Table of Contents
Use the below links to navigate to the section you need:
-
What's In The Box
- Battery Replacement
- Support
Introduction
Thank you for purchasing a pulse monitoring device. This manual explains how to install and set up the product.
Before the installation and use of the product, carefully read the supplied instructions.
The “U Series” pulse device allows the monitoring of gas, water, and electricity usage via a pulse output.
Specifications
| Measurement Range | |
|---|---|
| Channels | 2 |
| Minimum Closed Time | 10ms |
| Minimum Open Time | 10ms |
| Pulse Frequency Limit | 0 – 50 Hz Observing minimum open/closed timings |
| Pulse Minimum Duration | 20 ms Observing minimum open/closed timings |
Note: This product can have up to two datapoints.
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.
Safety
Warning
- Do not interfere with meter seals or certified components
- Do not modify the meter pulse output
- Always follow site-specific safety procedures
- Use barriers where required by regulation or best practice
Caution: If the battery becomes hot, swollen, leaks, or emits an unusual smell:
- Stop using the device immediately
- Remove the battery if safe to do so
- Move it away from flammable materials
- Contact Invisible Systems support
Caution
- Do not dispose of lithium batteries with general waste.
- Used batteries must be disposed of in accordance with local regulations.
Warning: Keep batteries out of reach of children. Swallowing a lithium battery can cause serious injury.
Caution: This product uses a replaceable 3.6V lithium battery (Type C - as supplied or specified by Invisible Systems).
- Use only the specified battery type
- Do not mix old and new batteries
- Do not use damaged or leaking batteries
- Do not short-circuit battery terminals
- Do not crush, puncture, or incinerate the battery
Caution: This product is intended for indoor installation only.
What's in the Box
Note: The battery is supplied pre-installed. No additional parts are required for installation.
| Item | Quantity |
|---|---|
| U Series Pulse Device | 1 |
| Specified Connector | 1 |
Options
Available probe configurations and cable lengths.
| Item | Code |
|---|---|
| Bare pulse connector | |
| Optical Reader | |
| Pulse Splitter / Chatterbox | |
| Gasket |
Before You Start
Prerequisites
Note: An active gateway must be installed and active before proceeding with sensor installation.
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
- The meter provides a standard pulse output or a compatible optical pulse LED
- The pulse output type and rate are known (where available)
- The device configuration matches the meter type
- Safe access to the meter has been confirmed
- Installation must not interfere with the operation or certification of the meter.
Tools Required
- Screwdriver or bit
- Mounting Pad - Double Sided
- Mounting Screws (optional)
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
Standard Installation (Pulse Output – Wired)
Use this method where the meter provides a hard-wired pulse output.
Identify the Pulse Output Terminals
Locate the pulse output terminals on the meter. Refer to the meter manufacturer’s documentation if required.
Connect the Pulse Inputs
Connect the device input wires to the meter pulse output terminals in accordance with the wiring information provided.
- Input 1 → Red & Black
- Input 2 → Yellow & Blue (If required)
Ensure connections are secure.
Route and Secure the Cable
Route the cable to avoid strain, sharp edges, or heat sources. Secure using cable ties where appropriate.
Power and Activate the Device
Power the device and confirm successful activation (LED behaviour as described elsewhere in this guide).
Installation Using an Optical Reader
Use this method where the meter provides a visible pulse LED rather than a wired output.
Locate the Pulse LED
Identify the usage LED on the meter (typically a red flashing LED).
Clean the Meter Surface
Ensure the surface around the LED is clean and dry.
Attach the Optical Reader
Position the optical reader directly over the pulse LED and secure it using the supplied adhesive or fixing method.
Caution: Ensure the reader is correctly aligned with the LED to avoid missed pulses.
Route and Secure the Cable
Route the cable safely back to the monitoring device and secure as required.
Activate and Verify
Activate the device and verify that pulses are being detected in the platform.
Gas Meter Installations (Mandatory Barrier)
When installing on a gas meter, a barrier device (for example, a chatterbox) must always be used.
Install the Barrier DeviceFit the barrier between the gas meter pulse output and the monitoring device in accordance with the barrier manufacturer’s instructions.
Connect Pulse Wiring via the Barrier
Connect the meter pulse output to the input side of the barrier, and the monitoring device to the output side of the barrier.
Verify Isolation
Confirm that the barrier provides electrical isolation between the gas meter and the monitoring device.
Dual Input Configuration (If Applicable)
Where two pulse inputs are used:
- Ensure each input is connected to the correct meter or channel
- Record which input corresponds to which meter or register
- Configure the inputs correctly in the platform during setup
Sensor Activation
Remove the Rear Cover
- Using a suitable screwdriver, remove the four screws from the rear of the sensor.
Caution: Sensor cables pass through the opening in the top cover. When separating the case ensure cable is not pulled.
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.
Note: Do not proceed with installation if you have not seen the successfully connected flashes, refer to the Common Issues section.
Re-fit the Cover
- Replace the cover and secure it using the four security screws.
Apply the Mounting Pad
Note: You can secure the device using the provided screw holes if adhesive pads are not suitable.
- Apply mounting pad to the rear of the device
Mount the Device
- Secure the device in the pre-selected location, ensuring it is firmly fixed
Add the Sensor to the Live Platform
- 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.
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
Note: It may take up to 10 minutes after activated for data to appear.
Installation and commissioning are complete once data is visible in the Live platform.
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. |
Resetting the Sensor
Remove the Rear Cover
- Using a suitable screwdriver, remove the four screws from the rear of the sensor.
Caution: Sensor cables pass through the opening in the top cover. When separating the case ensure cable is not pulled.
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.
Note: Do not proceed with installation if you have not seen the successfully connected
Battery Replacement
Caution
- Do not use damaged, leaking, or swollen batteries
- Do not mix old and new batteries
- Do not short-circuit, crush, puncture, or incinerate batteries
- Keep batteries out of reach of children
Remove the Rear Cover
Remove the four security 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
Caution
- Do not lever against the PCB or components.
- Do not pull from one side only, as this may damage the terminals.
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.
Support
For the fastest resolution, please use the Support options below.
- Visit www.invisible-systems.com
- Select Support from the main menu
- Access the Help Centre or Raise a Support Ticket
When raising a support ticket, please provide:
- Device ID
- Site name
- Description of the issue