In this section you can find an alphabetical list of terms, abbreviations, and acronyms used across flow and pressure measurement and control equipment as manufactured by Bronkhorst.

Choose a letter below to navigate directly to your selection, or alternatively scroll down to browse the list.

Absolute pressurePABS is the pressure compared to a perfect vacuum.
Actual flowFlow rate expressed in amount of fluid per unit of time. This in contrast to percentual flow rate. Actual and percentual flow are user-selectable display options at Bronkhorst's readout/control devices (BRIGHT/E-7000/E-8000)
Ambient conditionsTemperature and pressure conditions around the measuring device.
"As found" calibrationCalibration is performed with the instrument before any adjustments are made.
"As left" calibrationThe instrument has been adjusted and the calibration is being performed with the adjustments.
AdjustmentWith adjustment of the measuring signal we mean that we change the settings of the meter according to the values of the used reference device. This to eliminate systematic measurement deviations.
Back pressure controlControl of the pressure at the inlet side (P1) of the pressure controller. A back pressure controller is situated at the downstream side of a process.
Baud rateData transmission speed of instruments connected to a fieldbus.
CalibrationCalibration is comparing the output of a measuring device with a reference.
EPCElectronic Pressure Controller. Pressure meter with integrated control valve.
EPTElectronic Pressure Transducer (also called Pressure Meter).
Forward pressure controlControl of the pressure at the outlet side (P2) of the pressure controller. A forward pressure controller is situated at the upstream side of a process.
Gauge pressureThe pressure difference between the system and the surrounding atmosphere.
IP40Ingress Protection class. Protection against solid particles larger than 1 mm, but no protection against moisture. Read more
IP65Ingress protection class "weatherproof". Dust tight, protected against water jets. Read more
Load impedanceThe impedance presented to the electrical connector of an instrument.
MassQuantity of substance expressed in (kilo)gram.
MFMMass Flow Meter. Flow meter measuring mass flow, in contrast to volumetric flow.
MTBFMean Time Between Failures. The predicted elapsed time between inherent failures of a device/system during operation.
NodeEach individual system component in a bus system.
Percentual flowFlow expressed in percentage of the full scale value. This in contrast to actual flow.
ProParShort for 'Process Parameter', the Bronkhorst specific parameter model for RS232 and FLOW-BUS communication.
RepeatabilityThe variability span for the measuring value when measurements are consecutively repeated under the same conditions.
Specific heat / Specific heat capacity / Heat capacity (Cp)The amount of heat needed to raise an amount of substance (mass) by a certain temperature, expressed in J/(kg·K). Cp refers to constant pressure.
Surface Mount / Top-mountMounting of an instrument on the surface of a base block (e.g. a manifold), due to which the tubing need not be dismounted in case of inspection or exchange of the device.
Top-mount / Surface MountMounting of an instrument on the surface of a base block (e.g. a manifold), due to which the tubing need not be dismounted in case of inspection or exchange of the device.
Ultrasonic principleThe basic principle of ultrasonic flow meters is the transmition of a sound(s) wave(s) through a pressured liquid into a pipe. The distinctive character of Bronkhorst's ES-FLOW flowmeter is that it’s capable to measure the actual speed of sound, meaning that the technology is liquid independent and calibration per fluid is not necessary, contrary to other (traditional) ultrasonic flow measuring principles based on the transit time or the Doppler effect. Read more.
VDMA VDM - Vapor Delivery Module - is an all-in-one evaporation device, incorporating gas and liquid flow controllers, a temperature controlled evaporator and a display with control functions to readout and adjust the gas flow, the liquid flow and the temperature of the mixture that exits the VDM as a homogeneous vapor. Read more.

Bronkhorst USA LLC

57 South Commerce Way
Suite 120
USA - Bethlehem, PA 18017 
Tel.  +1-610-866-6750

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