Pressac: Energy-harvesting current sensors and building sensing

Pressac manufactures wireless current and building sensors, with distinct LoRaWAN and EnOcean ranges and MQTT gateway integration.

Summary

Best for
Retrofit current monitoring where energy harvesting can avoid sensor battery replacement.
Less suited to
Revenue energy metering using a current-only clamp: current alone does not establish real power or billed kWh.
Deployment
Choose a LoRaWAN network or the separate EnOcean sensor and gateway path.
Data in
LoRaWAN current readings, or EnOcean sensor messages through a gateway to MQTT.

Overview

Pressac designs and manufactures wireless sensing technology for buildings and equipment. Its current-monitoring products are particularly relevant to retrofit projects where running communications cables or replacing many batteries would add maintenance work. The range includes LoRaWAN CT clamps and a separate EnOcean current-sensor family.

A current reading can show whether equipment is operating and how its electrical load changes. It is not, by itself, a direct measurement of real power or accumulated energy. A comparison with an electricity meter should account for voltage measurement and power factor rather than treating every product described as an energy sensor as interchangeable.

Offering

The LoRaWAN CT clamp range has variants for different current ranges and conductor sizes. Pressac describes energy harvesting from the measured conductor, so normal operation does not depend on replaceable sensor batteries. Available variants include 1–60 A, 2–200 A and 2–600 A ranges.

Harvested energy still has an operating boundary. The product documentation relates reporting behaviour to available current and operating mode. A circuit that spends long periods at very low load therefore needs a different assessment from a steadily loaded machine. The clamp's opening, current range and reporting behaviour all matter; selecting only by the largest current printed in a catalogue overlooks the low-load condition.

Products and platforms

  1. LoRaWAN CT clamps

    Wireless current sensors

    Energy-harvesting current clamps with regional LoRaWAN variants.3

  2. EnOcean current sensors

    Wireless current sensors

    A separate EnOcean range with single- and three-channel arrangements.4

Technology

Pressac's LoRaWAN clamps use Class A operation and are offered in EU868 and US915 variants. The EnOcean current sensors use a different radio protocol, with their own regional versions and equipment profiles. A LoRaWAN gateway cannot be substituted for an EnOcean receiver simply because both products collect wireless current measurements.

The Pressac Gateway documentation describes MQTT connectivity and configuration, including network and platform integration topics. For the EnOcean path, the gateway translates incoming sensor data into the application's collection interface. Network transport, payload meaning and engineering units remain separate concerns. A useful commissioning record identifies the sensor model and channel together with the message field that represents its measured current.

Markets

Pressac's company history describes its move into wireless energy-harvesting sensors and smart building technology. Its current sensors suit questions such as when a machine runs, whether a circuit remains energised outside scheduled hours, or how current changes across operating states. Those are practical monitoring tasks even when a project does not require a certified energy total.

The EnOcean product family includes single- and three-channel arrangements, while the LoRaWAN clamps provide another deployment choice where that network is already present. Choosing between them starts with site coverage, receiver infrastructure and the application's data path. An existing network can be valuable, but it does not remove the need to check measurement range and reporting behaviour.

Company

Pressac's company history places its origins in the 1950s and records the incorporation of Pressac plc in 1966. Its published contact address is in Nottingham, United Kingdom. The company describes design and manufacturing capabilities as part of its sensor offering.

That manufacturing background is relevant where a project needs repeatable physical installations across many circuits or buildings. The product-level comparison still rests on specific interfaces and operating conditions: a LoRaWAN clamp, an EnOcean current sensor and a gateway play different roles. The gateway support library provides a more useful starting point for integration planning than assuming that a broad smart-building label implies a particular building-management protocol.

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References

  1. Pressac company history (opens in a new tab)
  2. Pressac Nottingham contact address (opens in a new tab)
  3. LoRaWAN CT clamp specifications (opens in a new tab)
  4. EnOcean current-monitoring sensors (opens in a new tab)
  5. Pressac Gateway support library (opens in a new tab)

This profile does not imply a commercial relationship with Pressac and may contain inaccuracies.