{"id":5796,"date":"2025-01-14T09:47:33","date_gmt":"2025-01-14T08:47:33","guid":{"rendered":"https:\/\/acurasens.com\/faq\/"},"modified":"2025-08-05T12:07:28","modified_gmt":"2025-08-05T10:07:28","slug":"faq","status":"publish","type":"page","link":"https:\/\/acurasens.at\/en\/faq\/","title":{"rendered":"FAQ"},"content":{"rendered":"\t\t
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Answers to the most frequently asked questions<\/span><\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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We place great value on personalized advice <\/strong>for each customer and on a trust-based collaboration. If your question is not answered here, please contact us personally. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\tFlow theories<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/a>\n\t\t\n\t\t\t\t
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\n\t\t\t\t\tBasics<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/a>\n\t\t\n\t\t\t\t
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\n\t\t\t\t\tInstallation<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/a>\n\t\t\n\t\t\t\t
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\n\t\t\t\t\tCalibration<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/a>\n\t\t\n\t\t\t\t
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Flow Theories<\/span> <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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1. What is the difference between the units ln\/min and ls\/min?<\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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When you hear the term mass flow rate, you usually think of units such as kg\/h or g\/min and the like. However, if you look at practice, you realize that working with volume units is predominant. Now, all that had to be done was to agree on standard conditions for converting mass into volume. <\/p>\n

Standard conditions (ln\/min)<\/sub>: The standard conditions were defined as 0 \u00b0C and a pressure of 1013.25 mbar absolute. The relevant volume units are identified by the subscript letter n: ln\/min.<\/sub> <\/p>\n

Standard conditions (ls\/min)<\/sub>: Another specification for converting mass to volume is the standard conditions, which are based on 20 \u00b0C instead of 0 \u00b0C and are marked accordingly with an s instead of the n: ls\/min.<\/sub><\/p>\n

Note: Internationally, the terms sccm (standard cubic centimeters per minute) and slm (standard liter per minute) are often used; the same definition applies here as for mln\/min <\/sub>(0 \u00b0C, 1013.25 mbar abs).<\/p>\n

Note: If the difference between ln\/min <\/sub>and ls\/min<\/sub> is not taken into account, this results in an error of approx. 7%.<\/p>\n

You are welcome to give us your reference points, your instrument will then be configured accordingly.<\/p>\n<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>

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2. What do SCCM, SLM, SCFH and SCFM stand for?<\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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These abbreviations of the units of mass flow beginning with an \u201cS\u201d refer to the usual reference conditions:<\/strong> 1013.25 hPa(abs) and 0 \u00b0C.<\/p>\n

Note: <\/strong>Reference temperature and pressure conditions of the flow unit of the instruments are always listed on the calibration certificate.<\/p>\n<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>

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3. What is meant by measuring span or control range (turndown)?<\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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The turndown ratio<\/strong> of an instrument indicates the range in which a flow meter or controller can accurately measure a liquid. In other words, it corresponds to the upper limit of a measuring range compared to the lower limit. This is expressed as a ratio and calculated using a simple formula: <\/p>\n

Measuring range = maximum \/ minimum flow rate<\/strong><\/p>\n

For example, if a particular flow meter has a measuring span of 50:1, it can measure the maximum flow to within 1\/50. Assuming a flow meter has a full-scale value of 20 ln\/min, the flow meter will measure the flow to the end of the range of up to 0.4 ln\/min. Bear in mind that the maximum or minimum possible flow rate of a measuring device or controller can have a larger measuring range than the adjustable measurable and controllable range. For example, it would be possible for a mass flow controller to have a measuring range from a minimum of 0.16 ln\/min to a maximum of 25 ln\/min, but the actual measuring range is determined by the reduction ratio. <\/strong>In relation to this example, this means If the calibrated high flow rate is 25 ln\/min, the lowest measurable value corresponds to 0.5 ln\/min (1\/50 of 25). If the application requires the calibrated minimum flow to be 0.1 ln\/min, then the measurable maximum flow is 5 ln\/min (50 times 0.1). <\/p>\n<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>

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4. How to calculate conversion factors, Kv values and differential pressures?<\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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Bronkhorst has developed a database in which more than 1800 fluid <\/strong>data are stored. Using the application software, various calculations can be performed online on our website www.fluidat.com.<\/a><\/strong> We invite our customers to use this website after a free registration. After receiving your login details, you can calculate conversion factors and tables for Bronkhorst thermal gas and liquid meters, Kv values and orifice sizes of Bronkhorst control valves, pressure drop of Coriolis flow meters and inlet filters and perform calculations that are important for your CEM evaporation system. <\/p>\n<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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FAQ<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Electrics<\/span> <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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1. Which supply voltage and analog signals are available?<\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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There is a wide variety of possibilities <\/strong>for electrical connection and communication. All Bronkhorst mass flow\/pressure meters and controllers can generally be supplied with 15 or 24 Vdc. For analog inputs and outputs, 0-5 Vdc, 0-10 Vdc, 0-20 mA and 4-20 mA are optionally available. We can also offer other options on request. <\/p>\n

The digital communication <\/strong>of most product lines includes RS232, PROFIBUS DP, DeviceNet\u2122, Modbus-RTU\/ASCII, EtherCAT\u00ae<\/sup>, PROFINET, CANopen, Modbus TCP, EtherNet\/IP, Powerlink and FLOW-BUS (Bronkhorst\u00ae<\/sup> fieldbus).<\/p>\n<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>

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2. What is the additional power consumption for fieldbus interfaces?<\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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We offer a variety of options<\/strong> for fieldbus interfaces that are integrated into the flow\/pressure meter and controller. Typically, the additional current consumption for the interfaces is < 75 mA for instruments used at 15 V supply voltage and < 50 mA for instruments used at 24 V supply voltage. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Additional power consumption of onboard fieldbus interfaces<\/strong><\/p>\n

In the table you can see the exact values for each fieldbus type.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Fieldbus<\/div><\/div><\/div><\/th>
with 15 V supply<\/div><\/div><\/div><\/th>
with 24 V supply<\/div><\/div><\/div><\/th><\/tr><\/thead>\n\t\t\t\t\t\t\t\t
PROFIBUS DP<\/div><\/div><\/div><\/td>
53 mA<\/div><\/div><\/div><\/td>
30 mA<\/div><\/div><\/div><\/td><\/tr>
PROFINET<\/div><\/div><\/div><\/td>
76 mA<\/div><\/div><\/div><\/td>
48 mA<\/div><\/div><\/div><\/td><\/tr>
EtherCAT\u00ae<\/div><\/div><\/div><\/td>
66 mA<\/div><\/div><\/div><\/td>
41 mA<\/div><\/div><\/div><\/td><\/tr>
CANopen\u00ae<\/div><\/div><\/div><\/td>
n.a.<\/div><\/div><\/div><\/td>
48 mA<\/div><\/div><\/div><\/td><\/tr>
DeviceNet \u2122<\/div><\/div><\/div><\/td>
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48 mA<\/div><\/div><\/div><\/td><\/tr>
EtherNet\/IP <\/div><\/div><\/div><\/td>
51 mA<\/div><\/div><\/div><\/td>
35 mA<\/div><\/div><\/div><\/td><\/tr>
Modbus-TCP<\/div><\/div><\/div><\/td>
51 mA<\/div><\/div><\/div><\/td>
35 mA<\/div><\/div><\/div><\/td><\/tr>
POWERLINK<\/div><\/div><\/div><\/td>
51 mA<\/div><\/div><\/div><\/td>
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Questions about measurement technology in general<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Basics<\/span> <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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1. What is the difference between a standard liter and a standard liter?<\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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Unlike mass-related units such as the gram, a measure of volume is always dependent on its ambient conditions. <\/strong>The volume changes when the temperature and\/or pressure changes. If the temperature is increased, the space occupied by the medium increases. If the pressure increases, it becomes smaller. Consequently, when specifying a volume, the reference temperature and the reference pressure must always be specified. <\/p>\n

If I enclose a liter of air at 0 \u00b0C and an ambient pressure<\/strong> of 1013.25 mBar, this is referred to as a standard liter in measurement technology. If the temperature is increased to 20 \u00b0C, the gas expands by 7.3 %. This is called a standard liter. Each industry sets its own standard. <\/p>\n

Contact<\/a><\/p>\n<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>

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2. What is meant by volume measurement and mass measurement?<\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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If you measure the volumetric flow rate, this refers to the volume of a medium<\/strong> that moves per unit of time. The corresponding units are m3\/h, m3\/min, CFM or ACFM. If the medium is a gas, its volume expands depending on the temperature and pressure conditions. This must be taken into account when measuring the volume. However, the weight of a gas, i.e. its mass, does not change. The mass flow rate is the measure of the movement of a mass per unit of time. The units for mass flow are kg\/h and lb\/min. <\/p>\n<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>

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3. What is meant by absolute pressure and relative pressure? <\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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The clearest reference pressure <\/strong>for pressure measurement is absolute zero (vacuum = 0 bar), which prevails in the vacuum of the universe. A pressure that is related to this reference pressure is called absolute pressure. With relative pressure, the reference pressure is not the zero point, but the actual ambient pressure (atmospheric pressure = 1 bar). A relative deviation of the air pressure from the ambient air pressure is called gauge pressure. <\/p>\n<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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1. How does FLOW-BUS fieldbus communication work with Bronkhorst's FlowSuite software?<\/div>\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t
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What is FLOW-BUS?<\/strong><\/p>\n

FLOW-BUS is a fieldbus developed by Bronkhorst based on RS485 technology for digital communication between multiple digital devices. This communication protocol offers the possibility of host control by a PC. <\/p>\n

What is FlowSuite?<\/strong><\/p>\n

FlowSuite is a Windows PC application for monitoring and servicing Bronkhorst digital instruments via a single interface in a multi-device window. It provides a good insight into the dynamic behavior of the flow meters and controllers. <\/p>\n

How to connect FLOW-BUS and FlowSuite in practice?<\/strong><\/p>\n

Bronkhorst instruments are equipped with a micro-controller to exchange parameter value information with other devices connected to the same FLOW-BUS system or via RS232 to a PC.<\/p>\n

Here are some examples of how to correctly install Bronkhorst instruments using FLOW-BUS with FlowSuite:<\/p>\n