Monitoring Analogue and Digital Signals

At Caption Data we focus on certain application areas and Market sectors, however all of these are doing essentially the same things.

That is, taking signals or input/outputs from sensors, instruments, transducers or control systems, then capturing the data and transmitting that data securely via the mobile phone networks to our secure servers; then allowing client access to a cloud service where the data is already shown graphically illustrating trends and relationships, and with a host of other functionality.

This functionality includes things like:

  • Setting hi/lo alarms on all parameters
  • Setting monitor and report frequencies [from 1 min to 1 day]
  • Setting alarm recipients, by email or SMS
  • Dynamic charting with ability to annotate and share
  • Management reporting
  • Audit trail
  • API
  • … and much more

Online and Real Time Graphic
So although we tend to focus on specific areas, the reality is that many of our products will work seamlessly with any number of other measurements.

The circuitry does not care what it is measuring!

So when a new customer asks us to monitor a parameter we have not worked with before it is often straightforward and quick to implement!

Analogue Signals

Analogue signal
Analogue Signal

Analogue signals vary continuously over time [for example sound, where microphones turn variations in air pressure into analogue signals] , and instruments tend to have common output ranges eg nowadays  4-20 mA or historically 0-10 Volts.

In theory an analogue signal has infinite resolution, although there are a host of practical reasons making this not so. Consequently many traditionally analogue devices have become digital over the years.

Digital Signals

Case Study One - Remote monitoring points the way to corrosion prevention

Corrosion of pipework and components in water based heating and cooling systems nearly always results in costly repairs and unwelcome disruption, especially where a large office block, hospital or district heating scheme is concerned. When failures occur in the low temperature hot water (LTHW) or chilled water (CHW) systems the tendency is to investigate the failed component and possibly much later to call in specialist corrosion consultants to find the root cause of the problems and recommend a solution.

In this case parameters being measured include dissolved oxygen, pH, flow and pressure.

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Case Studies Tab - MCS Water Plant Room

How do we do this?

CDL operate across the whole technology stack of IOT, from the sensor or device, right up to the cloud and UI/UX and analytics. This means we can easily take our standard building blocks to create your unique system.

Our IIoT Hardware

Nano ULTRA-Range

Key NanoULTRA-III (Elite) Remote Monitor Features

  • Seamless cellular communication with the CDLSmartHub™ asset cloud platform
  • Simple installation and configuration, achievable at scale with non-technical employees
  • RS485/232 communication with the toolset to quickly set up Modbus communications (one
    off configuration charges apply – see price list) Cloud-based IoT platform
  • Onboard WiFi and Ethernet connectivity
  • Digital and Analogue i/o’s available (CDL also offer a wide range of expansion modules)
  • World wide accreditations offering a truly global, enterprise-grade solution
  • GPS location and tracking capabilities
  • Integrated SD card storage for mass storage of granular data sets
  • Firmware Over The Air (FOTA) for agile innovation and system management


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CDL Smarthub

  • Switch h/w on and immediately see unit on line
  • Unique/white label portal
  • No software to buy or load
  • Any internet device
  • Any browser


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Actually it's not software!

It's SaaS, Software as a Service. We host all the software on our super secure servers (see more on security), and provide you with real time access to data in graphical format via the CDLSmartHub, which is completely web based and means there is no need to install software - making the CDLSmartHub accessible from any device, anywhere, at anytime.

CDLSmartHub Tab

Features and Benefits

  • Accessible online via the CDLSmarthub
  • No need to download / install software
  • Auditable trail of data for due diligence
  • User friendly interface

  • Initial and ongoing support
  • Multi-tiered user access levels
  • Remote management of system configurations


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