42 Water/Wastewater Reliable and Consistent Deep Well Measurement
Pulsar Process Measurement (UK) have supplied Scottish Water with non-contacting ultrasonic level measurement equipment that has resolved a particularly difficult deep well measurement issue, providing strong, consistent and reliable measurement of a narrow, 25metre deep sump.
Ayr Pumping Station is a substantial and strategically important pumping and flood defence station, so it is vital to the successful operation of the site that the level measurement equipment installed can be relied upon. Frustrated by the failure of another supplier’s equipment, Scottish Water approached Pulsar for a solution.
Pulsar have a good history at the site having supplied equipment for screen level control in 1999 that has continued to work well ever since, and for this application they
selected their Ultra 5 control unit married to a dB40 transducer, with a maximum measurement range of 40m on solids or liquids. The application itself presents a number of issues for the measurement equipment to overcome. The well itself is narrow, with a number of obstructions present in the path of the ultrasonic beam. Ultrasonic level measurement depends upon the ability of the device to bounce a pulse of sound energy off a ‘target’ and correctly identify the returning echo against the echoes from any other object that may be in range.
The equipment that had previously been in place had been prone to picking up these intrusions, giving false readings, high ‘spikes’ and therefore keeping the pumps running.
The Ultra 5 and dB40 combination worked immediately. The Pulsar system makes use of a sophisticated echo processing software system called ‘Datem’ that identifies and holds onto the correct echo in even the most difficult and awkward conditions, ensuring that the Pumping Station is able to operate to its maximum efficiency. Scottish Water conducted thorough testing over a six month period to make sure that the Pulsar equipment continued to perform well. As Jason Cramb of Scottish Water put it:
“We have moved from difficulty to delight with an absolute confidence in Pulsar’s equipment. Unlike some other manufacturers, Pulsar’s equipment genuinely does exactly what they claim it will do. On the strength of confidence built, we are installing more Pulsar equipment and will be removing other level measurement and control equipment which is now surplus to requirement and unnecessary.”
He added, "we have found Pulsar to be very helpful and for technical support our operational staff have nothing but praise and appreciation for Pulsar technical people.” Reader Reply Card No. 134
New UV-Vis Spectrophotometer for Water Analysis
The new 9100 UV-Vis Spectrophotometer from water analysis company Palintest (UK) offers accurate, full-power spectroscopic analysis for the lab environment. This addition perfectly complements the company’s existing and extensive range of photometric and sensor based testing instruments.
Capable of stand-alone or PC-
controlled operation using the dedicated Palintest Spectrophotometer Software, the instrument performs full spectral analysis across the 190 -1100 nm wavelength range, as well as kinetic measurements and both quantitative and photometric analysis modes for sample assays. Operation is intuitive and simple with the instrument supplied as a complete kit with all accessories required for ‘out of the box’ operation.
Seamlessly compatible with Palintest’s comprehensive range of reagent systems and accessories, the Palintest 9100 UV-Vis Spectrophotometer is ideal for water and environmental laboratories, educational institutions and industrial users who require high quality analytical performance at an affordable price.
Reader Reply Card No. 135
On-Site Measurement of Oil/Grease in Wastewater Helps Ensures Compliance with Discharge Permits
Determining total oil/grease levels in wastewater for compliance with governmental regulatory discharge permits is a worldwide problem facing numerous industries including chemical, oil and gas, and biofuels. To ensure compliance with discharge regulations and avoid fines for exceeding permit levels, more frequent wastewater measurements are necessary to determine the total oil/grease concentration. Wilks Enterprise (USA) manufactures portable infrared analysers that are specifically designed for easy, on-site measurement of oil/grease levels. They can be readily used by non-technical personnel and eliminate the need to wait for off-site lab results.
Based on field-proven infrared technology, the InfraCal TOG/TPH Analysers -- Model HATR-T2 or the Model CVH – depending on the solvent selected for the extraction process – provide accurate, on-site measurement of total oil/grease concentration in the wastewater. Typical analysis time is 10-15 minutes, including the extraction procedure. Measurement data obtained with the Model HATR-T2 correlates to EPA Method 1664 and with the Model CVH to ASTM Method D 7066-04 and EPA Methods 413.2 and 418.1.
Over 2,500 InfraCal TOG/TPH Analysers are currently in worldwide use measuring discharge levels into treatment centers, monitoring refinery and industrial plant wastewater
effluents.They provide the assurance that oil/grease content of the wastewater will meet various regulatory requirements.
Reader Reply Card No. 136
Analytical Quality Assurance Made Easy
Trust plays a central role in any analysis. All Merck (Germany) products are therefore subject to careful, functional approval testing. This does not, however, free users from implementing their own quality assurance measures in accordance with national laws and international standards. Using components and products as part of a professional concept for analytical quality assurance, Merck makes internal quality control processes (IQC) reliable and safe.
Quality assurance measures which are capable of testing processes from start to finish guarantee safe, reproducible and approved results. With the Spectroquant®
NOVA and Pharo photometers, Merck is the
only provider to make instrument-supported analytical quality assurance possible. All AQA measures are documented in the test report, in accordance with GLP. Validation, verification and calibration guarantee reliable analyses in accordance with international standards. GLP requires a careful process: installation qualification (IQ) and operation qualification (OQ) guarantees that instruments work as they should after installation. The performance qualification (PQ) then checks product-related functionality by testing method- specific standards and samples at intervals during routine work or before each individual test. Merck offers comprehensive IQ, OQ and PQ documentation for the Spectroquant® as IQ and OQ documents for Turbiquant®
and Reflectoquant® instruments. Reader Reply Card No. 137 Reader Reply Card No. 138 systems, as well
IET May / June 2011
www.envirotech-online.com
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