AT-449

## ~~-~~ AT AT ~~=~~ 449 EVERYTIME TIMER 449 EVERYTIME TIMER 

This extremely versatile unit has TWO timer periods. Timer ‘A’ (what happens once the unit is triggered) and Timer ‘B’ (what happens after timer ‘A’ has finished) Operates on any voltage between 12 and 24V DC. Adjustable from 1 second to 64 weeks. 

## The unit has three basic functions:- 

- Simple timer, whereby the relay state is changed, either during or after the programmed time following a trigger. This is referred to as A time. 

- Cyclic timer, whereby the on and off times of the relay can be separately defined. These times are referred to as A and B times. 

- Counting of trigger inputs, whereby the relay state is changed after a set number of trigger pulses have been seen. 

Seven modes of operation, edge or level trigger and clean contact. High or low trigger level. 

## examples:- 

|Mode 0|If a door is opened an alarm sounds for a fixed time. A reset is<br>required after the alarm has sounded.|
|---|---|
|Mode 1|If a door is left open for a period exceeding the A time an alarm<br>sounds. A reset is required after the alarm has sounded.|
|Mode 2|A machine has a cycle time of say 5 seconds. At the start of the<br>cycle the timer  starts and counts for 5 seconds, then the relay<br>changes state. At this point the timer requires a reset  and if the<br>trigger is still active the cycle start again. If, however, it is not, the<br>machine has jammed or malfunctioned.|
|Mode 3|If a sensor detects movement, lights are turned on for A time.<br>Further movement does not extend lights on time. No reset is<br>required.|
|Mode 4|Testing a dual path signalling system by opening the P.O. line<br>once every 30 days for 15 seconds.|



|Mode 5|Generates a signal once every week to test a valve. The open<br>signal will remain present until the valve signals that it is open. If<br>this signal is longer than expected it could be used to trigger an<br>alarm using another timer.|
|---|---|
|Mode 6|Useful for dividing the trigger inputs by up to 255. Say you need to<br>count the number of people entering a building on a counter with<br>only two digits and more than 100 enter.|
|Mode 7|“Man down” : once the timer is activated it must be deactivated<br>within the time period (A). Failure will result in relay being activated<br>for a set time period (B), then resetting (ready for the next starting<br>trigger). This mode does not require a site visit to reset.|



We have an extensive library of modes that can be incorporated should the product not fully cover your requirements, for further information please contact us. 

## Output Levels 

## Electrical Operating Conditions 

Double pole contacts 

AC: Maximum Switching voltage 250 volts, maximum current 5 Amps (non inductive load) 

Operating voltage 12 to 24V DC, maximum ripple 2V peak to peak 

DC: Maximum Switching voltage 30 volts, maximum current 5 Amps (non inductive load) Minimum switching level 5V @ 10mA 

Reverse power connection indicated by constant red LED 

Current drain, relay not active, approximately 10mA, relay active approximately 55mA 

## Enviromental Operating Conditions 

## Input Levels for Trigger or Reset 

Temperature range -10°C to +60°C Maximum humidity 80% non condensing 

## LOW: 

Less than 220 ohms to ground OR an input of less than 0.8 volts 

## Dimensions 

## HIGH: 

100 X 55mm 

Greater than 4700 ohms to ground OR an input of greater than 4 volts 

Maximum input voltage 30V 

## Packing Weight 

Minimum input voltage -4V 

86 grams 

Peak current available from either pin, 5mA 

Supplied in Protective carton with 4 self adhesive fixers & full instructions. 

## Bentley Security Projects Ltd 

Dickinson Street, Oldham, OL4 1HD | Tel: 0161 620 6992 | Fax: 0161 620 6995 

## www.bentleysecurity.com 

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