3 Channel Meter - Self Install Guide

Table of Contents

Use the below links to navigate to the section you need:

• Introduction

• What's In The Box

• Before You Start

• Installation Steps

• Adding the Sensor to 'Live'

• Common Issues

• Resetting the Sensor

• Battery Replacement
• Support

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Introduction 

           

Thank you for purchasing a U Series energy monitoring device. This manual explains how to install and setup the product.

Before the installation and use of the product, carefully read the supplied instructions.

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Specifications

	Value	Notes
Current Transformer Type	Output ±0.333v at max rating	-
Sensor Digital Resolution	210 bits (1024 steps)	This is the accuracy of the sensor. Accuracy of reported values also depends on the accuracy of the current transformer, the absence of harmonic distortion on the power line and the correctness of the configuration of voltage and power factor parameters.
Analogue Accuracy	Better than 1%	-
Operating Range	-20°C - +60°C

 

Limitations & Responsibility

• This guide provides instructions for installing Invisible Systems equipment only.
• It does not replace site-specific risk assessments or safe working procedures.
• Invisible Systems accepts no responsibility for installation work carried out by third parties outside the scope of this guide.
• Use of the Invisible Systems platform is subject to the applicable customer agreement and platform terms.
• Damage resulting from incorrect installation or use outside the scope of this guide may not be covered under warranty.

Supported Use

This device is intended for:

• Monitoring AC electrical circuits using compatible CT clamps
• Single-phase and three-phase installations
• Indoor installations within the specified operating conditions

Unsupported Use

This device is not intended for:

• DC electrical circuits
• Installations in hazardous or explosive atmospheres
• Use outdoors or in environments outside the specified operating range
• Applications where electrical isolation and safe working practices cannot be assured

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Safety

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What's in the Box

Item	Quantity
U Series 3 Channel Device	1
CT Clamps (as ordered)	3

Options

Available configurations

Item
Rigid CT Clamps - Various Sizes, Ratings
Flexible CT Clamps - Various Sizes, Ratings

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Before You Start

Prerequisites

Before installing this device, ensure the following:

• You have an active account and login access to the Invisible Systems Live platform
• The monitoring location has been checked and agreed
• The installation location provides suitable signal coverage
• The device asset ID / label has been recorded or is visible
• You have safe access to the installation location
• The environment is within the normal operating conditions for the product

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Tools Required

• Screwdriver or bit
• Mounting Pad - Double Sided
• Mounting Screws (optional)

           

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Installation Steps

Record the Device ID

• Note the 16-digit Device ID from the sticker on the rear of the device.

  The ID will begin with 70B

                                                     

Remove the Rear Cover

• Using a suitable screwdriver, remove the four screws from the rear of the sensor.

         

 

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CT Clamps / Channels

Your device is supplied with three CT clamps, provided at the current ratings and physical sizes specified at the time of order.

CT clamps are available in two formats:

• Rigid (split-core) CT clamps
• Flexible (Rogowski) CT clamps

         

 

Where Rogowski (flexible) CT clamps are supplied, an external integrator is also provided.

The integrator must be powered for accurate current measurement. Refer to the integrator documentation for power and wiring requirements.

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Channel Configuration

The three-channel meter can be used in one of the following configurations:

• Single-phase monitoring

  Each CT clamp monitors a separate single-phase circuit

• Three-phase monitoring

  Each CT clamp monitors one phase of a three-phase circuit

Ensure the selected configuration matches the electrical installation and intended measurement setup.

                     

This information will be required during system configuration and commissioning to ensure measurements are correctly assigned and reported.

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Phase Mapping / Labelling

For three-phase installations, correct phase mapping is essential to ensure accurate measurement and reporting.

• Label each CT clamp during installation (for example L1, L2, L3)
• Record which CT is connected to each channel before closing the panel
• Ensure the recorded phase mapping matches the system configuration in the platform

Incorrect phase mapping may result in misreported or misleading energy data.

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CT Orientation

CT clamps must be installed with the correct orientation to ensure accurate measurement.

• The CT arrow or label must point in the direction of current flow, typically towards the load
• Ensure the CT clamp is fully closed around the conductor
• Do not install CT clamps over multiple conductors
• Avoid placing CT clamps on damaged or poorly insulated cables

Incorrect orientation may result in inverted or inaccurate readings.

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Installing Rigid CT Clamps

                   

Rigid CT clamps must be fully opened and correctly closed around the conductor during installation.

• Carefully open the CT clamp using the release mechanism or by pulling the two parts apart
• Place the CT around a single conductor only
• Ensure the CT is fully closed and latched before energising the circuit
• Do not force the CT closed if it is misaligned
• Do not install rigid CTs over multiple conductors or cable bundles

An incompletely closed CT clamp may result in inaccurate readings or no measurement.

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Activate the Battery

• Press the reset as indicated below.
• You should see a single green LED flash.
• Wait for 10-15 seconds, you should see a double green led flash. This indicates that the sensor has connected with the gateway.

                                             

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Confirm Device Start-Up

• 1 green flash - device powered on

• 2 further green flashes - device successfully connected to the gateway,

  If the additional green flashes are not observed, refer to the Common Issues section.

   

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Re-fit the Cover

• Replace the cover and secure it using the four security screws.

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Apply the Mounting Pad

• Apply mounting pad to the rear of the device

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Mount the Device

• Secure the device in the pre-selected location, ensuring it is firmly fixed

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Adding the Sensor to Live

• Log in in to the Invisible Systems Live Platform
• Navigate to Sensor Setup
• Select Add New Sensor
• Enter the 16-digit Device ID recorded earlier

For full platform instructions, refer to the Live Platform User Guide.

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Verify Data Is Being Received

• In the Live platform, navigate to Sensor Diagnostics
• Confirm the sensor status is online
• Verify that data readings are being received
• If data is not visible, refer to the Common Issues section

Installation and commissioning are complete once data is visible in the Live platform.

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Common Issues

Issue	Likely Cause	Action
No LED flashes after battery activation	Battery not seated or pull tab not fully removed	Recheck battery position and ensure the pull tab has been fully removed. Press the reset button.
Only one green LED flash observed	Device powered but not yet connected	Wait 60 seconds, then press the reset button. If still unresolved, check the gateway is online and move the sensor closer.
No data visible in Live platform	Device has not sent a data packet	Wait up to 10 minutes, then refresh the page. If the sensor shows online but no data is received, contact Invisible Systems Support.
Sensor shows offline in diagnostics	Battery issue or gateway connection	Press the reset button and refresh the page. If still offline, check the gateway is online and reposition the sensor closer, if 24 hours have passed contact Invisible Systems Support.
Incorrect readings displayed after 24 hours	Unsuitable mounting location	Relocate the sensor. If readings remain incorrect, contact Invisible Systems Support.

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Resetting the Sensor

Remove the Rear Cover

• Using a suitable screwdriver, remove the four screws from the rear of the sensor.

   

           

Activate the Battery

• Press the reset as indicated below.
• You should see a single green LED flash.
• Wait for 10-15 seconds, you should see a double green led flash. This indicates that the sensor has connected with the gateway.

                                             

Confirm Device Start-Up

• 1 green flash - device powered on

• 2 further green flashes - device successfully connected to the gateway,

  If the additional green flashes are not observed, refer to the Common Issues section.
  
  

Re-fit the Cover

• Replace the cover and secure it using the four security screws.

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Battery Replacement

Remove the Rear Cover

Remove the four screws and carefully lift off the cover.

Remove the Battery

The battery is secured by metal retaining prongs inserted into the PCB terminals and a double-sided adhesive pad beneath the battery.

To remove the battery:

• Grip the battery firmly on both sides

• Apply even pressure, gently rocking the battery side-to-side

• Gradually pull the battery away from the PCB until the retaining prongs disengage and the adhesive releases

                                     

Insert the New Battery

Insert the new battery into the PCB terminals, ensuring the correct polarity is observed.

Press the battery firmly into place until it is fully seated.

Confirm Device Start-Up

Observe the LED indicator to confirm the device powers on.

Re-fit the Front Cover

Replace the front cover and secure it using the two security screws.

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Support

For the fastest resolution, please use the Support options below.

1. Visit www.invisible-systems.com
2. Select Support from the main menu
3. Access the Help Centre or Raise a Support Ticket

When raising a support ticket, please provide:

• Device ID
• Site name
• Description of the issue