We have been using Krohne radar level gauges since 1993: in batch reactors, high-pressure LPG spheres, and in decomposition vessels. For us, it is fair to say that the radar level gauge has proved to be one of the most cost-effective solutions to liquid level measurement. It is certainly our first option for any new level control applications. If you only look at the purchase price, it is true that the initial cost is higher than for a simple pressure level transmitter. But with the pressure transmitter, you have to take account of the on-costs of the instrument stand, extra valving, manifolds, tubing and fittings. The radar level gauge of course is non-contact and, in our experience, generally zero maintenance as well: whilst the pressure transmitter needs continuing calibration and checking of the HP/LP legs for blocking and odd-legging.
Even on the simplest level transmitters, these additional maintenance procedures bring its overall cost up to that of a radar level gauge in about three years. If you add downtime to this equation, the breakeven point is less than one year. With more complicated level measurement problems - such as wet leg or purge systems, chemical seals and displacer systems - the radar system is much less expensive, both in terms of initial purchase price and in running costs. And it has better accuracy and reliability. Our early experience with radar level taught us two things. Firstly, it worked well as a straightforward level detector in situations where other methods had always failed: making polymer in a stirred batch reactor. Secondly, and somewhat unexpectedly, it became a multi-purpose quality control tool as well.
Initially a Krohne BM70 was specified simply as a high/low level detector to ensure the reactor was not over-filled, and that it was empty after draining out. However, by comparing recorder charts we noticed that the repeatability of the level measurement was extremely accurate - to within a few millimetres per batch. Such dependable performance opens up many new uses for the radar level gauge.
* It becomes a temperature control check, since heating cooling causes the reactor contents to rise and fall by predictable amounts.
* To calibrate the batch meters themselves: the three liquid charges could be checked, saving on extra batch meters and only calibrating them on failure.
* It checks on the addition of the catalyst: since subsequent polymerisation causes the reactor contents to fall by a known amount.
* It checks on the addition of other chemicals, which disturb the signal when they are poured in and interrupt the beam.
* Operators can make sure that the stirrer is working, since its action causes surface oscillations, which, in turn, result in a noisy band on the level signal.
All in all it is a bit like having a CCTV inside the reactor. It has gained wide acceptance with the operators, who find it a real comfort factor. Its cost is minute in comparison to the benefits: indeed one batch of material which we saved early on in the programme would have represented a bigger cost outlay than all the Krohne units installed on the site.
Cloud-based inventory management software Endress+Hauser South Africa
Level Measurement & Control
Netilion is an award-winning cloud-based IIoT ecosystem designed for industrial processes. It connects the physical and digital worlds to send valuable information from the field straight to your phone, tablet or other device.
Read more...Level sensing, conveyor control and grid resistors DRH Components
Editor's Choice Level Measurement & Control
DRH Components is a specialist electric component and systems supplier with a focus on the control of electric motors. As part of its wide variety of products, the company markets the entire Bindicator range. Bindicator manufactures sensors for dry bulk and liquid level measurement.
Read more...Level measurement under extreme plant processing conditions VEGA Controls SA
Level Measurement & Control
Level measurement in LNG and LPG processes is about answering the simple question: “How much product is in the tank?” However, obtaining an exact value is not easy. The products are often under pressure, cryogenic, and highly explosive. Sensors from Vega have been operating successfully in all stages of the LNG/LPG process for many years.
Read more...Grounding of hydrostatic level sensors WIKA Instruments
Level Measurement & Control
Hydrostatic level sensors are very often installed in outdoor applications, primarily in the water and wastewater industries. A good connection to ground is essential when installing hydrostatic level sensors, since no grounding or poor grounding can result in destruction or damage to the level sensor.
Read more...VEGA expands radar portfolio for factory automation VEGA Controls SA
Editor's Choice Level Measurement & Control
VEGA is known worldwide for ensuring safe and stable processes with its level and pressure sensors, even under the most difficult conditions. The world market leader is now putting the finishing touches to its radar level portfolio, especially to meet the demands of fast processes in factory automation.
Read more...Factory automation made easy VEGA Controls SA
Level Measurement & Control
With the introduction of VEGAPULS 42, instrumentation specialist, VEGA is bringing its extensive experience with radar measurement technology to factory automation.
Read more...The ultimate outdoor sensing solution Turck Banner Southern Africa
Level Measurement & Control
Turck Banner’s T30R series has been expanded with a new long-range model. This sensor can accurately recognise and measure targets up to 25 m away, which is a 10 m increase over previous models.
Read more...Non-nuclear density measurement Morton Controls
Level Measurement & Control
Red Meters are changing the way industry measures density of slurries and dry bulk with its range of non-nuclear meters. Measurement data is shown in real time. Combined with software called Ruby, the ...
Read more...Accurate measurement of moisture Morton Controls
Level Measurement & Control
Harrer & Kassen GmbH is an expert in the field of microwave and NIR measuring techniques. HK provides the development and manufacturing of progressive, reliable and advanced instruments for moisture ...
printer friendly version