Overview
The Yokogawa 251409FAZZ is a high-performance analog DC ammeter designed for direct measurement of low-level direct current in industrial automation, process control, and laboratory applications. Rated at 0-1 mA, this panel meter delivers ±2% accuracy of full-scale measurement, meeting ANSI C-39.1 standards for precision instrumentation. The moving coil mechanism provides stable, responsive current measurement suitable for sensitive control circuits and diagnostic applications.
Key Features
- Complies with ANSI Specification C-39.1 for standardized accuracy and performance
- DC ammeter overload rating: 10 times the rated current for 10 consecutive intervals of 0.5 seconds with 1 minute interval between applications; 20% sustained overload for six hours
- Maximum 40% overshoot characteristic for controlled needle response
- Direct measurement requires only series connection—no external shunts or burden resistors in standard configurations
- Industrial-grade construction designed for reliability in control cabinet environments
- Dust resistant construction with gasketed design to seal out dust and air-suspended damaging particles
Technical Specifications
- Measurement Range: 0–1 mA DC
- Accuracy Class: ±2% of full scale
- Type: Moving coil (moving magnet) DC ammeter
- Suspension: Pivot and jewel or taut band (model dependent)
- Operating Principle: Direct current measurement via series connection
- Response Time: 2 seconds maximum for DC ratings
- Scale Length: Varies by case size (1.40″ to 3.93″ depending on model variant)
- Overshoot: Maximum 40%
- Insulation Level: 2600 Vrms Hi-pot (except 1.5″ models: 1500 Vrms)
- Standards: ANSI C-39.1 compliant
- Manufacturer: Yokogawa (Japan)
Typical Applications
- Low-current DC circuit monitoring and diagnostics in industrial control systems
- Battery charge/discharge monitoring and management circuits
- Precision laboratory measurements of milliampere-range currents
- Signal conditioning feedback loops requiring visual current indication
- Control panel instrumentation for process automation equipment
- Test and commissioning of sensitive electronic circuits
Compatibility & Replacements
Compatible With
- DC circuits rated 0–1 mA (direct series connection)
- Industrial control systems requiring analog meter feedback
- Standard panel cutout sizes (depends on meter case size)
- Power supplies and battery management systems with milliampere monitoring needs
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator or equipment designer before ordering. Similar Yokogawa DC ammeter models in the 0-1 mA range may have equivalent specifications but require confirmation of mounting footprint and case configuration.
Works With
- Direct DC measurement without external signal conditioning required
- Compatible with standard control panel layouts and DIN rail systems via appropriate mounting hardware
- No software or protocol dependencies—analog meter operates independently
- Suitable for use alongside digital multimeters and data logging systems for verification and redundancy
