1. Introduction
The FRD Sensor FD3051LD Remote Flange Liquid Level Transmitter is designed for continuous liquid-level measurement in tanks, vessels, and industrial process applications.
With remote flange diaphragm seals, the FD3051LD is suitable for applications involving corrosive, high-temperature, viscous, or crystallizing media where conventional pressure connections may be difficult to use. It provides reliable level measurement while supporting flexible installation and system integration.
2. Why Choose This Model?
Liquid-level measurement in industrial processes can be affected by difficult installation, corrosive or viscous media, temperature changes, and unstable measurement signals.
The FD3051LD is designed to address these common application challenges.
1. Reliable Remote Flange Level Measurement
The remote diaphragm seal design helps isolate the transmitter from challenging process media and supports reliable liquid-level measurement.
2. Suitable for Challenging Media
It is suitable for applications involving corrosive, viscous, high-temperature, or crystallizing media.
3. Flexible Installation
The remote flange configuration provides greater flexibility for tanks and vessels where direct pressure connections are difficult to install.
4. Stable Industrial Measurement
The transmitter supports continuous level monitoring and is designed for long-term industrial operation.
Key Selection Factor Comparison
| Key Selection Factor |
FRD Sensor FD3051LD |
WIKA DPT-20 + Remote Diaphragm Seals |
Endress+Hauser Deltabar FMD78 |
| Product Type |
Remote Flange Liquid Level Transmitter |
Differential Pressure Transmitter + Remote Diaphragm Seals |
Differential Pressure / Level Transmitter with Two Diaphragm Seals |
| Measurement Range |
0–0.5 mH₂O ～ 10 mH₂O |
−10…+10 mbar to −16…+16 bar |
100 mbar–40 bar |
| Accuracy |
±0.25%FS / ±0.5%FS |
< ±0.065% of span |
±0.075% + diaphragm seal influence |
| Process Medium |
Liquids, gases, or steam |
Liquids, gases and other process media; configuration dependent |
Liquids, vapors, gases and dusts |
| Output Signal |
4–20 mA + HART / 1–5 V DC / RS485 |
4–20 mA / HART / FOUNDATION Fieldbus / PROFIBUS PA |
4–20 mA HART / PROFIBUS PA / FOUNDATION Fieldbus |
| Ambient Temperature |
−20°C to +80°C |
Configuration dependent |
−50°C to +85°C |
| Process Temperature |
−40°C to +200°C; 30°C to +300°C optional |
Configuration dependent; dependent on diaphragm seal and fill fluid |
Up to −70°C to +400°C |
| Long-Term Stability |
0.1%FS / year |
<0.065% * TD / year |
0.08% URL / year |
| Remote Diaphragm Seal |
Supported |
Available with mounted diaphragm seals |
Two capillary diaphragm seals |
| Electrical Connection |
M20*1.5(F), special customization available |
Configuration dependent |
Configuration dependent |
| Protection / Certification |
IP65; Ex ia I CT6 Ga / Ex d II CT6 Gb / Ex tD A21 IP66 T80°C |
Intrinsic safety / flameproof options available |
ATEX, FM, CSA, IECEx and other approvals |
| OEM / ODM |
Supported |
Standard product system |
Standard product system |
| Customization |
Special range, connection and structural customization available |
Mainly standard configuration |
Mainly standard configuration |
| Batch Supply |
Supported |
Global supply system |
Global supply system |
| OEM Cooperation Value |
Flexible customization + direct manufacturer support |
Standardized international product |
Standardized international product |
Products Parameters
| Range |
0-0.5m ~ 10mH₂O (see the selection table for details) |
| Accuracy |
0.25%FS, 0.5%FS |
| Output Signal |
4～20mA with HART, 1V ~ 5V DC, RS485 protocol |
| Process Medium |
Liquids, gases, or steam |
| Power Supply |
(12～32)VDC (24VDC recommended) |
| Ambient Temperature |
-20～80℃ |
| Medium temperature |
-40℃ ~ 200℃, 30℃ ~ 300℃ (optional) |
| Long-term Stability |
0.1% F.S / year |
| Electronic Connection |
M20*1.5(F), special customization available |
| Protection Class |
IP65 |
| Explosion-proof Grade |
Exia 1l CT6 Ga,Exd ll CT6 Gb,ExtD A21 IP66 T80℃ |
| Products Warranty |
12 moths |
4. FRD Sensor FD3051LD OEM & ODM Customization Services
FRD Sensor provides OEM and ODM customization services for the FD3051LD, supporting equipment manufacturers, system integrators, and industrial customers.
Customization can include measurement range, flange configuration, electrical connection, output signal, cable or capillary length, logo, nameplate, and packaging according to project requirements.
FRD Sensor supports customers from product configuration and sample development to batch production.
5. FRD Sensor FD3051LD Differential Pressure Transmitter Measurement Accuracy Troubleshooting Guide
If the FD3051LD shows an inaccurate or unstable level reading, check the following:
Installation: Check whether the remote flange and diaphragm seals are correctly installed and properly sealed.
Capillary Installation: Avoid excessive bending, mechanical damage, or significant temperature differences between capillaries.
Process Conditions: Check whether temperature, pressure, or medium conditions have changed significantly.
Zero-Point Deviation: Verify the actual liquid level and inspect the diaphragm seals for contamination, blockage, or damage.
Correct installation and regular inspection can help maintain stable liquid-level measurement.
6. Application Scenarios
7. Product Drawing
8. Product Certifications
9. Conclusion
The FRD Sensor FD3051LD Remote Flange Liquid Level Transmitter provides a reliable solution for liquid-level measurement in challenging industrial applications. Its remote diaphragm seal structure, flexible signal options, and OEM/ODM capabilities make it suitable for equipment manufacturers, system integrators, and industrial process applications.
