Potential Savings when Choosing Amperometric Chlorine Measurements over online DPD
For many years, online DPD measurement of free chlorine has been seen as the most reliable, and best, way to ensure an accurate measurement of free chlorine in water. However, over the past 20 years, huge advances have been made in amperometric measurements with little or no advancements made in DPD measurement technology, so is…
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Using Open Flow Cells with Membraned Sensors
Membraned sensors come with many advantages over non-membraned sensors such as higher resolutions, fewer interferents and a greatly reduced effect of flow rate changes. These advantages can make a huge difference to the bottom line, particularly if the cost of the chemical being dosed is quite high. For free chlorine sensors, using a membrane can…
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Multi-Parameter Systems
Process Instruments supply CRIUS®4.0 and CRONOS® controllers with sensors for many single parameter systems like chlorine and pH but did you know that… …Pi’s CRIUS®4.0 and CRONOS® controllers both allow the connection of multiple sensors? …Pi’s multi-parameter systems can save you space onsite, are easy to use and have a number of communications options available?…
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Seawater Chlorination
Did you know that… …when you dose chlorine into seawater it is bromine that does the disinfection? …DPD 1 measures free chlorine or total bromine and not free bromine? The chemistry of the chlorination of seawater is more complex than many people realize and, although the measurement of chlorine residuals is possible in seawater (and…
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PID Auto-Tune – why it might not work for water processes
Process Instruments (Pi) are increasingly seeing water engineers and technicians relying on their PLC’s PID auto-tune feature. Many are becoming frustrated that the auto-tuners are unreliable when it comes to water processes. Sometimes the auto-tuned PID settings work, but then something changes in the process and the PID control no longer functions correctly. In this…
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Measuring Free Chlorine in the presence of Chlorine Dioxide
Measuring free chlorine and chlorine dioxide independently of each other is quite a challenge, given their chemical similarities. Many sensors struggle to differentiate between the two measurands, but did you know that… …many chlorine probes suffer from interference in the presence of chlorine dioxide? …DPD1 will read both chlorine and chlorine dioxide? …you can have…
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ORP for the Removal of Residual Chlorine using Sodium Bisulphite (or other reducing chemicals)
Chlorine is often removed from a process and there are a number of potential reasons why. Chlorine might damage an RO membrane or turn food brown in an unsightly manner. Chlorine removal presents several challenges to instrumentation manufacturers and engineers, but did you know that… …ORP can effectively control sodium bisulphite dosing to remove chlorine?…
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Zero Chlorine
If you’ve ever had an application that uses Reverse Osmosis (RO), such as in a renal ward, you probably understand the damaging effect that chlorine can have on RO membranes, but did you know that… …Pi has a security system that can alert you to any free chlorine present and can actually prevent the contaminated…
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PeraSense for Online Peracetic Acid Monitoring
Why is there a requirement for peracetic acid (PAA) online monitoring? Common disinfectants such as chlorine and chlorine dioxide have been used effectively in water applications for over a century. Some industries however have looked to use other alternatives which have fewer or no considerations of safety and which don’t require residual or by-product removal. One of these…
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TurbSense® for Online Turbidity Monitoring
Why does the market need another turbidity sensor when so many are already available? The simple answer to this question is that current sensors cannot overcome all of the common issues relating to online turbidity measurement. Pi’s patented MutoLux® turbidity measurement system revolutionises turbidity measurement and has a solution for all these problems. Did you know…
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