Nokeval 641-4/20-4/20 Signal Isolation Converter

Nokeval 641-4/20-4/20 Signal Isolation Converter

Product Description

Nokeval (Finland) 641-4/20-4/20 is a DIN-rail mounted process signal isolation converter from the 641 series, configured for 4-20mA input and galvanically isolated 4-20mA output. It provides galvanic isolation between input and output circuits to eliminate ground loop interference and suppress EMI noise generated by VFDs and heavy motors for stable analog signals. This model can power 2-wire transmitters directly. It isolates and transmits 4-20mA field measurement signals to PLC, DCS, paperless recorders or panel meters. Compact narrow housing for DIN rail mounting, widely used for analog signal conditioning in chemical, water and energy industries.

Technical Specifications

• Product Name: 641 Series Signal Isolation Converter
• Brand: Nokeval (Finland)
• Model: 641-4/20-4/20
• Signal Range: Input 4–20mA; Galvanic isolated output 4–20mA
• Power Supply: 24VDC ±10%
• Accuracy: ±0.05% of full scale
• Isolation: 3-way isolation among input, output and power supply
• Transmitter Supply: Supports 2-wire sensor loop power
• Mounting: 35mm DIN rail snap-on installation
• Protection Class: IP20 (for cabinet mounting)
• Housing Material: ABS plastic
• Operating Temperature: -20℃ ~ +60℃
• Storage Temperature: -40℃ ~ +80℃
• Relative Humidity: 5~95%, non-condensing
• Configuration Software: MekuWin for range setup and parameter tuning
• Certifications: CE, compliant with industrial EMC requirements

Application

1. Isolation, conversion and transmission of 4-20mA analog process signals
2. Signal acquisition from 2-wire pressure, level, flow and temperature transmitters for DCS/PLC
3. Break ground loops and common-mode interference to eliminate signal drift and fluctuation
4. Signal conditioning inside control cabinets for petrochemical, water treatment, power and paper industries
5. Automation retrofit & spare part replacement, protecting back-end I/O modules from field surge

Same Series Models

641-0/20-0/10, 641-4/20-0/10, 641-0/10-4/20, 641-TC-4/20, 641-RTD-4/20