61 Mini Flow Meters for Smallest Flow Rates
Bronkhorst Cori-Tech BV. has released a new model in its series of compact Coriolis Mass Flow Meters/Controllers for accurate measurement and control of (very) low flow rates. With the mini CORI-FLOW®
model M12 the lowest capacity has been reduced to 0,4…20 g/h. The instruments are suitable for both measurement and control for liquid
flow as well as gas flow applications. The unique design of the miniature Coriolis sensor features superior response time and high accuracy, irrespective of changing operating conditions with regard to pressure, temperature, density, conductivity and viscosity. The effective turndown is no less than 1000:1, with easy, on-site possibility for the user to re-range the instrument to his requirements, thus guaranteeing highest process flexibility.
Mini CORI-FLOW® , being the smallest Corilios flow meters on the market, have a robust IP65 weatherproof housing and are available with approval for use in hazardous areas
features state-of-the-art digital technology, offering standard analogue and RS-232 communication, optional fieldbus interfaces and additional functions such as alarms, totaliser (to measure fluid consumption) and batch dosing. Both fluid temperature and density are available as secondary digital outputs.
Typical applications include research laboratories, food and pharmaceutical industries, analytical installations, micro-reactors and anywhere requiring accurate, fluid independent mass flow measurement or dosage of very small flow rates.
Circle no. 177
(ATEX Cat.3 Zone 2). The instruments offer integrated PID control and close-coupled control valves or pumps, thus constituting very compact Coriolis mass flow control loops. Mini CORI-FLOW®
New Valves Designed for Effective Control of Fluid Handling Systems
Bio-Chem Fluidics’ newly redesigned solenoid operated pinch valves provide more effective control of flow paths for fluid handling systems. The 075P2 2-way valves have low power requirements and are available with a normally open or normally closed valve function.
The new design eliminates sharp edges, with smooth contours that allow easier insertion and removal of tubing without snares. An integrated insert provides both positive tube retention and confirmation of correct tubing size. Manual push-button override is available as an option. The valve’s new design also includes a valve body constructed from Luran and a plunger composed of Ryton. These materials are resistant to most common cleaning solutions and easily meet Bio-Chem Fluidics’ 2 million cycle operation standard.
Circle no. 178
Straight Forward Water Determination in Various Plastics
The presence of excessive water in plastics adversely affects the performance of polymeric goods. This is why water determination is of crucial importance. Metrohm describes the straightforward and accurate determination of the water content using the Karl Fischer Oven Method in ten different plastic types.
The plastic sample being tested is heated in a hermetically sealed vial. The moisture liberated from the sample is transferred via a dry carrier gas stream into the titration cell where it is coulometrically titrated. For every plastic type, the optimum oven temperature can be determined in a water release curve. This procedure ensures fast and quantitative water extraction in a reasonable time while – very important – excluding interfering decomposition reactions.
Thermally stable polycarbonates, fibre-reinforced polyesters and acrylonitrile-butadiene- styrene (ABS) resins need to be heated to 230ºC to extract water. Thermally less stable resins such as polyamides and PVC need only to be heated to 150 and 100ºC, respectively. The water content in the following plastics was determined: Terluran®
GP-22 Natural; Grilamid® Natural; Ultramid® HTV-3H1 Natural; Makrolon® TR 55 Natural;Ultramid® A3K
A3K Black; Ultramid A 3H-G5 Black; Grivory 1243 (colour code 550111); PET
regrind (recycled); PET regrind (new); PVC. Circle no. 179
Uninterrupted Flow Chemistry
The Uniqsis FlowSyn™ flow chemistry system now has an upgraded pump manifold that continuously monitors each high-pressure reagent channel and alerts the user to any flow abnormalities, saving time and precious reagents by preventing experiments continuing under erroneous conditions. Reagent immiscibility, incomplete wetting of pump components or the presence of static or transient air bubbles are the usual causes of the flow irregularities that sometimes occasionally occur during a run, and in most cases can be
corrected by re-priming the pump. Unfortunately with most systems this usually means aborting the experiment, but with the reagent manifold used in FlowSyn the pump can be re-primed ‘on the fly’, so that the run can continue.
Interlocks are provided so that if the error is not remedied within a specified period, the experiment is aborted. If an error condition is detected in one pump channel, the other is automatically stopped simultaneously until the problem is dealt with. New and improved automatic injection valves are now available for FlowSyn, with specially designed, highly inert rotor seals and larger diameter channels that allow sample loops to be filled more quickly and are less easily blocked. These new valves can be retro fitted to any FlowSyn unit with electrically operated injection valves. As an added convenience, vertical syringe ports mean that syringes can be left in place during a run to make re-priming easier.
Circle no. 180 Circle no. 181
INTERNATIONAL LABMATE - FEBRUARY/MARCH 2010 - LABORATORY PRODUCTS
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