UMT 1 Series

Woodward Measuring Transducers with RMS Sensing

Woodward’s UMT 1 Series consists of measuring transducers that feature true RMS sensing. Measured values are calculated and displayed on a two-line, 16-character LC Display. They can either be assigned to analog outputs (configurable as -20 to 20 mA, 0 to 20 mA, or 4 to 20 mA) or transmitted to a higher-level control system via RS-485 or Profibus DP interface.

The primary measured values of voltage and current are used to calculate the values for active, re-active, apparent power, power factor (cosphi), kWh and kvarh. An impulse output is also provided to output kWh or kVarh values.

Features include:

True RMS sensing
Class 0.5 accuracy
RS-485 Modbus RTU Slave or Profibus DP communication
Configurable measuring system for either single-phase, three-phase, or a combination of both
Front panel configurable

Packages

The UMT 1 Series is available with different feature packages. The following table shows the differences between these packages.

	UMT 1 Series
Model	UMT 1	UMT 1	UMT 1	UMT 1
Package	A3	A3SU	A3SU	A6
Analog outputs	3	3	3	6
RS-485 (Modbus)	---	●	---	---
Profibus DP	---	---	●	---

Specifications

Power supply	24Vdc (8 to 30 Vdc)
Consumption	max. 10W
Ambient temperature (operation)	-20 to 70 °C / -4 to 158 °F
Ambient humidity	95 %, non-condensing
Voltage AC input	115Vac or 400Vac true RMS
Accuracy	Class 0.5
Current AC input	1A or 5A true RMS
Accuracy Iac	Class 0.5
Analog outputs (isolated)	-20/0/4 to 20 mA
Housing
Front panel mounting	Plastic housing
Dimension (WxHxD)	96 × 72 × 130 mm
Sealing (front/back)	IP42/IP21
Weight	Approx. 800 g