The PRIVATE and SECURE way to share
ONE BATHROOM between TWO ROOMS
- Electrically lock your bathroom/ensuite from an adjacent occupant until usage is complete.
- Fail-safe circuit prevents more than one door from being locked at a time.
- Doors default to ‘Unlocked’ during power failure.
- Auxiliary contact will operate Lights & exhaust fan for two minutes after the room is vacated
- Alarm contact can be extended to a buzzer or remote system if a ‘locked’ door is breached.
SM108b Door Interlock System
GENERAL DESCRIPTION
This system may be used to control electric door latches on a bathroom/ensuite that is shared between two apartments or rooms. It ensures ready access for each room occupant, while maintaining the privacy and security of a personal bathroom. The occupant of one room has no through access to the second room at any time. (except during a mains power failure)
DOOR LATCHES
Door 1 and Door 2 have mechanical latches fitted which when relaxed (off) leaves the doors Unlocked. A door is Locked whenever its latch is active (On).
The system is wired so that it is impossible for more than one door to be locked at any time.
In the event of a power failure, all locked doors will relax and assume an Unlocked state.
DOOR LATCH BEHAVIOR
When Door 1 is Opened, Door 2 is instantly locked. It remains locked as long as Door 1 remains open,
When Door 1 is closed, Door 2 is still locked. Six seconds after Door 1 is closed, the yellow indicator in the control box will flash rapidly for Ten Seconds. (this will happen each time after a Door is closed)
If during this Ten second period movement of any kind is detected within the bathroom, the system will deem the room to be occupied and Door 2 will remain locked.
If during this Ten Second period No movement is detected, then the controller concludes that the room is empty and Door 2 will be unlocked.
The same process happens in reverse with Door 2 activity.
INPUT SENSORS
The SM108b control system has Three input circuits. These are a Reed switch sensor built into Door Latch 1, a second Reed switch built into Door Latch 2 and a normally closed contact on a PIR (passive infrared) movement sensor.
OUTPUT RELAY BEHAVIOR
There are three output relays on the control system. Relay 1 selects which door to lock. If Relay 1 is OFF then Door 1 electric latch is selected. If Relay 1 is ON, then Door 2 latch has been selected.
When Relay 2 is operated it applies 12V power to whichever door lock has been selected by Relay 1.
(This method is intrinsically safe. It is impossible for both doors to be locked simultaneously)
AUX RELAY OPTIONS
Relay 3 has a choice of functions depending upon the location of jumper JP2.
If JP2 is in position ‘A’, then Relay 3 contact is Closed whenever either door is locked. It can be used to switch 240VAC (5A max) to lights and/or an exhaust fan within the bathroom. In this way the lights and fan will activate automatically whenever the bathroom is occupied and deactivate after they leave. This contact will go OPEN Two Minutes after the room has been vacated to give extra time to operate the bathroom exhaust fan.
If jumper JP2 is in the ‘B’ position then Relay 3 behaves as an Alarm Warning contact. Relay 3 will pulse rapidly whenever a door is opened that is supposed to be locked. ie. Someone has overridden the door lock. This contact can be used to operate a warning lamp or buzzer in the room or elsewhere as an indicator that the occupant of one room has gained ready access to the second room via the joint bathroom.
TYPICAL WIRING ARRANGEMENT
ALTERNATIVE INSTALLATION METHOD
In some situations, such as laboratory rooms, a more basic form of interlock is all that is needed, where only one door may be used at a time. When any door is opened, all other doors have their latches energised and become locked. When all doors are closed, then all doors are unlocked. A simple circuit consisting of door latches and a 12V power supply is described within the viewable pdf file below.
Click on the link below to download this Product Information .
In some situations, such as laboratory rooms, a more basic form of interlock is all that is needed, where only one door may be used at a time. When any door is opened, all other doors have their latches energised and become locked. When all doors are closed, then all doors are unlocked. A simple circuit consisting of door latches and a 12V power supply is described within the viewable pdf file below.
Click on the link below to download this Product Information .
| sm108b_flyer.pdf |
| latch_drawing.pdf |
| simple_door_interlock_method..pdf |
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PRICING INFORMATION
SM108b Door Interlock System (includes SM108b unit, 2 x latches, movement sensor)
Qty 1-9 $475.00
Qty 10+ $420.00
SM108b Door latch only (12V working, normally unlocked, becomes locked when energised )
Qty 1-9 $125.00 ( Latch includes integral micro-switch, as shown above)
Qty 10+ $105.00
(last updated March 2012)
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PRICING INFORMATION
- Payment can be made to Alian Electronics via EFT or Pay Pal
- All prices in $AUD and do not include the cost of freight. (Click HERE to view the Freight Information page)
- When buying from within Australia add 10% GST
- (Overseas sales are GST Free, but depending upon local policy, you may need to pay tax/duty for goods to be released by your Customs)
- When buying from within Australia by Pay Pal, add 2.4% for Pay Pal transaction fee.
- When buying from Outside Australia by Pay Pal add 3.6% for Pay Pal transaction and currency conversion fee.
- (When buying from Outside Australia using Telegraphic Transfer ( TT ) the buyer will pay transaction fees with their bank.)
- Transaction details, Freight & other charges will be shown on a Proforma Invoice supplied to you before you pay.
SM108b Door Interlock System (includes SM108b unit, 2 x latches, movement sensor)
Qty 1-9 $475.00
Qty 10+ $420.00
SM108b Door latch only (12V working, normally unlocked, becomes locked when energised )
Qty 1-9 $125.00 ( Latch includes integral micro-switch, as shown above)
Qty 10+ $105.00
(last updated March 2012)
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