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
 


------------------------------------------------------------------------

------------------------------------------------------------------------

 

Homepage:  http://www.flyrotary.com/
Archive:   http://lancaironline.net/lists/flyrotary/List.html