When the readings are complete, the pres-
sure should be removed and the zero setting
of Microtector
®
rechecked. Any change in the
zero position will indicate inaccurate readings.
Should this happen, the zero-set and pres-
sure measurement procedure should be
repeated.
Negative Pressure
or Vacuum Measurement
Zero the gage. Connect the source of vacu-
um or negative pressure to the right-side
gage connection (Item 5) and proceed as
described under Positive Pressure
Measurement section. Remember that the
pressure measured in this way is negative.
Differential Pressure Measurement
Differential pressures may be measured by
connecting the higher (more positive) pres-
sure to the left connection (Item 2) and the
lower pressure to the right connection (Item
5).
Storage
Turn meter circuit switch to “off” position and
withdraw the point well clear of fluid (by turn-
ing micrometer clockwise) when gage is not in
use. This will conserve the batteries and min-
imize build-up of oxides, etc., on the point.
Keep the unit covered and in an area free of
strong solvent fumes.
Maintenance
When the meter reading becomes reduced or
the pointer movement gets sluggish (with the
circuit on and the point in fluid), the following
should be done:
(1) Remove the point (by unscrewing) and
clean the tip lightly using fine crocus cloth.
Wipe off all grit and dirt with a clean rag;
reassemble and recheck meter operation.
(2) If the meter operation continues to be
sluggish, replace the size AA, 1.5 volt battery.
(Replace the battery at least once a year to
avoid deterioration of battery and damage to
gage. Leakproof alkaline battery is recom-
mended.)
To replace the battery, remove center screw
(Item 10) located in the back of the electronic
enclosure. Cover (Item 9) will come off,
exposing the battery. Pull the old battery out
and push a new battery into the battery hold-
er with the positive (center) terminal to the
right (to the end marked with + on the holder).
If the fluid becomes contaminated and
requires replacement: empty old fluid from
gage; flush out with clear water and replace
with distilled water and Dwyer A126 fluores-
cein green color concentrate mixed with 3/4
oz. concentrate to each quart of water.
CAUTION:
1. Do not substitute other gage fluids, as
proper gage operation depends on use of the
specified gage fluid to provide proper surface
tension, wetting ability and electrolyte capa-
bility with unity specific gravity.
If the gage bore is very dirty, a mild soap solu-
tion may be used to aid in cleaning prior to
flushing with clear water.
2. Do not clean with liquid soaps, special sol-
vent, de-greasers, aromatic hydrocarbons,
etc. Such cleaners and solvents may contain
chlorine, fluorine, acetone and related com-
pounds that will permanently damage the
gage and prevent proper operation.
©Copyright 2005 Dwyer Instruments, Inc Printed in U.S.A. 10/05 FR# 38-440190-00 Rev. 7
D-57 10/5/05 3:59 PM Page 4
