HSA diaphragm seal · Hygienic process connections · Food, beverage & pharmaceutical
Sanitary Diaphragm Seal
Flush pressure isolation for sanitary piping systems and vessel connections.
The Haygor HSA pairs a flush diaphragm with Tri-Clamp, Cherry Burrell I-Line, Varivent, DIN 11851, SMS 1145, or tank-spud process connections. Select the connection, size, material, instrument interface, surface finish, and documentation around the actual product and cleaning process.
- Six published sanitary connection families
- 316/316L stainless steel or Alloy C-276
- Electro-polish and material-certificate options
Quick answer
What is a sanitary diaphragm seal?
A sanitary diaphragm seal is a pressure-isolation device designed for hygienic process connections. The process-facing diaphragm separates food, beverage, pharmaceutical, and other sanitary media from the pressure instrument while a sealed fill fluid transmits the pressure signal.
The HSA provides connection choices for clamp, union, threaded, and tank installations. Its flush diaphragm reduces the exposed process geometry at the measurement point, while the selected fitting, gasket, clamp, surface finish, material, and installation determine whether the completed assembly fits the plant's hygienic and cleaning requirements.
Hydraulic pressure transfer
How the HSA sanitary seal works
The HSA creates a process-facing sanitary interface while hydraulically transferring pressure to a compatible instrument.
- 1
The sanitary connection joins the process
The selected clamp, I-Line, Varivent, threaded union, SMS union, or tank spud mates to the plant connection.
- 2
Process pressure acts on the diaphragm
The flush metallic diaphragm deflects in response to pressure while separating the media from the instrument.
- 3
Fill fluid transfers the pressure signal
A sealed hydraulic fill carries the diaphragm movement to the attached instrument or remote capillary.
- 4
The instrument measures without direct contact
The gauge, transmitter, switch, or controller receives pressure while remaining isolated from the sanitary process media.
Application fit
Sanitary pressure isolation for clean-process systems
Haygor publishes the HSA for sanitary food, beverage, and pharmaceutical applications and for multiple hygienic piping and tank connection standards.
Where the HSA can fit
- Food and beverage process lines
- Dairy and liquid-product systems
- Pharmaceutical and life-science equipment
- Sanitary tanks and vessels
- Skids using clamp, union, or threaded sanitary connections
Selection conditions to verify
- Exact sanitary standard, nominal size, and mating dimensions
- Product media, concentration, allergen or contamination controls
- Cleaning method, chemistry, temperature, pressure, and exposure time
- Wetted material, gasket, surface finish, drainage, and orientation
- Instrument range, fill fluid, ambient conditions, and response needs
Common hygienic settings
Pressure measurement where cleanability and isolation matter
- Food processing
- Beverage
- Dairy
- Pharmaceutical
- Biotech
- Sanitary skids
Published configuration envelope
HSA connection families and size selections
The selections below summarize Haygor's published HSA ordering guide. The guide does not state one universal pressure or temperature rating for every sanitary configuration; confirm the completed assembly for the actual process and cleaning cycle.
Tri-Clamp
Published in 1.5, 2.0, 2.5, 3.0, and 4.0-inch selections.
Cherry Burrell I-Line
Published in 1.5, 2.0, 2.5, 3.0, and 4.0-inch selections.
Varivent
Published DN25 Type F and DN40 Type N selections.
DIN 11851 threaded
Published DN25, DN32, DN40, and DN50 selections.
SMS 1145 union nut
Published 1.5 and 2.0-inch selections.
Tank spud
Industry-standard spud with 2 or 6-inch extension selections.
| Code | Connection type | Published selections |
|---|---|---|
| A | Tri-Clamp | 1.5, 2.0, 2.5, 3.0, 4.0 in. |
| B | Cherry Burrell I-Line | 1.5, 2.0, 2.5, 3.0, 4.0 in. |
| D | Varivent connection | DN25 Type F; DN40 Type N |
| E | DIN 11851 threaded connection | DN25, DN32, DN40, DN50 |
| F | SMS 1145 union nut | 1.5 and 2.0 in. |
| C | Industry-standard tank spud | 2 or 6 in. extension |
Connection names identify the published Haygor ordering selections. Verify the exact standard revision, mating component dimensions, gasket, clamp or union, pressure-temperature capability, surface finish, and certificate scope before release.
Configure the complete sanitary assembly
Connection, material, finish, instrument, and documentation
The seal is one part of a hygienic pressure-measurement system. Specify the process connection and cleaning environment before finalizing the instrument and fill system.
Choose the connection
Identify Tri-Clamp, I-Line, Varivent, DIN 11851, SMS 1145, or tank spud, including the applicable nominal size and mating standard.
Choose wetted materials
Select 316/316L stainless steel or Alloy C-276 against the process product, cleaning chemistry, concentration, temperature, and exposure time.
Define finish and hardware
State surface-finish requirements, electro-polish option, gasket, clamp or union hardware, tank-spud material, and installation orientation.
Complete the instrument system
Define instrument model and range, weld or NPT connection, direct or remote mounting, capillary, fill fluid, response, and ambient conditions.
Published material and hardware choices
Match the HSA to the product and cleaning cycle
- Body: 316/316L stainless steel or Alloy C-276
- Diaphragm: 316L stainless steel or Alloy C-276
- Lower weld spud: none/not required, 316/316L stainless steel, or Alloy C-276
- Tank-spud gasket: ethylene propylene for Type C
- Instrument connection: weld, 1/4 NPT, or 1/2 NPT
- Options: stainless clamp for Type C, electro-polish, MTR package
The ordering guide lists no gasket supplied for Types A and B. Specify the mating gasket and clamp or union as part of the installation rather than assuming they are included.
Scope matters
Do not treat “sanitary” as a blanket certification claim
Haygor's published 2021 certificate identifies specific HSA A/B/C/D model combinations and the lower tank spud. DIN 11851 and SMS 1145 connection codes are catalog selections but are not named in the certificate model-designation line reviewed for this page. Verify renewed or current certification, the exact order code, plant standard, and installation requirements.
Published dimensional drawings
HSA Tri-Clamp, I-Line, and tank-spud dimensions
Dimensions are in inches and reproduce Haygor's published tables. The source tables do not list every catalog size; request order-specific dimensions where a size is omitted.
| Size | A | B |
|---|---|---|
| 1.5 in. | 1.98 in. | 2.05 in. |
| 2.0 in. | 2.51 in. | 2.05 in. |
| 3.0 in. | 3.57 in. | 2.05 in. |
| 4.0 in. | 4.68 in. | 2.05 in. |
| Size | A | B | C | D |
|---|---|---|---|---|
| 1.5 in. | 1.90 in. | 2.00 in. | 1.74 in. | 0.20 in. |
| 2.0 in. | 1.90 in. | 2.64 in. | 2.24 in. | 0.26 in. |
| 3.0 in. | 1.90 in. | 3.88 in. | 3.31 in. | 0.31 in. |
| 4.0 in. | 1.90 in. | 4.88 in. | 4.30 in. | 0.31 in. |
| Extension length | A | B |
|---|---|---|
| 2 in. | 2.10 in. | 2.10 in. |
| 6 in. | 6.10 in. | 6.10 in. |
The published Tri-Clamp and I-Line dimension tables omit the cataloged 2.5-inch row. Confirm the current drawing and order-specific dimensions with Haygor before fabrication or replacement work.
Compare process interfaces
Related Haygor diaphragm seals
Compare the sanitary HSA with other flush, flanged, threaded, and specialty interfaces when the process connection or industry standard calls for a different geometry.
Frequently asked questions
Sanitary diaphragm seal FAQ
These answers summarize Haygor's published HSA information and the certificate document hosted by Haygor. Final selection requires review of the sanitary connection, process, cleaning method, seal, instrument, fill system, and certificate scope.
Ask Haygor a technical questionWhat is a sanitary diaphragm seal?
A sanitary diaphragm seal isolates a pressure instrument from hygienic process media. Process pressure acts on a flush diaphragm, and a sealed fill fluid transfers that pressure to the instrument without allowing the process media to enter the gauge, transmitter, switch, or controller.
Which sanitary connection types are available for the Haygor HSA?
Haygor publishes Tri-Clamp, Cherry Burrell I-Line, Varivent, DIN 11851 threaded, SMS 1145 union-nut, and industry-standard tank-spud configurations. Connection availability depends on the selected type and size.
Which HSA sizes are published?
Published inch selections include 1.5, 2.0, 2.5, 3.0, and 4.0 inches for specified Tri-Clamp, I-Line, and SMS configurations. Haygor also lists Varivent DN25 and DN40 selections, DIN 11851 DN25 through DN50 selections, and an industry-standard tank-spud selection.
What tank-spud extension lengths are available?
The HSA ordering guide lists 2-inch and 6-inch extension lengths for Type C tank-spud seals. Confirm vessel geometry, weld-spud material, installation details, and the required insertion or stand-off before ordering.
Which instrument connections are available?
The HSA ordering guide lists a weld instrument connection, 1/4-inch NPT, and 1/2-inch NPT. The instrument, range, direct or remote mounting, capillary, and fill fluid should be selected as one pressure-measurement system.
Which body and diaphragm materials are published?
Haygor lists 316/316L stainless steel and Alloy C-276 for the HSA body, diaphragm, and optional lower weld-spud selections. Material compatibility must be reviewed against the actual product, cleaning chemistry, concentration, temperature, and exposure time.
Which HSA options are published?
Published options include a stainless-steel clamp for Type C tank-spud configurations, electro-polishing, and material certification with material test reports. Confirm the required surface finish, documentation, gasket, clamp, and connection standard in the final order.
What 3-A qualification documentation has Haygor published for the HSA?
Haygor hosts 3-A RPSCQC Certificate No. 71, initially issued June 7, 2021 and marked valid through December 31, 2021. It lists specified HSA A, B, C, and D model combinations and the lower tank spud. Treat it as published historical documentation and verify renewed or current certification, exact order-code scope, installation, and cleaning requirements with Haygor.
What information should I provide for an HSA quote?
Provide the sanitary connection standard and size, tank-spud length if applicable, process product and cleaning chemicals, operating and cleaning temperatures, operating and maximum pressure, instrument model and range, direct or remote mounting, wetted materials, surface-finish requirement, gasket and clamp requirements, fill-fluid constraints, and documentation or certification needs.
Move from sanitary connection data to an HSA configuration
Configure a sanitary diaphragm seal or send the complete hygienic application to Haygor.
Use the configurator for a guided starting point, or request a quote for connection standard, size, tank-spud length, wetted material, surface finish, gasket and hardware, instrument, fill fluid, cleaning conditions, and certificate review.