Capsuhelic® Differential Pressure Gauges- Series 2004

Mounting. Capsuhelic® gages may be flush mounted in a panel or surface mounted. Hardware is included for either. For flush mounting, a 4 43/l6" diameter cutout in panel is required. Where high shock or vibration are problems, order optional A-496 Heavy Duty flush mount bracket. Optional A-640 kit provides simple means of attaching gage to 4 ¼-2" 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.

Flush mounted in panel	Back view shows flush mounting adaptors.	Back view for surface mounting.

Adjustable signal flag
Integral with plastic gage cover; has external reset screw. May be ordered factory installed on gage or separately for field installation. Specify ASF suffix after model number.

A444 bleed fitting
For easier, safer purging of trapped air when using gage with liquids. Also useful for draining condensate when installed in lower ports. To open, simply loosen hex nut. Solid brass.

Forged brass case
For applications involving water or water based liquids. To order, add suffix "B" after model number. Example: 4205B.

A-474 portable kit
includes plastic case, mounting bracket, A409 3-way manifold valve, (2) A-230 high pressure hoses and all necessary fittings. Assembly required. Gage not included.

Available in bright red or green to accent critical pressure zones. Specify which color and portion of scale to be covered with each.

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. Sapphire 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, deburred and annealed in a hydrogen atmosphere for best magnetic qualities. Mounted in sapphire 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 of diaphragm. Low pressure liquid connection (not visible) connects with chamber in back of diaphragm through passage

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.