MR-WL 203 Fundamentals of pressure measurement Teaching Equipment Hydraulic Bench
Description
• comparison of different pressuremeasurement methods • measuring positive and negativepressure • calibration device with Bourdontube pressure gauge for calibrating mechanical manometers Measuring pressure is important in theengineering industry, e.g. in plant, turbomachine and aircraft constructionand in process engineering. Other fundamental factors such as flow rate or flowvelocity can also be determined basedon a pressure measurement. The MR-WL 203 experimental unit enablesthe user to measure the pressure withtwo different measuring methods: directly by measuring the length of a liquidcolumn (U-tube manometer, inclinedtube manometer) and indirectly bymeasuring the change of shape of aBourdon tube (Bourdon tube pressuregauge).
In a U-tube manometer, the pressurecauses the liquid column to move. Thepressure difference is read directly froma scale and is the measure for the applied pressure. In inclined tube manometers, one leg points diagonally up. Asmall height difference thereforechanges the length of the liquid columnsignificantly. The principle of the Bourdon tube pressure gauge is based on the change incross-section of the bent Bourdon tubeunder pressure. This change in crosssection leads to an expansion of theBourdon tube diameter. A Bourdon tubepressure gauge is therefore an indirectly acting pressure gauge where thepressure differential is indicated via atransmission gearing and a pointer. In experiments, pressures in the millibarrange are generated with a plastic syringe and displayed on the manometers. The experimental unit is equipped withtwo Bourdon tube pressure gauges formeasuring positive and negative pressure. The U-tube manometer, inclinedtube manometer and Bourdon tube pressure gauges at the experimentalunit can be combined using tubes. A calibration device enables calibration of anadditional Bourdon tube pressure gaugeusing a weight-loaded piston manometer.
Learning objectives/experiments • familiarisation with 2 different measuring methods: · direct method with U-tube manometer and inclined tube manometer · indirect method with Bourdon tubepressure gauge • principle of a Bourdon tube pressuregauge • calibrating mechanical manometers Specification [1] basic experiments for measuring pressure withthree different measuring instruments [2] U-tube and inclined tube manometer [3] one Bourdon tube pressure gauge each for positiveand negative pressure [4] plastic syringe generates test pressures in the millibar range [5] calibration device with Bourdon tube pressuregauge for calibrating mechanical manometers
Technical data Inclined tube manometer • angle: 30° Measuring ranges • pressure: · 0…±60mbar (Bourdon tube pressure gauge) · 0…500mmWC (U-tube manometer) · 0…500mmWC (inclined tube manometer) LxWxH: 750x610x810mm LxWxH: 410x410x410mm (calibration device) Total weight: approx. 40kg Scope of delivery 1 experimental unit 1 calibration device 1 set of weights 1 oil, 500mL 1 ink, 30mL 1 funnel 1 syringe 1 set of hoses 1 set of instructional material