Never before has a generation of display units been more versatile. The RIA 45 and RIA 46 can be used as display units or limit indicators, active barriers, temperature transmitters or mathematics modules for calculating the differential, total and average or for linearisation.
All these functions can be combined in a way that satisfies the customer’s needs. The devices meet all the challenges of process industry applications and fulfil all the requirements for use in the field as well as the control room.
Process values are clearly shown in large numerals on the high-contrast, backlit, five-digit LC display. While measured and calculated values are displayed in black and white, additional information such as the tag number, bar graph and unit are displayed in yellow. Operating keys integrated in the front allow the user to switch to other values manually during operation. Needless to say, the display can also automatically alternate between different values.
The integrated electronics module offers a number of additional advantages for the display functionality, such as a universal power supply unit that guarantees the appropriate power supply at all times. Even the basic device has a universal input for connecting 0/4-20mA signals, voltage, resistance, resistance thermometers and thermocouples as well as an open collector to output faults or device status messages.
The device can optionally be fitted with an additional universal input including a second analog output and/or two limit value relays. It is possible for the first time to design the universal inputs as intrinsically safe in accordance with ATEX. The transmitters and sensors can also be powered in the hazardous area by the integrated transmitter power supply.
Predefined mathematical functions (+, -, average) ensure easy and fast configuration of calculations. Curves can be defined using two independent linearisation tables with 32 points. The relevant volume can thus be determined from the level. The display unit is flexible and can be universally used, with a control function, in all industries thanks to the high-contrast display, extreme ease-of-use and the fact that the functionality is limited to essential features.
From Humble Limit Switch to Inline-Density System
The Liquiphant M liquid limit detection switch from Endress and Hauser can now be used in combination with the newly developed FML621 density calculator for density measurements in food, beverage, pharmaceutical and chemical processes.
Liquiphant is a name that stands for 25 years of reliable and safe limit detection in liquids of all types. Now, in combination with the newly developed FML621 density calculator, the Liquiphant M can be used to monitor the quality of liquids in many manufacturing processes. The unit not only determines the relative and standard density, but also measures the concentration of liquids and thus identifies the product itself.
Careful control of these process parameters serves to ensure excellent and reproducible product quality directly online and in the process. The FML621 density calculator computes a reliable and accurate density value of the material from the Liquiphant sensor signals and from an optional temperature compensation unit.
The measured values can be converted to units such as °Brix, °Baumé or °Plato, as specified by the user. The liquid’s density is computed by the FML621density calculator through the input value of the Liquiphant frequency, the temperature and pressure. These last two values can be supplied and integrated using separate instruments. A data logger function in the FML621 also supports operation and servicing.
With the well-known and proven Liquiphant vibration sensor applications in pipelines or tanks, the unit can be used in all sectors of process industry. Density monitoring and pump protection take place simultaneously using a single Liquiphant and only one process connection is now necessary on the tank. Simply by using the FML621’s in-line quality measurement, extensive product analysis in the laboratory is now no longer necessary.
What Can The Liquiphant M Do In Combination With The Density Calculator?
Determining the concentration of materials is an important factor for quality in the chemical and the food industry. In liquids it is often found by peripheral off-line and laboratory measurements. The newly developed Liquiphant density system offers in-line concentration measurement without the use of expensive and time-intensive analytical procedures and can also easily be adapted to current applications.
A soft drink producer wants to differentiate between cleaning solutions, water and beverage in the pipeline. In order to ascertain that the raw product for filling is located in the pipeline, the density sensor is installed in the pipeline prior to filling. Until now the media was identified optically. The advantages of in-line measurement are seen in continuous monitoring, increased measurement accuracy and reproducibility.
Identifying Salt Concentration
In this crude oil application, a specific salt concentration is required that depends on the depth of the drill hole so the oil/water mixture is brought to the surface by the greater density of the salt mixture.
The Liquiphant density function ensures the required salt concentration is continuously mixed in the tank automatically. When compared with previous tests, this method has much greater precision (0.002g/cm³) with excellent reproducibility (0.0007g/cm³).