The Nokeval 641 user manual covers installation, configuration, troubleshooting and technical specifications for the signal converter.
The Nokeval 641 is a three‑way isolation and signal converter designed for mA, V and mV inputs and outputs. It provides galvanic separation and can convert between current and voltage signals, supporting ranges such as 4‑20 mA ↔ 0‑10 V and ±10 V ↔ 0‑10 V.
The manual explains how to mount the unit on a DIN rail, connect wiring, set input/output ranges and attenuation using DIP switches and front‑panel potentiometers, and includes troubleshooting tips and full technical data.
| Width | 22.5 mm |
|---|---|
| Height | 82 mm |
| Depth | 99 mm |
| Weight | 106 g |
| Mounting | DIN rail (DIN‑46277) |
| Terminal rating | 2 × 2.5 mm² |
| Operating temperature | 0 … 45 °C |
| Storage temperature | -40 … +70 °C |
| Protection class | IP20 |
| Enclosure material | Plastic |
| Input resistance (current) | 50 Ω |
| Input resistance (voltage) | >100 MΩ |
| Maximum output load | 600 Ω |
| Operating voltage | 24 VDC ±10 % |
| Isolation voltage | 1000 V |
| Frequency range | 0 … 1600 Hz |
The unit needs a 24 VDC supply with a tolerance of ±10 % and the supply is galvanically isolated from the signal circuits.