The Fluke BT521 is part of the Fluke 500 series designed for testing stationary batteries and battery banks in industrial and backup applications.
This device utilizes the Smart Probe (BTL21) to automatically measure temperature and store voltage and resistance values along with temperature.
The “Sequence” measurement mode allows for continuous measurements across battery cells or branches without the need to press the save button for each cell.
Measured values are automatically recorded and can be reviewed on the device before transferring to a computer.
This analyzer features a rugged design, with IP40 level protection and a safety rating of CAT III 600 V, making it suitable for use in industrial environments.
Its main distinguishing feature compared to lower models is its capability of temperature measurement (with infrared sensor) and the use of the Smart Probe.
🔹 Key Features of Fluke BT521
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High-accuracy internal battery resistance measurement
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Automatic recording of voltage, resistance, and temperature values
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Sequence mode for continuous testing
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Use of smart probe with display, temperature sensor, and audible alarm (only in model BT521)
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Simple user interface with step-by-step guidance
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Ability to compare measured values against specified thresholds
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Complete data logging with capability for transfer to computer for analysis and reporting
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Environmental resistance (IP40)
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High safety: CAT III 600 V rating
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Compact design suitable for field use
🔹 Technical Specifications of Fluke BT521
| Feature | Value |
|---|---|
| Model | BT521 |
| Battery/Internal Shunt Resistance | 3 mΩ / 30 mΩ / 300 mΩ / 3000 mΩ |
| Resistance Accuracy | Ranges: 1 % + 8, 0.8 % + 6 |
| DC Voltage | 6 V / 60 V / 600 V |
| DC Voltage Accuracy | 0.09 % + 5 |
| AC Voltage (45–500 Hz) | Up to 600 V |
| AC Voltage Accuracy | 2 % + 10 |
| AC Voltage Ripple | 600 mV and 6000 mV |
| DC Current / AC Current (with i410 clamp) | Up to 400 A |
| Frequency | Up to 500 Hz |
| Temperature | 0 to 60 °C |
| Data Logging Mode | Meter Mode: 999 records / Sequence Mode: up to 100 profiles with 450 batteries |
| Operating Temperature | 0 to 40 °C |
| Storage Temperature | -20 to +50 °C |
| Power Source | Internal lithium battery 7.4 V / 3000 mAh |
| Communication Interface | USB mini |
| Dimensions | 22 × 10.3 × 5.8 cm |
| Weight | ≈ 850 grams |
| Safety Class | CAT III 600 V |
| Environmental Protection | IP40 |
❓ Frequently Asked Questions (FAQ)
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