Comark RF500 Manual de usuario descargar pdf (Pagina 20)

Temperature Probes

Comark’s range of temperature probes is one of the biggest available,

and covers virtually every temperature measurement application.

Comark produces one of the largest

available ranges of temperature

probes, with a probe for almost

every application.

There is a special probe design and

build facility so if you can’t find what

you need within the standard range,

Comark can either modify an

existing probe or supply probes to

customer designs.

Probe Categories

Comark standard probes fall into four main

categories and each includes probes with

different sensor types:

Penetration probes are used for measuring

the inter

nal, or core temperatures, of solid and

semi-solid materials.

Surface probes are designed for maximum

contact with the surface to be measur

ed.

Air probes are for measuring air and gas

temperatur

es and damped sensor probes.

Immersion probes measure the temperature

of liquids and semi-solids.

Wher

e required, UKAS certificates of

calibration can be provided for probe

and thermometer combinations.

Choosing the right sensor

The choice of sensor will determine the

measurement range, the accuracy and the

response time. The sensor type must also be

compatible with the thermometer you use.

Comark standard probes use two basic sensor types:

1. Thermocouples. These consist of two wires

made of dissimilar materials joined together at the

measur

ement tip (the hot junction) and connected

at the other end to the instrument (the cold junction).

The two main thermocouples used in Comark

thermometers are Types K and T. See opposite for

thermocouple limits.

The Type K Thermocouple has a wide measurement

range and responds quickly to temperature changes.

The Type T Thermocouple also responds quickly

to temperature changes and generally provides

greater accuracy, but it is effective over a narrower

temperature range.

2. Thermistor (PST) is a semi-conductor sensor

and pr

ovides exceptional accuracy but over a much

narrower temperature range.

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