emonTx6: 6-Channel Energy monitoring wireless expander node

£194.11 (Inc. VAT)

£161.76 (Ex. VAT)

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The emonTx6 is a high-precision electricity monitoring node featuring 6 CT channels. Designed for flexibility, it supports both single-phase and 3-phase AC circuit monitoring.

Key Features

System Expansion: Use it to scale an existing emonPi system
Wireless Integration: Transmits data via a built-in 433MHz radio to an emonPi or emonBase station. This is ideal for installations where the monitoring point and the internet gateway are in different parts of a building.
Wired Versatility: While optimized for wireless transmission, the emonTx6 can also be connected directly via USB to an emonPi for stable, wired data transfer when required.

Key Features

Advanced Measurement Capabilities

6x CT Sensor Inputs: Supports a wide range of 333mV voltage-output CT sensors.
Precision Voltage Sensing: Dedicated RJ45 input for the emonVs sensor, enabling full real/active power measurement.
Continuous Sampling: No gaps in data; captures every cycle for high-accuracy energy accounting.
Multi-Phase Support: Compatible with Single-Phase, 3-Phase (4-wire)
Persistent Data: Cumulative energy totals are saved locally and survive power reboots.

Technical Specifications

Component	Detail
Microcontroller	Microchip ATSAMD21J17
Voltage Reference	Microchip MCP1501 (Precision Reference)
Radio Module	RFM69CW @ 433.92 MHz
ADC Type	Single-ended 12-bit continuous sampling
Enclosure	Wall-mount aluminium (65 x 100 mm)
Compliance	UKCA & CE Approved \| Made in the UK

Configuration & Sensor Selection

1. Voltage Sensor & Power Supply

The emonTx6 requires an emonVs sensor to provide power and high-precision voltage readings.

Default: A single-phase emonVs with a UK plug is pre-selected.
3-Phase/Split Phase: Choose the 3-phase emonVs for 4-wire 3-phase (Note: 3-wire 3-phase systems are not supported)
Sharing: If you have an existing emonVs, use an emonVs RJ45 Duplicator to share the signal (a single emonVS can power multiple emonTx6, but only one emonPi3)

2. CT Current Sensor Selection

For maximum accuracy, match the CT sensor rating to the circuit capacity:

Circuit Rating	Recommended CT	Link
Up to 20A	20A Voltage O/P	View Product
Up to 50A	50A Voltage O/P	View Product
Up to 100A	100A Voltage O/P	View Product
Up to 200A	200A Voltage O/P	View Product

CRITICAL COMPATIBILITY NOTE: The emonPi3 requires voltage output CT sensors. Legacy "current output" YHDC (blue) 100A sensors are NOT compatible.

3. Temperature & Pulse Sensing

Temperature: Supports 8x DS18B20 sensors (up to 6 tested). Requires pluggable terminal blocks.
Pulse Counting: Supports 3x pule count inputs Optical Utility Meter LED Pulse Sensor.

Note: Temperature sensing and pulse counting cannot be used at the same time.

Compatibility

Hardware: Backwards compatible with the RJ45 emonVs used on the emonPi2.
RF Frequency: Operates on 433.92 MHz. Older nodes (emonTH2, emonTx4) using 433.0 MHz will require a firmware update.

Documentation

Resources: Overview | Hardware GitHub | CE Declaration (PDF)

Setup Examples: