MS 7221 V/mA Calibrator

About This Instrument

The Vartech MS 7221 is a precision V/mA Calibrator built for instrumentation engineers and process control professionals who calibrate transmitters, PLCs, control loops and process equipment on the industry-standard 4–20 mA signal. With both source and measure capability, ±0.015% DC mA accuracy, 1 µA resolution and a built-in 24 V loop supply that simultaneously powers the transmitter and measures its output — it replaces multiple instruments and eliminates uncertainty from your calibration chain.

Key Features

• Source and measure in one instrument — output a precisely known current or voltage signal to calibrate a receiver, or measure the output of a transmitter under test; two functions, one instrument
• ±0.015% DC mA accuracy with 1 µA resolution — exceeds the accuracy requirement of most industrial 4–20 mA transmitters and control systems; a traceable calibration tool, not just a test meter
• 24 V loop supply with simultaneous current measurement — power a 2-wire transmitter and measure its 4–20 mA output at the same time, with no external power supply needed; the complete calibration setup in one box
• Source or simulate 4–20 mA loop current — calibrate, test or simulate any 4–20 mA process transmitter, positioner, I/P converter or control valve actuator directly from the meter
• Measure voltage output signals from PLCs and transmitters up to 10 V — verify 0–10 V and 0–5 V analogue outputs without a separate voltmeter
• ±0.02% DCV accuracy across 0–100 mV and 0–10 V ranges — precise enough for transducer and sensor signal verification
• 4½ digit display with high stability design — consistent, repeatable readings across temperature and over time

Technical Specifications

Specifications are sourced from the official Vartech product catalogue. Download the catalogue above for the full datasheet.