2 GENERAL FEATURES
2.1General
Temperature measurements of a liquid or gaseous compound have been successfully made with thermoelectric or expansion thermometers thanks to the good thermal exchange of the sensor with the fluid.
With solid bodies a good thermal exchange is difficult to be obtained and an additional measuring error should be considered.
A direct contact measurement is impractical when the object being measured is moving, it cannot be touched with a thermoelectric sensor because of electrical hazard or of other reasons.
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Also other applications benefit because
2.2Optical System
The optical system is equipped with a main objective to focus the infrared energy into the infrared detector through a single lens, a filter and a field stop which defines the visual cone and therefore the target dimensions.
As the detector is placed in the focal point of the measurement portion of the optical system no focusing operations are required.
A secondary, but extremely important objective, is the correct pinpointing of the target as described below. The optical diagrams are shown in the previous specification section.
2.3Target pinpointing
A correct aiming at the target is an important factor of a
The following types of pinpointing are available :
•A “V” groove on the up side of the instrument can be used stretching the arm.
•Twin laser pointers to define, at distance, the measurable target dimensions. Two versions are available with crossing or parallel twin lasers. The twin crossed lasers are suggested for target distance upper than 5 meters.
•Combination of twin lasers and direct telescope viewing for universal applications mainly required for a high distance targets (more than 10 meters) and high temperature targets (more than 1000 °C) where laser spots are not visible .
•Combination of twin lasers and a red point pinpointing for universal applications mainly required for high temperature target where laser spots are not visible
With a laser pinpointing the operation of the instrument is extremely simplified. You simply aim at the target and read the temperature.
The installation procedures for telescope and red point pinpointing, please refers to the dedicated chapters.
2.4Taking measurements
OSP portable thermometers are accurate, rugged and compact.
Its modern and practical design allows an easy handling and aiming, either at arm length or using a tripod mount, to obtain current temperature value, average, minimum, maximum and difference temperature measurement values.
Its analogue to digital outputs allows a continuous documentation on a continuous trace recorder or on a serial printer.
Using the keyboard it is also possible to enable the instrument to measure one of the computed values in addition to the actual temperature value measurement:
MAX | maximum temperature recorded during current measurement |
MIN | minimum temperature recorded during current measurement |
DIF | difference between MAX and MlN |
AVG | average temperature for entire measurement |
Tamb | ambient temperature |
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