Dwyer 2000 Series Magnehelic Differential Pressure Gauge Instruction Manual
- June 10, 2024
- Dwyer
Table of Contents
Magnehelic® Differential Pressure Gage
Bulletin A-27
Instruction Manual
2000 Series Magnehelic Differential Pressure Gauge
STANDARD GAGE ACCESSORIES: Two 1/8˝ NPT plugs for duplicate pressure
taps, two 1/8˝ pipe thread to rubber tubing adapters and three flush mounting
adapters with screws.
MP AND HP GAGE ACCESSORIES: Mounting ring and snap ring retainer
substituted for 3 adaptors, 1/4” compression fittings replace 1/8” pipe thread
to rubber tubing adaptors.
OVERPRESSURE PROTECTION: Standard Magnehelic® Differential Pressure Gages
are rated for a maximum pressure of 15 psig and should not be used where that
limit could be exceeded. Models employ a rubber plug on the rear which
functions as a relief valve by unseating and venting the gage interior when
over pressure reaches approximately 25 psig (excludes MP and HP models). To
provide a free path for pressure relief, there are four spacer pads which
maintain .023˝ clearance when gage is surface mounted. Do not obstruct the gap
created by these pads.
SPECIFICATIONS
Service: Air and non-combustible, compatible gases. (Natural Gas option
available.)
Wetted Materials: Consult factory.
Housing: Die cast aluminum case and bezel, with acrylic cover. (MP model has
polycarbonate cover).
Accuracy: 2% of full scale (±3% on -0, -100PA, -125PA, -10MM and ±4% on -00,
-60PA, -6MM), throughout range at 70°F (21.1°C); High accuracy version: ±1% on
full scale (±1.5% on -0, -100PA, -125PA, -10MM and ±2% on -00, -60PA, -6MM).
Pressure Limits: -20˝ Hg to 15 psig.† (-0.677 bar to 1.034 bar); MP option: 35
psig (2.41 bar), HP option: 80 psig (5.52 bar).
Enclosure Rating: IP67.
Overpressure: Relief plug opens at approximately 25 psig (1.72 bar), standard
gages only. The blowout plug is not used on models above 180 inches of water
pressure, medium or high pressure models, or on gages which require an
elastomer other than silicone for the diaphragm.
Temperature Limits: 20 to 140°F (-6.67 to 60°C). *Low temperature models
available as special option.
Size: 4˝ (101.6 mm) diameter dial face.
Mounting Orientation: Diaphragm in vertical position.
Consult factory for other position orientations.
Process Connections: 1/8˝ female NPT duplicate high and low pressure taps –
one pair side and one pair back.
Weight: 1 lb 2 oz (510 g), MP & HP 2 lb 2 oz (963 g).
Agency Approvals: RoHS.
For applications with high cycle rate within gage total pressure rating, next
higher rating is recommended. See Medium and High pressure options.
Note: May be used with hydrogen when ordering Buna-N diaphragm.
Pressure must be less than 35 psi.
INSTALLATION
Select a location free from excessive vibration and where the ambient
temperature will not exceed 140°F (60°C). Also, avoid direct sunlight which
accelerates discoloration of the clear plastic cover. Sensing lines may be run
any necessary distance.
Long tubing lengths will not affect accuracy but will increase response time
slightly. Do not restrict lines. If pulsating pressures or vibration cause
excessive pointer oscillation,
consult the factory for ways to provide additional damping.
All standard Magnehelic® Differential Pressure Gages are calibrated with the
diaphragm vertical and should be used in that position for maximum accuracy.
If gages are to be used in other than vertical position, this should be
specified on the order. Many higher range gages will perform within tolerance
in other positions with only rezeroing. Low range models of 0.5” w.c. plus
0.25” w.c. and metric equivalents must be used in the vertical position only.
SURFACE MOUNTING
Locate mounting holes, 120° apart on a 4-1/8” dia. circle. Use No. 6-32 machine screws of appropriate length.
FLUSH MOUNTING
Provide a 4-9/16” dia. (116 mm) opening in panel. Provide a 43/4” dia. (120
mm) opening for MP and HP models.
Insert gage and secure in place with No. 6-32 machine screws of appropriate
length, with adapters, firmly secured in place.
FOR -SS BEzEL INSTALLATION
Provide a 4-9/16˝ opening in panel. Insert gage and secure with supplied mounting hardware.
PIPE MOUNTING
To mount gage on 1-1/4” – 2” pipe, order optional A-610 pipe mounting kit.
TO zERO GAGE AFTER INSTALLATION
Set the indicating pointer exactly on the zero mark, using the external zero
adjust screw on the cover at the bottom. Note that the zero check or
adjustment can only be made with the high and low pressure taps both open to
atmosphere.
OPERATION
Positive Pressure: Connect tubing from source of pressure to either of the two
high pressure ports. Plug the port not used.
Vent one or both low pressure ports to atmosphere.
Negative Pressure: Connect tubing from source of vacuum or negative pressure
to either of the two low pressure ports. Plug the port not used. Vent one or
both high pressure ports to atmosphere.
Differential Pressure: Connect tubing from the greater of two pressure sources
to either high pressure port and the lower to either low pressure port. Plug
both unused ports.
When one side of the gage is vented in dirty, dusty atmosphere, we suggest an
A-331 Filter Vent Plug be installed in the open port to keep inside of gage
clean.
A. For portable use of temporary installation use 1/8” pipe thread to rubber
tubing adapter and connect to source of pressure with flexible rubber or vinyl
tubing.
B. For permanent installation, 1/4” O.D., or larger, copper or aluminum tubing
is recommended.
MAINTENANCE
No lubrication or periodic servicing 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 should be used in permanent installations.
The Series 2000 is not field serviceable and should be returned if repair is
needed (field repair should not be attempted and may void warranty). Be sure
to include a brief description of the problem plus any relevant application
notes. Contact customer service to receive a return goods authorization number
before shipping.
WARNING
Attempted field repair may void your warranty. Recalibration or repair by
the user is not recommended.
TROUBLE SHOOTING TIPS
Gage won’t indicate or is sluggish.
- Duplicate pressure port not plugged.
- Diaphragm ruptured due to overpressure.
- Fittings or sensing lines blocked, pinched, or leaking.
- Cover loose or “O”ring damaged, missing.
- Pressure sensor, (static tips, Pitot tube, etc.) improperly located.
- Ambient temperature too low. For operation below 20°F (-7°C), order gage with low temperature, (LT) option.
1.888.610.7664
www.calcert.com
sales@calcert.com
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>