User manual

2.2. INSTRUCTIONS PRO-77ir

Connect the infrared sensor cable and insert

the batteries into the infrared sensor.

Start by inserting the plug

of the external temperature probe.

If the plug is not properly inserted or

the external probe is faulty, a 0 value

will be displayed!

After inserting the batteries, the sensor

immediatelytransmitsitsrstsensordata.

Infrared temperature measurement

Measuring temperature by infrared assumes

knowledge about the relation between emitted

infrared radiation and the temperature of the surface.

The amount of radiation is related to the material of the surface and is

expressedbytheemissivitycoefcientε.

Thiscoefcientrangesfrom0to1,wheretypicallythehumanskinhas

an emissivity near 1, as most metals have a small emissivity.

Table 1 (page 53 and 54) gives some typical values for emissivity.

Inordertomeasurethetemperatureofasurface,thecorrectcoef-

cient value should be given. Also, notice that the surface temperature

may differ from the core temperature of a (physical) body. The PRO-IR

sensorusestheemissivitycoefcienttocalculatethetemperaturefrom

received infrared radiation.

IR-Sensor

Fig. 5. Sensor placement

Fig. 4. Battery placement

Fig. 6. Sensor switches

PRO-77ir