2
S
PECIFICATION
Approximate Dimensions:
Height Width Depth Weight
Limpet 120mm 95mm 35mm 356 grams
Keep 130mm 105mm 30mm 136 grams
Input Voltage Range: 10.5Vdc to 14.0V
I
NSTALLATION
The model E20 Limpet Set (1 Limpet and 1 Keep) should be installed by adopting the following
procedure:-
1. Fix the keep to the surface of the equipment to be protected, using a contact adhesive
and/or three 2BA countersunk screws of suitable length. The keep can be mounted in
any attitude.
2. Remove the cover from the limpet, by unscrewing the four 4BA x head screws.
3. Thread the wires of the alarm loops through the grommet provided in the cover, and
make the necessary connections to the terminal block. The connections should be
made as shown on the PCB, ensuring that the power supply leads are connected the
correct way round. The reset can be either positive or negative triggered and should
be connected to the appropriate positive or negative reset point.
S
STEM
O
PERATION
The limpet will enter its alarm condition when either of the conditions below are met:
•Any of the reed or tamper switches are opened.
•The internal temperature rises above 60°
•An impact or vibration triggers the vibration detector.
The alarm signal has a minimum length of 1 second. However, if the tamper lasts for more that a
second, the alarm signal will last as long as the tamper. The LED illuminating indicates alarm
detection. The LED remains on until a reset signal is received. The LED will initialise off at power
on, and the remote alarm will activate for more than 1 second, as a confidence feature. The unit
will trigger an alarm even when the LED is illuminated.
The vibration detector sensitivity adjustment is provided by means of the pre-set potentiometer
R1 (top right hand of PCB). Turn anticlockwise for maximum sensitivity.
www.acornfiresecurity.com
www.acornfiresecurity.com
