Conductivity Probe Inputs

bluenoser337

Member
bluenoser337
Join Date
Apr 2003
Location
Nova Scotia
Posts
391
Hi: Replacing an old open board controller with a small PLC. I have a tank with 5 probes (1 reference and 4 different levels). I need an interface device that will give me a dry contact for each of the 4 levels, that I can connect to separate PLC inputs. Lots of relays available to "read" the probes and do simple "fill/empty" control, but I need something with 4 channels to simply give me a "yes/no" for the probes separately. Any suggestions welcomed!
 
What make and type of the original level probes ?

I know of Endress & Hauser type (silometer) that used to have a separate DIN rail converter to make the level signal.
The same type is still manufactured, now with the electronics in the probe head instead. There is also an analog level converter. Is that what you need ?
 
I don't know the make of the probes. All I know is that they stick in the side of the tank, are insulated from the tank, and work on conductivity between reference and levels. Only a single wire per probe.
 
I use a floatless relay from Omron 61F-GP-N2....uses 1 reference and 2 levels...they possibly make what you are looking for
 
I use a capacitive proximity sensor that senses liquid. It is not subject to grease build-up, yet only senses water. Has been fail-safe now for 2 years, replaced the old sticky float system I had.
 
wherever possible I use a D/P transmitter to replace probes for more accurate control
 

Similar Topics

R
Recommendations for tank-mounted conductivity probe
I've been asked to build a "simple" salinity monitor / controller for a chilled brine system. To simplify things, the owner prefers a tank-mounted...
Replies
4
Views
1,940
mister x
M
S
Good Paperless Recorder for Flow, Ph, Conductivity?
Hi All, We are looking for a new paperless recorder, our current ABB SM1000 is on its way out, the screen is difficult to see. There is a long...
Replies
13
Views
2,549
seekon
S
ceilingwalker
Conductivity control help
Hello, I have a Suntex EC-410 Conductivity controller that feeds a 4-20mA signal back to a compactlogix. I have the manual for this device but no...
Replies
4
Views
1,325
parky
P
T
Help converting Conductivity units
Hi Guys I need a bit of help here with my math! I have to measure the conductivity of caustic in a line. Now what I have been given by the...
2
Replies
15
Views
3,563
spaderkung
S
Steve Bailey
Oakton Conductivity meter
I'm trying to get the measured conductivity from an Oakton CON2700 conductivity meter into a PLC. The unit has an RS232 output for a printer...
Replies
2
Views
2,347
BryanG
B
Back
Top Bottom