HE SERIES — DIGITAL COMMUNICATION TECHNOLOGY

HE29 RS485/CAN Digital Pressure Sensor

The HE29 digital pressure sensor features RS485 Modbus RTU and CAN bus communication protocols, enabling direct digital readout and multi-node networking. Designed with ultra-low power consumption (≤2 mA standby) and wide supply voltage (3.3–36 V), it is ideal for distributed pressure monitoring networks, industrial IoT, and remote data acquisition systems.

100 MPa

Max Range

±0.5%

Accuracy (FS)

RS485

Modbus RTU

IP67

Protection

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HE29 RS485 CAN Digital Pressure Sensor

Overview

The HE29 RS485/CAN digital pressure sensor represents a new generation of smart pressure instrumentation that replaces traditional analog signals with direct digital communication. Using standard Modbus RTU protocol over RS485 or CAN bus (CANopen / J1939 / custom), multiple sensors can be networked on a single twisted-pair bus for centralized monitoring — eliminating the need for individual signal conditioning channels.

The sensor features ultra-low power consumption of ≤2 mA in standby mode with a wide supply voltage range (3.3–16 V or 12–36 V), making it compatible with battery, solar, or standard 24 VDC industrial power. With 0.01% FS digital resolution and 8–10 samples per second, it delivers precise real-time pressure data suitable for SCADA systems, PLCs, and embedded controllers.

Built with a piezoresistive silicon sensing element and all-stainless-steel isolation diaphragm, the HE29 covers pressure ranges from 10 kPa to 100 MPa. It features user-configurable communication address and baud rate, remote zero calibration capability, and full EMC compliance (EN61000-4-2/3/4/5) for reliable operation in electrically noisy industrial environments.

Specifications

Parameter Specification
Pressure Range10 kPa … 100 MPa (gauge); 1–40 bar (absolute)
Pressure TypeGauge / Absolute
Overload Capacity1.5–2× rated range
Burst Pressure4× rated range
Output SignalRS485 Modbus RTU / CAN (CANopen, J1939, custom)
Digital Resolution0.01% FS
Sampling Rate8–10 samples/second
Default Baud Rate9600 bps (configurable: 2400, 4800, 19200, 38400)
Default Address01 (user-configurable)
Response Time≤50 ms
Accuracy (typ.)±0.5% FS
Accuracy (max.)±1.0% FS
Long-Term Stability±0.2% FS/year (typ.), ±0.3% FS/year (max.)
Zero Temp. Drift±0.02% FS/°C (typ.), ±0.05% FS/°C (max.)
Span Temp. Drift±0.02% FS/°C (typ.), ±0.05% FS/°C (max.)
Media Temperature-20°C to +85°C
Ambient Temperature-20°C to +80°C
Compensated Range-10°C to +60°C
Supply Voltage3.3–16 V DC or 12–36 V DC (typ. 24 V)
Power Consumption≤2 mA (standby, no communication)
Durability>10 million cycles (10–90% FS)
Media CompatibilityGases and liquids compatible with 316 stainless steel
Vibration Resistance10g per IEC 60068-2-6
Shock Resistance500g / 1 ms per IEC 60068-2-27
EMC ComplianceEN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4-5
Insulation Resistance>100 MΩ @ 100 V
Ingress ProtectionIP65 (connector) / IP67 (cable) per IEC 60529
CertificationCE (EU)

Key Features

RS485 Modbus RTU Communication

Standard Modbus RTU protocol over RS485 half-duplex bus enables direct digital pressure readout. Configurable baud rate (2400–38400 bps) and device address allow flexible multi-node networking with up to 247 devices on a single bus.

CAN Bus Support

Optional CAN bus interface supports CANopen, SAE J1939, and custom protocols for automotive, agricultural, and heavy machinery applications requiring robust, high-speed field bus communication.

Ultra-Low Power Design

Standby current of ≤2 mA enables operation from batteries or solar panels. Dual supply ranges (3.3–16 V and 12–36 V) accommodate both low-power IoT deployments and standard industrial 24 VDC systems.

Full EMC Compliance

Tested and certified to EN61000-4-2 (ESD), EN61000-4-3 (RF), EN61000-4-4 (burst), and EN61000-4-5 (surge) for reliable operation in electrically noisy industrial environments near motors, inverters, and switchgear.

Remote Zero Calibration

Built-in remote zero point calibration and fine-tuning function accessible via the digital bus, reducing maintenance time and enabling periodic recalibration without physical access to the sensor.

High Digital Resolution

0.01% FS resolution with 8–10 samples per second delivers smooth, noise-free pressure data directly in engineering units — eliminating external ADC modules and analog signal conditioning circuitry.

Applications

Smart City Water Networks

Municipal water distribution monitoring with RS485 networked sensors enables real-time leak detection, pressure zone management, and SCADA integration across thousands of measurement points.

Oil & Gas Pipeline Monitoring

Remote pipeline pressure monitoring using low-power RS485 sensors with solar or battery power, providing continuous digital data to central control rooms via RTU/gateway systems.

Building Automation & HVAC

Constant-pressure water supply, chiller systems, and HVAC monitoring with multi-sensor bus networking for intelligent building management systems (BMS).

Hydraulic & Pneumatic Control

Digital pressure feedback in hydraulic presses, injection molding machines, and pneumatic actuator systems where direct PLC communication eliminates analog signal noise.

Power Plant Monitoring

Distributed pressure monitoring across turbine systems, boiler feed water, and cooling circuits with networked digital sensors replacing individual analog transmitter loops.

Special Vehicles & Robotics

On-board pressure monitoring for industrial robots, test benches, special-purpose vehicles, and remote-controlled equipment requiring compact digital sensors with CAN bus integration.

Ordering Guide

Use the model code structure below to configure your HE29 Digital Pressure Sensor. Select options from each column to build your complete part number.

Model Code: HE29 [Pressure Type] [Range] [Output] [Supply] [Process Connection] [Electrical Connection]

Example: HE29 G 010B S1 D1 F2 W3 → HE29 Gauge, 0–10 bar, RS485 Modbus RTU, 12–36V DC, G1/4 external, M12 right-angle 1m

Parameter Code Description
Pressure TypeGGauge Pressure
AAbsolute Pressure
Range010K0–10 kPa (Gauge only)
020K0–20 kPa (Gauge only)
035K0–35 kPa (Gauge only)
070K0–70 kPa (Gauge only)
001B0–1 bar
002B0–2 bar
004B0–4 bar
006B0–6 bar
010B0–10 bar
016B0–16 bar
025B0–25 bar
040B0–40 bar
060B0–60 bar (Gauge only)
100B0–100 bar (Gauge only)
160B0–160 bar (Gauge only)
250B0–250 bar (Gauge only)
400B0–400 bar (Gauge only)
600B0–600 bar (Gauge only)
01KB0–1000 bar (Gauge only)
OutputS1RS485 Modbus RTU
C1CAN (custom protocol)
C2CANopen
SupplyD112–36 V DC (industrial)
D23.3–16 V DC (low-power)
Process ConnectionF1M20×1.5 external thread
F2G1/4 external thread
F31/4 NPT external thread
F0Custom (contact sales)
ElectricalW1Cable outlet, 1 m length
W2Hirschmann DIN 43650A connector
W3M12 right-angle connector, 1 m cable
W4M12 straight connector, 1 m cable

Frequently Asked Questions

The RS485 Modbus RTU protocol supports up to 247 unique device addresses on a single bus. Each HE29 sensor ships with a default address of 01, which can be changed via Modbus commands to any address from 01 to 247. Using standard twisted-pair cable with proper termination, bus lengths up to 1200 meters are achievable at lower baud rates.

Yes. The HE29 offers a low-voltage supply option (D2: 3.3–16 V DC) with standby current of ≤2 mA, making it highly suitable for battery or solar-powered installations. In remote pipeline monitoring or field-deployed IoT sensor networks, the ultra-low power consumption significantly extends battery life compared to traditional 4–20 mA loop-powered transmitters.

RS485 (code S1) uses Modbus RTU protocol in a master-slave architecture, ideal for SCADA systems and PLCs. CAN bus (codes C1/C2) uses a peer-to-peer message-based protocol common in automotive, agricultural machinery, and mobile hydraulics. Choose CAN for vehicle/machinery applications with existing CAN networks (J1939, CANopen), and RS485 for building automation, process control, and long-distance monitoring networks.

Both device address and baud rate are user-configurable via standard Modbus write commands. The sensor ships with address 01 and baud rate 9600 bps. Available baud rates include 2400, 4800, 9600, 19200, and 38400 bps. Configuration changes are stored in non-volatile memory and persist through power cycles. A detailed Modbus register map is provided in the product datasheet.

Yes. The HE29 supports remote zero point calibration and fine-tuning commands sent via the RS485 or CAN bus. This allows periodic recalibration of installed sensors without physically accessing them — particularly valuable for sensors installed in difficult-to-reach locations such as underground pipelines, elevated water towers, or inside sealed equipment enclosures.