Product Manual

16
4. Prepare the instruments for re-installation the same as
new instruments. If a week or so is allowed for the
ceramic tips to become thoroughly saturated, subsequent
operations will be facilitated.
Care of Ceramic Tips
If the above directions are followed, years of trouble-free
operation can be expected from the ceramic tips. If salt
deposits do clog the pores of the tip, the speed of response to
irrigations will be slowed. This is when factory reconditioning is
recommended. To check response, prepare the instrument for
installation, wipe the ceramic tip dry with an absorbent paper
towel. Visually check the response to drying to 50 cb, by
keeping a dry portion of the towel on the ceramic tip, then
immerse in water and return gauge to zero. This should be
able to be accomplished in minutes.
An additional test is to fill instrument with clean water to the
very top of the reservoir and let drain for 24 hours with the cap
removed. If a minimum of 1" of water drains through the tip in
this period, the tip is responsive. If this drainage does not
occur, the tips should be replaced at our factory.
Vacuum Gauges
The IRROMETER vacuum gauge will give years of trouble-free
service with reasonable care. It is sealed against dirt and
moisture. The IRROMETER filler cap and hand vacuum pump
are specially designed to prevent harmful compression and
strain on the gauge movement. But it should be remembered
that the gauge has a delicate movement, similar to a watch, and
care should be exercised in handling to avoid shock or jarring.
Protect your gauges against freezing even more carefully than
the radiator of your car. When short periods of cold weather
start, the fluid in the instruments may already be at a relatively
low temperature whereas the water in the radiator is likely to
be hot.
If you suspect a gauge has been damaged, check as follows:
Remove the filler cap. The reading should drop to zero. With
the instrument filled, apply the hand vacuum pump. It should
be possible to obtain a gauge reading of 80-85 with the hand
vacuum pump (less with LT and MLT). If the gauge passes
both of these tests it is working. At higher elevations the
maximum reading will be lower (i.e. 3,500 ft. elevation, 75 cb).
If the needle does not drop back within the box at zero or if it
falls several points short of reaching 80-85, it indicates that the
gauge has been jarred slightly out of calibration.
A
plus or
minus correction may be made on the gauge crystal with wax
pencil and appropriate adjustment made in recording future
readings, if only a minor correction. This saves the cost of
repair.
Evacuating Gauge
Dry Storage
Drain Test