DIFFERENTIAL PRESSURE MEASUREMENT For matching an air-side range to the job – filter, duct static, or room pressure – see our guide on choosing an HVAC differential pressure transmitter.
Differential Pressure Transmitters
Industrial DP transmitters for flow measurement, filter monitoring, and level detection in sealed tanks. 4-20mA, HART, and RS485 outputs with accuracy up to ±0.075% FS. Ranges from 0~1 kPa to 0~10 MPa.
📘 New to DP measurement? Learn how differential pressure transmitters work — a 2026 engineer’s guide covering sensor technologies, 4-20 mA wiring and manifold commissioning.
For cleanroom and isolation-room duty, see how to choose a low-range unit in our room pressure monitoring guide.
For steam, hot oil, or high-temperature column service, start with our high-temperature differential pressure transmitter selection guide.
Our Differential Pressure Transmitter Range
From compact micro-DP sensors for HVAC air flow to smart capacitive DP transmitters for process plants — select the model that matches your application requirements.
HM30
Compact DP transmitter for micro pressure differences from 0~1 kPa. Ideal for HVAC air flow, clean room pressure monitoring.
Range: 0~1 kPa to 0~10 kPa
Accuracy: ±0.5% FS
Output: 4-20mA / 0-5V
HM31
Mid-range differential pressure transmitter for industrial flow and filter monitoring applications.
Range: 0~6 kPa to 0~3.5 MPa
Accuracy: ±0.5% FS
Output: 4-20mA / 0-5V
HM3051
HART-protocol smart differential pressure transmitter with capacitive sensing cell for process control.
Range: 0~1 kPa to 0~10 MPa
Accuracy: ±0.075% FS
Protocol: HART
HM1151
Traditional capacitive differential pressure transmitter compatible with 1151/3051 industry standards.
Range: 0~1 kPa to 0~10 MPa
Accuracy: ±0.1% FS
Output: 4-20mA
How to Choose the Right DP Transmitter
Four HM-Series differential pressure transmitters cover most DP service. Match the model to the job:
| Model | Best for | Sensing | Accuracy | Notable |
|---|---|---|---|---|
| HM3051 Smart DP | Smart/HART loops in oil & gas, chemical, power | Capacitive | ±0.1% FS | HART protocol; up to 40 MPa range |
| HM31 DP | High static-line DP service | Piezoresistive | ±0.1% FS | 0–10 kPa to 2 MPa; 20 MPa static |
| HM30 Micro DP | HVAC, cleanroom, ventilation | Micro DP | ±0.1% FS | ≤2 ms response; low DP ranges |
| HM1151 DP | Economical 4–20 mA DP loops | Capacitive δ-cell | ±0.25% FS | Dual-chamber; up to 40 MPa range |
Step 1 — Determine your pressure range: For HVAC and clean room (0~1 kPa), choose the HM30. For orifice plate flow measurement and filter monitoring (6 kPa~3.5 MPa), choose the HM31. For process plant applications requiring HART communication (up to 10 MPa), the HM3051 or HM1151 are recommended.
Step 2 — Choose your output signal: Standard 4-20mA (2-wire) is the most common for industrial control loops. Voltage output (0-5V, 0-10V) is preferred for direct data acquisition. RS485/Modbus is used for digital communication networks. HART protocol (HM3051) enables remote configuration and diagnostics over the same 4-20mA wiring.
Step 3 — Consider wetted materials and process conditions: Standard 316L stainless steel diaphragms suit most industrial fluids. For highly corrosive media (strong acids, chlorine), consult our engineers for Hastelloy C or tantalum options. Operating temperature, static pressure rating, and process connection type (flanged, threaded, or remote seal) should also match your installation requirements.
Frequently Asked Questions
Need Help Selecting a DP Transmitter?
Tell us about your application — pipe size, media type, flow range, or the pressure drop you need to measure. Our engineers typically respond within 12 business hours with a customized recommendation.
Our engineers typically respond within 12 business hours with detailed technical specifications and pricing.