— Vartech® Calibrators
V 7221 B Loop Calibrator
5-digit source & measure loop calibrator — source 0–30 mA DC, measure ±35 mA / ±35 V DC, with Sawtooth/Triangle wave, torch and backlight.
Authorised Dealer - Genuine Vartech product
- Expert technical support
- Pan-India delivery
- Competitive pricing
About This Instrument
The Vartech V 7221 B is a professional 5-digit source-and-measure loop calibrator for 4–20 mA process control loops. It sources DC current from 0 to 30 mA and simultaneously measures DC mA (±35 mA) and DCV (±35 V). In addition to DC step output, the instrument generates Sawtooth and Triangle wave signals useful for valve stroke testing and transmitter simulation. On/Off detection, Span mode, torch and backlight functions make it well suited for field commissioning and calibration work. Built-in input protection includes a 100 mA / 250 V fast fuse. Input common-mode rejection is better than 120 dB (50/60 Hz) and serial-mode rejection better than 60 dB.
Key Features
- Source DC Current: 0–30 mA
- Measure DC mA: ±35 mA | Measure DCV: ±35 V
- Sawtooth / Triangle wave output for valve and transmitter testing
- Span mode
- 5-digit display with backlight | Display refresh: 2–3 times/s
- Maximum input voltage: 60 Vpk | Maximum input current: 50 mA
- Input protection: 100 mA / 250 V Fast Fuse
- On/Off detection | Torch function | Auto Power Off
Technical Specifications
| Function | Source & Measure (bidirectional) |
| DC Current Source | 0–30 mA |
| DC mA Measurement | ±35 mA |
| DCV Measurement | ±35 V |
| Waveform Output | Sawtooth / Triangle wave |
| Display | 5 digits with backlight | Refresh rate: 2–3 times/s |
| Maximum Input Voltage | 60 Vpk |
| Maximum Input Current | 50 mA |
| Input Protection | 100 mA / 250 V Fast Fuse |
| Input CMR (50/60 Hz) | > 120 dB |
| Input SMR (50/60 Hz) | > 60 dB |
| RJC (Cold Junction) Range | -10 °C to 50 °C | Accuracy: ±0.5 °C at 18–28 °C; ±1 °C elsewhere |
| Cold End Compensation | 10 s / cycle |
| Temperature Coefficient | 0.1 × basic accuracy / °C (outside 18–28 °C range) |
| On/Off Detection | Yes |
| Auto Power Off | Yes |
Specifications sourced from the official Vartech product catalogue. Download above for the full datasheet.
Interested in the Vartech V 7221 B? Get a quote today.
Email us with your model, quantity and application — we respond within one business day.