1. Introduction
The FRD Sensor FD820C Embedded Micro Differential Pressure Transmitter is a compact differential pressure measurement solution designed for applications where installation space is limited and stable low-pressure measurement is required.
With an embedded compact design, the FD820C can be integrated into equipment and control systems while providing reliable differential pressure signals for monitoring and automation. Its digital communication capability also makes it suitable for modern industrial control and data acquisition systems.
The FD820C is well suited for air pressure monitoring, equipment differential pressure measurement, ventilation systems, environmental control, industrial automation, and other low-pressure applications.
2. Why Choose This Model?
In practical applications, customers often face several challenges when selecting a micro differential pressure transmitter:
- Limited installation space inside equipment
- Difficulty installing conventional differential pressure transmitters
- Unstable low-pressure measurements
- Need for remote data communication
- Increasing requirements for automated monitoring
- High maintenance costs caused by unsuitable instruments
The FRD Sensor FD820C is designed to address these challenges with a compact structure and flexible signal interface.
Compact Embedded Design
Traditional differential pressure transmitters can take up considerable installation space. This can become a problem when the transmitter needs to be integrated into compact equipment.
The FD820C adopts an embedded micro design, making it easier to integrate into equipment and systems where installation space is restricted.
Designed for Low Differential Pressure Measurement
For ventilation, air pressure, equipment monitoring, and other low-pressure applications, measurement stability is essential.
The FD820C is designed specifically for micro differential pressure measurement, helping users obtain reliable pressure difference data for equipment monitoring and automatic control.
Multiple Communication Options
Modern industrial equipment increasingly requires digital data transmission rather than relying only on conventional analog signals.
The FD820C supports 4–20 mA DC and RS485 communication, with MODBUS RTU available for digital communication, making it easier to connect the transmitter with PLCs, control systems, and other automation equipment.
Integrated Relay Function
For applications requiring alarm or control functions, the FD820C can be configured with a relay output.
This allows the transmitter to participate directly in equipment monitoring and alarm systems, reducing the need for additional control components.
Suitable for Industrial Automation
The compact design, digital communication, and flexible output configuration make the FD820C suitable for a variety of equipment and automation applications.
It can be used for air pressure monitoring, ventilation equipment, environmental systems, industrial automation, and differential pressure monitoring inside machinery.
3. Model Comparison Table
| Parameter |
FRD Sensor FD820C |
H******l DPTE1000 |
S*****s QBM3120-25 |
| Product Type |
Embedded Micro Differential Pressure Transmitter |
Differential Pressure Transmitter |
Differential Pressure Sensor |
| Pressure Range |
0–100 Pa to 2500 Pa |
0–1000 / 2500 Pa |
0–2500 Pa |
| Accuracy |
±0.5% F.S.; ±1.0% F.S. optional |
≤ ±1.0% F.S. |
— |
| Operating Temperature |
0°C to 60°C |
0°C to 50°C |
— |
| Power Supply |
16–32 VDC |
18–30 V AC/DC |
24 V AC/DC |
| Output Signal |
4–20 mA / RS485 + Relay |
0–10 V / 4–20 mA |
4–20 mA |
| Communication Protocol |
MODBUS RTU |
Analog Output |
Analog Output |
| Explosion Protection |
Ex ia IIB T6 Ga |
— |
— |
| Construction |
Compact Embedded Design |
Compact Transmitter Design |
Compact Sensor Design |
| Typical Applications |
Cleanrooms, HVAC, Medical Equipment, Laboratories, Electronics Manufacturing, Industrial Ventilation |
HVAC, Ventilation, Building Automation |
HVAC, Ventilation, Air Handling |
| Parameter |
FD820C |
| Range |
0-100Pa~2500Pa |
| Pressure Type |
Differential Pressure |
| Overload Capacity |
Allows overload pressure 2 times and destroys pressure 4 times the sensor range |
| Accuracy |
0.5%F.S; 1.0%F.S(optional) |
| Long Term Stability |
0.2%F.S/Year |
| Operating Temperature |
0℃~60℃ |
| Power Supply |
16V~32VDC |
| Output Signal |
4mA~20mA DC,RS485+Relay |
| Protocol |
MODBUS RTU |
| Explosion-Proof |
Ex ia IIB T6 Ga |
| Ambient Temperature |
Stainless Steel |
| Warranty Period |
12 months |
4. FRD Sensor FD820C OEM & ODM Customization Services
Different equipment and automation systems may have different requirements for measurement range, communication, installation structure, and electrical interfaces.
FRD Sensor provides OEM & ODM customization services for the FD820C Embedded Micro Differential Pressure Transmitter, helping customers develop products that match their specific equipment and application requirements.
Customization options may include:
- Measurement range configuration
- Accuracy selection
- Output signal configuration
- RS485 and MODBUS RTU communication
- Relay function configuration
- Electrical connection
- Pressure connection
- Housing and structural design
- Customer logo and nameplate
- Packaging customization
From initial technical requirements to sample development and mass production, FRD Sensor can provide integrated customization support for equipment manufacturers and system integrators.
5. FRD Sensor FD820C Embedded Micro Differential Pressure Transmitter Measurement Accuracy Troubleshooting Guide
When the FD820C shows unstable readings, incorrect output, or communication problems, users can follow the troubleshooting steps below.
Step 1: Check the Power Supply
Confirm that the power supply is stable and within the transmitter's specified operating range.
An unstable power supply can cause abnormal output signals or communication problems.
Step 2: Check the Pressure Connections
Inspect the high-pressure and low-pressure connections and make sure they are correctly connected.
Check for leakage, blockage, loose connections, or damaged pressure tubing.
Step 3: Check the Actual Differential Pressure
Verify the actual pressure difference using a calibrated reference instrument.
If the actual differential pressure exceeds the suitable measurement range, the output may become inaccurate or saturated.
Step 4: Check Installation Conditions
Improper installation, excessive vibration, mechanical stress, or pressure tubing problems can affect measurement stability.
Make sure the transmitter is securely installed and that the pressure connections are properly arranged.
Step 5: Check the Output and Communication
If the pressure measurement is correct but the transmitted signal is abnormal, check:
- 4–20 mA wiring
- RS485 wiring
- Communication parameters
- MODBUS RTU settings
- Relay configuration
- Electrical interference
Step 6: Perform Calibration Verification
If the measurement deviation remains after the above checks, compare the FD820C output with a calibrated reference instrument.
If necessary, perform recalibration or contact FRD Sensor for technical support.
6. Application Scenarios
7. Product Certifications
8. Packing
9.Conclusion
The FRD Sensor FD820C Embedded Micro Differential Pressure Transmitter provides a compact and practical solution for low differential pressure measurement where installation space, communication, and automation are important considerations.
Its embedded compact structure, flexible output options, digital communication capability, and relay function make it suitable for equipment monitoring, ventilation systems, industrial automation, and other low-pressure measurement applications.
For equipment manufacturers and system integrators looking for a compact, reliable, and customizable micro differential pressure transmitter, the FD820C offers a flexible solution backed by FRD Sensor's OEM & ODM capabilities.
