Casella CEL Fortin barometer - Manual (Page 10)

HB3121
10
MAINTENANCE
No attention should be necessary to a barometer except to dust it and to keep the
adjusting screw clean and lightly oiled. The three bottom adjusting screws should
be occasionally slackened off and re-adjusted to make sure the barometer has not
been disturbed. No attempt should be made to clean the scale, since the silver is
protected by a lacquer which will be damaged by rubbing and allow air to penetrate
to the silver which will quickly tarnish.
Casella’s in house service department offers a comprehensive range of repair and
calibration services designed to effect a fast and efficient back up for all our
products. The service department is operated under the scope of our BSI
registration for products manufactured by us. We will however, undertake the
repair of other manufactures equipment.
For further information please contact our service department at our Bedford
headquarters. We will be happy to provide quotations for individual repairs or
provide annual maintenance under contract.
NOTES
If by any mischance the barometer tube arrives broken and the barometer is to be
sent back for repair, we would appreciate if the following points could be attended
to before returning the case to us.
Remove the barometer from the case and take off the tip. All the mercury should
then be emptied out together with any pieces of broken tube. Particular care
should be exercised to remove all the mercury from the scale and from any pieces
of exposed brass. These precautions will preserve the frame from corrosion by the
mercury and enable a repair to be effected. If this is not done the brass tube can be
badly corroded as not to be possible to repair.
If it is found at any time that air has entered the vacuum space it can quite often be
removed by first making the barometer portable slowly inclining the barometer and
then inverting it. Gentle tapping when inverted will often cause the air bubble to
travel up the tube so that escapes into the cistern. When the bubble is small it may
not travel freely and continued tapping may be necessary to remove it.
A barometer once installed requires practically no attention and will last in good
condition for many years.