Residual Chlorine Analysers – Auto-Flushed with Success
Residual chlorine monitors and indeed, ozone monitors, pH meters and chlorine dioxide analysers have all been around a long time and it would seem unlikely that they could be improved upon greatly ……. but for some applications they have!
In 2007 a paper mill approached Process Instruments (UK) Ltd (Pi) with a problem. They had a de-inked stock that they measured pH in to control a chemical addition. The problem was that their pH sensor was coating with ink that set hard on the glass. The pH sensors were unreliable a short time after replacement and the cost of replacing the sensors monthly was prohibitive. Following a detailed survey and discussion with the customer Pi proposed an auto-flushing device that would flush the pH sensor with warm, soapy water regularly enough to prevent rather than remove build up of ink. Two years after installation the same pH sensor continues to give reliable results with the CRIUS® chemical addition.
The CRIUS® Autoflush is controlled by the analyser where user variables adjust the flush time, frequency and signal hold time.
Fortunately not all cleaning requirements are so tough and via a ‘customer consultation’ exercise (we asked them!) Pi discovered that the need to keep sensors clean is far greater than previously imagined. Since 2006 Pi has shipped approximately 50 autoflush units all using potable water to keep various sensors clean under varying conditions. Some of the applications that have benefitted from a CRIUS®
Autoflush are: * pH sensor in a de-inking plant
* free chlorine sensor in white water in a paper plant * chlorine dioxide sensor in a food plant * pH sensor in an industrial chemical plant
If you have an application where your sensors require excessive maintenance or where the sensors need to be replaced too often, visit
www.processinstruments.net, or search for CRIUS®
Autoflush on YouTube to watch a video of the autoflush working!
Pi has been providing instrument solutions since 1998 and supplies through Distributors, under Private Label/OEM agreements and to End Users within the Water, Waste, Chemical, Paper, Pool and Leisure industries. With offices, a laboratory and new manufacturing facilities in Burnley, Lancashire, Pi operates globally with customers in Europe, America and the Middle East, including; Technostar (Egypt), Scottish Water (UK), Crow Wood Leisure (UK), Northern Ireland Water (UK), and Chemtrac (America). More recently Pi has received awards for innovation and has quadrupled its turnover in three years.
Reader Reply Card no 238
New Low Cost Titanium Water Level Instruments In-Situ®
100 analyser not only controlling the pH sensor, but providing the PID control for the
announce a new line of low-cost, titanium water level instruments. The durable, corrosion-resistant Rugged TROLL instruments monitor and record changes in water level, pressure, and temperature.
Rugged TROLL instruments withstand harsh conditions and can be used to monitor groundwater and surface water levels, coastal environments, landfills, flood events, storm surges, and more. Additionally, these instruments can be used to automate crest-stage gages. Two versions of the Rugged TROLL instrument are available.
The Rugged TROLL®
data access via a telemetry system, PLC system, PC, or RuggedReader® 200 can be deployed on suspension cable. The Rugged TROLL®
200 instrument with direct-read cable is designed for applications that require real-time handheld PC. If needed, the Rugged TROLL Com device is the communication interface
between a Rugged TROLL 200 instrument and a PC or RuggedReader handheld PC. The Rugged TROLL®
to a PC or RuggedReader handheld PC. These non-vented (absolute) instruments are compatible with In-Situ Inc.’s user-friendly Win-Situ® 5 software platform, which simplifies
programming and data downloads. For optimum accuracy and to correct for barometric pressure changes, the titanium Rugged BaroTROLL® instrument can be deployed along with a Rugged TROLL instrument. The Rugged BaroTROLL monitors and logs barometric pressure.
Reader Reply Card no 239 New Stationary Sampler For Liquid Media
The Liquistation CSF48 automatic stationary sampler from Endress+Hauser (UK) takes liquid samples from process streams, stores them in plastic or glass bottles for sample preservation and later analysis, and can perform up to two on-line analyses at the measuring point. Using Endress+Hauser’s Memosens sensors, measurements available include nitrates, conductivity, oxygen, pH or ORP, and turbidity. Other sensors are available on a custom basis. The sensors have 4-20mA outputs.
The Liquistation CSF48 can serve as a stationary sampler for fully automated removal and temperature- controlled storage of liquid media. It can also be configured with sensors for use as a measuring station in municipal and industrial sewage treatment plants, laboratories and water conservancy boards, or industrial processes.
An integrated data logger records analyser values, temperature of the samples, time of sampling, etc. The
operator interface has an LCD display, menu-guided operations, four operating keys, Field Data Manager software, and an interface to a PC for transmitting digital data. The system has two digital inputs, two analog inputs, two analog outputs, a cleaning function and an alarm relay. Add- on modules allow the Liquistation to be upgraded from one channel to multichannel measurements.
Sampling is accomplished with a vacuum or peristaltic pump, and the CSF48’s controller distributes the sample to the appropriate bottle. Sample bottles are kept in temperature-controlled storage, in a two-door housing for reliable temperature regulation. Dual-bottle trays make it easy to retrieve, replace and transport samples to the lab. Bottles are available in sizes from 1 liter to 30 liters, in plastic or glass. All parts that transport liquid (distribution arm, dosing system, distribution plate etc.) can be removed and cleaned easily without the need for additional tools.
Using the operator interface or the PC, a user can set up sampling procedures ranging from simple timed programs to event-driven programs. Up to 24 sampling programs can be active simultaneously. Sampling control can be in proportion to time, volume or flow. A sampling table makes it possible for users to program the bottle assignment, time interval and sample volume. Signals for external control can be connected via the two analog inputs and two digital inputs in the standard version of the product.
Conductivity or capacitance sensors, depending on the process liquid, are used to detect levels when dosing the samples. Multiple sensors also detect fouling and sensor failure, thus preventing pump failure. Self-learning software guarantees that the sample volume remains constant, so the user does not have to enter suction height or suction line length.
Reader Reply Card no 240 Reader Reply Card no 241 100 instrument is intended for long-term deployments that require minimal data access. Users deploy the Rugged TROLL 100 on suspension cable. Upon retrieving the instrument, users download data via a docking station
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