Are you spending a lot of money on pH sensors? Like most process instruments, proper installation and maintenance play a significant role in determining the effective life of your sensor. In this writeup we address the top four things you can do to extend the life of your pH sensors through proper maintenance. Continue reading
The SE 655 Memosens toroidal conductivity sensor is ideal for measurements in liquids with suspended solids and high conductivities. This corrosion resistant sensor is constructed of PEEK in a smooth, easy-to-clean design and comes with an integrated 3m cable. The SE 655 is highly accurate and has a low risk of contamination because of a large sensor opening.
The robust sensor design and construction, along with t... Continue reading
The bleaching process is very challenging for pH electrodes due to plugging and chemical attack. The pulp consistency can easily reach 10% and quickly plug the junction of the many pH electrodes. The pH range of the pulp changes drastically several times during bleaching. This alternating chemical process yields extreme pH values of around 3.5 in the chlorine dioxide (ClO2) stage and a value of around 11.5 during the c... Continue reading
The SE 554 Memosens pH sensor is ideal for use in liquids with suspended solids and high ionic strength. This low-maintenance sensor is constructed using Alpha pH glass, 2 open hole junctions & a solid polymer electrolyte with high KCl concentration. These features provide stable performance and long life in the most difficult applications.
The integrated NTC 30K temperature element assures that all pH measurements are accurat... Continue reading
Liquid analytical measurements in sugar refineries are challenging due to the processes needed to convert the sugar contained within the sugar beets into a concentrated liquid called thick juice.
Critical steps in the sugar purification process are 1st and 2nd carbonation. Continuous pH monitoring is needed to ensure the efficiency of the carbonation stage. Because of the potential for excess... Continue reading
Need a reliable pH measurement in boiler or RO water? As long as the conductivity of your measured medium is above 10µS/cm there is no reason to use a liquid-filled sensor. Gel-filled sensors provide a low-cost, low-maintenance alternative without compromising performance.Continue reading
The SE 558 Memosens pH sensor is ideal for use in high purity water. This low-maintenance sensor is designed for use in applications with a conductivity of >10 μS/cm. Constructed using Alpha pH glass, 3 ceramic junctions, and a KCl reservoir, the SE 558 is a great alternative to high-maintenance, liquid filled pH sensors. An integrated NTC 30K temperature element assures that all pH measurements are accurately compensated for the temperature... Continue reading
The SE 555 Memosens pH sensor is ideal for use in a wide range of applications. The sensor is designed to withstand extreme pH ranges, aggressive media, and applications requiring frequent CIP or SIP cleaning. An integrated NTC 30K temperature element assures that all pH measurements are accurately compensated for the temperature of the process media. The pressurized reference system, along with the Silamid reference electrode, help to ext... Continue reading
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.
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