Sorry but this is not correct all the herpstats are proportional they do not make an on off Tstat. The chart at the bottom lists them all.Originally Posted by jfaria1891
http://spyderrobotics.com/home/products.html
The intro does not have lighting controls (sun set rise), pulse proportional (it is only dimming proportional and cannot be changed) run humidity controls, trigger external events, and most critical does not have a mechanical relay.
the relay adds two things they tend to close when things mess up (needs to be help open so the default is off) this means it is likely to fail off over on. The higher models allow a set point and then a choice of when the alarms kick on over and under. The higher models allow the relay to kill the power on just over (like every tstat does) or on any alarm over or under. this protects against a pulled loose probe.
The use of a secondary T-stat (aka failsafe) protects against a primary failure or a primary probe being pulled free. The herpstat 1,2, and 4 all make the use of a failsafe more questionable as they have built in protection against the very things a failsafe protects against. I might still use one but the reasons for it become complete failure of the relay and triac controller. It is unlikely both would fail at once unless a catrostrophic event occurs (massive power spike) that is likely to fry the failsafe too. that said I personally still have a failsafe on my HS4 I would be devastated if anything happened to my animals that I could have easily prevented.
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