Data Acquisition & Telemetry


Alarms for unmanned wastewater/effluent plants

August 2005 Data Acquisition & Telemetry

Omniflex has developed the Silent Sentry SMS Alarm Monitor for GSM cellular networks to support short message service (SMS) transmission of data from remote unmanned outstations that require monitoring and notification to the mobile phones of service responsible personnel in the event of an alarm condition.

"The suitability of GSM networks has become a reality due to their coverage, reliability and low cost of ownership," comments Ian Loudon, Omniflex sales manager. "There is no infrastructure cost to consider as you have with in house radio-based systems and you can extend your monitoring countrywide - in fact it is possible to use the technology outside the countries' borders too. A simple SIM card contract is all that is required."

The system comprises:

* Silent Sentry with up to 12 universal inputs (analog or digital) and single serial port for third party device interfacing.

* A SIM card contract for data communication.

Silent Sentry is suitable for remote, unmanned applications where a timely alarm direct to the mobile phone of personnel responsible for the plant gives them the opportunity to take corrective action before it is too late. Wastewater treatment and effluent plants tend to be isolated and unmanned. If something goes wrong it is often too late by the time the problem is spotted by plant personnel with the resultant consequential losses to the organisation.

Silent Sentry provides direct SMS to service personnel mobile phones with required acknowledgements and escalation to another phone if no response is received ensuring that alarms are attended to. Reporting by exception (Change of State) or an analog input exceeding a limit alarm triggers the SMS message. The Silent Sentry outstations are capable of interfacing to digital and analog input signals or even intelligent devices like a PLC with serial protocols. Eg, Modbus.

Silent Sentry has the following features:

* Integrated GSM SMS communications.

* 12 direct inputs analog or binary.

* Integrated modbus port (master or slave modes).

* 9-30 V d.c. powered.

* Send up to 64 different messages.

* Send to up to 10 recipients.

* Sends a daily status message.

* Integral realtime clock battery backed.

* Compact and DIN rail mounting.

Simple and easy configuration

Configuration is easily done from a computer with a serial port. Free configuration software (OmniSet) is supplied with the Silent Sentry. The windows based menu driven configuration with on-line help provides the user with a simple configuration to set-up the unit. This can be performed after installation using a laptop computer, if required.

For more information contact Ian Loudon, Omniflex, 031 207 7466, [email protected], www.omniflex.com



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