Everything You Need To Know About Sanitary Flow Meters

Technology | hhf

May 11, 2021

You probably never heard of the sanitary flow meter. As a matter of fact, sanitary flow meters are used to calculate the flow of fluid or gas through a system in a linear, nonlinear, mass, or length. Any considerations must be included when selecting traffic times. This involves the medium form, the medium pressure range and temperature range, the necessary measurement precision, the necessary measurement rate, etc. Next, we are going to share everything you need to know about sanitary flow meters before you buy them.

Everything you need to know about flowmeters
To select the best flowmeter, the conditions of a particular application must first be understood. The form of process medium and the whole method should also be carefully and fully assessed.


Properties of sanitary flow meters
Is it necessary to provide the name and pressure of the medium, temperature, permissible pressure decrease, density (or special gravity), conductivity, viscosity (Newtonian viscosity)? And the steam pressure at the optimum working temperature. In addition, the degree to which these attributes may be modified or interacted is given. Further information on protection and toxicity should be given, along with specific details on fluid structure and bubbles, solids (abrasive or soft material, particular scale, fiber), change trend, and optical conductivity (cloudy, translucent or transparent?) consistency.


Sanitary flow meters pressure and temperature scale
In addition to the usual operating value, when choosing flow time the estimated maximum and minimum pressure and temperature values should also be defined. Furthermore, it should be clarified if backflow, whether the pipeline is still complete, if there is a chance of flow-impacting (gas-solid-liquids), whether air or pulse fluctuation may be absorbed and if abrupt temperature changes are likely. During cleaning and repair, special measures are needed.


Place of installation of sanitary flow meters
The following points should also be considered with respect to the position of pipes and flow meters: orientation (no downward flow in systems utilizing fluids), distance, content, inner diameter, flange pressure values, transition, pipe bending inlet and exit, current valve lengths, regulators and straight pipe parts. The developer who gives this information should know if vibrations or magnetic fields exist in the region, whether the area could be present, if the area is identified as a possible explosion, and if there are any specific requirements such as sanitary specifications or cleaning requirements for installation (CIP).


The next stage is to decide the proper measuring range by deciding the minimum and maximum flow to be determined (mass or volume flow). Then assess the appropriate precision of the calculation. The precision is generally provided as a percentage of the efficient calculation, calibration range or final value. Accuracy standards are defined separately for minimal, standard and maximum flow rates. As long as you know these conditions, the flowmeter will not be sufficient across the entire measuring range.


In the event where goods are sold or purchased based on measurement performance, precision is very critical. Repeatability can be more critical than consistency in some cases of usage. It is also proposed that precise and repeatable conditions be decided and included in the specification for each submission.


The absolute error rate would grow as the calculated flow decrease if the flow meter is defined as a percentage of the calibration range or the final value. Where the measuring error is specified as a percentage of the real measuring amount, the absolute value for both high and low flow rates is unchanged. Since the end value is often higher than the calibration scale, the final power sensor often has a bigger measuring error than the same specification sensor (with the sensor of percent calibration range). Therefore, it is advised that all recorded error messages be translated to the same measuring rate unit to compare all quotes equally.


The carefully prepared flow meter specifications would translate all accuracy details equally into the percentage of real measuring rate units and specify minimal, standard and maximum flow criteria. Both flow meter specifications and quotes shall provide consistent details on flowmeters' precision and repeatability at minimum, average and maximum flow speeds.


Precision and repetitiveness Meters of sanitary flow
This is preferable if two separate types of flow meters are used to obtain adequate measuring efficiency, and one category has no moving pieces. Moving components may create issues because of obvious causes (e.g. wear, lubrication and easy-to-form film), but also because moving components generally need clearance and the resultant 'slip' leads to a decrease in precision. Even with well maintained and balanced devices, this unmeasurable flow will alter whether the viscosity or the temperature of the medium increases. The shift in temperature often causes the internal diameter to change, such that it must be compensated.


Moreover, if you can achieve the same efficiency with a full flowmeter and points sensor, the usage of a flowmeter is usually preferred. Since point sensors do not display the whole flow, they can only calculate precisely if the flow rate is at a depth which corresponds to the average speed curve of the whole pipe. Even if this is carefully measured during calibration, the velocity curve is unlikely to stay stable as it differs with flux rate, viscosity, temperature and other variables.


Sanitary flow meter units of mass or volume
It is easier to decide if the flow data can appear in mass or volume before choosing the flowmeter. By calculating the flow rate of compressible products, the volume flow rate is not quite significant unless the density (sometimes the viscosity) is stable. When testing incompressible liquid velocity (volume flow), the scattered bubbles create errors and the air and gasses must be separated before the liquid enters the device. The lining of the pipe can trigger issues (ultrasonic) with other flow sensors, or the measurement device may not be at all usable.


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