temperature, choose humidity thermocouple sensor to determine the measurement range in the first place. In addition to weather, outside the department, temperature and humidity measurement and control of generally don't need the wet process ( 0 ~ 100% rh) Measurement.

2. Choose measurement accuracy

measurement accuracy is the most important indicator of humidity thermocouple sensor, per - Percentage for humidity thermocouple sensor is a higher level, or even better. Because to achieve different precision, the manufacturing costs vary widely, the price also differs very far. So the user must act according to actual circumstances, should not blindly pursue 'high, refined, sharp'. Such as humidity at different temperatures using thermocouple sensor, its value for consider the impact of temperature drift. As is known to all, is a function of temperature, relative humidity temperature greatly affects the relative humidity within a specified space. Each change 0. 1℃。 Will produce 0. The humidity of 5% RH changes ( Error) 。 Use occasions if difficult to achieve constant temperature, high humidity measurement accuracy is not appropriate. In most cases, if there is no precise temperature control means, or measured space is sealed, the precision of + / - 5% RH is enough. For precise control the local space of constant temperature, constant humidity, or need to track humidity change Settings at any time, and then choose + / - 3% RH thermocouple accuracy of humidity sensor. And accuracy of + / - 2% RH even calibration standard humidity generator of thermocouple sensor is also hard to do, what's more, the thermocouple sensor itself. Relative humidity measuring instrument, even at 20 ℃ - Under 25 ℃, 2% RH accuracy is still very difficult. Usually feature is given in the product information in the normal temperature ( 20℃±10℃) And clean gas measurement.

3. Consider the drift and temperature drift

in be used actually, because of the influence of the dust, oil pollution and harmful gas, use a long time, electronic moisture transfer device can produce aging, precision, electronic moisture transfer in drift amount is general in the plus or minus 2%, even higher. In general, the effective use of production vendors will indicate one calibration time is 1 year or 2 years, due to calibration.

(4), and other considerations for

humidity of thermocouple sensor is sealing, to protect the measuring accuracy and stability, and should be avoided in acid, alkali and containing organic solvents used in the atmosphere. Also avoid using dust in the larger environment. For the correct reflection to measure the humidity of the space, also should avoid the thermocouple sensors placed too close to the walls or the flow of air is not blind Angle. If the room is too large to be measured, it should be placed more than one thermocouple sensor. Some humidity thermocouple sensor to power supply requirement is higher, otherwise will affect the accuracy of measurement. Or mutual interference between the thermocouple sensor, even unable to work. When using, should according to the technical requirements to provide appropriate, conform to the requirements of the precision of power supply. Thermocouple sensor need for remote signal transmission, to pay attention to the attenuation of the signal problem. When the transmission distance of more than 200 m or more, it is recommended that the chosen frequency humidity thermocouple sensor output signal.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure thermocouple sensor, digital temperature thermocouple sensor