Product Datasheet
UK
The 871-8308 is a new generation modern design
power monitor that will measure and display electri-
cal power quality parameters. It has been engineered
to cover most applications (Single Phase and Three
Phase networks / Built in Pulsed and RS485 Modbus /
Import and Export kWh), replacing the need for sever-
al different models of this power meter.
• MID B+D Certified
• Certificate Number 0120/SGS0177
• Class B (kWh) EC Directive 2004/22/EC
• Certified for Single & Three Phase
• Certified for Import / Export kWh
As the demand for MID certified meters has in
-
creased, we have obtained annex B and D of the EC
Directive 2004/22/EC. This power meter has been
tested and certified for single or three phase networks
and import and export active energy (kWh).
The 871-8308 is produced to the highest quality and
utilizes the latest microprocessor and technology. It
has a blue backlit display and 16 different measuring
parameters. This includes a negative power reading
to indicate reversal of CT installation or connection.
With built in pulsed outputs and RS485 Modbus RTU
it is fully compatible for integration with BMS and
remote monitoring systems.
Parameters
• Phase to Phase Voltage (3p3w Supplies Only)
• Phase to Neutral Voltage
• Frequency
• Voltage Total Harmonic Distortion (THD)
• Current
• Neutral Current (Calculated - Modbus Only)
• Current Max Demand
• Current Total Harmonic (THD)
• kW
• kVA
• kVAr
• Power Max Demand
• Power Factor
• Import kWh
• Export kWh
• Import kVarh
• Export kVArh
Specifications
Measured Parameters
The unit can monitor and display the following
parameters of a single phase two wire (1p2w), three
phase three wire (3p3w) or three phase four wire
(3p4w) system.
Voltage and Current
• Phase to neutral voltages 100 to 289V a.c. (not for
3p3w supplies).
• Voltages between phases 173 to 500V a.c. (3p3w
supplies only).
• Percentage total voltage harmonic distortion
(THD%) for each phase to N ( not for 3p3w supplies).
• Percentage voltage THD% between phases (3p3w
supplies only).
• Current THD% for each phase
Power factor and Frequency and Max. Demand
• Frequency in Hz
• Instantaneous power:
• Power 0 to 3600 MW
• Reactive power 0 to 3600 MVAr
• Volt-amps 0 to 3600 MVA
• Maximum demanded power since last Demand
reset Power factor
• Maximum neutral demand current, since the last
Demand reset (for three phase supplies only)
Interfaces for External Monitoring
Three interfaces are provided:
• RS485 communication channel that can be pro
-
grammed for Modbus RTU protocol
• Relay output indicating real-time measured energy.
(configurable)
• Pulse output 3200imp/kW h (not configurable)
The Modbus configuration (baud rate etc.) and the
pulse relay output assignments (kW/kVArh, import/ex
-
port etc.) are configured through the set-up screens.
Pulse Output
Opto-coupler with potential free SPST-NO Contact
(Contact range 5-27VDC / Max current input: Imin
2mA and Imax 27mA DC).
The pulse output can be set to generate pulses to
represent kWh or kVArh.
Rate can be set to generate 1 pulse per:
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