Tweet Ultrapen PT3 ORP tester Though the measurement of free chlorine concentration is often indicated for the disinfection of water and disinfectant byproduct control, there is a better way. Because free chlorine works through oxidation, ORP instrumentation can be used to monitor and control its effectiveness. ORP measures the actual oxidation power of the solution, […]
TweetYears ago, high purity water was used only in limited applications. Today, deionized (Dl) water has become an essential ingredient in hundreds of applications including: medical, laboratory, pharmaceutical, cosmetics, electronics manufacturing, food processing, plating, countless industrial processes, and even the final rinse at the local car wash.THE DEIONIZATION PROCESSThe vast majority of dissolved impurities in […]
Years ago, high purity water was used only in limited applications. Today, deionized (Dl) water has become an essential ingredient in hundreds of applications including: medical, laboratory, pharmaceutical, cosmetics, electronics manufacturing, food processing, plating, countless industrial processes, and even the final rinse at the local car wash.
THE DEIONIZATION PROCESSThe vast majority of dissolved impurities in modern water supplies are ions such as calcium, sodium, chlorides, etc. The deionization process removes ions from water via ion exchange. Positively charged ions (cations) and negatively charged ions (anions) are exchanged for hydrogen (H+) and hydroxyl (OH-) ions, respectively, due to the resin’s greater affinity for other ions. The ion exchange process occurs on the binding sites of the resin beads. Once depleted of exchange capacity, the resin bed is regenerated with concentrated acid and caustic which strips away accumulated ions through physical displacement, leaving hydrogen or hydroxyl ions in their place.
DEIONIZER TYPESDeionizers exist in four basic forms: disposable cartridges, portable exchange tanks, automatic units, and continuous units. A two-bed system employs separate cation and anion resin beds. Mixed-bed deionizers utilize both resins in the same vessel. The highest quality water is produced by mixed-bed deionizers, while two-bed deionizers have a larger capacity. Continuous deionizers, mainly used in labs for polishing, do not require regeneration.
TESTING Dl WATER QUALITYWater quality from deionizers varies with the type of resins used, feed water quality, flow, efficiency of regeneration, remaining capacity, etc. Because of these variables, it is critical in many Dl water applications to know the precise quality. Resistivity/ conductivity is the most convenient method for testing Dl water quality. Deionized pure water is a poor electrical conductor, having a resistivity of 18.2 million ohm-cm (18.2 megohm) and conductivity of 0.055 microsiemens. It is the amount of ionized substances (or salts) dissolved in the water which determines water’s ability to conduct electricity. Therefore, resistivity and its inverse, conductivity, are good general purpose quality parameters.
Because temperature dramatically affects the conductivity of water, conductivity measurements are internationally referenced to 25°C to allow for comparisons of different samples. With typical water supplies, temperature changes the conductivity an average of 2%/°C, which is relatively easy to compensate. Deionized water, however, is much more challenging to accurately measure since temperature effects can approach 10%/°C! Accurate automatic temperature compensation, therefore, is the “heart’ of any respectable instrument.
RECOMMENDED MYRON L METERSPortable instruments are typically used to measure Dl water quality at points of use, pinpoint problems in a Dl system confirm monitor readings, and test the feed water to the system. The handheld Myron L meters have been the first choice of Dl water professionals for many years. For two-bed Dl systems, there are several usable models with displays in either microsiemens or ppm (parts per million) of total dissolved solids. The most versatile instruments for Dl water is the 4P or 6PFCE Ultrameter II™, which can measure both ultrapure mixedbed quality water and unpurified water. It should be noted that once Dl water leaves the piping, its resistivity will drop because the water absorbs dissolved carbon dioxide from the air. Measuring of ultrapure water with a hand-held instrument requires not only the right instrument, but the right technique to obtain accurate, repeatable readings. Myron L meters offer the accuracy and precision necessary for ultrapure water measurements.
Inline Monitor/controllers are generally used in the more demanding Dl water applications. Increased accuracy is realized since the degrading effect of carbon dioxide on high purity water is avoided by use of an in-line sensor (cell). This same degradation of ultrapure water is the reason there are no resistivity calibration standard solutions (as with conductivity instruments). Electronic sensor substitutes are normally used to calibrate resistivity Monitor/controllers.
Myron L Meters carries a variety of inline instruments, including resistivity Monitor/controllers designed specifically for Dl water. Seven resistivity ranges are available to suit any Dl water application: 0-20 megohm, 0-10 megohm, 0-5 megohm, 0-2 megohm, 0-1 megohm, 0-500 kilohm, and 0-200 kilohm. Temperature compensation is automatic and achieved via a dual thermistor circuit. Monitor/controller models contain an internal adjustable set point, piezo alarm connectors and a heavy-duty 10 amp relay circuit which can be used to control an alarm, valves, pump, etc. Available options include 4-20 milliamp output, 3 sensor input, 3 range capability and temperature. Internal electronic sensor substitutes are standard on all Monitor/controllers.
Sensors are available constructed in either 316 stainless steel or titanium. All sensors are provided with a 3/4” MNPT polypropylene bushing and 10 ft./3 meters of cable. Optional PVDF or stainless steel bushings can be ordered, as well as longer cable lengths up to 100 ft./30 meters.
The following table briefly covers recommended Myron L meters for Dl water applications.
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Tweet New Ultrapen Resources New Ultrapen Resources YouTube, Myron L Meters Blog, and Product Pages At Myron L Meters, we’ve been busy lately updating our YouTube Channel to bring you the latest product overviews, calibration, care and maintenance, and product features videos. We’ve been keeping them short and focused because we know you’re busy. We’re […]
Tweet Reverse Osmosis RO Meter – RO-1: 0-1250 ppm with color band RO Meters The choice of professionals for years, this compact instrument has been designed specifically to demonstrate and test Point of Use (POU) reverse osmosis or distillation systems. By measuring electrical conductivity, it will quickly determine the parts per million/Total Dissolved Solids […]
Tweet Myron L Meters Improved FAQ FAQ pages should be a simple, and quick, way to share answers to common questions held by visitors and customers. A good FAQ page should always be helpful to us and our customers.Our new FAQ section will feature straightforward answers, organized video links, links to blog posts, and site […]
Tweet Using MyronLMeters.com Stay up-to-date with an ever-changing world of water treatment regulations, industry events, news, and science at MyronLMeters.com. We believe that a strong, well-informed water industry network is essential. We’ve put together user-friendly pages for water treatment professionals with science updates, networking, news, government resources, associations, and publications for both North American and […]
Tweet Where You Can Find us How to Find Myron L Meters You’ll find us in some of the largest dialysis clinics in America. We’re testing some great pools. We’re testing soil on the farm. We’re helping keep your drinking water clean. We’re at NASA’s Marshall Space Flight Center. And we’re always here when you […]
TweetUltrapen PT2 product review. Myron L Meters presents a review of the Ultrapen PT2 that measures pH. In this video, we cover the steps for measuring pH, changing the temperature setting, changing the pH measurement mode, and overall features.Order the Ultrapen PT2 here: http://www.myronlmeters.com/Myron-L-PT2-Ultrapen-Multiparameter-pH-temperature-p/dh-up-pt2-ss.htm
Order the Ultrapen PT2 here: http://www.myronlmeters.com/Myron-L-PT2-Ultrapen-Multiparameter-pH-temperature-p/dh-up-pt2-ss.htm
Tweet how to maintain and clean free chlorine sensor for the ultrapen pt4 Ultrapen PT4 Free Chlorine Pen MAINTENANCEI. Routine Maintenance1. ALWAYS rinse the FCE sensor with clean water after each use.2. ALWAYS replace the soaker cap half filled with Sensor Storage Solution to prevent thesensor from drying out after each use.3. Do not drop, […]
MAINTENANCEI. Routine Maintenance1. ALWAYS rinse the FCE sensor with clean water after each use.2. ALWAYS replace the soaker cap half filled with Sensor Storage Solution to prevent thesensor from drying out after each use.3. Do not drop, throw, or otherwise strike the PT4. This voids the warranty.4. Do not store the PT4 in a location where the ambient temperatures exceed its specified Operating/Storage Temperature limits.
II. Battery Replacement The PT4 display has a battery indicator that depicts the liferemaining in the battery. When the indicator icon is at 3 bars, the battery is full. When the indicator icon falls to 1 bar, replace the battery with an N type battery.
1. In a clean/dry environment, unscrew the pen cap in a counter-clockwise motion.2. Slide the cap and battery housing out of the PT4.3. Remove the depleted battery out of its housing.4. Insert a new battery into the battery housing oriented with the negative end touching the spring.5. Align the groove along the battery housing with the guide bump inside the PT4case and slide the battery housing back in.6. Screw the PT4 cap back on in a clockwise direction. Do not over tighten.
III. Sensor Cleaning (additional sensor cleaning methods at www.myronl.com) Cleaning the sensor: The Myron L Company recommends cleaning your sensor every two weeks, however this depends on application and frequency of use. Indications of a dirty sensor are slower and/or erroneous readings.There are three critical components in your PT4 sensor; a very sensitive glass pH sensor bulb, a platinum ORP electrode, and a temperature sensor encapsulated in a small glass noid. Use extreme caution when cleaning your PT4 sensor.To clean your sensor, select one of the following methods:• Basic Cleaning: Using a solution made of dish soap mixed with water and a cotton swab, gently clean the inside of the sensor body and platinum electrode, rinse thoroughly with clean water, then recondition the sensor.• Cleaning the pH Sensor Bulb: If the sensor becomes dirty, clean the sensor surface with an isopropyl soaked cotton swab. Then rinse thoroughly with clean water.• Deep cleaning the platinum ORP electrode: Using the ORP electrode cleaning paper and water, gently clean the platinum electrode, rinse thoroughly then recondition the sensor.To recondition the sensor: Rinse the sensor thoroughly with clean water, then allow it to soak in Storage Solution for a minimum of 1 hour (for best results allow the sensor to soak in Storage Solution overnight).
IV. FCE Sensor ReplacementCAUTION: Only Remove/Replace the FCE sensor in a CLEAN and DRYenvironment!To remove the FCE sensor: Remove the soaker cap; make sure the PT4 (including the FCE sensor) is clean and dry.Loosen the battery tray (to allow pressure equalization).Then firmly grasp the FCE sensor body and slowly pull the FCE sensor out.To install a new FCE sensor: Line up the alignment tabs on the FCE sensor with the alignment slots on the PT4 unit. Gently push the FCE sensor into position, then close the battery cap.
You will need: RPT4 Replacement FCE Sensor (with instructions)
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