— 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) |
Specifications sourced from the official Vartech product catalogue. Download above for the full datasheet.
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