— Vartech® Calibrators

MS 7221 V/mA Process Signal Calibrator

4½-digit V/mA calibrator — source and measure 0–24 mA DC loop current and 0–10 V DC, with 0.015% mA accuracy and 24 V loop supply.

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About This Instrument

The Vartech MS 7221 is a high-accuracy 4½-digit V/mA process signal calibrator designed for calibrating and testing 4–20 mA current loop transmitters, PLCs and process control equipment. It sources and measures DC loop current from 0 to 24 mA with a very high accuracy of ±(0.015% + 4 digits) and 1 µA resolution, and handles DC voltage from 0 to 100 mV or 0 to 10 V with ±(0.02% + 2 digits) accuracy. The built-in 24 V loop supply enables simultaneous powering and current measurement of 2-wire transmitters — eliminating the need for an external power source during calibration. The MS 7221 provides exceptional stability and is suitable for instrumentation workshops, field calibration and process plant maintenance.

Key Features

Source & Measure DC loop current: 0–24 mA | Accuracy: ±(0.015% + 4 digits) | Resolution: 1 µA
Source & Measure DCV: 0–100 mV and 0–10 V | Accuracy: ±(0.02% + 2 digits)
24 V built-in loop supply — power 2-wire transmitters while measuring loop current
4½-digit display
Measures voltage output signals from PLCs and transmitters
High stability and accuracy — Superior quality calibrator

Technical Specifications

DCV Measure	0–100 mV \| 0–10 V \| Accuracy: ±(0.02% + 2 digits)
DCV Source	0–100 mV \| 0–10 V \| Accuracy: ±(0.02% + 2 digits)
DC mA Measure (% of span)	0–24 mA \| Accuracy: ±(0.015% + 4 digits) \| Resolution: 1 µA
DC mA Source (% of span)	0–24 mA \| Accuracy: ±(0.015% + 4 digits)
Loop Supply	24 V DC (built-in) \| Simultaneous current measurement
Display	4½ digits
Power Supply	4 × AA batteries
Dimensions	194 × 93 × 55 mm
Weight	350 g (including battery)