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Try this eBay link for optical liquid level sensors:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7514808759&rd=1&sspagenam
e=STRK%3AMEWA%3AIT&rd=1
If the link doesn't work, go to ebay and type "els-1100" or "gems level
switch".
These were discussed awhile back on this list. I just wrote the seller to
find he has 30 and would probably sell all at sale price. They list for
about $90.00 each. They went unpurchased on his last listing. Before that
they went for $6.50.
Specifications:
Materials
- Housing and Prism Polysulfone or Nylon
Operating Pressure 0 to 150 PSI, Maximum
Operating Temperature* 0?F to 176?F (-17.8?C +80?C)
Current Consumption 18 mA, Approximately
Output TTL/CMOS Compatible. Open Collector Output May Sink 40 mA up to
30 VDC.
Repeatability ?1 mm
EMI Susceptability Meets (MIL-STD-461B Part 2 Modified) Specification of
10 V/M for Frequency Range 30 to 1000 Mhz (Except 609 Mhz = 9 V/M and 679
Mhz = 7.5 V/M).
Electrical Termination
- Other Mounting Type Lead Wires, 22 AWG, PVC Jacketed, 12" to 14"
Extended
- Other Mounting Type 25 Foot Cable, 22 AWG, PVC Jacketed
* These switches are not for use in freezing liquid
GEMS web site: http://www.gemssensors.com type "els-1100" in search window.
They should work for fuel level warning lights, to trigger a tranfer fuel
pump relay, or water level low indicators (overflow tank only as high temp
limit is low). Model for sale is 10-28V. I don't understand the "dry"
probe (normally open circuit when wet, they closed when dry? or other way
around?).
Chris Sargent
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