PIR Detectors for CCTV

From CCTV Information
Revision as of 13:10, 12 January 2009 by Gb003162 (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Genesis Wireless PIR

Luminite Electronics is the UK's leading manufacturer of intelligent Passive Infra Red detectors, including Genesis, an exciting wireless solution. Costing less than traditional solutions, this new PIR offers a range of powerful and innovative features and will meet the requirements of the most demanding CCTV and security applications.

The Genesis wireless PIR has an improved detection range with a choice of four different lenses to meet most installation applications. In addition, it can transmit signals well beyond 1 km depending on environmental conditions and, with the use of repeaters, will achieve more than ten kilometres. Using wireless PIR detectors enables installations to easily conform with BS8418 standards which requires all PIRs to be installed in view of cameras and looking inwards. The unit is battery operated with an operational life of up to two years before they need changing.

Genesis features a new algorithm that increases sensitivity whilst reducing incidences of false alarms from events such as moving trees, sunlight reflection, flapping tarpaulins and plastic bags. There is also an anti- cloaking feature as well as shock sensing and anti-tamper. Uniquely Genesis offers a remote text output that enables alarm messages to be recorded onto video pictures using a DVR. These alarm messages can also be viewed in the monitoring centre alerting staff if attention to a particular unit is required.

Genesis is ideal for larger deployments as up to 64 PIRs can be connected on a single system for maximum coverage. In addition to event detection and tamper alerts, each unit transmits a wide range of data including battery condition, unit ID and pulse count setting, which enables the sensitivity of each PIR to be tailored to local conditions. This data can also be received using an optional handheld instrument enabling systems to be quickly and easily walk tested or configured by a single person.

The new Genesis PIR has a range of advanced features and delivers improved performance without requiring costly quad technology systems. It will enable installers to increase the resilience and reliability of their systems whilst achieving compliance with BS8418.

Genesis is one of the strongest PIRs currently available with a waterproof casing constructed throughout from polycarbonate, offering greater robustness and resistance to cracking. Genesis does not use any metal ball joints to eliminate the fatigue and fracturing that often occurs as a result of corrosion on traditional units. In addition, build quality is maintained to the highest standard using the latest SMT techniques and gold plated circuitry for greater reliability.


Genesis PIRs and Control Products

Wireless PIR detectors

LGWP1520 wide range, LGWP4004 narrow range, LGWP12HC horizontal curtain

The LGWP range of Wireless Passive Infra Red Detectors (PIR) allow Fast, flexible installations with low maintenance and costs.

These new PIR detectors have a battery life of around two years which is achieved by a special regulator that maintains optimum performance while the batteries are running down.

The PIR also contains a shock sensor for detecting physical attack as well as a sensor for anti-cloaking. A thermal sensor adjusts the parameters of the PIR in extremes of heat and cold to maintain optimum performance. Periodic poling transmissions verify that the detector is operational whilst also sending information such as battery condition, lens type, pulse count settings and software version number.

There are currently three popular lens patterns to choose from:

  • The standard 15 metre x 90º version (LGWP1520) provides coverage of 15 metres out by 20 metres across.
  • The 40 metre 1º version (LGWP4004) provides a narrow beam that expands out to 4.5 metres wide at 40 metres range. This is ideal for perimeter coverage.
  • The horizontal curtain type (LGWP12HC) can be mounted up to 12 metres high and made to look straight down, providing curtain coverage across doors, windows and shutters. It may also be used to look straight ahead where creep zones are not required.

The detachable sun shield shown here is optional.


LGMT434 - Masthead / Repeater

The Genesis Masthead is weather proof to IP66 and forms the heart of a Genesis Wireless system. Its purpose is to receive alarm data from the PIR’s and pass it to a control unit via an RS232 link.

A Masthead can transmit data as well as receive it, which means it will transmit back to a Walk Test Instrument to show all received information as well as the signal strength at the masthead. In this way the installer knows that the detector is working correctly and also that it is being received by the system. In addition, it can perform as a repeater for systems that require greater transmission operating distances. Up to seven repeaters can be used in any one system to provide transmission range of several kilometres. Finally, the Masthead can be programmed with individual names for each unit number which are transmitted to the walk test instrument or pager to aid location of the detector. An optional aerial (AE434) may be used instead of the supplied aerial for improved reception.


LGWT434 - Walk Test Instrument

The Genesis Walk Test Instrument is a Transceiver that has the ability to receive signals directly from the PIR detectors or via the Masthead. It can also transmit to simulate a PIR in order to check proposed PIR positions before installation begins.

An LCD shows PIR information such as ID number, Lens type, Pulse count setting, signal strength and battery condition. In addition, the display can also show an alpha numeric name for each PIR which makes identification easier.


LGMRU4x4 - Masthead Relay Unit

The Genesis Masthead Relay Unit is weather proof to IP66 and can be fitted externally with a camera and be connected directly into the alarm pre-sets.

This unit provides either 4 alarm outputs with corresponding tamper outputs or eight alarm outputs without tampers. DIL switches set the different modes as well as the unit code groups. Expansion units are available to increase the number of alarm outputs. There is no limit to the number of LGMRU4x4 units that can be used on any one system. This unit can transmit information as well as receive it, which means it will transmit back to a Walk Test Instrument to show all received information as well as the signal strength at the masthead. In this way the installer knows that the detector is working correctly and also that it is being received by the system. In addition, it can perform as a repeater for systems that require greater transmission operating distances. An optional aerial (AE434) may be used instead of the supplied aerial for improved reception.


LGDM16 - Plug & Play interface to DM's DS2 DVR

The LGDM16 control Interface unit provides a direct Plug & Play interface to a Dedicated Micros DS2 DVR without the need for RAM modules.

A Masthead transceiver receives the data from the PIR detectors and passes it to the LGDM16 control unit in the form of RS232 text messages. The LGDM16 then converts the data into the Dedicated Micros protocol on RS485 to provide 16 alarm and 16 tamper outputs. Between one and four LGDM16 interface units can be connected with a single masthead receiver to provide up to 64 alarm and 64 tamper commands that can be interfaced to a DS2.

On the front panel, a display shows information on alarms, faults and tampers which are held in a log. The PIR’s call in periodically and are monitored individually. If they fail to call in, a tamper will occur. An additional RS232 text output provides alarm and other information that can be inserted on a video picture for remote viewing.


LGRU16 & LGRU16ELR - Relay Units 16 Alarms & 16 Tampers

The LGRU16 & LGRU16ELR control interface relay units provide physical alarm and tamper outputs for DVR and Alarm systems.

The LGRU16 is supplied with one LGRM8 relay module which provides 8 alarm and 8 tamper relay contacts that can be interfaced to virtually any alarm system. A further LGRM8 module can be added to increase it to 16 alarm and 16 tamper outputs. Between one and four LGRU16 relay units can be connected with a single masthead receiver to provide the maximum of 64 alarm and 64 tamper contacts. The LGRU16ELR version has screw terminals and End Of Line Resistors built in. The resistor values are plug-in modules and may be changed accordingly. On the front panel, a display shows information on alarms, faults and tampers which are held in the log. The PIR’s call in periodically and are monitored individually. If they fail to call in, a tamper will occur. An additional RS232 text output provides alarm and other information that can be inserted on a video picture for remote viewing.


LGRM8 & LGRM8ELR - Relay Modules

The LGRM8 & LGRM8ELR relay modules can be fitted to an LGRU16 or LGRU16ELR to provide an extra 8 alarm and 8 tamper contacts.

The LGRM8 relays provide eight Normally Closed tamper contacts and eight Change Over alarm contacts. This module is supplied with a one metre ribbon cable which can be easily stripped back for individual connection to alarm inputs. The LGRM8ELR version has screw terminals and End Of Line Resistors which can be plugged in as modules. It is possible to connect up to four LGRU16's together to provide the maximum of sixty four alarm and 64 tamper outputs from a system.


LGBX64 - Plug & Play interface to Baxall’s Vivid DVR

The LGBX64 control interface provides an RS232 Plug & Play connection to a Baxall Vivid DVR.

A Masthead transceiver receives the data from the PIR detectors and passes it to the LGBX64 control unit in the form of RS232 text messages. This unit can learn up to the maximum of 64 PIR’s or transmitters and will monitor each one individually to check battery voltages and ensure that they call in regularily. Up to 64 alarms and 64 tampers can be passed directly to a Baxall Vivid DVR simply by connecting a Plug and Play serial cable, therefore saving a considerable amount of time. Other types of DVR that operate on Key Words may also be used. On the front panel, a display shows information on alarms, faults and tampers which are held in the log. The PIR’s call in periodically and are monitored individually. If they fail to call in a tamper will occur.


LGTX434 - Wireless Genesis Transmitter

The LGTX434 transmitter module enables other detection products to interface with the Genesis Wireless system such as Active Infra Red Beams and Door Contacts.

The module is powered from batteries and has a special regulator that maintains optimum performance even when the batteries have run down. When used with battery beam sets, the LGTX434 will report the battery status of the beam set. Just like the LGWP detectors, this transmitter module poles every minute to inform the system that it is still operational and to advise the battery condition.


Genesis Wireless PIR System - Working Diagram

How the system works

When a PIR detects activity within its field of view, it will transmit a coded message to a receiver within range that is set to respond to the same code. Two types of receiver are shown above.

The LGMRU4x4 has relay outputs for direct connection to camera pre-sets. One of these receivers will be fitted next to each camera and can provide up to 8 alarms or 4 alarms with 4 tampers.

The LGMT434 receives the messages from the PIR’s and passes them to a control interface unit via a four core cable. The cable can be up to 100 ft long. Three different types of control unit are shown in the example and each are designed to interface with popular DVR’s and alarm systems.

Please contact us to discuss your individual needs or with any system questions.