The Senva EMX is a revenue-grade True RMS electrical energy meter (ANSI C12.20 Class 0.2, 0.2% meter accuracy) with BACnet MS/TP, Modbus RTU, and Modbus ASCII over 2-wire RS-485, a color OLED display, data logging, 2 pulse inputs, and 2 pulse outputs. It is self-powered from 1 to 3 phase service (90–600V), monitors loads from 0.25 to 6000A using any 0.333V CT or metering Rogowski coil, mounts on PR30 DIN rail, and is made in the USA by Senva, Inc. (Buy American Act, BABAA, ARRA, and TAA conformant).
Senva EMX Advanced True RMS Energy Meter
The Senva EMX is the most user-friendly, fastest-installing True RMS energy meter on the market. With the SenvaSync app and NFC, setup is possible even while the device is powered off. The EMX is line-powered from the monitored service — no additional power supply needed — and self-powers from 1 to 3 phase voltage, 90 to 600V. BACnet MS/TP, Modbus RTU, and Modbus ASCII over 2-wire RS-485 connect it to virtually any building automation network, while 2 pulse inputs let the EMX relay additional meters (water, gas, steam) to the connected network.
Ideal for retrofits, the EMX accepts any 0.333V CT or standard metering Rogowski coil with no time-consuming, bulky integrators. As a True RMS meter, it handles heavily distorted, harmonic-rich loads without losing accuracy — and at 0.2% meter accuracy it meets ANSI C12.20 Class 0.2 revenue-grade standards for billing-quality data.
Best For
- Energy management and performance contracting
- Tenant submetering and activity-based costing in commercial and industrial facilities
- Real-time power monitoring and load shedding
- Energy audits and temporary monitoring
- Distributed generation and data center energy sensing
Key Features
Revenue-Grade Accuracy
0.2% meter accuracy to ANSI C12.20 Class 0.2 standards with 1% system accuracy for V, A, kW, kVAR, and kVA — suitable for tenant billing and cost allocation.
SenvaSync NFC Setup
Configure from the SenvaSync app on iOS or Android over NFC — even while the meter is powered off. The fastest commissioning workflow in its class.
Universal CT Input
Accepts any 0.333V split-core CT or standard metering Rogowski coil with no bulky external integrators — ideal for retrofits with existing CTs.
Self-Powered, 90–600V
Line-powered from 1 to 3 phase service, 90VLN–600VLL. No separate control transformer or power supply to specify, wire, or fuse.
BACnet & Modbus on RS-485
BACnet MS/TP, Modbus RTU, and Modbus ASCII over 2-wire RS-485 at baud rates from 9600 to 115200 — drops onto virtually any BAS trunk.
Color OLED + Data Logging
Vibrant color OLED display with a data-rich interface, real-time logging, RTC, plus 2 pulse inputs and 2 pulse outputs (import & export energy).
Technical Specifications
Specifications verified against the Senva EMX datasheet, revision V2 (October 15, 2024), and the 2026 Senva Commerce Declaration.
| Power Supply Input | |
| Line / High Voltage | 90VLN–600VLL (+20%), 50/60 Hz, 1–3 phase, self-powered |
| Power Consumption | 4W typical |
| Communications – RS-485 | |
| Protocols | Modbus RTU, Modbus ASCII, BACnet MS/TP |
| Baud Rates | 9600, 19200, 38400, 57600, 76800, 115200 |
| RS-485 Loading | 1/4 unit load |
| Pulse Outputs (2) | |
| Dual Outputs | Import & export energy outputs |
| Type | Solid state dry contact, N.O. and N.C., 300mA max, 40Vac/dc |
| Pulse Scaling | 0.01, 0.1, 1, 10, 100, 1k Wh/pulse |
| Pulse Duration | 10, 25, 50, 100, 250, 500 ms |
| Pulse Inputs (2) | |
| Input Rating | 3.5 ± 0.5 VDC, short circuit current 10mA max |
| Pulse Length | Accepts pulses >10ms, rejects pulses <5ms |
| Service Types | |
| Configurations | 1Ph, 2Ph, 3Ph Wye (4-wire), 3Ph Delta (3-wire) |
| Voltages | 90VL-N through 600VL-L |
| Frequency | 45–65 Hz |
| Measurement Category | CAT III |
| Performance | |
| Meter Accuracy | 0.2% (ANSI C12.20 Class 0.2 standards) |
| System Accuracy | 1% for V, A, kW, kVAR, kVA |
| CT Compatibility | Any 0.333V CT or standard metering Rogowski coil (no integrator required) |
| Operating Environment | |
| Operating Temperature | -22 to 158°F (-30 to 70°C) |
| Storage Temperature | -40 to 158°F (-40 to 70°C) |
| Humidity | 0–95% non-condensing |
| Environmental Rating | IP20; front display IP40 |
| Enclosure | |
| Material | Polycarbonate/ABS |
| Dimensions | 3.55”H x 4.18”W x 2.26”D |
| DIN Rail Compatibility | PR30 (TS 35/F6) |
| Optional Industrial Enclosure | NEMA 4X / IP65, polycarbonate, 7.78”H x 7.78”W x 4.8”D (EMX-ENC) |
| Compliance | |
| Agency | UL Listed, cUL Listed, File E489498 |
| Standards | RoHS, CE (requires metal enclosure) |
| Trade Compliance | Made in USA – Buy American Act, BABAA, ARRA §1605, and TAA conformant (see declaration) |
Documentation
Senva EMX Series True RMS Energy Meter Datasheet- Senva EMX Installation Guide (covers EMX and EMX-L)
- Senva EMX BACnet Guide (154-0041)
- Senva EMX Modbus Guide (154-0040)
- Senva EMX Display Navigation Guide (154-0045)
- SenvaSync App Interface Guide (153-0066)
- Senva Commerce Declaration - BABAA, TAA, ARRA (2026)
- Motor Engineering Formulas Reference
- Electrical Wire Sizes Selection Guide
Related Senva Metering Products
The Ethernet version — BACnet IP and Modbus TCP/IP over 10/100 Base-T, same revenue-grade engine, display, and logging.
The simplified EMX — same RS-485 protocols and pulse outputs, without display, logging, or RTC.
Flexible 6000A-rated Rogowski coils for the EMX series in 9” (CT-F09), 15” (CT-F15), 24” (CT-F24), and 36” (CT-F36) circumferences.
Compact CVT-based alternative — fully low-voltage meter base with plug-and-play BACnet MS/TP and Modbus RTU.
Frequently Asked Questions
Is the Senva EMX a revenue-grade meter?
Yes. The EMX meets ANSI C12.20 Class 0.2 standards (0.2% meter accuracy), commonly referred to as ANSI revenue grade, making it suitable for tenant submetering and billing applications.
Does the EMX work with my existing CTs?
Yes. The EMX accepts any standard 0.333V output CT as well as standard metering Rogowski coils, with no external integrators required — a major advantage for retrofit projects.
Does the EMX need a separate power supply?
No. The EMX is self-powered from the monitored line voltage, accommodating 1 to 3 phase service from 90VLN to 600VLL.
What is the difference between the EMX, EMX-L, and EMX-IP?
All three share the same revenue-grade metering engine, terminals, and SenvaSync NFC setup. The EMX has the OLED display, RS-485 (BACnet MS/TP, Modbus RTU/ASCII), logging, RTC, and pulse outputs. The EMX-L is the simplified version: same RS-485 protocols and pulse outputs, but no display, logging, or RTC. The EMX-IP swaps RS-485 for Ethernet with BACnet IP and Modbus TCP/IP, keeps the display and logging, but has no pulse outputs.
Is the Senva EMX Buy American Act compliant?
Yes. The EMX series is manufactured in the USA by Senva in Beaverton, Oregon, and conforms to the Buy American Act, Build America Buy America Act (BABAA), ARRA Section 1605, and the Trade Agreements Act (TAA). The signed 2026 conformance declaration is available in the documentation section above.
Can the EMX be installed outdoors or in washdown areas?
The meter itself is rated IP20 (IP40 front display) for panel or interior mounting. For harsh or outdoor locations, the optional EMX-ENC industrial enclosure provides a NEMA 4X / IP65 rated polycarbonate housing with padlock.
- Product Line:
- EMX Series
- Revenue Grade:
- Yes
- Accuracy Class:
- ANSI C12.20 Class 0.2
- Communication:
- BACnet MS/TP
- Communication:
- Modbus RTU
- Communication:
- Modbus ASCII
- Current Input:
- 333 mV
- Current Input:
- Rogowski
- Mounting:
- DIN Rail
- Country of Origin:
- USA
