Product Overview

Capillary Differential Pressure Transmitter uses remote diaphragm seals connected by capillary tubes to isolate the sensing element from high-temperature, corrosive, viscous, or sanitary media while providing accurate differential pressure, level, and interface measurement in process industries.

Key Features

Remote diaphragm seal design isolates the sensor from harsh process media, improving long-term reliability.
Capillary-filled transmission system enables stable pressure transfer for high-temperature and difficult measurement applications.
Single crystal silicon sensing technology delivers high accuracy up to ±0.05% with low long-term drift.
Digital temperature compensation minimizes thermal influence and maintains measurement stability.
Supports 4–20mA and HART communication, enabling remote configuration and diagnostics.

Typical Applications

Steam process differential pressure measurement

Pressure measurement in viscous media

Interface measurement in closed tanks

Boiler drum level measurement

Reactor vessel level monitoring

Storage tank level measurement

Refinery process instrumentation

Food and beverage sanitary tanks

Oil and gas separator monitoring

Pharmaceutical process vessels

Corrosive chemical process control

HNP30-D Intelligent High-Precision Single Crystal Silicon Dual Remote Transmission Flat Film/Insert Cylinder Flange Level Transmitter
Specific Parameters	Value / Description
Measurement Principle	HNP-D Intelligent High-Precision Dual Remote Transmission Flange Level Transmitter, using high-precision silicon pressure sensors and advanced packaging technology, the sensor is far away from the medium, mechanical and thermal isolation, strong electrical insulation. The influence of temperature is minimal, stable anti-interference, supports Hart protocol communication, with digital temperature compensation, high accuracy, small drift. External one-key reset, convenient operation, safe and reliable.
Transducer Type	Intelligent Remote Transmission Differential Pressure Transmitter/Intelligent Remote Transmission Pressure Transmitter
Measurement Medium	Gas, vapor, liquid
Inaccuracy	±0.05%, ±0.075%, ±0.1% (including linearity, hysteresis, and repeatability from zero point)
Stability	±0.1%/3 years
Power Supply	10～36V DC (recommended 24V DC)
Display	LCD, OLED
Transducer Housing	Aluminum alloy material, epoxy resin sprayed
Diaphragm	316L Stainless Steel, Hastelloy C, Monel Alloy, Tantalum, Titanium, Sprayed Tetrafluoroethylene, Special Requirements
Transmission Method	Double Flat Flange Type, Double Insert Flange Type, High Pressure Side Insert Tube Flange, Low Pressure Side Flat Diaphragm Flange, High Pressure Side Flat Diaphragm Flange, Low Pressure Side Insert Tube Flange
Filling Liquid	Silicone Oil, Fluorine Oil, High Temperature Silicone Oil, etc.
Insert Tube Material	Stainless Steel 304, 316L
Nuts and Bolts	Carbon steel galvanized, stainless steel
Electrical Connection	M20*1.5(standard), 1/2NPT internal thread
Medium Temperature	-40℃ ~85℃
Temperature Measurement	-40℃~120℃
Output Signal	4~20mA, 4~20mA+Hart
Explosion Proof Type	Flameproof, explosion-proof grade ExdⅡCT6, intrinsically safe, explosion-proof grade ExiaⅡCT6
Certification	CE, ISO9001, SIL

OEM & Customization

Pressure Range Customization for differential pressure, level, and pressure measurement requirements.
Capillary Length Options according to installation distance and process layout.
Diaphragm Seal Types including flat flange, extended flange, insertion type, and customized structures.
Process Connection Customization based on flange standards, sizes, pressure classes, and customer drawings.
Private Label OEM Service including logo printing, model numbering, labels, packaging, and documentation.
Project-Based Configuration Support for special media, temperature, installation, and compliance requirements.

Certifications & Compliance

CE – Compliance with applicable European safety, health, and EMC requirements.
ISO 9001 – Certified quality management system for manufacturing consistency.
SIL – Functional safety certification for safety instrumented system applications.
Ex d IIC T6 – Flameproof explosion protection for hazardous areas.
Ex ia IIC T6 – Intrinsically safe explosion protection for hazardous environments.
RoHS (optional if required) – Restriction of hazardous substances compliance.

FAQ

Q: How does a capillary differential pressure transmitter work?

A: Pressure is transferred from remote diaphragm seals through fluid-filled capillary tubes to the sensing element, allowing measurement while isolating the sensor from the process medium.

Q: When should a capillary seal system be selected instead of a standard differential pressure transmitter?

A: It is commonly used for high-temperature, corrosive, crystallizing, viscous, sanitary, or difficult-to-access process media.

Q: What information is required for model selection?

A: Medium type, operating temperature, pressure range, installation method, flange specifications, capillary length, and output requirements are typically required.

Q: Are calibration certificates provided before shipment?

A: Calibration and inspection reports can be supplied according to customer specifications and project requirements.

Q: What is the typical warranty period?

A: Warranty terms vary by project and market requirements, with industrial applications commonly covered by a 12-month warranty after shipment.

HNP30-D Intelligent High-Precision Single Crystal Silicon Dual Remote Transmission Flat Film/Insert Cylinder Flange Level Transmitter
Specific Parameters	Value / Description
Measurement Principle	HNPD Intelligent High-Precision Dual Remote Transmission Flange Level Transmitter, using high-precision silicon pressure sensors and advanced packaging technology, the sensor is far away from the medium, mechanical and thermal isolation, strong electrical insulation. The influence of temperature is minimal, stable anti-interference, supports Hart protocol communication, with digital temperature compensation, high accuracy, small drift. External one-key reset, convenient operation, safe and reliable.
Transducer Type	Intelligent Remote Transmission Differential Pressure Transmitter/Intelligent Remote Transmission Pressure Transmitter
Measurement Medium	Gas, vapor, liquid
Inaccuracy	±0.05%, ±0.075%, ±0.1% (including linearity, hysteresis, and repeatability from zero point)
Stability	±0.1%/3 years
Power Supply	10～36V DC (recommended 24V DC)
Display	LCD, OLED
Transducer Housing	Aluminum alloy material, epoxy resin sprayed
Diaphragm	316L Stainless Steel, Hastelloy C, Monel Alloy, Tantalum, Titanium, Sprayed Tetrafluoroethylene, Special Requirements
Transmission Method	Double Flat Flange Type, Double Insert Flange Type, High Pressure Side Insert Tube Flange, Low Pressure Side Flat Diaphragm Flange, High Pressure Side Flat Diaphragm Flange, Low Pressure Side Insert Tube Flange
Filling Liquid	Silicone Oil, Fluorine Oil, High Temperature Silicone Oil, etc.
Insert Tube Material	Stainless Steel 304, 316L
Nuts and Bolts	Carbon steel galvanized, stainless steel
Electrical Connection	M20*1.5(standard), 1/2NPT internal thread
Medium Temperature	-40℃ ~85℃
Temperature Measurement	-40℃~120℃
Output Signal	4~20mA, 4~20mA+Hart
Explosion Proof Type	Flameproof, explosion-proof grade ExdⅡCT6, intrinsically safe, explosion-proof grade ExiaⅡCT6
Certification	CE, ISO9001, SIL

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