M850-LCD AC Meter

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Product Description

This Multi-function panel meter has a large 3.75″ X 3.75″ screen with easy to read numbers on the user selectable screen color (Blue, White, Green).

The M850-LCD meter offers the following features

  • Complete 1-phase and 3-phase digital universal metering system
  • Measures a standard range of 19 different parameters
  • Continuous display of kW.h or kVAr.h
  • THD option for Current and Voltage
  • Four easy to access front control buttons to scroll up or down through the parameters
  • Unique LCD FSTN display with customer selectable back lighting with user-selectable color options of blue, green or white
  • MODBUS RTU and BACnet MS/TP communications protocols for use with PC, PLC, RTU, Data Loggers and SCADA programs
  • Communicate with up to 32 other meters or controllers on 2-wire bus
  • UL listed
  • Non-volatile eeprom memory retains all current ratios, demand time periods, and calibration data in power down (power loss) conditions
  • Auxiliary power supply is a universal supply for both AC and DC volts
  • Fast response times: Display, less than 50ms; RS485 (Modbus), less than 10ms
  • Free software for monitoring and logging

Also see the M850-LCD DC meter on our site.

Electical Specifications

SYSTEM TYPES

  • Single Phase
  • Single Phase 3-Wire
  • 3-Phase 4-Wire Balanced
  • 3-Phase 3-Wire Unbalanced
  • 3-Phase 4-Wire Balanced
  • 3-Phase 4-Wire Unbalanced

INPUTS

  • Voltage
    • 28V to 347V,AC (L-N)
    • 48V to 600V,AC (L-L)
  • Overload
    • 800V,AC continuous
  • Burden
    • 0.5VA per phase
  • Current Input
    • Via CT: 5A; 1A,AC
    • CT Option: 0.5 to 6A,AC;
    • 0.1 to 1.2A
  • Input Overload
    • 10 x In for 1 sec.
  • Input Burden
    • 0.5VA per phase
  • Frequency
    • 45-65Hz (Optional 360-440Hz)
  • Input Working Range
    • V&I from 1.7% to 100%

ACCURACY

  • Volts/Amps
    • 0.5% of reading ± 2 digits
  • Frequency
    • 0.1Hz ± 1 digit
  • Active Power
    • 1% of reading ± 2 digits
  • Reactive Power
    • 1% of reading ± 2 digits
  • Apparent Power
    • 1% of reading ± 2 digits
  • Power Factor
    • 1% of range
  • Energy
    • IEC 1036, Class I

AUXILIARY VOLTAGE

  • 100 to 440V,AC; 100 to 420V,DC (Optional 19 to 69V,DC)
    45-65Hz, Burden <10VA

INSULATION

  • Insulation Category
    • III (480V,AC L-L)
  • Degree of Pollution
    • 2
  • Rated Impulse
    • IEC 60947-1-V
  • Withstand Voltage
    • imp:4kV
  • Meters, Front
    • Class II
  • Electrical Security
    • IEC 61010-1

ELECTROMAGNETIC COMPATIBILITY

Immunity to:

  • Electrostatic Discharges (ESD)
    • IEC 61000-4-2-Level III
  • Radiated Radio-Hz Fields
    • IEC 61000-4-3-Level III
  • Electrical Fast Transient/Bursts
    • IEC 61000-4-4-Level III
  • Impulse Waves
    • IEC 61000-4-5-Level III
  • Conducted Disturbances
    • IEC 61000-4-6-Level III
  • Voltage Dips & Short Interruptions
    • IEC 61000-4-11-Level III

Emissions to:

  • Conducted and Radiated
    • CISPR11-Class A

Additional information

Model Number

M850LCD (Standard AC Multipower Unit), M850THD (Added THD Options, Measures Voltage and Current Inputs)

Input Amperage Options

5A (Standard), 1A (Custom)

Frequency

50-60Hz (Standard), 400Hz (Custom)

Communication

Pulsed Output (Standard), Pulsed Output and RS-485 (Modbus) (Custom)