The digital universal measuring device PEM353 is used to record and display measured quantities of an electricity supply network, and make them available via the communication interface.
The range of measurements extends from voltages and currents to power and energy meters to measured quantities of the voltage quality, such as THD and the individual harmonics up to the 31st order.
The PEM353 is suitable for use in 2-, 3- and 4-wire systems and in their respective versions as TN, TT and IT systems. This allows monitoring single and polyphase systems.
With its standardised dimensions of 96 x 96 mm, the device is intended for front panel mounting.

• Modern indicating instrument for electrical quantities, e.g. as a replacement for analogue indicating instruments
• Power quality monitoring
• Limit value monitoring (setpoints) with alarm forwarding
• Measurement and monitoring of the N conductor
• Energy and power measurement, e.g. as part of energy data monitoring
Measurement of electrical quantities such as
––Phase voltages (individually + Σ) UL1, UL2, UL3 in V
––Line-to-line voltages (individually + Σ) UL1L2, UL2L3, UL3L1 in V
––Phase currents (individually + Σ) I1, I2, I3 in A
––Neutral current In (calculated) in A
I4 (measured, PEM353-N only) in A
––Residual current Ir (calculated, PEM353-N only) in A
––Frequency f in Hz
––Power per phase conductor (individually + Σ)
P in kW, Q in kvar, S in kVA
––Displacement factor (individually + Σ) cos (φ)
––Power factor (individually + Σ) λ
––Active and reactive energy import (individually + Σ) in kWh, kvarh
––Active and reactive energy export (individually + Σ) in kWh, kvarh
––Voltage phase angle (LN or LL, individually) in °
––Current phase angle (individually) in °
––Voltage unbalance in %
––Current unbalance in %
––Harmonic distortion (THD, TOHD, TEHD) for U and I
––k-factor for I
––Crest factor for I
––Total demand distortion (TDD) for I
2. Energy meters
• Accuracy class of the active energy acc. to IEC 62053-22: 0.5 S
• LED (pulse) for active or reactive energy
• 2 pulse outputs (PEM353-P only)
• Total phase and individual phase energy metering
––Import, export, net and total per active and reactive energy
––Total apparent energy
• Up to 4 pulse counters (e.g. gas, water, air, heat)
3. Times of Use for energy measurement
• Up to 8 tariffs
• Tariff switching via digital inputs or
• Tariff switching according to schedule, 2 schedules
• Total phase and individual phase energy metering per tariff
––Import and export per active and reactive energy
––Total apparent energy
• Peak demand of the total phase power (P, Q, S) per tariff
4. Energy meter log – 12 monthly values
• Total phase energy metering
––Import, export, net and total per active and reactive energy
––Apparent energy
• Total phase energy metering per tariff
––Import and export per active and reactive energy
––Total apparent energy
5. Load data for total phase power (P, Q, S) and currents
• Configurable sliding average values/averaging (demand)
• Demand forecasts of the next average value
• Peak demand log with timestamp
––Total phase power and currents (P, Q, S)
––Total phase power per tariff (P, Q, S)
6. Log for max. and min. values for 45 measured quantities with timestamp
7. Limit value monitoring by means of setpoints and alarm forwarding
• 9 parametrisable monitoring points (setpoints)
• 25 measured quantities to choose from
• Alerting via display and/or digital outputs (DO)
• Monitoring for limit value violation (over/under limit value)
• Hysteresis adjustable
8. Event log (SOE log)
• 100 entries with timestamp, resolution 1 ms
• Changes to setup, setpoints and DI/DO
• System messages
• Limit value violations
9. Load data log: daily and monthly values (PEM353-N only)
• Daily log
––60 days (2 months)
––Total phase energy per active, reactive and apparent energy
––Peak demands of total phase power (P, Q, S)
• Monthly log
––36 months (3 years)
––Total phase energy per active, reactive and apparent energy
––Monthly peak demands of total phase power with timestamp
(P, Q, S)
10. Data recorders (PEM353-N only)
• 5 recorders with up to 16 channels each
• Channel selection from 328 measured quantities
• Interval configurable: 60 s to 40 days
• Recording time e.g. 100 days at a 15-minute interval
11.Easy and convenient operation
––Large backlit graphic display
––Display password protection
––Standard display with 4 selectable measured quantities
12. Other functions
• Connection fault detection (frequency, voltage/current failure, wrong polarity of measuring current transformer, rotating field)
• Operating hours counter
13.Communication interface and protocols
• Galvanically isolated RS-485 interface (1,200 to 38,400 bit/s)
• LED for communication activities
• Modbus RTU protocol
• BACnet MS/TP
• DNP

PEM353 was designed in accordance with the following standards:
• DIN EN 62053-22 (VDE 0418 Part 3-22)
Electricity metering equipment (a.c.) - Particular requirements - Part 22: Static meters
for active energy (classes 0.2 S and 0.5 S) (IEC 62053);
• DIN EN 61557-12 (VDE 0413-12)
Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. –
Equipment for testing, measuring or monitoring of protective measures – Part 12:
Performance measuring and monitoring devices (PMD)
• DIN lEC 61554:2002-08
Panel mounted equipment – Electrical measuring instruments – Dimensions for panel
mounting (IEC 61554:1999)