- Manufacturer: Woodward
- Model Series: UMT1 (Universal Measuring Transducer)
- Part Number: 8444-1019
- Hardware Revision: F
- Function: Multi-functional measuring transducer for electrical power systems
- Input Voltage Range: Configurable up to 480V AC (Direct) or via Potential Transformers (PT)
- Input Current Range: 1A or 5A secondary Current Transformer (CT) inputs
- Measured Parameters: Voltage, Current, Frequency, Real Power (kW), Reactive Power (kVAR), and Power Factor (cos φ)
- Output Signals: Multiple programmable analog outputs (e.g., 0-20mA, 4-20mA, or 0-10V)
- Communication Interface: RS-485 serial port supporting Modbus RTU protocol
- Power Supply: Wide-range auxiliary power (typically 24V DC or 115/230V AC depending on specific sub-variant)
- Mounting: Standard 35mm DIN rail or surface mounting
- Accuracy Class: 0.5 for voltage and current; 1.0 for power measurements
The WOODWARD 8444-1019 serves as a high-precision bridge between primary electrical power circuits and industrial control systems, converting complex AC electrical signals into standardized linear analog or digital data. This Revision F hardware is specifically engineered for high-reliability applications in power generation and distribution, providing the essential feedback required for load sharing, generator protection, and remote telemetry. Its compact, ruggedized design ensures stable signal conversion even in environments with significant harmonic distortion or electromagnetic noise, making it a staple component for switchgear manufacturers and offshore energy platforms.
Differences from Similar Models
The 8444-1019 F is distinguished from the basic UMT1-A variants by its expanded “Universal” measurement capability, which allows a single unit to replace multiple dedicated transducers for volts, amps, and watts. While the older 8444-100 series offered limited analog output scaling, the Revision F hardware features enhanced digital filtering and more flexible software mapping for the output channels. Furthermore, unlike the 8444-1018 model which may be limited to specific frequency ranges, the 1019 variant is fully compatible with both 50Hz and 60Hz systems, offering better global utility for international maritime and industrial projects.
Operating Tips
To ensure the highest measurement accuracy, it is critical that the Current Transformer (CT) secondary leads are securely landed and never open-circuited while the primary circuit is energized, as this can lead to high-voltage spikes and hardware failure. When configuring the analog outputs, use the Woodward LeoPC software to match the transducer’s scaling precisely to the input range of your PLC or DCS to avoid offset errors. Additionally, for Modbus communication, ensure the RS-485 network is terminated with a 120-ohm resistor at the end of the run to prevent data reflections that can cause intermittent communication timeouts.
