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R4 Thermometer
5
Maintenance
Thermometer maintenance consists mainly of ensuring that the front lens
remains clean and free from contamination.
If the lens becomes dirty, it is recommended that a soft, lint-free cloth and a
suitable lens cleaning fluid is used to clean any contamination from the lens
surface.
Should it be found that the lens becomes repeatedly dirty, it may be
necessary to utilise an air purge accessory which can be supplied by Land
Instruments. Contact Land Instruments International for more information
regarding available accessories.
If the thermometer is used in conjunction with a protective cooling jacket,
ensure that there is an adequate supply of coolant. The recommended flow
rate for coolant is 1 litre per minute (1l/min or 0.035cuft/min).
If the thermometer is to be used in conjunction with an air purge accessory,
ensure that there is an adequate supply of clean, dry air. The recommended
flow rate for purge air is 1 litre per second (1l/sec or 2cuft/min).
Warning
Never 'over-cool' the thermometer as this may result in condensation
either on or inside the thermometer.
To prevent over-cooling, ensure that the water supply temperature is
not lower than the local dewpoint temperature.
Page 8
User Guide
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