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Maintenance: No lubrication or periodic
servicing is required. Keep case exterior and
cover clean. Occasionally disconnect pres-
sure lines to vent both sides of gage to at-
mosphere and re-zero. Optional vent valves,
(bulletin S-101), should be used in perma-
nent installations.
Calibration Check: Select a second gage or
manometer of known accuracy and in an ap-
propriate range. Using short lengths of rub-
ber or vinyl tubing, connect the high pres-
sure 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 readings. If accu-
racy unacceptable, gage may be returned to
factory for recalibration. To calibrate in the
field, use the following procedure.
Calibration:
1. With gage case, held firmly, loosen bezel,
by turning counterclockwise. To avoid dam-
age, a canvas strap wrench or similar 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. 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 prop-
erly engaged in zero adjust screw.
6. Secure cover in place by screwing bezel
down snug. Note that the area under the
cover is pressurized in operation and there-
fore gage will leak if not properly tightened.
7. Zero gage and compare to test instrument.
Make further adjustments as necessary.
©Copyright 2001 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361 U.S.A.
MAINTENANCE
Caution: If bezel binds when installing, lu-
bricate threads sparingly with light oil or
molybdenum disulphide compound.
Warning: Attempted field repair may void
your warrenty. 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.
102 Indiana Highway 212
Michigan City, IN 46360
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, miss-
ing.
5. Pressure sensor, (static tips, Pitot tube,
etc.) improperly located.
6. Ambient temperature too low. For opera-
tion below 20°F, order gage with low tem-
perature, (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 interfering with helix movement.
4. Cover zero adjust shaft broken or not
properly engaged in adjusting screw.
We generally recommend that gages need-
ing repair be returned to the factory. Parts
used in various sub-assemblies vary from
one range of gage to another, and use of in-
correct components may cause improper
operation. After receipt and inspection, we
will be happy to quote repair costs before
proceeding.
Consult factory for assistance on unusual
applications or conditions.
Use with air or compatible gases only.
Printed in U.S.A. 4/01
Phone: 219/879-8000
Fax: 219/872-9057
Lit-by-Fax: 888/891-4963
FR# 12-440212-00 Rev. 3
www.dwyer-inst.com
e-mail: info@dwyer-inst.com
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