Inertia sensors on Siemens system - lack of sensitivity?

leo738

Hello All,

I've wired up a 5300 Siemens system using PIR's & also inertia sensors. My issue is that inertia sensors seem very insensitive, i.e. to even get a pulse registered requires a very significant force & I doubt smashing a window register a gross event!

The setup I've used:

• The inertia sensors are HKC brand, Dual EOl (4k7) with reed sensors on the windows/ doors
• I've set the zones as alarm, analysed & experimented with various settings of gross & pulse (4 & all the way to 0)
• Set as Dual EOL 4k7
• Double knock is not selected

Testing I've carried out:

• Testing of MC, tampers & inertia sensors with a meter on each zone, open with any tamper open, 4k7 all closed & 9k4 with a MC open/ inertia sensor tested.
• Checked the Siemens 'Test/zone' & it shows 4k4 all closed. I Disconnected an inertia sensor (& closed the tamper switch) & view an 8K8 reading. (an inaccuracy on the panel??)

Am I missing something obvious??

Thanks,

Leo

leo738

Following the above I tried:

Changing the setup to no EOL
Wiring directly to the inertia sensor (i.e. skipping the reed/ MC)
Changing from the 'slim line' unidirectional HKC sensor to the traditional directional type inertia sensor.

The only improvement I noticed was changing the sensor type. The traditional barrel type inertia sensor seems to yield slightly greater sensitivity. Is this normal?

Leo

fred funk }{

How exactly are you testing the shocks?

leo738

Fred,

Basically with my hand! It's taken a alot of thumps to get any response from the sensors.

I've tested other alarms I've installed (& looked online at other people checking their alarms) & all I've only ever needed before was light taps. The doors & windows are particularly heavy & thick. Could this have a dampening effect on vibrations?

Leo

fred funk }{

Well for starters, generally shocks need more vibration than you think to trigger the alarm. Certainly if the windows are very sturdy that would have an effect on the sensors.

I would set the Pulse and gross to three and test the zone via test-zone monitor- zone number.

I would also change the default setting in the test menu of the internal sounder so you can hear when the zone trips.

I would also test with a blunt object like the handle of a screw driver.

leo738

Fred,

Thanks. I've set gross to 1 & pulse to 2. It gives a slightly more responsive system.

I've also set the alarm & then tried triggering it. It still seems quite unresponsive however.

Regards,

Leo

fred funk }{

leo738 wrote: »

Fred,

Thanks. I've set gross to 1 & pulse to 2. It gives a slightly more responsive system.

I've also set the alarm & then tried triggering it. It still seems quite unresponsive however.

Regards,

Leo

Leo.

I wouldn't recommend having them that low. You will be plaqued with false alarms.

Pulse counts the small taps and the gross is one single attack reading so you're asking for trouble with those settings.

Your expectation of how sensitive they should be might not be what they are designed to be.

Remember, they're designed to detect forced entry which will create a fair bit of vibration.

leo738

Fred,

Thanks. I'll adjust the pulse up to 3 but leave the gross where it is.

Regards,

Leo

kub

leo738 wrote: »

Fred,

Basically with my hand! It's taken a alot of thumps to get any response from the sensors.

I've tested other alarms I've installed (& looked online at other people checking their alarms) & all I've only ever needed before was light taps. The doors & windows are particularly heavy & thick. Could this have a dampening effect on vibrations?

Leo

Hi Leo,
Do you have a PSA Licence?