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Precautions During Use

General Precautions for Temperature and humidity sensor

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Operating temperature

more at offset + 3% RH).It is possible to recover quickly to a normal state by a long period of time baking of 60 °C (60 hours or range in the specification range.This offset will return to the normal state is voluntarily slowly easing by returning the standard detection environment that installed a long time under extreme conditions.of standard detection (especially high humidity in excess of RH 80%). Please do not use the sensor in an 60 hours) is applied to temporarily humidity (RH) signal for a long period of time is placed outside the range The sensor works stable within the range of the standard detection, but it is that the offset (3% RH + after 60 hours) is applied to temporarily humidity (RH) signal for a long period of time is placed outside the range of standard detection (especially high humidity in excess of RH 80%). Please do not use the sensor in an environment that installed a long time under extreme conditions.
This offset will return to the normal state is voluntarily slowly easing by returning the standard detection range in the specification range.
It is possible to recover quickly to a normal state by a long period of time baking of 60 °C (60 hours or more at offset + 3% RH).

Storage environment

If you do not want to use the sensor, please keep the following conditions in order to maintain the accuracy.
Temperature range : 10 to 50 °C
Humidity range : 20 to 60% RH
Do not use antistatic polyethylene bag (light blue, pink or rose color).

Influence of temperature

The value of the relative humidity will be strongly dependent on the temperature. If you want to measure the temperature and humidity of the surroundings, please check that there are no heat-generating components to the mounting surface.

Organic gas

The humidity sensor makes the detection of water molecules, but can sometimes detect other gases.
When the sensor portion is prolonged exposure to an atmosphere of high concentration of gaseous solvent, it can cause contamination of the sensor detection unit.
In order to bring out the high performance of the sensor, please stop use or store in a place like that gas emissions.

Influence from light

The sensor is not light sensitive.
However, prolonged exposure to direct sunlight or strong UV radiation will shorten the life of the sensor.
of the filter.

Maintenance

Detection unit is protected by the filter. If the terrible dirt of filter due to dust, please clean it can cause clogging of the filter.

About the operating environment

Avoid using the sensors outdoor, in locations exposed to direct sunlight, or in locations where the temperature may vary rapidly and repeatedly. Otherwise, the internal parts and the case may deteriorate.
Avoid using the sensors in locations where chemical, organic solvents or other such materials may splatter.



General Precautions for Infrared Temperature Sensors

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Emissivity (ε)

The infrared energy emitted from the measurement target has a specific emissivity according to its composition and surface finish.
The emissivity of a material becomes closer to 1.0 for substances which readily emit infrared radiation (surfaces that are not glossy and reflective), whereas it becomes closer to 0 for materials that do not readily emit infrared (such as the polished surfaces of metals).
For normal applications, the standard emissivity of 0.95 can be used. When improved accuracy of temperature measurement is needed, however, the emissivity should be accordingly coordinated.

Field of View (FOV)

All the measurement targets need to be measured at a distance in which the target object image size equals or exceeds the FOV. When the target object size is larger than the FOV, the temperature can be immediately measured, regardless of the distance. The condition in which the measurement target is too small to satisfy the FOV conditions is sometimes referred to as “FOV chipping,” which does not allow accurate temperature measurement because it could also include measurements of non-target areas.

Detection surface

Dirt, dust or flaws on the detection window may affect normal operation.
Lightly wipe off dirt using a dry cloth. Do not use organic solvents such as paint thinner.

Effects of Water Vapor

A large amount of moisture in the air between the measurement target and the sensor may absorb infrared rays, resulting in a measured temperature lower than actual.

Metal measurement

Shiny or polished metals are generally difficult to measure due to their low emissivity. In this case, using black tape or paint spray allows measurement.

Measurement through glass

Normally quartz glass becomes more opaque as the infrared wavelength becomes longer with a larger emission (absorption). Temperature measurement through glass is therefore not available because in this case it measures the temperature of the glass surface.

Environmental temperature change

Abrupt change in the ambient temperature (Ta) causes measurement errors. Avoid abrupt temperature change.

Usage environment

Avoid use or storage of the sensors in a place exposed to; splashes of chemicals or corrosive gasses, abrupt temperature changes, direct sun, vibrations, or impacts.
Dew condensation or freezing may also influence performance.

 

 

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