DEIF VTR‑5‑NB Isolated True RMS Voltage Transducer, 0–500 VAC Input, 4–20 mA Output for Power Monitoring
DEIF VTR‑5‑NB Isolated True RMS Voltage Transducer, 0–500 VAC Input, 4–20 mA Output for Power Monitoring - Image 2
DEIF VTR‑5‑NB Isolated True RMS Voltage Transducer, 0–500 VAC Input, 4–20 mA Output for Power Monitoring - Image 3

DEIF VTR‑5‑NB Isolated True RMS Voltage Transducer, 0–500 VAC Input, 4–20 mA Output for Power Monitoring

  1. VTR‑5‑NB — 0–500VAC True RMS Voltage Transducer (Target Item)
  2. CTR‑5‑NB — AC Current Transducer, 0–5A input to 4–20mA output
  3. VTR‑2 — Compact Single‑phase Voltage Transducer
  4. CTR‑2 — Miniature Current Transducer for low‑range measurement
  5. VTR‑3 — Three‑phase voltage measuring transducer
  6. CTR‑3 — 3‑phase current transducer package
  7. VTR‑7 — High‑precision wide‑range voltage transducer
  8. CTR‑7 — High‑accuracy current transducer for power quality monitoring
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Description

DEIF VTR‑5‑NB Isolated True RMS Voltage Transducer, 0–500 VAC Input, 4–20 mA Output for Power Monitoring

 

Product Introduction

The DEIF VTR‑5‑NB is a compact DIN‑rail mounted true RMS voltage transducer developed for low‑voltage AC power system measurement. It converts 0–500 VAC primary voltage signal into standard isolated 4–20 mA analog output signal, accurately calculating RMS value even under distorted, non‑sinusoidal voltage waveforms commonly seen in variable‑frequency drive cabinets, generator output feeders and harmonic‑rich industrial power networks. Galvanic isolation between primary high‑voltage side and low‑current secondary side protects downstream PLC, DCS and SCADA analog input cards. As a widely used power measurement accessory, VTR‑5‑NB is frequently stocked as spare parts for power panels, MCC rooms and generator control retrofitting projects.

 

Specific Application Information

  • AC line voltage measurement: Measure single‑phase or 3‑phase line‑to‑line AC voltage up to 500 VAC.
  • VFD cabinet bus monitoring: Capture distorted voltage signals from frequency converter output side with true RMS algorithm.
  • Generator terminal voltage tracking: Continuous generator output voltage monitoring for gen‑set control systems.
  • MCC feeder voltage supervision: Collect voltage data of motor control centre outgoing feeders.
  • Analog signal conversion: Convert high‑voltage AC measurement into standard 4‑20mA signal for PLC / DCS acquisition.
  • Grid quality monitoring: Provide real‑time voltage value for power historian trend recording and over/under voltage alarming.
  • UPS & emergency power system monitoring: Voltage sampling for backup uninterruptible power supply output.

VTR-5-NB

Technical Parameters

Parameter Specification
Model VTR‑5‑NB
Manufacturer DEIF
Measurement Principle True RMS
Primary Input 0–500 VAC, 45–65 Hz
Secondary Output Isolated 4–20 mA DC, proportional to full‑scale voltage
Power Supply 24 V DC (operating range:18–36 V DC)
Basic Accuracy ±0.5% FS at rated condition
Isolation Galvanic isolation between input, output and auxiliary power circuits
Mounting Standard 35 mm DIN rail installation
Operating Temperature -20°C ~ +60°C
Relative Humidity 0–95%, non‑condensing
Housing Flame‑retardant plastic enclosure for panel mounting
Dimensions Slim compact form factor for dense control cabinet layout

 

Main Features

✅ True RMS calculation: Delivers precise voltage reading for distorted waveforms with harmonics, superior to simple average‑sensing transducers. ✅ Wide 0–500 VAC input range: Covers most global low‑voltage three‑phase industrial distribution systems. ✅ Galvanic multi‑way isolation: Blocks high voltage surges and eliminates ground‑loop interference between power circuit and control I/O. ✅ Industry‑standard 4–20mA output: Directly compatible with mainstream PLC, DCS, RTU and SCADA analog input channels. ✅ DIN‑rail slim design: Quick clip‑on mounting inside MCC panels, generator control cabinets and switchgear auxiliary compartments. ✅ Wide frequency tolerance: Stable measurement for 45–65 Hz, fits both 50Hz and 60Hz power grids. ✅ Low power consumption: Minimal load to the 24V DC control power supply of the cabinet. ✅ Maintenance‑free solid‑state circuit: No moving components for long‑term continuous 24/7 operation.

 

Application Scenarios

  1. Generator Control Panels: Generator terminal voltage monitoring for marine & land‑based gen‑sets.
  2. MCC Motor Control Centres: Feeder voltage monitoring for large pump, fan and conveyor motor circuits.
  3. Variable‑Frequency Drive Rooms: VFD input / output voltage measurement with heavy harmonic distortion.
  4. UPS & Emergency Power Systems: Backup power output voltage supervision.
  5. Industrial Distribution Panels: Plant low‑voltage main incoming and outgoing feeder monitoring.
  6. Marine Electrical Systems: On‑board ship power network voltage measurement.
  7. Renewable Energy Auxiliary Cabinets: Inverter AC side voltage sampling.

 

Supporting Components

  • 24V DC auxiliary power supply module inside control cabinet
  • PLC / DCS analog input module (4‑20mA channel)
  • Shielded twisted‑pair signal cable for 4–20mA output wiring
  • Circuit breaker or fuse protection for primary 500VAC input side
  • DIN rail and cabinet mounting accessories
  • Terminal blocks for high‑voltage primary wiring
  • SCADA / HMI system for voltage value display and alarm configuration

 

Related Series Models (DEIF Voltage & Current Transducer Family, 8 Models)

  1. VTR‑5‑NB — 0–500VAC True RMS Voltage Transducer (Target Item)
  2. CTR‑5‑NB — AC Current Transducer, 0–5A input to 4–20mA output
  3. VTR‑2 — Compact Single‑phase Voltage Transducer
  4. CTR‑2 — Miniature Current Transducer for low‑range measurement
  5. VTR‑3 — Three‑phase voltage measuring transducer
  6. CTR‑3 — 3‑phase current transducer package
  7. VTR‑7 — High‑precision wide‑range voltage transducer
  8. CTR‑7 — High‑accuracy current transducer for power quality monitoring

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