pH is monitored at the filler in each packaging line, right before the product is bottled or canned. Downtime is unacceptable and costly.
Being the final quality assurance measurement, high precision is required. Any drift, delayed response, or inaccuracy must be immediately addressed through calibration or sensor replacement.
Typical contributors to unreliable sensor performance are:Moisture in the sen... Continue reading
The CL-90 electro-pneumatic cleaning system is a cost-effective tool that helps address pH, ORP, and dissolved oxygen sensor performance issues in processes containing suspended solids. When paired with the Stratos Evo transmitter and Sensogate WA 131 pneumatic retractable holder, the CL-90 provides a compact engineered solution for the automat... Continue reading
The slurry of a corn mash tank contains liquids and fine solids particles. The thick slurry can quickly plug the junction/diaphragm of a pH sensor causing it to drift. This often requires frequent maintenance to clean the junction and recalibrate the sensor. In some cases the sensor is just replaced with a new one. Removing a pH sensor by hand from the process can be dangerous due to high temperatures and pressures.... Continue reading
The SE 515 Memosens pH sensor is ideal for use in water and wastewater treatment applications.
The sensor is designed to withstand plugging media, low temperatures, and to maintain a reliable measurement in low-ionic media. An integrated NTC 30K temperature element assures that all pH measurements are accurately compensated for the temperature of the process media. The low price of this sensor, along with the integration of Memosens techno... Continue reading
The raw water inlet is an important point in the water treatment process. Reliable pH and ORP measurements are necessary for proper operation of the facility. Raw water comes from storm drains, rivers, ponds, and lakes and contain a variety of contaminants. The pH and ORP sensors must be able withstand the process and still provide a reliable measurement.
The SE 515 Memosens pH sensor is specifically designed for use in water treatme... Continue reading
Remember when it was the screech under the hood or the burning oil smell that told you something was wrong with your car? What did we do before our cars told us it was time for service? We didn’t just get rid of our car and buy a new one, we brought it to the mechanic for evaluation and repair.
Today, we have clear diagnostics on our car’s dashboard that pinpoint the problem and indicate when it’s time for service. The same benefit is available with Memosens smart pH sensor te... Continue reading
Wet gas scrubber systems, also known as chemical scrubbers or gas scrubbers, are a type of air pollution control system that removes particles and hazardous gases from industrial exhaust streams.
The scrubber uses caustic liquids and injects them into the ventilation stack. This traps particulates and neutralizes the acid in the gas stream which then falls down to the bottom of the stack. The liquid that is collected is then sent to the wastewater treatment pla... Continue reading
Reverse Osmosis (RO) is a purification process which removes Total Dissolved Solids (TDS) in water by applying pressure to feedwater, forcing it through a semi-permeable membrane and allowing pure water to diffuse.
Conductivity is an important measurement for RO. Having the ability to measure a very low conductivity accurately is critical. Using a conductivity electrode is a common way to test RO water quality and membrane performance. Ultra pure water is... Continue reading
You should be asking, how accurate is my calibration procedure?
When there is an issue with pH measurement accuracy the blame is typically laid squarely on the sensor. However, calibration procedure and execution can be equally to blame. Below you will find some helpful hints that will assure you produce a repeatable, accurate calibration.
Before we dig in, let’s look at some of the key components to a successful calibration procedure:Fresh, clean calibration standards (Buffers) and rinsing solutionpH senso... Continue reading
Heat exchangers are used throughout many industrial plants to cool and convert steam into condensate. Once the steam has turned to condensate, it’s purity is high and conductivity value is low. Condensate contamination is very costly and affects efficient operation of the plant, or even worse, the contamination can cause environmental pollution. Monitoring the conductivity of the condensate leaving the heat exchanger is a reliable method to ensure the heat exchanger is functioning pro... Continue reading
Author: Shawn Little
Whether you are on 1st, 2nd, or 3rd shift, calibrating sensors seems to always happen at the worst time. It’s pouring down rain, snowing, +100º heat at noon, or below freezing in the middle of the night. I’d rather be in a climate controlled shop doing calibrations at a time I planned. Wouldn’t you? To me that’s a no-brainer!
In fact there are three no-brainers to me when it comes to pH calibrations:It’s easier to calibrate a pH sensor in the shop or lab
Conductivity measurements are used to control the CIP process as well as monitor the purity of the water used during rinsing cycles. Unreliable measurements can cause downtime or even worse, contaminated batches due to leftover product or detergents.
In the pH business, most measurement performance issues are blamed on the sensor. The sensor is the primary measurement element of the loop and is directly exposed to the process. Therefore, it must be the source of the problem, right?
In my experience, most pH problems are typically caused by something more rudimentary. It is these two factors that are oftentimes overlooked – sensor connections and cables.
In this post, I’ll be focusing on the cable. Continue reading
Depending on the feed entering the wastewater facility there can be a wide range of pH. Very low pH liquids can damage parts of the treatment system and potentially kill the good bacteria in the clarifier. Knowing in advance that low pH liquid is entering the process allows the operators to divert influent to protect the system. Because the SE 555 pH electrode is designed for dif... Continue reading
With traditional analog pH/ORP technology there are a number of challenges customers face.
An analog connection to the sensor is typically not submersible. M4 Knick’s digital Memosens® sensor connections are inductive. This is unlike all other digital and analog systems which use a conductive non-submersible connection. To get around this manufacturers will “pot” the cable into the sensor which forces the customer to completel... Continue reading
It has long been common practice when making pH/ORP, conductivity, and oxygen measurements that a fixed analyzer be mounted near the sensor. The analyzer serves several purposes. It is the display, the calibration tool, and the source of the output signals for data collection.
Analyzers represent a significant portion of the loop cost when making these measurements. The cost shows up as the following pain points:Limited functionality and flexibilityInstallationPurchase price of the analyzer
Many end-users of... Continue reading
An important component of steam boilers are the tubes. The pH of the boiler water is normally kept alkaline to facilitate the formation of a thin oxide layer on the tubes. This oxide layer acts as a protective barrier against corrosion. Sodium phosphate & sodium hydroxide are used to promote this oxide formation, but too much of these chemicals can cause problems. Accurate pH monitoring can help prevent these issues. M4 Knick’s SE 558 pH electrode... Continue reading
Author: Shawn Little
OK, OK, a toothbrush isn’t part of pH measurement (unless you’re using one to clean your sensors…not recommended!). However, inductive charging technology introduced by Braun's Oral-B electric toothbrush was a precursor to ground breaking improvements in in-line pH/ORP, oxygen, and conductivity sensors.
If you’re not using inductive technology for dental hygiene, it’s possible you’re using it for other portable device charging. This charging method has now become a... Continue reading
Author: Shawn Little
I’ve been on the road for the last four years talking about almost nothing but pH (my wife and kids would find that extremely boring…if they actually knew what I did for a living). During my time in planes, trains, automobiles, and in chemical plants, refineries, power plants, and what have you, I’ve learned something real. Making pH measurements is so painful that it no longer hurts. You know what I mean? It’s like that ache from an old injury, or just old age, that you know is there b... Continue reading
Cooling towers require an acid addition like sulfuric for pH adjustment to dissolve the calcium carbonate that builds up from high salts in the system. By dissolving the calcium carbonate it reduces scaling which helps the system efficiency. By monitoring the pH adjustment with a digital Memosens® sensor such as the SE 555, better corrosion control and earlier detection of process breakthrough is achievable.
As part... Continue reading
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