RDCL Micro Differential Pressure Transmitter RDCLDPSW2000
The RDCL Micro Differential Pressure Transmitter is a precision industrial pressure measurement instrument designed for monitoring low differential pressure, positive pressure and negative pressure in gas and air systems.
It provides reliable pressure measurement with a range of negative 5 kPa to positive 5 kPa, 0.5% accuracy and a standard 4 to 20 mA analog output.
The transmitter operates on a 12 to 30 V DC power supply and is designed for continuous pressure monitoring in industrial and environmental control applications.
Available with optional LCD or LED display and RS485 output configurations, the compact micro differential pressure sensor supports integration with compatible PLC, DCS and building management systems.
The RDCL Micro Differential Pressure Transmitter is suitable for HVAC systems, pharmaceutical cleanrooms, ventilation equipment, industrial filtration systems and process automation applications.
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A. Product Overview
The RDCL Micro Differential Pressure Transmitter measures small pressure differences in industrial air and gas systems using silicon piezoresistive sensing technology. It converts pressure differences into electrical signals for remote monitoring through compatible PLC, DCS, SCADA and building automation systems.
Designed for HVAC ducts, pharmaceutical cleanrooms, ventilation, filters and boiler draft monitoring, it provides a standard two-wire 4 to 20 mA output, optional RS485 and display options. Temperature compensation, a damping filter and adjustable zero and full scale support stable low-pressure measurement.
Key Features
Sensitive measurement of differential, gauge and negative gas pressure.
Measuring range: -5 kPa to +5 kPa.
Silicon piezoresistive sensor with 0.5% accuracy class.
Standard two-wire 4 to 20 mA output; optional RS485.
Versions without display or with LED or LCD display.
12 to 30 V DC supply, suitable for standard 24 V DC systems.
Temperature compensation and damping filter.
Field-adjustable zero and full scale.
Long-term stability: ≤0.1% FS per year.
Overload capacity: 150% of rated range.
Compact design with configurable pressure and electrical connections.
Technical Specifications
Parameter | Specification |
|---|---|
Brand | RDCL |
Product Name | Micro Differential Pressure Transmitter |
Measurement Type | Differential, gauge and negative pressure |
Measuring Range | -5 kPa to +5 kPa |
Measuring Medium | Gas |
Sensor Technology | Silicon piezoresistive pressure sensor |
Accuracy Class | 0.5% |
Analog Output | 4 to 20 mA |
Digital Output | RS485, optional |
Display Options | No display, LED or LCD |
Power Supply | 12 to 30 V DC |
Long-Term Stability | ≤0.1% FS per year |
Overload Capacity | 150% |
Ambient Temperature | -20°C to 60°C |
Medium Temperature | -20°C to 60°C |
Electrical Connection | Direct cable outlet |
Pressure Connections | M8 tower connector or PC8-M6 quick-connect fitting |
Field Adjustment | Zero and full-scale adjustment |
Applications | HVAC, cleanrooms, ventilation, filtration and process control |
Note: Display, output, pressure connection and electrical options depend on the selected variant. Confirm specifications before ordering.
B. Working Principle
The transmitter uses a silicon piezoresistive sensing diaphragm. A difference between pressures at its two ports deforms the diaphragm and produces an electrical signal proportional to differential pressure.
Step 1: Pressure Detection
High-pressure and low-pressure ports connect to two measurement points. The pressure difference acts on the internal sensor, allowing detection of small gas-pressure variations.
Step 2: Piezoresistive Sensing
Pressure-sensitive resistors arranged as a Wheatstone bridge change resistance when the silicon diaphragm deforms.
Step 3: Electrical Signal Generation
The Wheatstone bridge converts resistance changes into a low-level voltage corresponding to the measured pressure difference.
Step 4: Signal Conditioning
Electronics amplify, filter and temperature-compensate the signal. A damping filter reduces disturbances from brief pressure fluctuations.
Step 5: Standard Signal Output
In its two-wire analog configuration, the transmitter provides 4 to 20 mA scaled to the selected range. Example for a linear -5 kPa to +5 kPa range:
Differential Pressure | Analog Output |
|---|---|
-5 kPa | 4 mA |
-2.5 kPa | 8 mA |
0 kPa | 12 mA |
+2.5 kPa | 16 mA |
+5 kPa | 20 mA |
Step 6: PLC and Automation Integration
The signal can connect to compatible PLCs, DCS, SCADA, BMS, process indicators, data loggers or AHU panels for measurement, alarms and control.
Step 7: Continuous Monitoring
The transmitter continuously measures pressure changes. External controllers can use its output to identify filter blockage, abnormal airflow, ventilation faults and room-pressure variations.
C. Why Is the RDCL Micro Differential Pressure Transmitter Used?
Low differential pressure measurement helps monitor ventilation performance, filtration condition, controlled environments and industrial processes.
1. HVAC Differential Pressure Monitoring
Measures pressure across AHU filters, ducts, supply and return air paths, and fans. Its output supports compatible HVAC monitoring and automation systems.
2. Pharmaceutical Cleanroom Pressure Monitoring
Measures small pressure differences between cleanrooms, corridors, laboratories and airlocks, including positive and negative room pressures. Verify the selected range, accuracy and calibration for critical cleanroom use.
3. Industrial Air Filter Monitoring
Tracks pressure drop across filters. Increasing differential pressure under comparable airflow conditions can indicate dust buildup and the need for cleaning or replacement.
4. Ventilation and Exhaust Systems
Monitors factory ducts, exhaust systems, extraction equipment, ventilation fans and underground ventilation. Connected controllers can monitor fan performance and ventilation pressure.
5. Boiler Combustion Air Pressure Monitoring
Measures suitable low-pressure combustion air and furnace draft conditions. Gas composition and operating temperature must stay within device limits.
6. Building Management Systems
Provides pressure signals to compatible BMS equipment for remote monitoring of HVAC pressure, air filters and ventilation systems.
7. Pneumatic Conveying Systems
Monitors compatible low-pressure gas circuits for pressure changes associated with conveying resistance, leakage or potential blockages.
8. Air Velocity Measurement
When used with a suitable Pitot tube or differential pressure arrangement, the measured dynamic pressure can be converted into air velocity by an external calculation system.
9. Industrial Process Automation
Supplies measurements to automation systems for pressure monitoring, data recording, alarm generation and programmed control of fans, filters and ventilation equipment.
D. Suitable Buyers
The RDCL Micro Differential Pressure Transmitter is intended for HVAC contractors, industrial equipment manufacturers, cleanroom operators, automation integrators and maintenance teams.
Buyer Category | Typical Application |
|---|---|
HVAC Contractors | Duct and ventilation pressure monitoring |
Pharmaceutical Companies | Cleanroom differential pressure monitoring |
Cleanroom Contractors | Room and airlock pressure measurement |
Air Handling Unit Manufacturers | AHU filter and fan monitoring |
Industrial Automation Companies | PLC and process control integration |
BMS Integrators | Building HVAC pressure monitoring |
Hospital Facility Maintenance Teams | Controlled room pressure monitoring |
Laboratory Equipment Manufacturers | Low differential pressure measurement |
Air Filter Manufacturers | Filter pressure drop testing |
Industrial Ventilation Contractors | Exhaust and duct pressure monitoring |
Boiler Manufacturers | Combustion air and draft monitoring |
Dust Collection Equipment Manufacturers | Filter condition monitoring |
Control Panel Manufacturers | Differential pressure instrumentation |
OEM Machine Builders | Low-pressure sensor integration |
Engineering Procurement Companies | Industrial pressure instrumentation |
Industrial Maintenance Engineers | Pressure troubleshooting and monitoring |
E. Frequently Asked Questions (FAQ)
Q1. What is the RDCL Micro Differential Pressure Transmitter?
An industrial device for measuring small pressure differences in air or gas systems and converting them into an electrical output for monitoring and automation.
Q2. What is its measurement range?
The specified measurement range is -5 kPa to +5 kPa for small positive and negative differential pressures.
Q3. Does it support 4 to 20 mA output?
Yes. A standard two-wire 4 to 20 mA output is available for compatible industrial inputs.
Q4. What power supply is required?
It operates on 12 to 30 V DC, including standard 24 V DC industrial supplies when correctly wired.
Q5. Can it be used in pharmaceutical cleanrooms?
Yes, for monitoring differential pressure between rooms, corridors and airlocks, subject to required range, accuracy and calibration.
Q6. What is its accuracy?
The specified accuracy class is 0.5%.
Q7. Does it have a display?
Versions are available without a display or with an optional LED or LCD display.
Q8. Can it connect to a PLC?
Yes. Its 4 to 20 mA output connects to a compatible PLC analog input. Selected RS485 versions can connect to compatible digital systems.
Q9. Does it support RS485 communication?
Yes, an RS485 variant is available. Confirm communication protocol and interface details before integration.
Q10. Can it measure negative pressure?
Yes. It supports negative pressure measurement within its specified range for appropriate ventilation and furnace draft applications.
