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Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Specifications
Range :
0-6kPa ～ 10MPa
Output Pressure :
0~350KPa,10~800KPa
Pressure Type :
Gauge / Absolute / Sealed Gauge
Communication Protocol :
modbus rtu
Stability :
± 0.10% of URL for 12 months
Warranty Period :
12 months
Wire :
2 wire(standard),3 or 5 wire optional
Port :
NINGBO SHANGHAI
Broken Pressure :
3XRP(rated pressure)
Power Supply :
24 V DC
Brand Name :
QINWEIYB
Model Number :
QWYB-518
Certification :
Explosion-proof certificate ，Safety certificate
Place of Origin :
China
MOQ :
1Set
Price :
Negotiable
Payment Terms :
T/T,D/P,D/A,L/C
Supply Ability :
100PCS/Month
Delivery Time :
5-8 work days
Packaging Details :
Carton
Description

Hygienic Pressure Transmitter with Tri-Clamp Connection for Food, Beverage, and Pharmaceutical Processes

1. When Cleanability Is a Measurement Specification

In a semiconductor-grade chemical plant, a standard NPT-threaded pressure connection is perfectly acceptable—there is no risk of product contamination from the instrument's internal crevices. In a dairy processing plant, that same threaded connection would be a regulatory violation waiting to happen. Milk proteins trapped in the thread gaps provide an ideal growth medium for bacteria; chemical residues from CIP (Clean-In-Place) solutions accumulate in dead spaces; and the rough surface finish prevents effective sterilization.

Hygienic pressure transmitters are designed specifically to eliminate these risks. Every surface that contacts the process medium is polished to a mirror finish (Ra ≤ 0.8 μm, often ≤ 0.4 μm), process connections are crevice-free clamp designs (Tri-Clamp, DIN 11851, VARIVENT), and the flush-mounted diaphragm leaves no cavity where product can stagnate. These instruments are certified to standards including 3-A Sanitary Standards, EHEDG (European Hygienic Engineering & Design Group), and FDA 21 CFR for food contact materials.

2. Hygienic Design Principles

  • Crevice-free construction: All product-contact surfaces are continuously welded and polished. Threads—the primary bacterial harborage point in industrial fittings—are eliminated entirely in favor of clamp connections with elastomer gaskets. The diaphragm is flush or slightly protruding; a recessed diaphragm creates a cavity that CIP spray cannot reliably reach.
  • Surface finish requirements: 3-A standards require Ra ≤ 0.8 μm (32 μin) on product contact surfaces, with electropolishing preferred. EHEDG recommends Ra ≤ 0.8 μm. Below Ra 0.4 μm, bacterial adhesion decreases markedly—a factor in aseptic processing where any microbial attachment is unacceptable.
  • Material compliance: 316L stainless steel (low carbon for weld compatibility and intergranular corrosion resistance) is the standard. For aggressive CIP chemicals (hot nitric acid, caustic), Hastelloy C-22 may be specified. Elastomer seals must be FDA-compliant: EPDM, FKM (Viton), or PTFE-encapsulated silicone, with full material traceability.
  • CIP/SIP tolerance: The transmitter must withstand repeated exposure to 85-95°C caustic and acid cleaning solutions (CIP) for 30-60 minutes, and saturated steam at 121-135°C for 30+ minutes (SIP), without diaphragm deformation, seal degradation, or fill fluid thermal expansion damage.

Application Cases

Case 1: Dairy Fermentation Tank Pressure Control

Industry: Dairy / Yogurt Manufacturing

Application: Fermentation vessel headspace pressure for controlled bacterial culture conditions

Medium: Air/CO₂ above cultured milk at 42°C

CIP/SIP: Daily CIP at 85°C (2% NaOH, then 1% HNO₃); weekly SIP at 121°C for 30 min

Customer Challenge: Previous sanitary pressure transmitter's EPDM seal degraded after approximately 200 CIP cycles, developing micro-cracks that trapped product residue. Swab testing detected bacterial counts exceeding limits during a regulatory audit.

Solution: Tri-Clamp hygienic transmitter with FKM (Viton) seal rated for 1500+ CIP cycles, Ra ≤ 0.4 μm electropolished diaphragm, integrated temperature sensor for fill fluid expansion compensation during SIP thermal shock. 3-A certified.

Result: Zero microbial detection after 800+ CIP/SIP cycles. Seal replacement interval extended from 6 months to projected 36 months. Audit findings closed. Production uptime increased—eliminated post-CIP swab failures that previously triggered re-cleaning.

Case 2: WFI (Water for Injection) Distribution Loop

Industry: Pharmaceutical

Application: Pressure monitoring across WFI circulation loop filters to detect fouling

Medium: USP-grade Water for Injection at 80°C

Customer Challenge: WFI loop must maintain positive pressure at all points to prevent backflow contamination. Sanitary filter DP monitoring required pressure transmitters at 6 points around the loop. Previous instruments required annual replacement because the constant 80°C exposure degraded the fill fluid, causing zero drift that made filter DP trending unreliable.

Solution: Hygienic pressure transmitters with DC704 high-temperature fill fluid, Tri-Clamp 1.5" connection, 316L electropolished diaphragm, Modbus RTU output for direct connection to BMS (Building Management System).

Result: Transmitter service life extended from 1 to 5+ years. Filter change intervals optimized based on actual DP trending versus fixed schedule—filter replacement frequency reduced 30%, saving $12,000/year in consumables and labor. Continuous positive pressure verification satisfied FDA aseptic processing requirements.

Technical Specifications

Measurement Range0-6 kPa to 0-10 MPa
Accuracy±0.25% FS (standard); ±0.1% FS (premium)
Process ConnectionTri-Clamp 1.5", 2"; DIN 11851; VARIVENT; SMS; RJT
Diaphragm SurfaceRa ≤ 0.4 μm, electropolished (standard); Ra ≤ 0.2 μm (aseptic)
Wetted Materials316L SST diaphragm and body; Hastelloy C-22 optional
Seal MaterialEPDM, FKM (Viton), PTFE-encapsulated silicone; FDA compliant
CIP/SIP Tolerance>1500 CIP cycles at 95°C; >500 SIP cycles at 135°C
Output Signal4-20 mA (2-wire) + HART; Modbus RTU optional
Certifications3-A 74-07, EHEDG Type EL Class I, FDA 21 CFR 177, CE
Protection GradeIP66/IP67; IP69K for high-pressure washdown

FAQ

Q: Can a hygienic transmitter replace an industrial one in all applications?

No—and the reverse is also true. Hygienic transmitters cost 1.5-2.5× more than industrial equivalents due to specialized materials, polishing processes, and certification costs. For non-hygienic applications (water treatment, hydraulic systems, general chemical), the additional cost provides no benefit. However, never install a standard industrial transmitter in a hygienic application—threaded connections, rough surface finishes, and non-FDA-compliant materials will cause audit failures, product contamination risks, and potentially regulatory action. Use hygienic transmitters only where required by the process standard (food, beverage, pharma, biotech, cosmetics) and standard industrial transmitters elsewhere.

Q: What happens to a hygienic transmitter during SIP (Steam-In-Place)?

At 135°C saturated steam, the fill fluid between the diaphragm and sensor expands by 5-15% in volume. Without design compensation, this expansion would create significant zero shift. Hygienic transmitters manage this through: (1) minimized fill fluid volume (thin oil film design), (2) temperature-resistant fill fluids (DC704, Neobee M-20), (3) diaphragm designs that accommodate thermal expansion without plastic deformation, and (4) the electronics can be configured to reject measurements during SIP (when process pressure is irrelevant) or to apply SIP-specific compensation factors. After the SIP cycle and cooling to process temperature (typically 2-4 hours), the transmitter should return to within normal accuracy specifications without recalibration.

Additional Application Cases

Case 3: Brewery Fermentation and Maturation Tank Pressure

Industry: Brewing / Beverage

Application: Fermentation vessel headspace pressure control for CO₂ saturation and foam management during lager maturation

Medium: CO₂ above beer at 8-14°C

Pressure Range: 0-2 bar(g)

CIP/SIP: Daily hot water rinse at 85°C; weekly CIP with 2% caustic at 80°C for 45 minutes; monthly acid passivation (1% HNO₃ at 60°C)

Customer Challenge: A craft brewery producing 50,000 hL/year had 24 fermentation tanks of varying ages. Older tanks used threaded industrial pressure transmitters that had been "grandfathered" from when the brewery was smaller and less regulated. A new export contract to the EU required full EHEDG compliance documentation for all product-contact instrumentation. The existing threaded transmitters failed the EHEDG assessment due to thread crevices and non-certifiable materials.

Previous Problem: 4 of 24 tanks had to be taken offline during the compliance upgrade period, representing 17% production capacity loss during peak summer demand. One tank's threaded transmitter connection harbored a persistent Lactobacillus contamination that spoiled 3 consecutive batches before the root cause was identified—loss of €45,000 in product and 2 weeks of investigative effort.

Solution: Phased installation of Tri-Clamp hygienic pressure transmitters on all 24 tanks. 3-A certified, Ra ≤ 0.4 μm electropolished diaphragm. EPDM seals for CIP chemical compatibility. 4-20 mA + HART output to brewery automation system with wireless HART adapter for tanks without existing signal wiring. Integrated tank pressure trending for fermentation progress monitoring.

Installation Location: Tank CIP arm, offset from spray ball to avoid direct impingement during cleaning cycles. 1.5" Tri-Clamp connection with PTFE gasket.

Result: EU export certification achieved 3 months ahead of schedule. All 24 transmitters installed and validated within a 2-week shutdown window. Post-installation swab testing across all tank connections: zero detections. Pressure trending data enabled brewers to optimize CO₂ saturation setpoints, reducing maturation time by 0.5 days per batch—annual capacity increase of 3% without capital expenditure.


Hygienic Standards Comparison

Standard Scope Key Requirements Typical Region
3-A 74-07 Sanitary pressure measuring devices Surface finish Ra ≤ 0.8 μm, crevice-free, cleanable, material traceability USA (dairy focus, now food/beverage broadly)
EHEDG Type EL Class I Hygienic equipment design Cleanability verified by riboflavin test, sterile design, documented CIP validation Europe (broader than 3-A, encompasses all food sectors)
FDA 21 CFR 177 Indirect food additives (polymers, elastomers) Materials must be listed as safe for food contact; migration limits defined for each substance USA (legal requirement for food contact)
ASME BPE Bioprocessing equipment Surface finish Ra ≤ 0.5 μm SF4 (mechanical polish) or SF1 (electropolish), material certification Global (biotech and pharmaceutical)
EC 1935/2004 Food contact materials regulation Materials must not transfer constituents to food in quantities that endanger human health EU (legal framework directive)

FAQ

Q: What surface finish (Ra) do I need for my application?

Ra ≤ 0.8 μm (32 μin) is the minimum for 3-A sanitary standards and is sufficient for most food and beverage applications where CIP cleaning is effective. Ra ≤ 0.4 μm (16 μin) provides measurably better cleanability—bacterial adhesion decreases by 60-80% compared to Ra 0.8 μm when measured by ATP swab tests after CIP. This finish is recommended for dairy, liquid egg, and other protein-rich products where biofilm formation risk is highest. Ra ≤ 0.2 μm (8 μin) is specified for aseptic processing and sterile product applications (injectable drugs, vaccines) where any microbial attachment is unacceptable. The cost difference: Ra 0.4 μm adds approximately 15-25% over Ra 0.8 μm; Ra 0.2 μm adds 30-50%. For most food applications, Ra 0.4 μm electropolished provides the optimal balance of cleanability and cost.

Q: How do I verify a hygienic transmitter installation is cleanable?

The EHEDG riboflavin test is the gold standard: coat the installed transmitter's product-contact surfaces with a riboflavin (vitamin B2) solution, let it dry, then run a standard CIP cycle. Inspect under UV light—any residual riboflavin fluoresces bright yellow-green, indicating a dead zone that CIP could not reach. If fluorescence is detected, adjust the transmitter position, gasket alignment, or CIP spray pattern and retest until clean. For non-EHEDG applications, a simplified verification uses ATP bioluminescence swab testing: swab the diaphragm-to-gasket junction and the gasket-to-pipe transition after CIP; ATP readings below 10 RLU indicate effective cleaning. Perform this test during initial qualification and annually thereafter as part of the hygiene monitoring program.

Q: Can I use the same hygienic transmitter for both product and CIP/SIP?

Yes—this is the standard design intent. A properly specified hygienic transmitter must handle three distinct operating regimes: (1) Process: typically 0-10 bar(g) at 2-140°C for hours to days. (2) CIP: 1-4 bar(g) at 75-95°C with aggressive chemical solutions (2-3% NaOH, 1-2% HNO₃) for 30-90 minutes. (3) SIP: saturated steam at 121-135°C, 2-3 bar(abs) for 30-60 minutes. The transmitter experiences thermal shock between these regimes—transitioning from 4°C product to 135°C SIP in 2-3 minutes. Key design features for this service: fill fluid with wide liquid range (DC704 or Neobee M-20), diaphragm welded (not clamped) to prevent thermal cycling fatigue, and electronics compartment thermally isolated from the sensor neck. Always verify the manufacturer's stated CIP/SIP cycle rating (typically >1500 CIP and >500 SIP cycles) and request cycle test data if the application exceeds 500 cycles/year.

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Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma

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Product Detail
Range :
0-6kPa ～ 10MPa
Output Pressure :
0~350KPa,10~800KPa
Pressure Type :
Gauge / Absolute / Sealed Gauge
Communication Protocol :
modbus rtu
Stability :
± 0.10% of URL for 12 months
Warranty Period :
12 months
Contact Supplier
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma
Hygienic Pressure Transmitter with Tri-Clamp Connection for Food & Pharma

Xi 'an Qinwei Instrument Factory (General Partnership Enterprise)

Verified Supplier
1 Years
Shaanxi
Business Type :
Manufacturer, Distributor/Wholesaler, Exporter
Main Products :
Radar Level Gauge, Pressure Transmitter, Digital Pressure Transmitter
Total Annual :
5 million-10 million
Employee Number :
500~800
Certification Level :
Verified Supplier
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