Base Station – Hanwell radio system component

The SR2 is the second generation of the Hanwell Smart Receiver. It is a network enabled receiver, designed for collecting environmental monitoring data from multiple points within a site, or across multiple sites. In addition, it can be upgraded to a transceiver which both receives and retransmits the data. It uses standard TCP/IP communications protocols for speedy data handling. The network traffic generated is very low and data is automatically sorted and filed. See the diagram overleaf for some potential ways of using the SR2, or contact Hanwell to discuss your site specific requirements.

In addition to receiving data from the ml2000 and ml4000 ranges of sensors, the unit can also read hard-wired sensors and, optionally, be fitted with up to eight onboard probes. Each SR2 can handle data from up to 253 sensors, and up to 16 SR2s can be run on a single system bringing it to a total of 4048 sensors. The SR2 supports Hanwell’s standard and extended transmission data formats.

The SR2 logs all received data in its on-board 512kb memory. The Radiolog software continually interrogates the SR2 for the most recent data, and downloads the data according to user-defined logging periods to the server or operating PC. Software users can view live and historic data, produce out of spec and summary reports and set alarms on both the data levels and the rate of change.

In addition to the data readings from the sensors, the SR2 can log the corresponding Received Radio Signal Indicators (RSSI) which reveal the strength of radio reception of each Sensor. As well as being logged, the RSSI is indicated on the front LCD along with other status information. An optional remote Receiver can be connected to improve radio reception in difficult areas.

The SR2 is designed to be in constant communication with the software but has user-configurable fallback behaviour in the event of network or power failure. An on-board battery provides a UPS with 2.3A/hour life to carry it through up to 12 hours’ power disruption (larger external UPSs are available as an optional extra).

Alarm relays are included: these can indicate that the readings are out of specification, and can be optionally set to indicate a network failure. A MS BUS connection allows the SR2 to drive the Hanwell ms1000 environmental control system.