HM200 SERIES — WIRELESS DIFFERENTIAL PRESSURE MONITORING

HM200D Wireless Differential Pressure Transmitter

The HM200D is a wireless differential pressure transmitter featuring LoRa long-range communication, battery-powered operation, and cloud-based monitoring. Designed for remote differential pressure measurement in HVAC systems, filter monitoring, flow measurement, and industrial process applications where wired connections are impractical or cost-prohibitive.

3 MPa

Max DP Range

±0.1% FS

Best Accuracy

LoRa

Wireless

3+ Years

Battery Life

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HM200D Wireless Differential Pressure Transmitter

Wireless Differential Pressure Monitoring for HVAC & Process

The HM200D is a wireless differential pressure transmitter built on the HM200 series modular platform. It combines a high-precision single crystal silicon differential pressure sensor with LoRa long-range wireless communication and cloud-based monitoring — enabling remote differential pressure measurement without signal cables or power lines.

Differential pressure measurement is critical for monitoring filter conditions, measuring flow rates through orifice plates and Venturi tubes, controlling cleanroom pressurization, and tracking boiler draft conditions. The HM200D brings these capabilities to distributed monitoring scenarios where wired DP transmitters are impractical due to distance or installation constraints.

With configurable measuring ranges from 0–100 kPa to 0–3 MPa, the HM200D covers a wide range of DP applications. The single crystal silicon sensing element delivers ±0.1% FS accuracy with exceptional long-term stability (≤0.1% FS/year), while the built-in lithium battery supports 3+ years of autonomous operation.

Technical Specifications

Parameter	HM200D Specification
Measuring Range	0–100 kPa to 0–3 MPa differential pressure (customizable)
Overload Capacity	3× to 10× rated DP depending on range
Overall Accuracy	±0.5% FS / ±0.25% FS standard; ±0.1% FS (single crystal silicon)
Long-Term Stability	≤0.1% FS/year
Sensing Technology	Single crystal silicon differential pressure sensor
Operating Temperature	−20°C to +85°C
Compensated Temperature	−10°C to +60°C
Wireless Protocol	LoRa (433 MHz / 470 MHz / 868 MHz / 915 MHz selectable)
Transmission Distance	Up to 5 km (open area); extendable via gateway relay
Power Supply	Built-in 3.6V lithium battery
Battery Life	3–5 years (dependent on reporting interval)
Reporting Interval	Configurable: 1 min to 24 hours
Wetted Material	316L stainless steel
Process Connection	M20×1.5 (standard), flanged (optional)
Protection Grade	IP65 / IP67
Display	Optional LCD
Explosion Proof	Optional Ex ia IIC T6
Cloud Platform	PC web + mobile APP (iOS/Android) + WeChat mini-program
Measurement Types	Gauge, absolute, differential pressure

Key Features

Single Crystal Silicon DP Sensor

High-precision differential pressure sensing element with ±0.1% FS accuracy and excellent long-term stability. Resistant to overpressure damage with 3× to 10× overload capacity depending on measurement range.

LoRa Long-Range Wireless

German-engineered LoRa module provides stable data transmission up to 5 km in open environments. Supports 433/470/868/915 MHz frequency bands for global regulatory compliance.

Cloud IoT Platform

Integrated monitoring system accessible via PC browser, mobile APP, or WeChat mini-program. Real-time DP display, historical trend analysis, configurable alarm thresholds, and automatic data export for compliance reporting.

3+ Year Battery Life

High-capacity 3.6V lithium battery with ultra-low power management. Configurable reporting intervals from 1 minute to 24 hours. Optional solar panel or 24VDC external power for continuous monitoring.

Multiple Measurement Modes

Supports gauge pressure, absolute pressure, and differential pressure measurement. Interchangeable sensing modules allow field configuration for different measurement requirements.

Hazardous Area Options

Optional Ex ia IIC T6 intrinsic safety certification for Zone 0/1/2 installations. IP65/IP67 protection for outdoor and harsh industrial environments.

Application Scenarios

The HM200D wireless differential pressure transmitter is designed for distributed DP monitoring applications where traditional wired transmitters are impractical due to distance, installation cost, or terrain challenges:

HVAC Duct & Room Pressure Monitoring

Monitor supply/return/exhaust duct pressures and room pressurization in commercial buildings. Wireless installation reduces retrofit costs in existing HVAC systems while maintaining continuous airflow monitoring.

Filter Differential Pressure Monitoring

Track filter clogging across HVAC, industrial gas distribution, and compressed air systems. Cloud alerts notify maintenance teams when DP exceeds thresholds, optimizing filter replacement schedules and reducing system downtime.

Flow Measurement (Orifice Plate / Venturi)

Measure flow rates using differential pressure across orifice plates and Venturi tubes. High-precision ±0.1% FS accuracy supports custody transfer and process control applications.

Cleanroom & Laboratory Pressure Control

Monitor pressure differential between cleanroom and adjacent spaces to ensure proper pressurization. Meet ISO 14644 requirements with continuous cloud-based data logging and regulatory compliance export.

Industrial Boiler Draft Monitoring

Monitor furnace draft pressure and combustion air DP for boiler efficiency optimization and emissions control. Wireless sensors eliminate wiring complexity in retrofit applications.

Stack Gas Flow Monitoring

Measure exhaust stack differential pressure for EPA/CEMS reporting and air pollution control system monitoring. High-precision measurement and reliable wireless transmission support continuous emissions monitoring.

Ordering Guide

The HM200D uses a modular ordering system. Select the variant, differential pressure range, accuracy class, and options to configure your wireless differential pressure transmitter:

Selection	Options
Model Variant	HM200D-A: Standard LoRa (no display) \| HM200D-B: LoRa + LCD display \| HM200D-C: LoRa + LCD + Ex ia explosion-proof
DP Range	0–100 kPa, 0–250 kPa, 0–500 kPa, 0–1 MPa, 0–3 MPa (custom available)
Accuracy Class	0.5% FS (standard) \| 0.25% FS \| 0.1% FS (single crystal silicon)
LoRa Frequency	433 MHz \| 470 MHz (China) \| 868 MHz (EU) \| 915 MHz (US/AU)
Process Connection	M20×1.5 (default) \| Flanged \| Custom
Power Supply	Built-in lithium (default) \| Rechargeable \| 24VDC external \| Solar panel

Contact our engineering team for assistance selecting the optimal configuration for your specific differential pressure measurement requirements.

Frequently Asked Questions

The HM200D supports three measurement modes: gauge pressure (relative to atmosphere), absolute pressure (referenced to vacuum), and differential pressure (between two process ports). This flexibility allows a single device to be configured for filter monitoring, flow measurement, or cleanroom pressurization applications simply by selecting the appropriate measurement mode during setup.

The HM200D differential pressure sensor is engineered with robust single crystal silicon construction that tolerates 3× to 10× rated differential pressure overload depending on the selected range. For example, a 0–100 kPa DP transmitter can survive accidental 1 MPa overload events without permanent damage to the sensing element. This high overload capacity makes the HM200D ideal for industrial environments where transient pressure spikes may occur.

Yes. The HM200D is well-suited for flow measurement using differential pressure devices such as orifice plates, Venturi tubes, and flow nozzles. The high-precision ±0.1% FS accuracy and stable long-term performance support custody transfer and process control applications. The differential pressure measurement directly correlates to volumetric flow rate through the flow device, and LoRa wireless transmission eliminates the need for signal cables between remote monitoring locations.

The HM200D standard offering includes 0–100 kPa differential pressure range, which is suitable for HVAC duct pressure monitoring, low-range filter monitoring, and soft-start valve applications. Custom ranges below 100 kPa can be specified for specialized low-pressure applications. For ultra-low differential pressure measurement (less than 50 kPa), consult our engineering team for custom configurations.

Yes. The HM200D is ideal for cleanroom pressure monitoring and control. The device measures and reports pressure differential between the cleanroom and adjacent spaces, ensuring proper pressurization per ISO 14644 standards. The cloud platform provides continuous data logging and trend analysis to demonstrate compliance with regulatory requirements. Optional Ex ia IIC T6 certification and IP67 protection support installation in both conventional and hazardous cleanroom environments.

Need a Wireless Differential Pressure Solution?

Our engineering team specializes in wireless differential pressure monitoring for HVAC, flow measurement, and industrial process applications. Whether you need standard filter monitoring or high-precision flow measurement with explosion-proof certification, we can configure the right HM200D system for your requirements.

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

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HM200 SERIES — WIRELESS DIFFERENTIAL PRESSURE MONITORING

HM200D Wireless Differential Pressure Transmitter

Wireless Differential Pressure Monitoring for HVAC & Process

Technical Specifications