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Time Delay Relay

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luxuryinn

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I am trying to fill water to a hot tub. I have this switch mounted at the desired level.

liquid float switch water level sensor(stainless steel) - eBay (item 130344525090 end time Nov-21-09 06:01:44 PST)

An intermatic D17 timer turns on every two hours for 7 minutes, supplys power to a 24vac transformer to switch and solenoid valve.

When the water is about to fill the switch bounces due to waves and thus shutting on off the valve every 4-5 seconds and has "hammering effect".

What kind of relay can I use to turn off the valve only when the switch is off for atleast 30 or more seconds.
 

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