CAMCORP Baghouse Collector - Manual (Page 32)

MAINTENANCE
BULLETIN NO. A-27
Page 3
Maintenance: No lubrication or periodic servic-
ing is required. Keep case exterior and cover
clean. Occasionally disconnect pressure lines to
vent both sides of gage to atmosphere and re-
zero. Optional vent valves, (bulletin S-101),
should be used in permanent installations.
Calibration Check: Select a second gage or
manometer of known accuracy and in an appro-
priate range. Using short lengths of rubber or
vinyl tubing, connect the high pressure side of the
Magnehelic gage and the test gage to two legs of
a tee. Very slowly apply pressure through the
third leg. Allow a few seconds for pressure to
equalize, fluid to drain, etc., and compare read-
ings. If accuracy unacceptable, gage may be
returned to factory for recalibration. To calibrate in
the field, use the following procedure.
Calibration:
1. With gage case, P/N 1, held firmly, loosen
bezel, P/N 4 by turning counterclockwise. To
avoid damage, a canvas strap wrench or simi-
lar tool should be used.
2. Lift out plastic cover and "O" ring.
3. Remove scale screws and scale assembly. Be
careful not to damage pointer.
4. The calibration is changed by moving the
clamp, P/N. 70-b. Loosen the clamp screw(s)
and move slightly toward the helix if gage is
reading high, and away if reading low. Tighten
clamp screw and install scale assembly.
5. Place cover and O-ring in position Make sure
the hex shaft on inside of cover is properly
engaged in zero adjust screw, P/N 230-b.
6. Secure cover in place by screwing bezel down
snug. Note that the area under the cover is
pressurized in operation and therefore gage
will leak if not properly tightened.
7. Zero gage and compare to test instrument.
Make further adjustments as necessary
Caution: If bezel binds when installing, lubricate
threads sparingly with light oil or molybdenum
disulphide compound.
Warning: Attempted field repair may void your
warranty, Recalibration or repair by the user is not
recommended. For best results, return gage to
the factory. Ship prepaid to:
Dwyer Instruments, Inc.
Attn. Repair Dept.
55 Ward St.
Wakarusa, IN 46573
Trouble Shooting Tips:
• Gage won't indicate or is sluggish.
1. Duplicate pressure port not plugged.
2. Diaphragm ruptured due to overpressure.
3. Fittings or sensing lines blocked, pinched, or
leaking.
4. Cover loose or "O" ring damaged, missing.
5. Pressure sensors, (static tips, Pitot tube, etc.)
improperly located.
6. Ambient temperature too low. For operation
below 20°F order gage with low temperature,
(LT) option.
• Pointer stuck-gage can't be zeroed.
1. Scale touching pointer.
2. Spring/magnet assembly shifted and touching
helix.
3. Metallic particles clinging to magnet and inter-
fering with helix movement.
4. Cover zero adjust shaft broken or not properly
engaged in P/N 230-b adjusting screw.
We generally recommend that gages needing
repair be returned to the factory. Parts used in
various sub-assemblies vary from one range of
gage to another, and use of incorrect compo-
nents may cause improper operation or failure.
Gages repaired at the factory are carefully cali-
brated and tested to assure "like-new" operation.
After receipt and inspection, we will be happy to
quote repair costs before proceeding.
Consult factory for assistance on unusual appli-
cations or conditions.
Use with air or compatible gases only.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A .
Telephone 219/879-8000
Fax 219/872-9057
Lit-by-fax: 888/891-4963 www.dwyer-inst.com
e-mail: [email protected]