Is it possible to have a vacuum pressure measurement device with a -20 to +50 psi gauge pressure range, since I’ve never seen a pressure instrument with a range greater than -15 psi?
Featured Help Guides
A selection of detailed guides to help with selecting, specifying and using measurement instrumentation.
Measuring negative pressure using a positive differential pressure range
How can you use a differential pressure measurement device to measure a negative pressure if it has been factory configured to measure a positive pressure range without making any adjustments to the electronics or the signal output?
Calculating required pressure range for fuel tank level measurement
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.
What does negative and positive gauge pressure mean
You may not be aware but nearly every pressure measurement device you are using has a positive or negative gauge reference.
Can you measure vacuum using a gauge pressure range
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.
What is the difference between vacuum and absolute pressure
Often you will see a measurement of vacuum pressure described as an absolute pressure reading, so is there any difference between the two?
Pressure Measurement
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.
Liquid Level Sensors
Device for measuring liquid level and converting it to an electrical signal to send to other instrumentation.
How do you measure the volume of a liquid using pressure
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 Readouts
Digital readout instruments for displaying measurement readings of sensor inputs and providing controller output signals.
Dual Temperature and Pressure
Sensors & instruments which have both temperature and pressure measurement within the same device.
High Temperature Protection
High temperature protected sensors and instruments for taking measurements of very hot liquid or gases.
Digital Pressure Gauges
This guide will help you choose digital pressure gauges by pointing you to the most appropriate product for a particular feature or function
Data Loggers
A guide to data loggers including explanations, applications and product selection guide for recording measurement data.
Pressure Transmitters
Find pressure transmitters for your application. Select an article to help with selecting or using pressure transmitters
Voltage Output Pressure Transducers
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.
Millivolt Output Pressure Transducers
This guide will help you select a millivolt output pressure transducer and explain the advantages of using this type of pressure sensor.
Digital Pressure Sensors
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.
kg/mm² – Kilogram per Square Millimetre Pressure Unit
Find conversions for the kg/mm² (kilograms per square millimetre) pressure unit.
Hydrostatic Liquid Level Sensors
Collection of resources for selecting and using a hydrostatic liquid level sensor.
Differential Pressure Sensors
Differential pressure sensor product selection guide for sensors used to measure the difference in pressure between two points.
Why use 4-20mA and 3-15 psi rather than 0-20mA & 0-15psi
Why we mainly use 4-20 mA current and 3-15 psig pressure and not use from zero to 20 mA or 15 psig?
What is the difference between zero offset and zero drift?
Zero Offset relates to the zero setting tolerance during manufacture and Zero Drift relates to the expected maximum change in zero over time.
Choosing PVC, PUR, FEP and TPE cable types
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.
Marine Approval
A guide to marine approval including explanations, applications and a choice of products certified for marine use.
Compound Pressure Ranges
Compound pressure ranges include both a positive and negative pressure range in one pressure measurement device.
Absolute Pressure
A guide to absolute pressure measurement including explanations, applications and choice of products for measurements using a absolute reference.
Differential Pressure
A guide to differential pressure measurement including explanations, applications and choice of products for measuring differential pressure
Hydrostatic Pressure
Hydrostatic pressure is the pressure that is generated by the weight of liquid above a measurement point, when the liquid is at rest.
Suction Pressure
Suction pressure is a negative difference in pressure generated between two points which draws a gas or a liquid from a higher to a lower pressure state.
Pressure Transducers
A pressure transducer is a device which converts an applied pressure into a measurable electrical signal.
Flush Diaphragm
A guide to flush diaphragm pressure & level measurement instrumentation, including explanations, applications and a choice of products with flush process fittings.
Vacuum
This guide provides an overview of measuring vacuum pressure including suggested vacuum measurement products and question & answers.
Determining calibration error of Bourdon tube pressure gauge
How do you calculate maximum gauge error in pressure measurement with a bourdon gauge instrument?
What can cause random variation in pressure transducer output
I have a 10bar pressure transducer with a 4-20mA output which is showing a random variation across a span of 0.3mA (+/- 1.5mA) at a fixed pressure.
Difference between vented and non-vented water level measurement
A hydrostatic level probe typically uses pressure sensor to measure the water level. The main component of a pressure sensor is the sensing diaphragm which converts the difference in pressure between either side of the diaphragm into a measured signal. The front of the diaphragm measures the water level pressure (hydrostatic pressure) plus the barometric […]
Determining water tank volume using hydrostatic pressure
Can a pressure measurement device be used to measure the volume in a rainwater harvesting tank?
What is difference between working, burst and over pressure
I have a confusion regarding the difference between the maximum working pressure, overpressure and burst pressure for pressure transmitters.
Process Connections
Find answers to questions about process connections used to install measurement instrumentation.
Advantages and Disadvantages of using a 4 to 20 mA Signal
A 4-20mA current signal has become very popular for many applications beyond it’s original intended purpose in the process industry. It is now used throughout industry as the preferred measurement and control signal for many different types of systems. Despite the popularity of the 4-20mA signal, it is not the best solution for every application […]
Not Reading Zero when Pressure is Vented to Atmosphere
It is not unusual for a pressure measurement device to read slightly above or below zero with no pressure applied.
How to Connect a 4-20mA Current Loop Pressure Transmitter
All devices connected to make up a 4 to 20 milliamp current loop are connected in series.
Symptons and Causes of Damage to Pressure Transducer Diaphragms
It is possible to view part of the diaphragm on most pressure transducers and some which are completely exposed such as flush diaphragms are particular vulnerable to mechanical damage.
Measurement Accuracy
There are many contributing error factors which go into a total uncertainty calculation. The way accuracy is defined for pressure instruments on technical data sheets can vary significantly across manufacturers and product types.
Barometric Pressure
A guide to barometric pressure measurement including explanations, applications and choice of products for measuring barometric pressure.
Pressure Calibration
This guide will answer many of your questions about using & selecting pressure calibration equipment.
Transforming a 2 wire Current Loop into a Voltage Output Signal
If you are running a signal cable over a long distance or have a spare current output pressure transmitter, it is possible to convert the output signal to a voltage type to make it compatible with voltage only input devices. A typical current output is 2 wire 4 to 20 mA which is designed to […]
Measuring the difference in air pressure between rooms
Monitoring and controlling the pressure in a room is a critical parameter in many indoor environments where the climate must be maintained at a particular temperature, humidity and cleanliness/containment level.
What is the difference between gauge and absolute pressure measurement
Determining whether you need gauge or absolute reference pressure is a very important to selecting the right pressure range for a pressure instrumentation.
Supply voltage and load resistance considerations for pressure transmitters
In order for any pressure transmitter to function within designed performance levels, a min. supply voltage must be maintain device operation.
Pressure Sensor Accuracy Specifications
Understand what parameters are included in pressure sensor accuracy specifications and what techniques were used, so that a true comparison can be made.
Measuring vacuum with negative gauge or absolute ranges
There are two reference points for measuring a vacuum pressure.