HE Series — Miniature Pressure Sensors
HE91 Miniature Pressure Transmitter
Ultra-compact pressure transmitter weighing under 20 g, designed for space-constrained installations. Piezoresistive silicon strain gauge technology delivers ±0.5% FS accuracy across 100 kPa to 70 MPa, with optional flush diaphragm achieving 3 kHz dynamic response for demanding test and OEM applications.
Range: 100 kPa–70 MPa
Weight: <20 g
Accuracy: ±0.5% FS
CE Certified
Product Overview
The HE91 Miniature Pressure Transmitter is an ultra-compact, integrated pressure sensor designed for applications where installation space is severely limited or sensor weight must be minimized. Weighing less than 20 grams (without cable), it delivers full transmitter-grade performance in a package small enough for embedded OEM systems, robotic end-effectors, and portable test equipment.
The sensing element uses a temperature-compensated Wheatstone bridge diffused onto a high-stability micro-machined silicon strain gauge substrate, ensuring excellent accuracy and repeatability. The compact body can be optionally constructed entirely from titanium alloy for corrosion resistance in harsh environments while maintaining minimal weight.
Available with an optional G3/8 flush diaphragm design, the HE91 achieves up to 3 kHz dynamic frequency response — making it suitable for both static process monitoring and dynamic pressure testing. Standard threaded configurations (M5×0.8, M6×1, M8×1) deliver 1 kHz response bandwidth. With pressure ranges from 100 kPa to 70 MPa in both gauge and absolute reference types, the HE91 serves as a versatile platform for demanding miniature pressure measurement across aerospace, automotive, biomedical, and defense applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Pressure Range | 100 kPa – 70 MPa (1 bar – 700 bar) |
| Reference Type | Gauge / Absolute |
| Sensing Technology | Piezoresistive silicon strain gauge (micro-machined) |
| Accuracy (Combined) | ±0.5% FS (default), ±0.25% FS (option T1), ±0.1% FS (option T2) |
| Long-Term Stability | Typical ±0.1% FS/year, Max ±0.2% FS/year |
| Resolution | 0.01% FS |
| Natural Frequency | 500 kHz |
| Response Frequency | 0–1 kHz (threaded), 0–3 kHz (flush diaphragm G3/8) |
| Overload Capacity | 1.5–2× rated pressure |
| Burst Pressure | 4× FS (≤100 MPa) |
| Cycle Durability | >10⁷ cycles |
| Output Signals | 4-20 mA, 1-5 V, 0-5 V, 0.5-4.5 V |
| Supply Voltage | 9–30 VDC (current) / 12–36 VDC (voltage) |
| Media Temperature | -40°C to +100°C (special: -55°C to +150°C) |
| Ambient Temperature | -40°C to +85°C |
| Compensation Range | -20°C to +70°C (special: -40°C to +120°C) |
| Zero Temp Drift | Typical ±0.01% FS/°C, Max ±0.02% FS/°C |
| Sensitivity Temp Drift | Typical ±0.01% FS/°C, Max ±0.02% FS/°C |
| Vibration Resistance | 20 g (IEC 60068-2-6) |
| Shock Resistance | 500 g / 1 ms (IEC 60068-2-27) |
| Weight | <20 g (without cable) |
| Housing Material | Stainless steel 316L (standard) / Titanium alloy (option T3) |
| Process Connection | M5×0.8, M6×1, M8×1, G3/8 flush diaphragm, custom |
| Electrical Connection | Direct cable (1 m), M8 right-angle (1 m), XS9 aviation connector (1 m) |
| Protection Rating | IP65 (connector) / IP67 (cable/integrated) |
| EMC | EN 61000-6-3 (emission), EN 61000-6-2 (immunity) |
| Certifications | CE |
Key Features
Ultra-Compact <20 g Design
One of the lightest integrated pressure transmitters available, weighing under 20 grams without cable. Ideal for space-constrained OEM installations, robotics, and portable instruments.
Up to 3 kHz Dynamic Response
Optional G3/8 flush diaphragm design achieves 3 kHz frequency response for dynamic pressure testing, while standard threaded ports deliver 1 kHz bandwidth for process monitoring.
Optional All-Titanium Housing
Full titanium alloy housing option (T3) provides exceptional corrosion resistance and weight reduction for aerospace, marine, and chemically aggressive environments.
High Accuracy Options
Standard ±0.5% FS accuracy with optional upgrades to ±0.25% FS (T1) or ±0.1% FS (T2), meeting stringent requirements for precision measurement and calibration applications.
500 g Shock Resistance
Military-grade shock resistance rated at 500 g / 1 ms per IEC 60068-2-27, plus 20 g vibration resistance, ensuring reliable operation in high-shock mobile and defense environments.
Wide Range 100 kPa–70 MPa
Covers pressure measurement from 1 bar to 700 bar in both gauge and absolute reference types, with modular design allowing rapid configuration for diverse application requirements.
Applications
Automotive Testing & Safety
Measure pressure in airbag deployment systems, brake circuits, engine intake manifolds, and turbocharger boost — where compact size and fast dynamic response are critical.
Aerospace & Defense
Ultra-lightweight pressure sensing for aircraft hydraulic systems, missile guidance, satellite propulsion monitoring, and military vehicle systems where every gram counts.
Robotics & Micro-Devices
Embedded pressure feedback for robotic grippers, micro-reactors, micro-fluidic systems, and precision assembly equipment requiring miniature form factor with high reliability.
Biomedical & Lab Analysis
Pressure monitoring in biomedical liquid analyzers, infusion pumps, dialysis machines, and laboratory instruments where sensor size directly impacts device portability and design.
Marine & Underwater Systems
Compact pressure sensing for underwater ROVs, oceanographic instruments, dive equipment, and ship ballast monitoring — with optional titanium housing for saltwater corrosion resistance.
Laboratory & R&D Testing
Precision pressure measurement for research test setups, wind tunnel experiments, small-scale process development, and prototype validation where standard sensors are too bulky.
Ordering Guide
Use the model code structure below to specify your HE91 configuration. For custom requirements or assistance, contact our engineering team.
Model Code: HE91 – [Reference] – [Range] – [Output] – [Thread] – [Electrical] – [Options]
| Position | Code | Description |
|---|---|---|
| Reference Type | G | Gauge pressure |
| A | Absolute pressure | |
| Pressure Range | 001B…700B | 1 bar to 700 bar (specify full-scale, e.g., 016B = 16 bar) |
| Output Signal | A1 | 4-20 mA (2-wire) |
| V1 | 1-5 V (3-wire) | |
| V2 | 0-5 V (3-wire) | |
| V3 | 0.5-4.5 V (3-wire) | |
| V4 | 0.5-4.5 V / 5 V ratiometric | |
| Process Connection | F1 | M6×1 external thread |
| F2 | M8×1 external thread | |
| F3 | M5×0.8 external thread | |
| F4 | G3/8 flush diaphragm | |
| F0 | Custom (specify) | |
| Electrical Connection | W1 | Direct cable outlet (1 m) |
| W3 | M8 right-angle connector (1 m) | |
| W4 | XS9 aviation connector (1 m) | |
| Options | T1 | Enhanced accuracy ±0.25% FS |
| T2 | High accuracy ±0.1% FS | |
| T3 | All-titanium housing | |
| T | Special requirements (specify) |
Example: HE91-G-016B-A1-F1-W4-T1 = Gauge type, 16 bar range, 4-20 mA output, M6×1 thread, XS9 aviation connector, ±0.25% FS accuracy
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Frequently Asked Questions
The HE91 weighs less than 20 grams without cable — roughly 5 to 10 times lighter than a standard industrial pressure transmitter, which typically weighs 100–200 grams. Its smallest thread option (M5×0.8) makes it one of the most compact integrated pressure transmitters available, suitable for applications where standard sensors simply cannot fit.
The G3/8 flush diaphragm eliminates the dead volume (cavity) found in standard threaded pressure ports. This provides two key benefits: first, it triples the dynamic frequency response from 1 kHz to 3 kHz, enabling faster pressure transient capture; second, it prevents media from becoming trapped in a cavity, which is important for hygienic applications and viscous fluids that could clog a traditional pressure port.
Yes. Despite its miniature size, the HE91 is built to military-grade shock and vibration standards. It withstands 500 g mechanical shock (1 ms pulse, per IEC 60068-2-27) and 20 g continuous vibration (per IEC 60068-2-6). These ratings make it suitable for automotive crash testing, aerospace flight systems, and defense applications where extreme mechanical stress is expected.
The T3 all-titanium housing option replaces the standard stainless steel body with titanium alloy, which offers superior corrosion resistance (especially in saltwater, acidic, and chloride environments) while being approximately 40% lighter than steel. This makes it ideal for marine, aerospace, and chemical processing applications where both weight reduction and corrosion resistance are priorities.
The HE91 offers three accuracy tiers: standard ±0.5% FS (included), enhanced ±0.25% FS (option T1), and high-precision ±0.1% FS (option T2). All accuracy specifications include combined linearity, hysteresis, and repeatability errors. The temperature compensation range is -20°C to +70°C standard, expandable to -40°C to +120°C for extreme environments.
Need a Miniature Pressure Sensor for Your Application?
Our engineering team can help you select the optimal HE91 configuration for your space-constrained application — including thread size, accuracy grade, housing material, and output signal. Whether you need a single prototype or volume OEM quantities, we provide full technical support.
Our engineers typically respond within 12 business hours with detailed technical specifications and pricing.