PMV F5‑MEC‑420

Technical Specifications

2 × SPDT mechanical micro‑switches; 4‑20 mA position‑transmitter output; transmitter supply 9‑28 VDC, recommended 24 VDC; maximum load impedance 800 Ω at 24 VDC; working rotation travel range 30°‑90°; linearity <1 % full‑scale; hysteresis <0.5 % full‑scale; operating temperature ‑20 °C ~ +80 °C; epoxy‑coated aluminum housing; unit weight 0.7 kg for standard enclosure version.

Functional Features

Visual local valve‑position indicator window; zero‑and‑span adjustment potentiometers for 4‑20 mA output; mechanical cam adjustment for limit‑switch trigger‑points; ATEX, CSA, FM hazardous‑area certification options available; modular‑assembly compatible with PMV P5 / EP5 valve positioners.

Application Scenarios

Oil‑gas pipeline valve monitoring, petrochemical plant control‑valve feedback, power‑plant auxiliary valves, water‑treatment plant actuator position indication, refinery rotary‑valve remote status monitoring.

Performance Parameters

Mechanical switch rating 6 A 250 VAC resistive load; 4‑20 mA output current limit 24 mA DC; infinite resolution for position‑transmitter output.

Material Composition

Epoxy‑coated cast‑aluminum housing, stainless‑steel shaft‑cam mechanism, SPDT mechanical micro‑switches, plastic viewing window, internal precision potentiometer assembly.

Structural Features

Square compact housing; bottom‑side actuator‑shaft coupling interface; side threaded cable‑entry ports; front transparent indicator window showing valve‑opening percentage; external calibration access for zero‑span and cam‑setting.

Working Principle

Rotary shaft coupled with valve‑actuator shaft rotates internal cam and position‑sensing element; mechanical cams trigger SPDT micro‑switches at pre‑defined opening‑angle thresholds; position‑sensing element drives internal transmitter circuit converting shaft‑angle into standardized 4‑20 mA current signal transmitted to remote control‑system for valve‑position monitoring.

Installation Requirements

Mount directly onto rotary valve‑actuator shaft using dedicated adapter kit; align coupling to avoid mechanical binding; tighten cable‑gland fittings to maintain enclosure environmental rating; set mechanical‑switch cam trigger‑points according to actual valve full‑open / full‑closed positions; calibrate 4‑20 mA zero‑point and full‑span after mechanical installation completion.

Usage Precautions

Verify hazardous‑area certification matches site classification for explosion‑risk locations; do not exceed shaft torque limits; prevent mechanical jamming between actuator‑shaft and feedback‑unit internal mechanism; perform zero‑span recalibration after mechanical disassembly; keep cable‑entry glands properly sealed against moisture and dust ingress.