Introduction

The FineTek magnetostrictive level transmitter is a high-precision sensor designed for continuous liquid level measurement in diverse industries such as petrochemical, marine, food and beverage, and wastewater treatment. It offers loop-powered operation with analog and digital outputs, robust construction for extreme conditions, and requires no recalibration after power interruptions. Key features include high accuracy, fast response, dust and pressure resistance, dual oil/water level indication, and explosion-proof variants.

Applications

• Liquefied natural gas
• Crude oil, petroleum, diesel
• Chemical processing
• Pharmaceuticals and medication
• Food and beverage production
• Dams, water barriers, wastewater treatment
• Power plants, marine and shipbuilding
• Tooling or alignment position for processing machines

Operating Principle

The transmitter uses magnetostrictive wire inside a stem and a permanent magnet inside a float. An electrical current generates a magnetic field in the stem; when the float’s magnetic field intersects, a torsional force is induced. The sensor measures the time between torsional forces, converting it to distance for continuous, prompt liquid level detection. Outputs include 4~20mA analog and digital RS485.

Product Models and Specifications

Standard Models (2-Wire)

• Models EG31 and EG31 High Temperature
• Measuring range: 50 to 5500 mm
• Accuracy: ±0.05% F.S. or ±1.0 mm
• Operating temperature: -40°C to 125°C (standard), up to 200°C (high temp)
• Max pressure: 30 BAR
• Outputs: 4~20mA, optional RS485/HART
• Housing: SUS304 or SUS316, IP67/IP69K protection

High Accuracy Models (2-Wire/4-Wire)

• Models EG32 and EG34
• Accuracy: as low as ±0.002% F.S.
• Operating temperature: up to 125°C
• Max pressure: 30 BAR
• Outputs: 4~20mA, 0~10V, RS485/HART
• Suitable for high precision and HART communication

Explosion-Proof Models

• Models EG37 and EG36
• Certifications: ATEX, NEPSI
• Operating temperature: up to 195°C
• Max pressure: 30 BAR
• Outputs: 4~20mA, RS485/HART
• Housing: SUS304 or aluminum, IP67/IP69K
• Requires safety barriers compliant with Ex ia rating

Float Specifications

Multiple float types are available with varying dimensions, materials (SUS304, SUS316, PP, NBR), specific gravities, and pressure ratings. Floats are matched to stem sizes and application needs, including anti-corrosion options.

Wiring and Communication

• Supports loop power 24Vdc ±10%
• Wiring configurations for RS485 (ModBus), HART, and analog 4~20mA outputs
• Color codes and pin assignments vary by model

Installation Guidelines

• Use loop power 24Vdc ±10%
• Factory calibrated; no user calibration required
• Avoid bending or applying pressure to the stem
• Use supplied float for optimal performance
• Install stem and float carefully; float direction mark must face housing
• Secure float stopper firmly
• Return bent stems to factory for recalibration
• Use bubble wrap or foam packaging for transport
• Avoid unnecessary housing opening to maintain accuracy

Ordering Information

• Ordering codes specify output type, housing connection, temperature rating, conduit position, probe material, measuring range, and float type
• Probe length = measuring range + float height + 15mm
• For ranges over 2000mm, thicker stem diameter (f16) recommended for durability

Key Parameters and Limitations

• Measuring range: 50 mm to 5500 mm
• Operating temperature: -40°C to 200°C depending on model
• Max pressure: up to 30 BAR
• Accuracy: from ±0.05% F.S. to ±0.002% F.S.
• Output options: 4~20mA, 20~4mA, 0~10V, RS485, HART
• Enclosure protection: IP67 (housing), IP69K (probe)
• Explosion-proof certifications: ATEX, NEPSI

Best Practices

• Use recommended floats and stem sizes to ensure accuracy
• Follow wiring diagrams carefully for communication protocols
• Ensure proper installation orientation and secure float stopper
• Use explosion-proof models and safety barriers in hazardous environments
• Order appropriate stem length considering blanking zones and float dimensions

Detailed Ordering and Technical Specifications

1. Ordering Codes and Parameters

• Measuring ranges from 50mm to 5500mm with defined increments
• Analog output options include various current and voltage signals (e.g., 4~20mA, 0~10V)
• Housing and connection types cover multiple flange sizes and thread standards with pressure ratings
• Probe and float materials include SUS304, SUS316, SUS316L with anti-corrosion coatings (PP, NBR)
• Probe length calculation and installation notes emphasize compatibility between probe diameter and float hole size

2. Float Specifications

• Multiple float models with specified dimensions, materials, and specific gravities
• Special coatings for corrosion and temperature resistance

3. Digital and Communication Outputs

• RS485 and RS485 with thermal sensor options
• Optional HART protocol versions (7.3) with or without thermal sensors

4. Safety and Explosion-Proof Features

• Certifications: NEPSI (Ex ia IIB T2-T6), ATEX (Ex ia IIB T3-T6)
• Isolated safety barrier (TX10) for hazardous zones providing power and signal isolation
• Safety barrier features: relay and current outputs, RS-485 communication, LED indicators, DIP switches, self-test
• Operating temperature and compliance details specified

5. TX10 Isolated Safety Barrier Specifications

• Input: 0~20mA current signal
• Output: analog (0~20mA, 4~20mA, 0~5V, 0~10V) and relay outputs
• Power supply: 20~35 Vdc or 20~250 Vdc/Vac depending on model
• Response time: <5 ms
• Accuracy: 0.1% full scale at 20°C
• Isolation voltage: 2500Vac, leakage current <1mA for 1 minute
• Applicable zones: Zone 0, 1, 2; gas groups IIA, IIB, IIC; temperature classes T4 to T6

6. Installation and Usage Recommendations

• For PP coated stems, use types S, C, or E with max length 2000mm
• Probe length calculation ensures proper measurement and clearance
• Connection dimensions must accommodate float size if installing without float removal

7. Product Range and Model Codes

• Wide range of level and flow measurement devices including various level switches, transmitters, flow switches, and accessories

8. Contact and Distributor Information

Global offices and distributors listed with contact details for sales and support in China, Singapore, Germany, Taiwan, and the USA.

Critical Notes

• Ensure probe diameter is smaller than float hole diameter to avoid installation issues
• Use thicker stems for longer measuring ranges to prevent damage
• Match explosion-proof certifications to hazardous environment requirements
• Install safety barriers according to wiring diagrams and power supply limits