SMC 144 PQ-S

SMC 144 is specially designed datalogger for remote monitoring of energy consumption and power quality parameters in submetering and smart metering applications. The DIN rail mountable display-less design with multiple communication options is suitable for a wide spectrum of automation tasks in modern buildings, remote supervison of the infrastructure and also the energy management. 

Its input, output and communication interface portfolio can be easily extended with additional IO extension modules for extra control capability. Currently a 10 MBit Ethernet, USB, M-Bus and wireless(ZigBee, WiFi) extension is available.

This compact instrument is an ideal and a cost-optimized source of data for any modern SCADA system with embedded support for Modbus protocol. It is also supported by the ENVIS application. It continually records all measured quantities and related system logs. Separately it also records periodic electricity meter readings (load profiles).

In complex systems the instrument can be well integrated with other instruments - namely with the PA 144 and SMD 118.


  1. Specifications
  3. Ordering
  4. Software
  5. Firmware options

SMC 144 is a fully featured power analyser: this type of instrument builds on its PA 144. It measures and stores number of aggregated values. It includes a multitude of additional functions such as the storage of min, avg and max values, archive of energy consumption per tariff, quadrant and phase (15 minuntes electricity meter readings), logs of state changes and many other information. All this archived information is stored and downloaded by the supervising software for processing.

Parameters and features

  • four independent voltage and current inputs (4x1p, 3p-wye, 3p-delta)
  • direct and indirect voltage measurement
  • through-hole or split-core/clamp-on current transformers
  • electricity meter supports 3 tariffs, single- and three-phase measurement in four quadrants
  • basic measurement interval 10/12 periods, 128 samples/period
  • datalogger with 512 Mb of flash memory for electricity meter readings, main archive, logs etc.
  • wide range of power supply options (U:75-510 VAC, 80-350 VDC, L:20-75 VDC, 24-48 VAC)
  • fully programmable digital output (relay or impulse)
  • standard embedded RS-485 interface
    • optional second RS 485 or 2 additional digital inputs
    • expansion module with Ethernet 10/100 Base-T
    • expansion module with M-Bus support
    • expansion module with USB
    • Expansion module with WiFi or ZigBee wireless
    • other custom expansion modules can be developed upon request

Typical wiring and mechanical dimensions

Typical connection schema for SMC 144 and its mechanical dimensions

Wiring example: Currents of 5A up to 600A are measured directly with clamp-on or wire-through probes, this special approach significantly reduces the total cost of installation.

Ordering codes for SMC 144

Mechanical parameters of various current probes 

Ordering codes for SMC 144

ENVIS application suite provides all features for basic instrument management (configuration, supervision, fw update). It also downloads and archives data from all the supported instruments. import/export, data analysis and advanced reporting of the records is also provided. ENVIS is available free of charge to be used with all our instruments.

Typick√° instalace aplikace ENVIS

ENVIS.Online system service can be used to implement complex power quality monitoring and/or energy efficienci control and monitoring systems. By using email,  SMS or SNMP all registered users and administrators can be warned upon exeptional situations, malfunction of supply or monitored instruments or it can be used to post periodical analysis/reports.

Additional plugin modules can also add special features or customizations to booth ENVIS and ENVIS.Online in a modular manner. 

Typical installation of ENVIS


Optional firmware modules

Voltage and power event cycle data logger module.
  • Ripple Control (Mains) Signals - RCS Module: for measurement, recording and analysis of a ripple control signal. Several formats of the telegram are also supported for decoding.
  • Voltage Events - VE Module: for recording and evaluation of voltage events (SMVQ & SMPQ does include this feature in its default configuration).
  • General Oscillograms - GO module: for detection and precise recording of various waveform distortions. This module records the so called oscillograms of voltages and currents in extended detail, capacity and trigger options into the flash memory.
  • Modbus Master - MM module: in supported instruments with memory it activates new option to record Modbus data from connected slave devices. It can work as a datalogger to NOVAR PFCs as well as to local sub-meters or other Modbus sensors.
  • See: other built-in meters and analysers, portable analysers and data loggers, ENVIS 1.1 for data analysis.