Dual-Tec PIR's - getting insensitive on walk test

[polybear01]

Hi,

I have a couple of Pyronix Equinox E dual tec PIR's that have been great; however I'm now finding that they are becoming less sensitive during walk test (but no false alarms though).  In fairness they're 20+ years old....

Is such behaviour the norm, and if so I've been looking at Pyronix KX15DT's - are these a worthy replacement?

One last question - the Equinox E states a relay contact via a 4.7 ohm series resistor, yet the KX15DT incorporates selectable alarm resistor values of 6K8, 5K6, 4K7 &1K & tamper values of 5K6, 4K7, 2K2 and 1K.  So what should I select? My panel tech spec. quotes a "Zone Activation Resistance" of 2Kohms (minimum)" if that's of help.

 

Many thanks in advance

polybear01

[sixwheeledbeast]

I have known older Pyronix sensors to decrease there coverage with age so it is a good idea to consider upgrading.

I imagine most DT's would be suitable replacements. If your panel in double pole you are likely not to need selecting of any resistance and wire like for like.

[polybear01]

Many thanks; the zone type is described as "Normally closed loops which activate when opened or connected to 0 volts from dc power supply" - nothing about double pole though?

polybear01

[MrHappy]

2 minutes ago, polybear01 said:

"Normally closed loops which activate when opened or connected to 0 volts from dc power supply" - nothing about double pole though?

 

same  thing

9 minutes ago, sixwheeledbeast said:

sensors to decrease there coverage with age

 

I assume the range has pot on it?

 

Adjusting pot min to max a dozen times will probably see it right ?

[polybear01]

Many thanks for the tip - it's sorted one but the other appears dead, so a new one (or possibly 2, bearing in mind postage costs being the same for 1 or 2, and they're only 20 quid each anyway) is needed.

polybear01

 

[james.wilson]

iirc Pyronix had issues with the lens degrading. You used to be able to get replacement lens

[sixwheeledbeast]

I have tried messing with the pot before but you seem to only get a few extra years out of them.

Also been to a good few that have stuck active with the circuit board red hot, more of a reason to get them replaced.

 

[polybear01]

This is the cheapest I've found, once delivery is included - unless anyone can advise otherwise?

https://www.citysecuritysystems.co.uk/pyronix-dual-tech

polybear01

 

[MrHappy]

1 hour ago, polybear01 said:

Many thanks for the tip 

 

Just a temp fix, 

[MrHappy]

30 minutes ago, james.wilson said:

iirc Pyronix

 

I really like controls with a castle heritage, but there a great commercial success rather than best product.