Fluke 709 Loop Calibrator Battery

This loop calibrator is a handheld instrument for sourcing, simulating and measuring 4–20 mA process loops, including HART-enabled devices for on-site diagnostics. It is designed for technicians working in automation, electronics and mechanical maintenance who need a compact, portable tool to power loops, verify transmitter outputs and capture field data.

• ±0.01% accuracy for precise current verification and calibration
• 1 μA resolution enabling fine adjustment and tight tolerance checks
• Built-in 24V loop power for single-wire mA measurements
• Rechargeable NiMH power option supporting short-term field use
• Selectable 250 Ω resistor to Interface with HART transmitters
• Logging capacity of 9,800 records for extended diagnostic traces

• Suitable for commissioning and tuning 4–20 mA transmitters in plants
• Ideal for troubleshooting HART-enabled field instruments on site
• Used for validating loop integrity during preventive maintenance
• Can be used for recording process variables for control loop optimisation

It includes a HART modem that supports common universal and common practice commands to read tags, sensor PVs, long tags and perform DAC trims and zero/gain adjustments.

Recorded HART configurations and mA measurements can be uploaded via dedicated software to produce .csv or .txt files for further examination.

The instrument operates between −10 °C and +55 °C with 10–95% non‑condensing humidity for typical plant conditions.

The unit provides over-voltage protection to 240 VAC and overload current protection at approximately 28 mA DC to reduce risk from fault conditions.

AC72-1 alligator clips (2), TL75 test leads, soft case, 6 AAA batteries (installed), product manual, quick reference guide, safety information