Using a pressure measurement instrument to measure fuel level is very common, however most are scaled in bar or psi pressure ranges, and if they do happen to be scaled in level units, they are typically water level based, such as mH2O or ftH2O.
Measurement & Instrumentation Guides
Guidance and reference articles for sourcing, setting up and using measurement equipment.
You may not be aware but nearly every pressure measurement device you are using has a positive or negative gauge reference.
The most common type of pressure range for pressure measurement instrumentation is one which has a gauge reference. So if you want to measure vacuum pressure, it would be convenient to use a gauge pressure device which is the most widely available pressure range format.
Often you will see a measurement of vacuum pressure described as an absolute pressure reading, so is there any difference between the two?
One of the most common measurements on any machine or process is pressure. Air, gas and liquids are used extensively on many types of machines as the medium used to operate moving parts.
Work out what pressure gauge is needed based on the bore size of the cylinder and the maximum force generated by a press.
Float activated switches for opening or closing electrical contacts at a preset fluid level.
Measurement and point detection devices for monitoring liquid level and activating switch contacts at predetermined liquid level thresholds.
Vibrating tuning fork switches for opening or closing electrical contacts at a preset fluid level.
Conductive sensing for detecting when a preset fluid level has been reached.
Capacitance method for measuring the level of a fluid.
Radar method of measuring distance from a solid or liquid.
Ultrasonic method of measuring distance from a solid or liquid.
Positive displacement (PD) volumetric flow rate measurement.
Vortex shedding von Karman effect flow measurement.
Using upstream and downstream ultrasonic transit time difference to measure flow velocity.
Ultrasound acoustic wave fluid flow velocity sensors.
How the Doppler effect acoustic frequency shift principle is used in flow measurement instrumentation.
Measuring the volume of a substance that has passed a particular point in a specified time period.
Measuring the mass of a substance that has passed a particular point in a specified time period.
A landfill site is an area of land that is used to bury waste material.
Device for measuring liquid level and converting it to an electrical signal to send to other instrumentation.
Resistive strain gauge device.
Thin film deposition surface layer.
Turbine rotor blade and motion sensor for measuring speed of a substance.
Paddle wheel impeller and magnetic pickup sensor.
Instrumentation for measuring the motion of a substance as it passes through a pipe or duct.
Total accumulated quantity of substance transferred.
Universal Serial Bus (USB) interface computer connection
Pressure sensing devices
This article explores the many advantages of wired sensors compared to wireless sensors in order to help you make a decision on whether to opt for a wireless sensor network over a wired sensor installation.
It is not possible to measure the volume directly, and unfortunately there is no such device as a volume sensor, however if you know the dimensions of the space filled with liquid, you can easily determine the volume.
Digital readout instruments for displaying measurement readings of sensor inputs and providing controller output signals.
Sensors & instruments which have both temperature and pressure measurement within the same device.
This submersible sensor & instrument selection guide will help you select products for installations where the instrumentation will be completely submerged.
Measurement instrumentation which can be connected via a USB, RS232 or RS485 digital interface communications.
Transducers for incorporating into OEM design instrumentation products to monitor or control.
Miniature size sensors with small size dimensions for measurements where a small diameter, short length or a low mass is required.
Pressure sensors, digital pressure gauges, manometers, calibrators and data loggers for measuring pneumatic air pressure.
Low range pressure sensors, gauges, loggers and calibrators for measuring low pressures on filtration sytems, ventilation fans, air conditioning & handling systems.
Pressure measurement sensors & instrumentation for leak monitoring. Find a pressure transmitter or transducer for leak testing.
High temperature protected sensors and instruments for taking measurements of very hot liquid or gases.
High range pressure sensors, digital test gauges, loggers & calibration pumps for measuring and testing hydraulic equipment
Sensors & instrumentation that have a high frequency response measurement signal output or input.
High accuracy pressure instruments with precise sensor technology & digital electronics for test, research & calibration applications.
This guide will help you choose digital pressure gauges by pointing you to the most appropriate product for a particular feature or function
A guide to data loggers including explanations, applications and product selection guide for recording measurement data.
Find pressure transmitters for your application. Select an article to help with selecting or using pressure transmitters
This guide provides information on the types of voltage output pressure transducers you can use, and how to choose the right output signal for your application.
The ksi pressure unit is derived from the psi pressure unit by multiplying it by 1,000, and the full name is kilopounds force per square inch.
Find conversions for the mPa (Millipascal) pressure unit.
This guide will help you select a millivolt output pressure transducer and explain the advantages of using this type of pressure sensor.
This guide will help you choose a digital output pressure sensor for your application and explain the benefits of using a digital interface to transmit pressure readings.
Find conversions for the N/mm² (newtons per square millimetre) pressure unit.
Find conversions for the N/cm² (newtons per square centimetre) pressure unit.
Find conversions for the kg/mm² (kilograms per square millimetre) pressure unit.
Collection of resources for selecting and using a hydrostatic liquid level sensor.
Differential pressure sensor product selection guide for sensors used to measure the difference in pressure between two points.
Before purchasing a pressure sensor, there are a number of application questions you will need to answer to ensure it is fit for purpose
How do I convert the pressure reading to quantity of milk at bottom temperature which varies approx 10 deg C
Why we mainly use 4-20 mA current and 3-15 psig pressure and not use from zero to 20 mA or 15 psig?
How do you use a dp cell measuring a span of 0-500 mmH2O with an o/p of 4-20 mA to control a flow rate of 0-1000 L/h for a flow meter range?
Zero Offset relates to the zero setting tolerance during manufacture and Zero Drift relates to the expected maximum change in zero over time.
When specifying the electrical connection for the DMP, DMK, LMP and LMK series of pressure/level transmitters you will need to choose from a selection of cable types.
A guide to marine approval including explanations, applications and a choice of products certified for marine use.
A guide to intrinsic safety measurement instrumentation including explanations, applications and choice of products for installing in hazardous areas.
ATEX is the European Directive for governing health and safety in explosive environments.
4 wire describes a sensor which has a either a wheatstone bridge strain gauge configuration or a amplified output sensor where the supply input is isolated from the signal output. 4 wire is also used to describe a resistive thermometer that is wired so that the error caused by the connecting wire on each side […]
Amplified Voltage Output is convenient and robust measurement signal over medium distances to use with analogue to digital converters.
Vented Gauge (VG) is a pressure referenced to atmospheric pressure via a vent path on the reverse side of the pressure sensing diaphragm.
There are many types of pressure units used depending on the country, industry and application.
Hysteresis is the difference of two separate measurements taken at the same point, before and after a physical quantity is increased and decreased.
Centimeters of Water Column is a manometric unit used to relate a pressure reading to the height of fresh water at a temperature of 4 degC. 1 centimeter of water gauge equals 98.0665 pascals.
Compound pressure ranges include both a positive and negative pressure range in one pressure measurement device.
Deadband is a region of pressure where a change in pressure produces no change in measurement output or control signal.
A guide to absolute pressure measurement including explanations, applications and choice of products for measurements using a absolute reference.
The bar is a widely used metric unit of measurement for pressure and 1 bar equals precisely 100,000 pascals.
Kilogram Force per Square Centimeter is a pressure unit that has been largely superseded by the SI unit system of pascal units.
The kilopascal is a x1000 multiple of the pascal unit which is the SI unit for pressure. 1 kilopascal equals 1,000 Pascals.
Centimeters of Mercury is a small pressure unit which represents the pressure pushing down due to gravity of any volume of liquid mercury which is 1cm high. 1 centimeter of mercury at zero degrees Celsius equals 1333.22 pascals. The use of cmHg is not as common as mmHg, it is mainly used in applications for […]
The g Effect is a change in performance of a pressure measuring device that is caused by a change in its orientation. Typically a pressure sensing device will have some form of flat diaphragm which will generate a change in output when flexed by a change in pressure. If a pressure sensing diaphragm is orientated […]
Grams Force per Square Centimetre is a cgs system pressure unit which is now largely obsolete and officially superceded by the SI system of units.
Gravity (g) which is defined by an acceleration of 9.80665m/s² is the designated average accelerating force due to Earth’s gravity at sea level.
A guide to differential pressure measurement including explanations, applications and choice of products for measuring differential pressure
Hectopascal is a 100x multiple of the pascal which is the SI unit for pressure.
HART® or Highway Addressable Remote Transducer is a type of digital communications protocol for configuring and reading instrumentation via 4-20mA signal.
Dyne per Square Centimeter is one of the smallest pressure units and is derived from the CGS unit for force, 1 Dyne per Square Centimetre equals 0.1 pascals.
Hydrostatic pressure is the pressure that is generated by the weight of liquid above a measurement point, when the liquid is at rest.
EPDM is a type of rubber seal material which offers excellent resilience against solvents, antifreeze and aviation hydraulic fluids.
Hygienic measurement instrumentation are designed for use by the food, drink and pharmaceutical industries, which require a high level of cleanliness in their manufacturing processes.
Foot of Water Column is an American and English low value pressure unit
Inches of water gauge or column is an english and american unit for measuring liquid level. 1 inch of water column at 4 degrees celsius equals 249.089 Pa.
Inch of Mercury is a British and American unit of measure for pressure. 1 inch of mercury at 0 degrees Celsius (32 deg F) equals 3386.39 pascals. An inch of mercury at zero degrees Celsius is defined as the pressure exerted by a column of mercury with a density of 13,595.1 kg/m3 under the pull […]
Negative Gauge Pressure is the difference in pressure between any vacuum and atmospheric pressure. The maximum possible negative gauge pressure is always limited by the current ambient atmospheric pressure, which constantly varies, but is typically around 1 bar absolute.
Newtons/Square Meter is a unit that shows how the pascal unit is derived from other SI units. Pressure is defined as Force/Area and the SI unit for Force is newtons (N) and the SI unit for Area is Sq Meters (m²). 1 newton per square metre equals 1 pascal. The N/m² pressure unit is one […]
Linearity, Hysteresis and Repeatability (LHR) is often used to describe the room temperature precision of a pressure sensor, excluding all zero & span offsets, temperature errors and long term stability. Also see non-linearity and pressure hysteresis.
The megapascal is a x1000000 multiple of the pascal unit which is the SI unit for pressure. 1 megapascal equals 1,000,000 pascals.
Ounce or Ounce Force per Square Inch is a low pressure unit which is part of the British and American system of units.
Meters of water gauge or column is a metric unit for measuring liquid level. 1 metre of water column at 4 degrees Celsius equals 9806.65 pascals.
Micron of Mercury is a very small pressure unit derived from the pressure that is generated by a 1 micrometer (1/1000mm) column of liquid mercury.