Tony Romano
New member
My probe reads 99.9 after calibration in 50ms solution.
I bet this is a bad sign!
I bet this is a bad sign!
Salinity probe error
- Thread starter Tony Romano
- Start date
AQD_ottawa
New member
when did you last clean it?
Matthias Gross
.Registered Member
I don't think it is cleaning problem. It seems he has this wrong reading since he calibrated, why should the probe become more dirty after this?
Tony,
did you perform the calibration exactly like required?
first probe in the air, then probe in solution?
what ADC-values are displayed in ProfiLuxControl at the salinity page?
Tony,
did you perform the calibration exactly like required?
first probe in the air, then probe in solution?
what ADC-values are displayed in ProfiLuxControl at the salinity page?
AQD_ottawa
New member
As per the instructions that come with the GHL salinity probe, in time the platinum probe requires cleaning, calibration solution is not strong enough to do this.
If the probe is dirty it can "stick" at a value, then when attempted recalibration can throw the reading out.
I had it on mine, ceaned, now works a treat.
If the probe is dirty it can "stick" at a value, then when attempted recalibration can throw the reading out.
I had it on mine, ceaned, now works a treat.
Tony Romano
New member
I cleaned with tooth brush same as other times I calibrated. I calibtated 3 or 4 times with same results.
Yes in the air and proper temp.
This morning the reading is back in range I would expect, however the reading is not stable. (dirty contact in connector?)
ADC1 21
ADC2 22
Yes in the air and proper temp.
This morning the reading is back in range I would expect, however the reading is not stable. (dirty contact in connector?)
ADC1 21
ADC2 22
AQD_ottawa
New member
As it is back in range but fluctuating I still would think contamination.
Try one of the following that is listed in the GHL sheet with the probe for cleaning
soak in warm soapy water to remove oil or grease contaminates.
If no go
soak for 30 mins in 30% sulphuric acid and detergent mix
My added advise on experience dealing with platinum probes, get an ear bud and rub with vinegar and then leave in fresh water, then recalibrate
Matthias may have other suggestions also
Try one of the following that is listed in the GHL sheet with the probe for cleaning
soak in warm soapy water to remove oil or grease contaminates.
If no go
soak for 30 mins in 30% sulphuric acid and detergent mix
My added advise on experience dealing with platinum probes, get an ear bud and rub with vinegar and then leave in fresh water, then recalibrate
Matthias may have other suggestions also
Tony Romano
New member
Ok - very good, thanks.
Matthias Gross
.Registered Member
ADC1 21
ADC2 22
-> very bad!
the first value is OK (this is the value "probe in air"), the second value should be something around 500 (this is the value for probe in solution)!
please do calibration again and watch the displayed "ADC"-values during calibration.
If the readings during calibration in the solution are still far away from approx. 500 then move cable and/or plug and check if the ADC-value changes then - maybe there is now a bad connection in the plug or cable. This may have happened while removing the BNC-plug (e.g. everything was unplugged for an update or something like that).
ADC2 22
-> very bad!
the first value is OK (this is the value "probe in air"), the second value should be something around 500 (this is the value for probe in solution)!
please do calibration again and watch the displayed "ADC"-values during calibration.
If the readings during calibration in the solution are still far away from approx. 500 then move cable and/or plug and check if the ADC-value changes then - maybe there is now a bad connection in the plug or cable. This may have happened while removing the BNC-plug (e.g. everything was unplugged for an update or something like that).
Tony Romano
New member
Ok - Damn thing seems clean as can be and same problem. I will do as you suggest and advise.
Thank you
Thank you
Tony Romano
New member
Same results - this problem started with no real movement of unit or wires. Is it possible there is an open on EX unit that maybe fixed with simply reseating connector to main board?
AQD_ottawa
New member
its all soldered connectors with anchorage legs so you would need some force to create a dry joint.
Tony Romano
New member
Not sure what you are telling me here. No? Most likely bad probe?
Matthias Gross
.Registered Member
I guess there is something wrong with the BNC-plug of the probe.
But this is not a very big deal. Do you know someone who is able to replace this BNC-plug? For example a computer guy?
But this is not a very big deal. Do you know someone who is able to replace this BNC-plug? For example a computer guy?
Tony Romano
New member
Humm - I did them 10 years ago. Don't you need a special tool?
Tony Romano
New member
Matthias - What is the gauge of cable? None of the local shops I've checked have BNC that small. I want to google it.
Matthias Gross
.Registered Member
this is no special size, just standard
don't worry about the small diameter of the cable, the crimping will work
don't worry about the small diameter of the cable, the crimping will work
AQD_ottawa
New member
Not exactly correct your problem was that you left yours stored dry for over six months checking back at messages, that will kill any probe. Not exactly a GHL fault that one
Tony Romano
New member
Problem was actually some build up on contact on probe, I could not see it with my old eyes! I took it to local pc shop and we did a continuity test, it passed. The tech saw the build up, i gave it a bath in vinegar and all is well. So Michael you were correct at first.
What brand Creetin?
What brand Creetin?
AQD_ottawa
New member
Oh yes the old vinegar trick
Am I allowed to say "I told you so" He he
:rollface:
Important thing is the probe works YEAH!!!!
Am I allowed to say "I told you so" He he
:rollface:
Important thing is the probe works YEAH!!!!
