HE SERIES — CERAMIC CAPACITIVE TECHNOLOGY
HE26 Ceramic Capacitive Pressure Sensor
The HE26 series utilizes advanced variable capacitance technology with a high-purity alumina ceramic diaphragm, delivering exceptional corrosion resistance, shock tolerance, and long-term stability. With overload protection up to 20x full scale on low ranges, it is the ideal upgrade from piezoresistive sensors for demanding industrial applications from 10 kPa to 4 MPa.
4 MPa
Max Range
±0.4%
Accuracy (FS)
20x
Overload
IP67
Protection
Product Overview
The HE26 Ceramic Capacitive Pressure Sensor/Transmitter is part of the HE series, engineered as a modular, OEM-standard industrial measurement instrument by HMK. It employs variable capacitance technology with a high-purity alumina (Al₂O₃) ceramic substrate, where process pressure acts directly on the ceramic diaphragm. The capacitance between the base electrode and diaphragm electrode changes proportionally with applied pressure, eliminating the need for oil-fill transfer fluids found in traditional piezoresistive sensors.
A key advantage of the ceramic capacitive design is its inherent overload protection. When overpressured, the diaphragm contacts the ceramic base without damage — once pressure returns to normal, performance remains unaffected. This provides overload capability up to 20x full scale on low ranges (3x on higher ranges), making the HE26 an ideal upgrade from diffused silicon and ceramic piezoresistive sensors that suffer from limited overload tolerance.
The ceramic diaphragm offers excellent chemical compatibility with most liquids, gases, and steam (compatible with Al₂O₃ and 1Cr18Ni9Ti media), combined with high thermal stability across -40 to 125°C media temperature. With typical accuracy of ±0.4% FS, resolution of 0.01% FS, and long-term stability of ±0.15% FS/year, the HE26 delivers reliable measurements across pressure ranges from 10 kPa to 4 MPa with multiple output options including 4-20mA, 0-5V, and 0.5-4.5V.
Technical Specifications
| Parameter | Specification |
|---|---|
| Measuring Range | 0~10 kPa … 4 MPa |
| Pressure Type | Gauge / Absolute |
| Overload Capacity | 3x~20x rated pressure (higher ratio on lower ranges) |
| Overall Accuracy | Typical: ±0.4% FS; Max: ±0.6% FS |
| Non-Linearity | Typical: ±0.2% FS; Max: ±0.3% FS |
| Repeatability + Hysteresis | Typical: ±0.15% FS; Max: ±0.2% FS |
| Long-Term Stability | Typical: ±0.15% FS/year; Max: ±0.2% FS/year |
| Zero Temperature Drift | Typical: ±0.015% FS/°C; Max: ±0.02% FS/°C |
| Sensitivity Temp. Drift | Typical: ±0.015% FS/°C; Max: ±0.02% FS/°C |
| Resolution | 0.01% FS |
| Response Time | ≤5 ms |
| Durability | >1×10⁸ cycles (P: 10~90% FS) |
| Output Signal | 4-20mA / 1-5V / 0-5V / 0.5-4.5V |
| Power Supply | 9-30V DC (current output) / 12-30V DC (voltage output) |
| Media Temperature | -40°C ~ +125°C |
| Ambient Temperature | -40°C ~ +85°C |
| Compensated Temperature | -40°C ~ +100°C |
| Measuring Media | Corrosive liquids, gases, and steam (compatible with Al₂O₃ and 1Cr18Ni9Ti) |
| Vibration Resistance | 10g, IEC 60068-2-6 |
| Shock Resistance | 100g/10ms, IEC 60068-2-27 |
| Process Connection | M20×1.5 / G1/4 / 1/4NPT / Custom |
| Electrical Connection | Cable (1m) / Hirschmann DIN 43650A / M12 connector |
| Protection Grade | IP65 (connector type) / IP67 (cable type), IEC 60529 |
| Certifications | CE (EU) |
Key Features
Exceptional Overload Protection
Up to 20x full-scale overload on low ranges — the ceramic diaphragm contacts the base without damage, recovering full performance once pressure normalizes. Eliminates burst-risk common in piezoresistive sensors.
Superior Corrosion Resistance
High-purity alumina ceramic diaphragm is chemically inert — compatible with most corrosive liquids, gases, and steam. No oil-fill means no risk of media contamination or seal failure.
Wide Temperature Range
Operates reliably from -40°C to +125°C media temperature with ±0.015% FS/°C temperature drift. Compensated across -40 to 100°C for consistent accuracy in extreme environments.
Ultra-Long Service Life
Rated for over 100 million pressure cycles at 10-90% FS. The all-ceramic sensing element has no moving seals or oil-fill to degrade, delivering maintenance-free operation year after year.
Flexible Output Options
Choose from 4-20mA (2-wire), 1-5V, 0-5V, or 0.5-4.5V outputs to match your existing control infrastructure. Standard 9-30V DC supply for current output and 12-30V DC for voltage.
Industrial-Grade Robustness
Withstands 10g vibration (IEC 60068-2-6) and 100g/10ms shock (IEC 60068-2-27). IP67 cable-type protection enables reliable operation in harsh industrial environments.
Applications
Industrial Process Control
Monitor and regulate pressure in manufacturing pipelines, reactors, and automated process lines. The ceramic sensor’s corrosion resistance and 10 kPa–4 MPa range handle diverse process media without degradation.
Automotive Testing
Precision pressure monitoring in automotive test benches — engine oil, coolant, and brake system testing. The 5 ms response time and 100 million cycle life ensure reliable data collection across extended test campaigns.
Food & Pharmaceutical
The oil-free ceramic diaphragm eliminates media contamination risk in sanitary applications. Compatible with CIP cleaning agents and food-grade media, meeting strict hygiene requirements in processing environments.
Medical Equipment
Low-range pressure monitoring (10 kPa+) in medical devices and diagnostic equipment. The high overload tolerance protects the sensor during sterilization or accidental pressure spikes in sensitive medical systems.
Hydraulic & Pneumatic Systems
Withstands pressure spikes and surges in hydraulic circuits and pneumatic lines. The 20x overload capacity on low ranges provides a critical safety margin that piezoresistive sensors cannot match.
HVAC & Building Automation
Low-range pressure sensing for air handling systems, clean room monitoring, and building management. The 0.5-4.5V ratiometric output integrates directly with common BMS controllers.
Ordering Guide
Use the model code system below to specify your HE26 configuration. Example: HE26 G 001B A1 F2 W2 — HE26, Gauge pressure, 0-1 bar, 4-20mA output, G1/4 thread, Hirschmann connector.
| Selection Code | Options |
|---|---|
| Model | HE26 |
| Pressure Type | G = Gauge | A = Absolute |
| Range | 010K = 10 kPa (G) | 020K = 20 kPa (G) | 040K = 40 kPa (G) | 001B = 1 bar (G/A) | 002B = 2 bar (G/A) | 004B = 4 bar (G/A) | 010B = 10 bar (G/A) | 020B = 20 bar (G) | 040B = 40 bar (G) |
| Output | A1 = 4-20mA | V1 = 1-5V | V2 = 0-5V | V3 = 0.5-4.5V |
| Process Connection | F1 = M20×1.5 | F2 = G1/4 | F3 = 1/4NPT | F0 = Custom |
| Electrical Connection | W1 = Cable 1m | W2 = Hirschmann DIN 43650A | W3 = M12 right-angle 1m | W4 = M12 straight 1m |
| Special | T = Special requirements (specify in order notes) |
Note: Custom configurations are available for volume orders. Contact our sales engineering team at for details.
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Frequently Asked Questions
Need a Ceramic Capacitive Pressure Solution?
Whether you need corrosion-resistant sensing for aggressive media, high overload protection for low-range applications, or a reliable OEM sensor module — our engineering team can help you select and configure the right HE26 variant for your specific requirements.
Our engineers typically respond within 12 business hours with detailed technical specifications and pricing.