HM SERIES — SANITARY PRESSURE TECHNOLOGY
HM70 Sanitary Flat Membrane Pressure Transmitter
Designed for hygienic and sanitary pressure measurement in food, beverage, and pharmaceutical processes. Featuring a flush-mount 316L stainless steel diaphragm, the HM70 eliminates dead zones and ensures CIP/SIP compatibility with ±0.25% FS accuracy and IP67 protection.
Product Overview
The HM70 Sanitary Flat Membrane Pressure Transmitter is specifically engineered for hygienic pressure measurement in food processing, beverage production, pharmaceutical manufacturing, and other sanitary applications. Its flush-mount diaphragm design completely eliminates dead zones where bacteria could accumulate, making it fully compatible with Clean-in-Place (CIP) and Steam-in-Place (SIP) procedures.
Built with imported high-precision, high-stability pressure sensor components, the HM70 converts gauge or absolute pressure into standard 4–20 mA, 0–5 V, or 1–5 V electrical signals through a highly reliable amplification circuit with precision temperature compensation. The all-stainless-steel construction with fully sealed welding ensures long-term reliability even in aggressive washdown environments.
With an overall accuracy of ±0.25% FS (typical), long-term stability of ±0.1% FS/year, and a measuring range spanning from -100 kPa vacuum up to 35 MPa, the HM70 covers virtually all sanitary pressure measurement scenarios. The transmitter features M30×1.5 threaded or tri-clamp process connections, intrinsic safety certification (Ex ia II CT5), and IP67 cable-type protection — ensuring reliable operation in demanding hygienic production environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Measuring Medium | All liquids, gases, or steam compatible with 316L stainless steel |
| Measuring Range | -100 kPa ~ 0 ~ 20 kPa … 35 MPa |
| Pressure Type | Gauge or Absolute |
| Overall Accuracy | Typical: ±0.25% FS; Max: ±0.4% FS |
| Long-Term Stability | Typical: ±0.1% FS/year; Max: ±0.2% FS/year |
| Overload Capacity | 1.5× Full Scale |
| Zero Temperature Drift | Typical: ±0.02% FS/°C; Max: ±0.03% FS/°C |
| Sensitivity Temperature Drift | Typical: ±0.02% FS/°C; Max: ±0.03% FS/°C |
| Thermal Hysteresis | ±0.1% (typical) |
| Output Signal | 4–20 mA / 1–5 V DC / 0–5 V DC / 0.5–4.5 V DC |
| Power Supply | 12–36 V DC (typically 24 V DC) |
| Load Resistance | ≤ (U-12) / 0.02 Ω |
| Medium Temperature | -20 ~ 85°C |
| Compensated Temperature | -10 ~ 50°C |
| Operating Temperature | -20 ~ 80°C |
| Response Time | ≤ 2 ms |
| Process Connection | M30×1.5 external thread or Tri-Clamp |
| Wetted Material | 316L Stainless Steel (flush diaphragm) |
| Protection Grade | Connector type: IP65; Cable type: IP67 |
| Safety Certification | Ex ia II CT5 (Intrinsic Safety) |
| Insulation Resistance | 100 MΩ @ 500 V DC |
| Weight | Approx. 0.5 kg |
💡 Custom ranges, output signals, and process connections are available upon request. Contact our engineers for tailored solutions.
Key Features
Flush-Mount Sanitary Diaphragm
316L stainless steel flat diaphragm with no dead zones or crevices. Fully compatible with CIP and SIP cleaning procedures, preventing bacterial buildup in sanitary pipelines.
High Accuracy & Stability
±0.25% FS typical accuracy with ±0.1% FS/year long-term stability. Precision temperature compensation ensures reliable readings across -10 to 50°C compensated range.
Versatile Output Options
Supports 4–20 mA, 1–5 V, 0–5 V, and 0.5–4.5 V output signals. Zero and span are field-adjustable, adapting to diverse control system requirements.
Intrinsic Safety Certified
Optional Ex ia II CT5 intrinsic safety certification for deployment in hazardous areas. Suitable for food plants, breweries, and pharmaceutical facilities with explosion-risk zones.
All Stainless Steel Construction
Full 316L stainless steel wetted parts and housing with sealed welding construction. Resists aggressive washdown chemicals, steam, and corrosive cleaning agents.
EMI & Surge Protection
Built-in lightning strike protection and RF interference shielding. Reverse polarity protection and transient over-voltage/over-current protection ensure reliable operation in industrial environments.
Applications
Food & Beverage Processing
Monitor pressure in dairy lines, juice production, brewing tanks, and bottling systems. The flush diaphragm ensures no product contamination or bacterial accumulation during CIP cycles.
Pharmaceutical Manufacturing
Pressure monitoring in sterile reactor vessels, fermentation tanks, and purified water systems. Ex ia certification enables safe deployment in pharmaceutical explosion-risk zones.
Sanitary Pipeline Systems
Inline pressure measurement for hygienic piping, tri-clamp connections, and clean steam lines. The 316L diaphragm withstands repeated SIP sterilization at elevated temperatures.
Wastewater & Sewage Treatment
Reliable pressure sensing for sludge lines, viscous media, and aggressive wastewater streams. The flat membrane prevents clogging from high-viscosity or particulate-laden fluids.
Cosmetics & Personal Care
Pressure control in lotion, cream, and gel production lines. The sanitary design meets GMP requirements and the flush surface prevents cross-contamination between product batches.
Viscous Media Measurement
Ideal for measuring pressure in chocolate, honey, adhesives, paints, and other high-viscosity fluids. The flat membrane eliminates dead legs where viscous materials would otherwise accumulate.
Electrical Wiring & Process Connections
Electrical Connection Options
| Code | Connection Type | Protection |
|---|---|---|
| W1 | Cable type (2 m lead wire) | IP67 |
| W2 | DIN 43650 connector (Hirschmann) | IP65 |
Process Connection Options
| Code | Connection Type | Description |
|---|---|---|
| F1 | M30×1.5 External Thread | Standard sanitary thread connection |
| F2 | Tri-Clamp | Quick-release sanitary clamp fitting |
| F0 | Special | Custom connection per customer requirement |
Ordering Guide
Use the model code below to configure your HM70 transmitter. Example: HM70 (0~100KPa) — 1 — A1 — F1 — W2 represents a sanitary flat membrane pressure transmitter, 0–100 kPa gauge range, ±0.4% FS accuracy, 4–20 mA output, M30×1.5 thread, DIN 43650 connector.
| Selection Code | Options |
|---|---|
| Model | HM70 — Sanitary Flat Membrane Pressure Transmitter |
| Pressure Type | G = Gauge (default, can be omitted); A = Absolute |
| Range | Specify measuring range (e.g., 0~100 kPa, 0~1 MPa, 0~35 MPa) |
| Accuracy | 1 = ±0.4% FS | 2 = ±0.25% FS | 3 = ±0.1% FS |
| Output Signal | A1 = 4–20 mA | V1 = 1–5 V DC | V2 = 0–5 V DC | V3 = 0.5–4.5 V DC |
| Process Connection | F1 = M30×1.5 thread | F2 = Tri-Clamp | F0 = Special |
| Electrical Connection | W1 = Cable type (IP67, 2 m) | W2 = DIN 43650 connector (IP65) |
| Additional Options | E = Intrinsic Safety (Ex ia II CT5) — requires safety barrier power supply |
Note: 1) The measured medium must be compatible with 316L stainless steel wetted parts. 2) Selecting option “E” (intrinsic safety) requires connection through a certified safety barrier. 3) For special requirements, please contact our engineering team.
Frequently Asked Questions
Need a Sanitary Pressure Solution?
Tell us about your hygienic process requirements — fluid type, temperature, pressure range, and connection preferences. Our engineers typically respond within 12 business hours with a customized recommendation.