Clamp-type analog ammeter/power meter BLOW 51-507 — mini, 7.5 A, side clamp

BLOW 51-507 is a compact analog clamp-type ammeter and power meter designed to measure alternating current up to 7.5 A. The mini instrument features a side-opening clamp that enables quick non-contact current measurement on single conductors and an analog dial that provides continuous, real-time readings. Its compact size and simple mechanical design make it suitable for basic electrical troubleshooting, inspection of control panels, and portable field measurements where low-current monitoring and simple power indication are required.

Advantages

The side-opening clamp simplifies access to conductors in tight installations without disconnecting cables. The analog needle display allows immediate trend observation and easy interpretation of fluctuating currents. Small form factor and relatively low weight make the device convenient to carry and position in confined spaces. Mechanical construction requires no complex configuration, which reduces setup time for routine checks.

Suitable for

• Quick checks of AC current on single conductors in residential or light commercial systems
• Basic troubleshooting and verification during maintenance of motors, small appliances, and control circuits
• Panel spot checks and portable field measurements where compact instruments are preferred
• Simple power indication tasks that require visual current monitoring rather than precise digital logging

Key specifications

• Measurement type: AC current with clamp-on sensor
• Maximum current range: up to 7.5 A
• Display: analog needle dial for real-time reading
• Clamp design: side-opening jaw for single-conductor access
• Form factor: mini, portable housing suitable for confined spaces
• Application environment: field use and panel inspections in low-current systems

How to use

Place the ammeter near the conductor to be tested, open the side clamp and position it around a single live or neutral conductor only; do not clamp around multi-conductor cables or entire cable bundles. Close the clamp fully to ensure proper alignment of the sensing jaws, then read the current from the analog dial. For power indication, interpret the current together with knowledge of system voltage and load characteristics; the instrument provides direct current monitoring rather than calculated power values. Store the device in a protective case when not in use to protect the mechanical parts and the dial.

Usage recommendations

Use the instrument only within the specified current range and on AC circuits. Avoid clamping around conductors with insulation damage or exposed live parts. For measurements on multi-conductor cables or for precise power calculations, use appropriate instruments designed for those tasks. Periodically check the mechanical condition of the clamp and the readability of the dial; calibrate or service the device according to local metrology requirements if accurate measurements are essential.