TRINITY make Electrical Power Meter SLM-Pro

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Products Code : SLM PRO

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  • Class 0.5s accuracy for Active energy as per the IS14697
  • 4 digits X 3 rows bright 7-Segment display
  • Compact 96 X 96 DIN Enclosure
  • Computed Neutral Current
  • Shows all three types of Power Factors – True, Displacement and Distortion
  • Harmonic measurement: All six waveforms up to 30th order, even and odd, including THD
  • Event logging of Sags, Swells and Interruptions as per IEC 61000-4-30
  • Demand Measurement: Fixed or Sliding for KW, KVA, KVAR and Avg-Amps
  • RUN Hour and ON Hour measurement
  • Energy Pulse Output LED on the front – selectable for Real/Apparent/Reactive Energy
  • 3P4W, 3P3W and 1P2W connections
  • Import – Export counters for all three energies and all Power Demands
  • User selectable CT and PT Ratios. 5A or 1A operation, eld selectable


Trinity introduces the SLM PRO, an easy-to-use, accurate and very versatile electrical power meter with innovative features, which is ideal for remote monitoring of electrical installations, Energy accounting and management, tenant billing and Power quality analysis.


The meter has three LEDs in the front, one to calibrate energies, one to indicate the status of RS485 communication and one to indicate conversion from kilo to mega. The display consists of three rows of four-digit seven segment red LEDs of 0.56 inches. Twenty-four LEDs in two columns on either side of the display indicate the various parameters being shown.


It supports MODBUS-RTU protocol over RS485 port.


Installation & Connection:

The CT Primary and Secondary, PT Ratio and installation types are site selectable, thus making it possible to use the meter in all types of installations like 3P4W, 3P3W and 1P2W.


Comprehensive Measurement:

In addition to basic metering of the previous models, SLM PRO adds support for Import-Export measurement on three energies and demands, logging of minimum-maximum values, all three types of power factors like True, Displacement and Distortion , Phase angle measurements, unbalance percentages and computed neutral current.


Power Quality Analysis as per IEC 61000-4-30 & IEC 61557-12:

For Power Quality Analysis - SLM PRO measures individual harmonics for all voltage and current waveforms, both even and odd, up to the 30th order, with THD as per IEC 61557-12. It also records in its non-volatile memory with date and time stamp, twenty Interruption events and thirty SAG/SWELL events, as per IEC 61000-4-30 standard



Technical Specifications:












3P4W, 3P3W, 1P2W


Direct Voltage Input: up to 500V (L-L), 300V (L-N)

PT Ratio: Site Selectable

Burden: 0.5VA


Secondary Current Input: 5A or 1A (Site Selectable)

CT Primary: Site Selectable

Range of Reading: up to 5000A

Burden: < 1.0VA

Overload: 5A CT-6A RMS continuous & 1A CT-1.2A RMS continuous

Power Supply

Aux. supply – 60-480V AC/DC, 50-60Hz













Volt (L-L), Volt (L-N)

Accuracy: 0.5% of reading

Amps (RYB)

Accuracy: 0.25% of reading


45-55Hz, accuracy: 0.05% of reading




Active Power (P)

Accuracy: 0.5% of reading (for IPFI > 0.5)

Reactive Power (Q)

Accuracy: 1.0% of reading

Apparent Power (S)

Accuracy: 0.5% of reading

Power Factor

For individual phases & system PF

Accuracy: 0.5% of reading (for IPFI > 0.5)

Range of Reading: 0.05 to 1.00 (Lag/Lead)




Active Energy KWh

Range of Reading: 0 to 999999999.9

Accuracy: Class 0.5s

Apparent Energy KVAh

Range of Reading: 0 to 999999999.9

Accuracy: 0.5% of reading

Reactive Energy KVARh

Range of Reading: 0 to 999999999.9

Accuracy: 1.0% of reading

Power Quality

THD & individual harmonics for each phase V & A

Class 5.0 up to 30th order






KW, KVA, KVAR & Avg. Amps


15 mins or 30 mins selectable


Fixed or Sliding selectable


Present, Predictable, Maximum Demand & Last Maximum Demand

Import & Export (For power parameters only)











Panel cut-out




4x3, 7 segment, Red

Operating Temperature

0 to 550C


310 grams

Operating Current Range

0.4% to 120% of CT Primary


RS485 Port

MODBUS RTU Protocol: 2 wires, 9600, 19200, 38400 Baud

Parity: None, Stop Bit-1, Isolation: 2.5VA RMS


Display Update


1 S


1 S


3 S



3 keys for navigation & programming of various parameters


Calibration LED

Red colour: 1000 impulses per unit

Import/Export of KWh/KVAh/KVARh


Communication LED

Dual coloured LED

Data Receive – Green LED

Data Transmit – Red LED

*0.5s accuracy applicable only in 3P4W mode.

Note: some parameters are available only on RS485. So please refer to the user manual for more details.

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