Capsuhelic® Differential Pressure Gages Series 4000
Measures pressure, vacuum or differential. Suitable for internal pressures up to 500 psi

The Capsuhelic® gage is designed to give fast, accurate indication of differential pressures. The gage may be used as a readout device when measuring flowing fluids, pressure drop across filters, liquid levels in storage tanks and many other applications involving pressure, vacuum or differential pressure.

Using the basic design of Dwyer's time-proven Magnehelic® gage, the Capsuhelic® contains a simple, frictionless movement that permits full scale readings as low as 0.5 inch water column. The pressure being measured is held within a capsule which is an integral part of the gage. This containment of the pressure permits the use of the gage on system pressures of up to 500 psig, even when differentials to be read are less than 0.1 inch W.C.

The diaphragm-actuated Capsuhelic® gage requires no filling liquid which might limit its outdoor applications. Zero and range adjustments are made from outside the gage, and there is no need to disassemble the gage in normal service.

PHYSICAL DATA
Ambient temperature range: 20° to 200°F. (-7° to 93°C).
Pressure Rating: -20" Hg to 500 psig. (-68 kPa to 34 bar).
Standard Ranges: See chart below.
Accuracy: Plus or minus 3% of full scale at 70°F(21°C). (2% on 4000S models, 4% on 4200, 4210, 4215, 4220, 4300, 4400, and 4500).
Housing: Die cast aluminum with impregnated hard coating, standard. Optional forged brass housing is required for water or water based fluids. For corrosive gases or liquids and for special diaphragms, contact the factory.
Exterior Finish:Dark gray.
Connections: ¼" NPT(F) high and, low pressure taps, duplicated -one pair top for air and gas, and one pair bottom for liquids.
Standard Accessories: Two ¼" NPT plugs for duplicate pressure taps, four flush mounting adapters with screws and four surface mounting screws.
Dimensions: 5" (127 mm) diameter x 3 3/32" (78 mm) length.
Weight: 3 lbs., 3 oz. aluminum case; 7 lbs., 13 oz. (3.5 kg) brass case.

MOUNTING
Capsuhelic^® gages may be flush mounted in a panel or surface mounted. Hardware is included for either. For flush mounting, a 4 13/16" diameter cutout in panel is required. Where high shock or vibration are problems, order optional A-496 Heavy Duty flush mount bracket. Optional A-610 kit provides simple means of attaching gage to 1¼ - 2" horizontal or vertical pipe. Installation is same as Magnehelic^® gage. All standard models are calibrated for vertical mounting. Gages with ranges above 5 in. w.c. can be factory calibrated for horizontal or inclined mounting on special order.

1. Bezel provides flange for flush mounting.
2. O-ring seal for cover assures dust tight integrity of case.
3. Clear plastic front cover is highly resistant to breakage. Provides undistorted viewing of pointer and scale.
4. Precision scale, litho-printed on aluminum, is accurate and easy to read.
5. Red tipped pointer of heat treated aluminum tubing is easy to see. It is rigidly mounted on helix shaft.
6. Pointer stops of molded rubber prevent pointer over-travel without damage.
7. Samarium cobalt magnet mounted at end of range spring rotates helix without mechanical linkages.
8. "Wishbone" assembly provides mounting for helix, helix bearings and pointer shaft.
9. Thin wall magnetic "window" is well braced and of minimum area for maximum pressure capability.
10. Jeweled bearings for helix are shock-resistant mounted. They provide virtually friction-free rotation for helix. Rotation is damped with high viscosity silicone fluid.
11. Helix is precision milled from an alloy of high magnetic permeability. Mounted in jeweled bearings, helix rotates to align with magnetic field of magnet and transmit pressure indication to pointer.
12. Zero adjustment screw is conveniently located in plastic cover, accessible without removing cover. O-ring seal provides dust seal.
13. Range spring calibration is screw adjusted. Rate adjust and rate adjust lock are coaxial and are factory set and sealed.
14. Top low pressure connection (for Air or Gas) connects to chamber in back of diaphragm. High pressure air or gas port (cut away; not shown) connects with chamber in front of diaphragm through passageways in case.
15. Precision made case is offered in two materials. Standard is die cast aluminum coated inside for resistance to most oils and similar fluids. Optional forged brass case is recommended when using water or water based liquids. One case size for all pressure ranges--can be either surface or flush mounted.
16. Silicone rubber diaphragm with integrally molded O-ring is sealed between the case and backplate. Diaphragm motion is restricted to prevent damage due to over-pressure. Double convolution allows choice of effective areas to suit range at time of assembly.
17. Diaphragm support plate of stainless steel minimizes position or attitude sensitivity.
18. Calibrated range spring is a flat leaf of stainless steel. Small amplitude of motion assures consistency and long life. It reacts to pressure on diaphragm. Live length factory adjusted for calibration.
19. Range spring mounting plate provides mounting for rate adjust screw and for the calibration range spring and magnet assembly.
20. Bottom high pressure connection (for Liquids) connects to chamber in front diaphragm. Low pressure liquid connection (not visible) connects with chamber in back of diaphragm through passageways in case.

SERIES 4000 CAPSUHELIC^® - MODELS AND RANGES
The models listed below will fulfill most requirements. Custom models can be provided for OEM customers. For special units with scales reading in ounces per square inch, inches of mercury, other metric units, etc., contact the factory.