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PM40 Digital Power Meter | Shihlin Electric Energy Monitoring

Intelligent PM40 digital power meter with real-time AC parameters, harmonics analysis, modbus RTU, and optional RS485/LoRa connectivity for industrial automation.

Intelligent Power Metering for Industrial Automation & Energy Efficiency

PM40 Series digital power meter delivers precise AC parameter monitoring, harmonics measurement, and modular communication options for seamless system integration in factory automation and energy management applications.

Digital Power Meter - Shihlin Electric Digital Power Meter PM40
  • Digital Power Meter - Shihlin Electric Digital Power Meter PM40

Digital Power Meter

PM-40

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PM40 Series Digital Power Meter

Intelligent power metering for real-time AC parameters and harmonics, with modular I/O expansion and RS485/LoRa connectivity for fast system integration.

Modbus-RTU RS485 (Optional) LoRa (Optional) THD & Demand 96×96 Panel

Key Measurements

  • ParametersI, V, Frequency, P/Q/S, PF, Energy (kWh/kvarh), Max Demand, 4-Quadrant Energy, THD
  • Wiring System3Φ4W (3CT) / 3Φ3W (2CT)
  • AccuracyI/V: ±0.5% · Frequency: ±0.1 Hz · Active Energy: Class 1 · Reactive Energy: Class 2

Electrical Input

  • Voltage Input (Ue)100 VAC / 400 VAC
  • Voltage Overload1.2×Ue continuous · 2×Ue for 1 min
  • Current Input (In)1 A / 5 A (CT)
  • Current Overload1.2×In continuous · 10×In for 5 s
  • CT/PT RatioCT: 1–9999 · PT: 1–9999

Communication

  • ProtocolModbus-RTU
  • InterfaceRS485 (Optional) or LoRa (Optional) — choose one
  • Baud Rate1200–38400 bps (configurable)
  • LoRa Band433 MHz (export band can be customized)
Deployment tip: RS485 for wired SCADA; LoRa when wiring is difficult and fast rollout matters.

Mechanical & Environment

  • Aux PowerAC/DC 85–265 V, 50/60 Hz
  • Power Consumption< 5 W
  • ProtectionFront: IP52 · Housing: IP20
  • Panel / Cutout96×96 mm / 91×91 mm
  • Display / KeysLarge segment LCD · 4 keys
  • Operating−10°C to +60°C · 5–95% RH (non-condensing) · ≤2000 m
  • InstallationSelf-locking panel mount (screw-free fixing)
  • Weight< 400 g

Model Options (PM40H vs PM40SV)

PM40H supports optional expansion I/O and communication modules; PM40SV focuses on core metering + display.
Item PM40H PM40SV
Core metering (I/V/F/P/Q/S, PF, Energy, Demand, THD) Standard Standard
DI (2-ch dry contact, opto-isolated) Optional Standard
DO (2-ch relay output) Optional Standard
AO (2 × 4–20 mA, ≤600Ω) Optional N/A
Pulse output (2-ch open-collector) Optional N/A
RS485 / LoRa communication Optional (Choose one) Standard
Optional I/O modules: DI/DO, AO, Pulse. Communication modules: RS485 or LoRa (select one).
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How can you achieve precise power measurement and energy cost control across your multi-phase manufacturing equipment without complex system retrofitting?

The PM40 Series digital power meter delivers Class 1 active energy accuracy with flexible 3-phase wiring configurations and optional modular I/O expansion—allowing seamless integration into your existing production lines. With 60+ years of OEM/ODM partnership experience, Shihlin Electric ensures your power metering solution scales with your manufacturing operations. Contact our technical team today to discuss customized metering solutions for your facility.

With modular I/O expansion capabilities and dual communication options—Modbus-RTU protocol via optional RS485 interface or LoRa wireless connectivity (433 MHz)—the PM40 enables fast system integration into existing SCADA networks and IoT-enabled energy management platforms. The 96×96 mm panel-mount design with large segment LCD display and 4-key interface provides intuitive local control, while the self-locking installation mechanism eliminates complex wiring. Backed by Shihlin Electric's 60+ years of OEM/ODM expertise and professional technical support, the PM40 Series delivers the reliability, precision, and connectivity your industrial operations demand for maximizing energy efficiency, reducing operational costs, and achieving sustainable manufacturing excellence.