UPM309 Multi-function Three-phase Electrical Network Analyzer (RS485 or Ethernet)




  • Energy audit.
  • Monitoring system and energy control.
  • Individual machine load monitoring.
  • Power peak control.
  • Switchboards, gensets, motor control centers, etc.
  • Remote metering and cost allocation.

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The Sensor measures: AC Current
Output Signal: RS485 or Ethernet
Power Supply: from the AC network
Sensor IP Rating IP54 (front panel); IP20 (terminals)
  • DIN 96x96 ultra compact version, only 39 mm depth
  • Fully bi-directional four quadrants measurements for all energies and powers
  • Main electrical parameters measured and displayed for a cost-effective consumption analysis
  • Version for 1 or 5A CT and for direct connection up to 6A
  • Possibility to connect by PT
  • Up to 8 MB for data recording (ENH version)
  • Possibility to record all energy counters (ENH version)
  • Up to 24 parameters selectable among real time measurements for MIN/AVG/MAX recording (ENH version)
  • MODBUS RTU/ASCII communication by RS485 port or MODBUS TCP communication by Ethernet port
  • Possibility to manage the instrument in remote mode by WintoolNET software or by Web server interface
  • 2 digital outputs, 1 digital input, 1 analog output (optional)

Power supply
Voltage range (according to the model): Instrument with RS485 port: 230 VAC ±15% or 115 VAC ±15% on request
Instrument with Ethernet port: 85...265 VAC
Frequency: 50/60 Hz

Voltage inputs

Maximum measurable voltage: 600 VAC max L-L
Minimum voltage for FFT calculation: 20/35 VAC (multiplied by PT ratio in case of PT use) with direct connection
Input impedance: ›1.3 MOhm
Frequency: 45 - 65 Hz

Current inputs

Maximum value: 7 A
Starting current (Ist): 2 mA
CT burden: max 0.15 VA per phase
Minimum current for FFT calculation: 100 mA * CT ratio

Typical accuracy
Voltage: ±0.2% reading in 10% FS...FS range (FS=Full Scale value)
Current: ±0.4% reading in 5% FS...FS range
Power: ±0.5% reading ±0.1% FS (PF=1)
Frequency: ±0.1% reading ±1 digit in 45...65 Hz range
Active energy: Class 1 according to IEC/EN 62053-21
Reactive energy: Class 2 according to IEC/EN 62053-23

Display & keyboard 
Display: Backlighted LCD, 78x61 mm
3 rows, 4 digits + symbols
Keyboard: 4 front buttons

Communication ports
Type: RS485 optoisolated or Ethernet
Protocols: MODBUS RTU/ASCII in case of RS485 port
HTTP, NTP, DHCP, MODBUS TCP in case of Ethernet port
Baud rate: 300 a 57600 bps in case of RS485 port
10/100 Mbps in case of Ethernet port

Type: NPN or PNP, passive optoisolated
Maximum values (according to IEC/EN 62053-31): 27 VDC - 27 mA
Energy pulse length (only for DO in pulse mode): 50 ±2ms ON time
Max output reaction time (only for DO in alarm mode): 1 s

Type: Active optoisolated
Selectable ranges: 0...20 / 4...20 mADC
Maximum load: 500 Ω

Type: Optoisolated
Voltage range: 80 ... 265 VCA-CC

Wire diameter for terminals 
Measuring terminals (A&V): 2.5 mm2 / 14 AWG
Terminals for I/O, AUX, RS485 port: 1.5 mm2 / 16 AWG

Size & weight 
LxHxP, W: 96x96x39 mm, max 310 g

Environmental conditions
Operating temperature: -25°C ... +55°C (3K6)
Storage temperature: -25°C ... +75°C (2K3)
Max humidity (without condensation): 80%
Sinusoidal vibration amplitude: 50 Hz ±0.075 mm
Protection degree - frontal part: IP54 (granted only in case of installation in a cabinet with at least IP54 protection degree)
Protection degree - terminals: IP20
Pollution degree: 2
Installation and use: Internal

Standard compliance (for the parts applicable for instrument)
Directives: 2006/95/EC, 2004/108/EC
Safety: EN 61010-1, EN 61010-2-030
EMC: EN 61326-1, EN 55011, EN 61000-4-2, EN61000-4-3, EN61000-4-4,
EN61000-4-5, EN61000-4-6, EN61000-4-11, EN61000-6-2


Analyze your needs based on the following parameters, choose the product which suits your needs and ask for an offer!

  • Do you need the harmonic analysis (FFT) or just THD?
  • Do you need Ethernet communication or ModbusRS485?
  • Do you need to log only power values or more parameters?
  • Do you need a device with standard I / O or with analog output too?

Basic ENH
(make one choice only)
115 VAC ±15% (only for instrument with RS485 port)
230 VAC ±15% (only for instrument with RS485 port)
85...265 VAC (only for instrument with Ethernet port)
(make one choice only)
RS485 for MODBUS RTU/ASCII communication
Ethernet for HTTP, MODBUS TCP communication
Web server (only for instrument with Ethernet port)
(make one choice only)
Sign bit
2’s complement
2 DIGITAL OUTPUTS For alarm events or pulse emissions
ANALOG OUTPUT (only for instrument with RS485 port) 0...20 / 4...20 mADC, programmable
DIGITAL INPUT To synchronise the DMD value calculation
DMD VALUE CALCULATION MODE Digital input synchronisation or Fixed window
Digital input synchronisation, Fixed or Sliding window
8 MB
RECORDINGS Active and reactive power AVG values
Real time params MIN/AVG/MAX values (up to 24 params programmable)
Energy counters
WIRING MODES Three phase, 4 wires, 3 currents (3.4.3)
Three phase, 3 wires, 2 currents (3.3.2)
Single phase (1ph)
THD & HARMONICS Voltage and current THD values
Voltage and current harmonics up to 15th
(make one choice only)
Total counters
Separated Inductive&Capacitive counters

= standard
= optional

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