Trusting Sampler Results
My sampler has been taking continuous samples every 15 minutes for the last 7 years, so I’m pretty sure I can trust the results.
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Maybe but you should always calibrate your sampler every six months, just too be sure. Samplers have been know to fail.. every now and then.
They may be trustworthy to you but i would not rely on them. Samplers are equipment and need to be maintained and calibrated at manufacturer specified intervals(at a minimum).
The programing for sample collection seems very reliable, but you must perform manufacture recommended service and replacement of parts to be sure that the sampler is and will continue to perform to your expectations. Calibrations of the sampler should be done to verify that sample volumes are correct.
If you’re sampling domestic wastewater, then you need to be flow-compositing. If you don’t you’re not getting a representative sample. Failing to flow-composite makes it harder to meet your removal requirements because you’re oversampling at night when the strength is low and undersampling in the day when strength is high. Many samplers will take a 4-20 mA signal and calculate an appropriate sample volume or interval. Alternatively, many flow meters will output a contact closure at a user-set flow interval which can be used to trigger the sampler.
Insufficient information.
1. If the intake tubing is not in a continuous slope downward from sampler controller, water can pool up causing erroneous results.
2. If Intake tubing is exposed to sunlight, this can cause biological growth in the tubing causing erroneous results.
3. Are you sampling from the bottom where the sludge is? If yes, this can cause erroneous results
4. Are you trying to sample from too high? This will slow the velocity down below required levels and not keep solids in suspension causing erroneous results.
5. Are you using a clean bottle every day?
Your (automatic/continuous composite) sampler should be subjected to a regular maintenance schedule which should include sample volume calibrations/checks. In any regard, I believe that a national DMR/NPDES requirement for wastewater facilities is that your composite influent and effluent sampling must be flow-based, not time-based.
my sampler has a pump tube that whers out about every 2 to 3 months replace and calibrate then as needed
I have a service contract for my sampler – they take care of all the maintenance and calibration and I don’t have any trouble with it at all!
Evn the best automated samplers require maintenance and recalibration. Your sampling plan should include the requirement to maintain and calibrate the equipment on a reoccurring schedule and as needed.
I would not trust an auto sampler more than 1 month without calibration. Many things can happen to affect the sqample amount. The tubing will wear, the pump parts will wear causing inconsistant sample amounts, if flow paced, the electronics should be calibrated for accuracy. The main thing is to calibrate the sampler at least once a month.
Wouldn’t trust the results. Need to check it on a regular basis. One time it may be fine and the next moment something could happen.
Baised on the flow,inorder to collect representative sample, size and interval of sample may need to be adjusted.
It needs the proper calibration and service/cleaning to ensure continued service.
We calibrate our sampler quarterly.
Proper cleaning and regular calbration is the key.
Proper calibration and good cleaning goes a long way.
Calibration on a quartley basis .
Calibration and appropriate cleaning are the best approach.
Calibrate as needed
Never assume calibrate.
Calibration is important with all equipment!!
They may be trustworthy to you but i would not rely on them. Samplers are equipment and need to be maintained and calibrated at manufacturer specified intervals(at a minimum).
Calibration is necessary to make sure it’s sampling correctly.
You should always calibrate. We even go as far as to check the sample being pulled with a graduated cylinder.
would not hurt to calibrate
Pull out the stop watch and time a sample cycle to make sure.
Scheduled maintenance is a must, including regular changing of sampler tubing, cleaning of the sampling container, and testing the proper functioning of the sampler (is it flow or time based, you really need to make sure on a regular basis that everything is working properly.
Calibrate as per requirement
follow scheduled maintenance
calibration and cleaning are a must
Calibration on a PM Work order and this insures accuracy.
Never trust any instrument for indefinite time periods! Autosamplers should be tested weekly for accurate volumet delivery. This step is very simple, check the manufacturer’s recommendations.
calibration and checking sample on a regular basis