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Oxfordshire Fire & Rescue Service wanted to use GSM as the basis for a tertiary alarm system.

With its SentryGSM3Alarm at the core, Sentry Telemetry developed a user specific solution. Pre-defined SMS text messages are sent to the duty fire fighters' mobile phones in response to push button inputs to suit the alarm condition. Additionally, alarms can be triggered remotely from a PC.

Following a series of trials with the Fire Service, the bespoke solution has been refined and is now being rolled out as the county-wide standard.

Project Objectives

The Fire Service specified various key parameters that were core to providing an easy to use, reliable alarm system:

  • 4 inputs and 4 outputs
  • Alarms sent via SMS using dual band, standard SIM cards
  • Progammable and controllable remotely via SMS
  • 12-14Vdc operation
Possible Alarm Actions
  • Relay(s) ON permanently or ON for ‘x’ seconds, then OFF
  • Relay(s) OFF permanently or OFF for ‘x’ seconds, then ON
  • Send Alarm notifications via SMS to a list of recipients
  • Relay incoming pager message to a list of recipients by SMS

SentryGSM3Alarm capabilities

The SentryGSM3Alarm is a quad band device using a standard GSM SIM card. Its multifunction controller accepts up to four digital (volt free) inputs and has four relay outputs. For each input triggered, up to five combined actions may be programmed.

User Defined Parameters

These include, but are not limited to:

  • Normal state of input 1,2, 3 and 4
  • Actions taken when inputs 1,2, 3 or 4 are triggered
  • Alarm messages for input 1, 2, 3 and 4
  • Recipients for messages 1, 2, 3 and 4
  • Recipients for pager relay
  • 3 messages per input
  • 20 recipients per message
Remote Sensing, Monitoring & Metering

Oxfordshire Fire & Rescue
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