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Frequently Asked Questions

Sapphire (monocrystalline Al₂O₃) has exceptional hardness (9 on Mohs scale), outstanding chemical inertness, and excellent elastic properties. Unlike bonded strain gauges or piezoresistive silicon sensors, sapphire diaphragms do not suffer from creep, hysteresis drift, or long-term fatigue. This results in superior long-term stability, wider operating temperature range (-65°C to +150°C), and reliable performance in harsh chemical environments. The all-welded, oil-free construction also eliminates the risk of process contamination from silicone fill fluid.

The HE28 covers an exceptionally wide range from 100 kPa (1 bar) up to 160 MPa (1600 bar) in gauge mode, and up to 40 MPa (400 bar) in absolute mode. With a 4× overload capacity, the sensor can withstand pressure spikes up to four times its rated range without damage, making it suitable for hydraulic systems and high-pressure industrial environments.

Yes. The HE28 is rated for compensated operation from -40°C to +85°C and can survive storage temperatures as low as -65°C. The sapphire diaphragm’s thermal properties ensure reliable measurement even in cryogenic applications such as LNG storage monitoring, liquid nitrogen systems, and cold-chain industrial processes. The oil-free construction means there is no fill fluid that could freeze or become viscous at extreme low temperatures.

The HE28 offers four output options: 4–20 mA (2-wire, code A1) is the most common for industrial process control and long cable runs due to its noise immunity. 1–5 V (code V1) and 0–5 V (code V2) are suitable for data acquisition systems and PLCs with voltage inputs. 0.5–4.5 V (code V3) is designed for embedded OEM applications with 5V supply. Choose 4–20 mA for distances over 15 meters or electrically noisy environments, and voltage output for shorter runs or direct microcontroller interfacing.

The HE28 is designed for over 100 million pressure cycles, far exceeding conventional foil strain gauge sensors (typically rated for 10–50 million cycles). The sapphire diaphragm exhibits virtually zero mechanical fatigue, and the all-welded stainless steel construction provides excellent corrosion resistance. Combined with ≤0.2%/year long-term stability, the HE28 delivers consistent accuracy over many years of continuous operation with minimal recalibration requirements.

Need a High-Pressure Sapphire Sensing Solution?

Our engineering team can help you select the optimal HE28 configuration for your application — whether it’s ultra-high pressure hydraulics, cryogenic monitoring, or corrosive chemical environments. We provide expert guidance on pressure range selection, output signal matching, and custom configurations for volume orders.

Our engineers typically respond within 12 business hours with detailed technical specifications and pricing.

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HE SERIES — SAPPHIRE SENSING TECHNOLOGY

HE28 Sapphire Pressure Sensor

The HE28 series utilizes titanium/silicon-sapphire sensing technology with an all-stainless-steel welded construction, specifically engineered for high-pressure and extreme-temperature applications. It delivers wide pressure coverage from 100 kPa to 160 MPa with exceptional stability, shock resistance, and corrosion protection — ideal for oil & gas, hydraulic systems, and heavy industrial environments.

160 MPa

Max Range

±0.4%

Accuracy (FS)

-65…150°C

Media Temp

IP67

Protection

HE28 Sapphire Pressure Sensor with titanium-sapphire sensing element

Overview

The HE28 sapphire pressure sensor leverages the unique properties of single-crystal sapphire bonded to a titanium/silicon alloy diaphragm. This sensing principle delivers outstanding measurement stability across extreme temperature ranges from -65°C to +150°C, making it one of the most versatile pressure sensors for demanding industrial environments where conventional silicon-based sensors cannot operate reliably.

With pressure coverage spanning from 100 kPa to 160 MPa and 4× overload protection (up to 200 MPa), the HE28 is built for high-pressure applications including oil and gas exploration, hydraulic systems, water-jet cutting equipment, and deep-well monitoring. The all-welded stainless steel construction with no oil-fill ensures safety in critical applications while providing excellent corrosion resistance.

Available in both gauge and absolute pressure configurations, the HE28 achieves a typical accuracy of ±0.4% FS with exceptional long-term stability of ±0.15% FS/year. The sensor’s compact, rugged design withstands 1000g shock and ±20g vibration per IEC standards, certified CE for European compliance.

Specifications

Parameter Specification
Sensing PrincipleTitanium/Silicon–Sapphire
Pressure Range0…100 kPa to 0…160 MPa
Pressure TypeGauge / Absolute
Overload Capacity4× FS (max 200 MPa)
Burst Pressure6× FS (≤200 MPa)
Accuracy (Combined)Typical: ±0.4% FS | Max: ±0.6% FS
Non-linearityTypical: ±0.2% FS | Max: ±0.3% FS
Repeatability + HysteresisTypical: ±0.15% FS | Max: ±0.2% FS
Long-term StabilityTypical: ±0.15% FS/year | Max: ±0.2% FS/year
Response Time≤5 ms
Resolution0.01% FS
Output Signal4–20 mA | 1–5 V | 0–5 V | 0.5–4.5 V | 0.5–4.5 V/5 V
Supply Voltage9–30 V DC (current) | 12–30 V DC (voltage)
Media Temperature-65°C to +150°C
Ambient Temperature-45°C to +100°C
Compensation Range-20°C to +100°C
Zero Temp DriftTypical: ±0.02% FS/°C | Max: ±0.03% FS/°C
Span Temp DriftTypical: ±0.02% FS/°C | Max: ±0.03% FS/°C
Durability>1×10⁸ cycles (10–90% FS)
Vibration Resistance±20g per IEC 60068-2-6
Shock Resistance1000g / 1 ms per IEC 60068-2-27
Process ConnectionM20×1.5 (standard) | Custom available
Electrical ConnectionCable 1 m | Hirschmann DIN 43650A | M12 right-angle 1 m | M12 straight 1 m
Protection RatingIP65 (connector type) / IP67 (cable type) per IEC 60529
Wetted MaterialTitanium/Silicon alloy diaphragm, stainless steel body
Measuring MediumGases or liquids compatible with titanium/silicon
CertificationCE (EU)

Key Features

Sapphire Sensing Technology

Single-crystal sapphire bonded to titanium/silicon diaphragm provides superior temperature stability and chemical resistance, maintaining accuracy across -65°C to +150°C media temperatures.

Ultra-High Pressure Range

Covers 100 kPa to 160 MPa with 4× overload protection up to 200 MPa and 6× burst pressure rating, suitable for the most demanding high-pressure industrial applications.

Extreme Shock & Vibration Resistance

Withstands 1000g/1 ms shock per IEC 60068-2-27 and ±20g vibration per IEC 60068-2-6, ensuring reliable operation in the harshest mechanical environments.

All-Welded, Oil-Free Construction

Fully welded stainless steel body with no oil-fill media ensures safe operation and eliminates risk of diaphragm rupture contaminating process media in critical applications.

Extended Temperature Operation

Media temperature range of -65°C to +150°C with minimal temperature drift (±0.02% FS/°C typical), far exceeding standard piezoresistive sensors limited to -40°C to +125°C.

Ultra-Long Service Life

Sapphire’s inherent hardness and the titanium diaphragm’s fatigue resistance deliver over 100 million pressure cycles (10–90% FS) without degradation.

Applications

Oil & Gas Exploration

Downhole and wellhead pressure monitoring in deep wells, shale gas extraction, and oilfield operations where extreme pressures up to 160 MPa and corrosive media demand sapphire-level durability.

Hydraulic & Water-Jet Systems

High-pressure hydraulic circuits and water-jet cutting equipment requiring reliable measurement up to 1600 bar with resistance to pressure spikes and mechanical vibration.

Marine & Shipbuilding

Engine room, ballast, and propulsion system pressure monitoring aboard vessels where saltwater corrosion, vibration, and wide temperature swings demand sapphire sensor robustness.

Petrochemical & Chemical Processing

Reactor vessels, pipeline pressure monitoring, and chemical process control with aggressive or high-temperature media where the oil-free, all-welded design eliminates contamination risk.

Heavy Machinery & Construction

Pressure sensing in excavators, cranes, and heavy equipment hydraulic systems subject to extreme mechanical shock (1000g) and continuous vibration during operation.

Cryogenic & Low-Temperature

LNG storage, cryogenic processing, and cold-climate industrial installations where media temperatures reach -65°C, beyond the capability of standard pressure sensors.

Ordering Guide

Use the model code structure below to configure your HE28 Sapphire Pressure Sensor. Select options from each column to build your complete part number.

Model Code Format: HE28 [Pressure Type] [Range] [Output] [Process Connection] [Electrical Connection] [Special]

Example: HE28 G 025B A1 F1 W2 T → HE28 Gauge, 0–25 bar, 4–20 mA, M20×1.5, Hirschmann DIN 43650A, Standard

Parameter Code Description
Pressure TypeGGauge Pressure
AAbsolute Pressure
Pressure Range001B0–1 bar (0–100 kPa)
002B0–2 bar (0–200 kPa)
004B0–4 bar (0–400 kPa)
010B0–10 bar (0–1 MPa)
016B0–16 bar (0–1.6 MPa)
025B0–25 bar (0–2.5 MPa)
035B0–35 bar (0–3.5 MPa)
040B0–40 bar (0–4 MPa)
060B0–60 bar (0–6 MPa)
100B0–100 bar (0–10 MPa)
250B0–250 bar (0–25 MPa)
400B0–400 bar (0–40 MPa)
600B0–600 bar (0–60 MPa) — Gauge only
01kB0–1000 bar (0–100 MPa) — Gauge only
1k6B0–1600 bar (0–160 MPa) — Gauge only
Output SignalA14–20 mA (2-wire)
V11–5 V (3-wire)
V20–5 V (3-wire)
V30.5–4.5 V (3-wire)
Process ConnectionF1M20×1.5 external thread
Electrical ConnectionW1Cable outlet, 1 m length
W2Hirschmann DIN 43650A connector
W3M12 right-angle connector, 1 m cable
W4M12 straight connector, 1 m cable
SpecialTSpecial requirements (contact sales for custom configurations)

Need a High-Pressure Sapphire Sensing Solution?

Our engineering team can help you select the optimal HE28 configuration for your application — whether it’s ultra-high pressure hydraulics, cryogenic monitoring, or corrosive chemical environments. We provide expert guidance on pressure range selection, output signal matching, and custom configurations for volume orders.

Our engineers typically respond within 12 business hours with detailed technical specifications and pricing.