Configurable Third Zone; Serial Status Connection; ; Timer Display; Low Pressure Input And Indicator; Programmable For 'Single Knock'; Extract Fan Control as Standard; Fire Relay Contact; and much more.


Until recently, the design and functionality of one of the most important pieces of equipment associated with fire protection extinguishing systems (the control panel), has not been specified by a common standard. This changed in 2003 with the publication of EN12094-1:2003, Fixed firefighting systems (Components for gas extinguishing systems, requirements and test methods for electrical automatic control and delay devices). This standard specifies the functionality and test methods for the control equipment thus enabling a competent body to issue certification.Now, BS7273-1:2006 the Code of practice for the operation of fire protection measures (Electrical actuation of gaseous total flooding extinguishing systems), contains direct references to control and indicating equipment standard EN12094- 1:2003.Kentec Electronics have been the leading supplier of extinguishant control panels for over 20 years. As market leaders in this field, we were the first to be able to offer a fully compliant, certified control panel as required by the Construction Products Directive, specified in BS7273-1:2006 and specified by the CEA4045 (Comité Européen des Assurances).

The Sigma XT has been fully certified as compliant with EN12094-1:2003 by BSI; the only UK notified body accredited to do so and is licensed to carry the BSI Kitemark symbol. The Sigma XT is also CE marked in accordance with the Construction Products Directive.


The Sigma XT replaces the Kentec K2.01 control panel, which has been in service in thousands of installations since 1994. The K2.01 became an industry standard product worldwide, but with the publication of EN12094-1: 2003 has now been superseded by the Sigma XT.

We shall of course continue to support the K2.01 with spare parts when necessary. Due to its simplicity and use of readily available parts, we do not foresee any problems in continuing this support for many years.

So what has changed?

Although very different in appearance to earlier extinguishing panels such as the popular Kentec K2.01, in essence, there is not a great deal of difference in basic functionality in equipment complying with the new standards. On the whole, the requirements of the standard offer improvements to the functionality and versatility of the equipment.The requirements specified in EN12094-1 needed a completely new design of control panel and we took the opportunity to consider and build in where appropriate, customer comments gathered over the last 10 years. Some of the more significant improvements are described below.A third zone has been added. This can be used to detect fires in peripheral areas to the protected space or it can be configured to contribute to the release of extinguishant from an additional zone (a ceiling or floor void for instance).

The enclosure and construction method has been redesigned, which makes the control panel far more accessible for installation and servicing. Field trials have proven this to be a very popular improvement.The power supply is now rated at 3 Amps rather than 2.5 Amps. This allows greater alarm loads to be connected.An extract fan control is now built in as a standard function on all panels rather than as a specified, additional cost option.An indicator has been added to show Low pressure from the cylinders. This provides the facility to monitor cylinder pressure and directly indicate any loss in pressure via a dedicated, supervised input.

Time delays and flooding time are programmable in 5 second steps. The timer is also guaranteed to be accurate to better than 10% of the set time.All configuration options are programmable and stored in non-volatile memory. A configuration update counter is incremented whenever the configuration is changed to leave evidence of tampering with the system.Status units are now connected to the control panel via a serial data bus so even status units with a full complement of indicators and controls need only a four core connection.There is a visible time display on the control panel and at all status indicator units which shows the time remaining until the extinguishant is discharged.

Sigma Si Status Units

To compliment the Sigma XT control panel there is a range of system status units. Up to seven status units can be connected on a serial bus and require just two cores for data and two cores for power. Once connected, status units are supervised and the Sigma XT control panel will indicate a fault condition should any unit become disconnected.

Status units have either 6 indicators or 10 LED indicators (with common fault and 3 fire zone indications). Versions are also available with mode select keyswitch only or mode select keyswitch and manual release control. All status units have monitored inputs for the remote connection of Automatic/Manual mode and Hold switches, there is also a seven segment LED display which shows the time remaining until discharge occurs. All status units are housed in an attractive steel enclosure to match the control panel and measure just 186 x 132 x 50mm.

Status units are available in standard flush or surface mounting versions or weatherproof (IP65) surface versions of the following units:

6 lamp status unit K911000M8

6 Lamp status unit with Mode Select K911100M8

6 Lamp status unit with Mode Select and Manual Release K911110M8

10 Lamp status unit with Mode Select and Manual Release K911113M8


At no additional cost, Sigma XT control panels can be branded with customer logos or printed in languages other than English. Our extensive library of language artworks already contains over 10 languages with more being added constantly. Customised colour schemes and styling is also available (subject to negotiation).

Sigma XT Ancillary Board - S588

There is sometimes a requirement to extend signals from the extinguishing system for additional plant control or other signaling applications such as interfaces to BMS systems or house fire alarm systems.

The Sigma XT is equipped with a selection of volt free contacts which are often adequate for this purpose.

For applications that require more outputs from the system, the Sigma XT ancillary board is available. Up to seven ancillary boards may be connected to the status unit serial bus to provide distributed control and signalling at multiple locations if required.

Each output has an LED indicator which shows which outputs are operated. The Sigma XT ancillary board contains volt free changeover contacts for signalling of the following:

  • Zone 1 fire
  • Zone 2 fire
  • Zone 3 fire
  • Manual only mode
  • Disablement active
  • Released
  • Activated
  • Manual release operated
  • Extract fan operated
  • Hold activated