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Old 01-03-2013, 12:31 AM   #11
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Originally Posted by P-J View Post
OR - perhaps I just do not understand the wiring layout of the sensors. I've not been able to find a single circuit diagram for them.
P-J
P-J, thanks for the feedback (sorry about the PM)! I've attached the spec sheet for the sensors below. It is NO operation mode with power on the input to the sensor and power on the output to trigger the SPDT relay. Or, that is the hope!


File Type: pdf Liquid Level Sensor.pdf (212.9 KB, 30 views)
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Old 01-03-2013, 12:36 AM   #12
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I love the idea of using these sensors on a sight glass! I'm not getting the logic of the wiring diagram, though. It seems like there's three possible states with the two sensors, and the desired behavior is:
1. Water below both sensors --> Sparge pump should be on
2. Water above both sensors --> Sparge pump should be off
3. Water between the sensors:
--> Sparge pump should be on if last state was (1)
--> Sparge pump should be off if last state was (2)

In your diagram it looks like you're planning to wire the switches in parallel, so the pump relay is engaged whenever either switch senses fluid. Is that right? If so, it wouldn't give you the history dependent behavior you're wanting in state (3). In fact, I think your pump just be off in state (1) and on in state (2) or (3).

But I'm new to electronics, so take this all with a grain of salt.

EDIT: Ignore me (the electronics newbie) -- P-J is on the case!
NO No no....

All input within these threads is very valuable.

You pointed out some of my exact concerns. That is extremely important. I'm just one person and I do make mistakes in observations and in some of my thinking. As I've said many times before - "Getting old just plainly sucks!"

P-J


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Old 01-03-2013, 12:52 AM   #13
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All input within these threads is very valuable.
P-J
Agree 100%, thanks tophmck & P-J for feedback. Hell, I have a BSEE and run an electrical/photovoltaic contracting company, but scratch my head on some of this stuff.

My thinking is that since the sensors are NO operation, I would use two so they could toggle the relay (SPDT) and trigger the pump on/off.
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Old 01-03-2013, 01:11 AM   #14
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I think you might be able to use a dpdt relay to latch the relay on (pump off) at your max level and reset when you go below the min level sensor. Spdt will work with a single sensor and simple on/off mode.

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Old 01-03-2013, 01:29 AM   #15
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I think you might be able to use a dpdt relay to latch the relay on (pump off) at your max level and reset when you go below the min level sensor. Spdt will work with a single sensor and simple on/off mode.
DPDT relay with pump 110v on one set of NC contacts.

High level switch will energize 12v relay coil

2nd set of contacts will latch relay on by connecting 12v from NO to relay coil.

Low level switch will break the 12v feedback/latch when liquid drops below low level.

Use a 3-way switch to allow on/off/sarge modes for the pump.
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Old 01-03-2013, 02:34 AM   #16
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Ahhh, I was in the thought pattern of toggling back/forth the switch on DP.
Based on your input it would be:
http://www.mcmaster.com/#catalog/118/906/=kv9kn0
McMaster-Carr part #7266K43 which is a Spade-Terminal Relay DPDT, 12 DC Control Voltage via those sensors and pipe through 120V for the pump.

Already have the 3-way switch for the pump for on/auto settings.

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Old 01-03-2013, 03:01 AM   #17
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OK, I promise not to censor myself, P-J.

This seems like a really elegant solution, jCOSbrew. Can't wait to see how well these sensors work!

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Old 01-03-2013, 12:13 PM   #18
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This looks like a very good solution for sparging. One concern that I have is that there is flow through a pump even if it isn't running when there is a height differential in the liquid levels. Using the control for a solenoid valve and keeping the pump running continuously might be a better solution.

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Old 01-04-2013, 08:42 PM   #19
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The relay arrived today, so time to tinker.
Sheesh, no wiring diagram for the relay. Damn, something else to figure out (cryptic drawing on side of relay is murky).



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Old 01-04-2013, 08:59 PM   #20
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The relay arrived today, so time to tinker.
Sheesh, no wiring diagram for the relay. Damn, something else to figure out (cryptic drawing on side of relay is murky).
I used the same relay in an water top up devise i use to top up the water in my Areograrden when we go on vacation.

here are some directions on their build and it shows how to wire the relay with 12 volts
http://www.aquahub.com/store/media/TopitOffKitPremiumInstruxCompDec07.pdf


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