Ametek Land RT83B Panduan Pengguna - Halaman 8

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RT8B

The AMETEK Land RT8B thermometer operates by sensing radiation from within a well

defined 'field of view'. The intersection of this field of view with the intended target,

determines the 'target spot', the area where the temperature is measured. Fig. 3 shows

the RT8B thermometer target spot size table.

2.4 Thermometer Installation

The location of the RT8B thermometer should be carefully chosen, such that it is

easily accessible and in a position not unnecessarily exposed to heat, fumes or liquid

spray. The sight path between the thermometer and the target, should be as free as

possible from smoke, liquid spray and from the intrusion of machinery. The axis of

the thermometer should be at right angles to the target surface, however, an angle of

up to 45° from the normal is acceptable. It is also important that the intended target

completely fills the thermometer field of view at the selected installed distance and

that no part of the sight path is obstructed.

NOTE

In some RT8B applications, a sighting tube may be required to eliminate any

unwanted reflections from entering the thermometer and to keep the sight path

clear from obstructions. Sighting tubes can also be used to create a 'stand-off',

between the thermometer and the process under observation.

When selecting a suitable sighting tube, it is important to ensure that the internal

bore of the tube is at least 25% greater than the largest target spot size over the

tubes length. All distances must be measured from the thermometer datum, which

is located at the front of the thermometer.

When choosing a suitable location for mounting the RT8B thermometer, the following

criteria should be considered:

•

If the installation area is not clean or free from dust, smoke or water spray,

then an AMETEK Land air purge system must be utilised to ensure that the

thermometer lens is kept free from such airborne contaminants. Ensure that a

suitably conditioned air supply is available.

•

If the surrounding ambient temperatures of the installation area are outside

the thermometer specification, then an AMETEK Land water cooled protective

jacket must be utilised to ensure that the thermometer operates at the specified

ambient temperature. Ensure that a suitably conditioned water supply is available.

Low Temperature Thermometer

User Guide