DPG10A - Chamois Metrology
Contents
1. SAUser TB DPG10A Broch Tech GB doc2. into any of the common pressure units and the user has the possibility to configure the system to special units This rigorous metrology enables an ease of use as well as a speed of measurement operation They are interchangeable in a few seconds and the DPG10A s internal memory has the ability to save the metrological coefficients for 3 different piston cylinder assemblies OUREA In Gauge Absolute or Differential 555 or EE 0 A02B from 0 2 PaA to 200 kPa 0 2 bar kg Vi METROLOGICAL SPECIFICATIONS The manufacturing procedures the quality of the Researched metrological specifications materials we use the technological choices of DH BUDENBERG give the DPG10A standards metrological performances which are much better than those of the standard sensors and which can match up to these of Linearity 2E FS Hysteresis 2E FS Bias 7E FS Resolution 1E FS Repeatability SES Long term stability 2E FS Temperature effect full compensation Precision AES e Combination of repeatability hysteresis linearity and 3 year stability the best pressure balances Ra uncertainty researched for a 200 kPa range U 0 8 Pa 1 E 5 P Information given here in can be changed without any notice Page 6 of 9 SAUser TB DPG10A Broch Tech GB doc hy DH Budenberg Vil TECHNICAL SPECIFICATIONS January 2006 VIII 1 PISTON CYLINDER ASSEMBLIES VIII 2 STANDARD MASSES B Material tungsten carbide Internal mass B
3. micrometer as far as straightness roundness and parallelism are concerned which gives them a sensitivity a linearity and a repeatability no other manufacturer in the world can offer The assemblies which equip the DPG10A are absolutely identical to those used to develop the highest performance pressure standards Tungsten carbide has the advantage of not being very easily distorted under temperature and pressure Therefore the piston keeps its metrological qualities regardless the operating conditions DH BUDENBERG manufactures for the DPG10A 5 piston cylinder assemblies of different effective areas from 1 5 up to 5 cm each of them offering a different measuring range In order to increase the ease of use each of the 5 nominal areas has been designed in order that the piston cylinder assembly has a simple conversion coefficient of pressure into mass called Kn so that a Kn bar pressure is converted in 1 kg lll 2 THE MEASURING HEAD AN ESSENTIAL ROLE The measuring head is aimed at containing operating and protecting the piston cylinder assembly It is fitted with the new motorised rotating system which ensures the centring by rotation of the piston in its cylinder so that the force transmitted to the measuring force cell by the pressure is perfectly and fully vertical then without alteration It has been created to make sure that the rotating noises be less important than the sensitivity of both the piston and measuring c
4. 07 DH Budenberg January 2006 METROLOGY RANGE DPG10A Digital Primary Standard for Full Automatic Measurement amp Calibration of Gauge Absolute and Differential Pressures from 0 2 Pa up to 5 MPa 1 ppm usable resolution Information given here in can be changed without any notice Page 1 of 9 LE DH Budenberg l INTRODUCTION Established respectively more than 50 and 150 years ago DESGRANGES amp HUOT and BUDENBERG are specialised in the development and the manufacturing of pressure measuring and calibrating instruments and have gained a world wide reputation of excellence in this field Today the two companies have united under the name DH BUDENBERG and gathered their know how and resources to propose on the market the widest and most advanced range of pressure standards and calibration systems Through its subsidiaries DH BUDENBERG is directly established in France the United Kingdom Germany United states India and United Arabic Emirates Its laboratories are COFRAC DKD and UKAS accredited A wide international network of representatives and authorised services distributes their products all over the world Il ABSOLUTE DIGITAL PRIMARY STANDARD The DPG10A s measuring principle lies on the principle of the pressure balances and is based on the fundamental equation which defines pressure P F A with P as a pressure F a force and A an effective area In a pressure balance a vertical piston which turns free
5. DPG10A Broch Tech GB doc Page 5 of 9 hy DH Budenberg The constant parameters entering in the computing of pressure are stored in the non volatile memory of the DPG10A Kn of the piston cylinder assembly Sensitivity of the measuring force cell Nk Normal gravity gn Local gravity gi Pressure distortion coefficient of the piston cylinder assembly Apc e Thermal dilation coefficient of the piston cylinder assembly apc e Density of the calibration mass pm e Normal air density pan Some of these parameters are specific to each piston cylinder assembly and are determined during the calibration Cf XIII You can easily modify them if necessary and the internal memory allow to save the parameter of three different piston cylinder assemblies V MEASURING RANGES The DPG10A s pressure measuring ranges depend on the specific Kn coefficient of the piston cylinder assembly with which the measuring head is equipped Various measuring heads can be used with a same DPG10A in order to adapt the standard to several applications January 2006 The variable parameters affecting the calculation of the pressure are automatically measured and integrated in the expression of the pressure temperature of the piston cylinder assembly t ambient temperature humidity atmospheric pressure residual vacuum Pvide defining the air density during the calibration Pac The pressure is automatically converted
6. Poisson s ratio 0 218 B Material nickel chromium steel amp Young s modulus 6 10 N m B Mass density 7900 kg m 10 Typical geometry researched B Straightness typical manufacturing tolerance 0 1 um External optional calibration masses B Roundhess typical manufacturing tolerance 0 1 um amp Material 304L steel B Parallelism typical manufacturing tolerance 0 1 um R Mass density 7920 kg m 10 B Clearance between the piston and the cylinder 0 2 to B Composition of the set 5 x 2 kg 0 4 um according to the model B Adjusting tolerance to the nominal value 1 EM B Stability of the effective area lt 1 ppm an amp Calibration Uncertainty 2 4E M Vill 3 EMM ENVIRONMENTAL MEASURING MODULE Alarm setting Ambient temperature 4 wire PT100 Relative humidity Capacitive sensor Atmospheric pressure Strain gauge PCA temperature A DIN 43760 4 wire PT100 Vill OTHER TECHNICAL SPECIFICATIONS Dimensions L x W x H 530 x 400 x 320 mm Measurement fluid Dry and non corrosive clean gas Maximum overpressure 110 FS Operating temperature 10 to 30 C Sampling rate 250 ms Operating humidity 15 to 85 HR Computer interface RS232C Power supply 110 240 VAC 50 60 Hz Residual vacuum measurement Pirani gauge 1Pa fE Power consumption 20 VA Weight 20 kg IX SUMMARY OF THE FUNCTIONS The DPG10A has a great variety of functions aimed at facilitating its use and assuring the quality of its long ter
7. Switching off of the motor and the display and maintaining the measuring force cell on power Permanent display of the residual vacuum X REMOTE CONTROL All the DPG10A s functions even the ACF running command can be executed from an external computer through serial communication RS232C which enables it to be integrated in an automatic calibrating system xI MAINTENANCE The DPG10A is delivered with all the operating instructions consumables and tools allowing its general maintenance No other maintenance is necessary if the standard is used in accordance XII CALIBRATION All the DPG10A standards are delivered with a gauge calibration certificate issued as standard by the COFRAC accredited DHBUDENBERG s laboratory accreditations 2 1033 and 2 1129 which assures the user that the presented calibration results are unbiased The COFRAC calibration guarantees the traceability of the measurements done by the DPG10A to the National French Standards and through them to the international standards The calibration is operated in accordance with the RM aero 802 22 recommendation and takes into account the Kn specific coefficient determination the ACF calibration control XIII CE COMPATIBILITY The DPG10A has therefore a comprehensive programming language with macro commands A programming example is given in the user s manual with the routine instructions described in the manual Usual recalibrations need only ta
8. ances of primary pressure standards with the convenience of digital automatic transfer instruments e The measuring force cell permanently measures and interpolates the pressure generated force e This principle of absolute pressure measurement is a simple and fast solution it allows to measure in continue an absolute pressure without to have to break the vacuum between each pressure point as it is necessary with the classical pressure balances As a result the DPG10A s measuring principle is a primary principle it associates the measurement accuracy and reliability of fundamental pressure standards with the ease of use of automatic digital instruments Information given here in can be changed without any notice SAUser TB DPG10A Broch Tech GB doc Page 2 of 9 hy DH Budenberg Iil DPG10A S SUBSETS January 2006 DPG10A s measurement quality and long term performance are based on 5 main subsets lll 1 THE PISTON CYLINDER ASSEMBLY THE CORNER STONE The role of the piston cylinder assembly consists in turning perfectly the pressure into force The quality of this transformation mainly depends on an excellent geometry but also on a very low sensitivity to external influences The DH BUDENBERG s piston cylinder assemblies are manufactured in a special grade of tungsten carbide according to techniques which have been permanently refined for more than 50 years The manufacturing tolerances are typically below 0 1
9. ed out by the measuring force cell are valid are measured by the EMM and stored in the internal memory Therefore the EMM monitors the difference between the conditions stored during the calibration at t0 and the conditions measured when the operation took place at 1 The sensors with which the EMM is fitted are not used for their accuracy and long term stability but for their short term repeatability The pressure displayed by the DPG10A is calculated according to the following formula P Knx x41 x Apc X P x l apc x t 10 x Pac Pu p k En where p an p m Knis the specific coefficient of the piston cylinder assembly Nis the indication of the measuring force cell in count Nkis the sensitivity of the measuring force cell gris the local gravity in m s gnis the normal gravity in m s Apc is the pressure distortion coefficient of the piston cylinder assembly dec is the thermal dilation coefficient of the piston cylinder assembly tis the temperature of the piston cylinder assembly in C Pac is the air density during the adjustment of the measuring force cell in en kg m This parameter is null when the DPG10A operates in absolute mode pm is the density of the adjustment mass in kg m Pan is the normal air density in kg m Pvide is the residual vacuum in the reference chamber Information given here in can be changed without any notice SAUser TB
10. ell It is equipped with a 4 wire platinum resistance thermometer allowing the most accurate measurement of the piston cylinder assembly temperature The measuring head is coupled with the measuring force cell by 3 screws and can be dismantled in a few seconds It is possible to combine a measuring force cell with several measuring heads each of which being fitted with a piston cylinder assembly of different Kn to meet various application fields Measuring i block _ mA Coupling device Measuring force cell J gt and vacuum HI chamber Hyj Information given here in can be changed without any notice SAUser TB DPG10A Broch Tech GB doc Page 3 of 9 hy DH Budenberg January 2006 111 3 THE MEASURING CELL A FORCE TRANSFERRING FUNCTION The electronic measuring force cell has been developed for the high accurate manufacturing of mass comparators It uses the MONOBLOC technology manufactured by electroerosion this technology reflects latest innovations realised in mechanics electronic computer science and opto electronic The concept of Monobloc eliminates all the complicated mechanical links fit in a force sensor due to the substitution of the 90 assembly spares found in a traditional load cell by only one part lll 4 THE AUTOCALIBRATING FUNCTION The DPG10A s measuring force cell response to the force which is applied to it may drift with time In addition to this dri
11. essitate a bell to make the vacuum and masses to load January 2006 This instruments are used by our more faithful customer who are National Laboratories Meteorology the R amp D laboratories sensor manufacturers airway companies Associated to an automatic controler the DPG10A allows to performed fast calibrations without to have to break the vacuum between each pressure point and with a high metrological reliability XV DH BUDENBERG COMPANIES Web site www dh budenberg com DH BUDENBERG SA 56 rue des Ecole BP 125 93303 Aubervilliers Cedex FRANCE 33 1 4839 8300 33 1 4833 6590 dhonline desgranges com DH BUDENBERG LTD Northbank Industrial Estate M44 5AY Manchester UNITED KINGDOM 44 870 787 7370 44 870 787 7369 sales dh budenberg co uk DH BUDENBERG GMBH Raiffeisenstrasse 2 63110 RODGAU DEUTSCHLAND 49 6106 8294 0 49 6106 8294 17 kontakt dh budenberg de DH BUDENBERG Inc 300 CM Allen Parkway Suite 212 A amp B San Marcos TX 78667 USA 1 877 713 2733 41 512 353 3106 sales dh budenberginc com DH BUDENBERG PV LTD 299 300 2nd Main Road 600 096 CHENNAI INDIA 91 44 2448 2014 91 44 2448 2862 dhbudenberg vsnl net DH BUDENBERG FZCO 4A 114 Dubai Airport Free Zone PO Box 54639 Dubai United Arab Emirates 971 4 2045104 971 4 2045103 contact dh budenbergFZCO com Information given here in can be changed without any notice Page 9 of 9
12. ft which is due to the ageing of the measuring force cell a low short term drift may appear this is an evolution of the measuring force cell response according to the change of the environmental parameters above all ambient temperature and relative humidity To curb these drifts the DPG10A is fitted with an Auto Calibrating Function ACF coupled with an Environment Monitoring Module EMM Cf 111 5 The use of the ACF enables the measuring force cell to easily free from this drift by readjusting its deviation according to the new environmental conditions even when the measuring head is fitted The measuring force cell is associated with an Auto Calibrating Function Cf 111 4 which enables to apply to it easily and whenever it is necessary a reference force that is equivalent to the product of the mass multiplied by the local acceleration of the gravity F M x g in order to recalibrate it Consequently the measuring cell is not used as a force measuring instrument but as a comparator between the reference force created by the mass when the calibration takes place and the force which is exerted by the piston during the pressure measurements The measuring force cell is thus exclusively used for its short term repeatability The ACF consists in an automatic loading internal standard mass which can be easily loaded by pressing a key located on the front panel or from a remote computer By applying the standard mass you
13. ke place every 3 years The uncertainty calculation presented in the certificate respects the ISO TAG4 and EAL recommendations and shows the enlarged uncertainty of the DPG10A with a coefficient k 2 It takes into account the DPGI10A s _ intrinsic measurement errors the uncertainty of the reference means as well as the influence of the environment conditions the pressure control of the DPG10A s metrological performances and the calculation of its measurement uncertainty by comparison with a reference standard e DPG10A complies with the following European directives and norms Th n 89 336 CEE Electromagnetic Compatibility Directive dated May 3 1989 modified by the n 92 31 CEE directive dated May 12 1992 and the n 93 68 CEE directive dated July 22 1993 n 73 23 CEE Low Tension Directive dated February 19 n 1973 modified by the n 93 68 CEE directive dated July 22 n 1993 EN 50082 1 Ed 92 norm Emission with the 89 336 CEE directive EN 55022 B Class Ed 87 norm Immunity with the 89 336 CEE directive EN 61010 norm Safety rules for the use of measuring regulating and laboratory electric instruments with the 73 23 CEE directive Information given here in can be changed without any notice Page 8 of 9 SAUser TB DPG10A Broch Tech GB doc LE DH Budenberg XIV CONCLUSION Due to its design and its performances the DPG10A primary digital standard is unique in the world The operation with the balance do not nec
14. ly in a cylinder and whose effective area is perfectly known receives a pressure on one of its ends This pressure is balanced with the force which is generated by a mass loaded on the other end of the piston This measuring principle enables the pressure measurement to be directly linked with the primary physical quantities of mass kg length m and time s It is used to establish the pressure References and to develop the high performance Standards As far as the DPG10A is concerned this principle is extrapolated and consists in the association of a similar piston cylinder assembly whose effective area A is perfectly known with a high accuracy electronic measuring force cell which measures the force F and which is placed under a reference vacuum chamber e The vacuum realised on the measuring block and in the reference chamber is around 1 and 2 Pa e The pressure is applied on the piston and turns it linearly into a perfectly proportional force that is transferred to the measuring force cell e Amicroprocessor calculates the force corresponding to the pressure corrects it for all the environmental influences and finally transfers the pressure value to the display and to the communication interface January 2006 The DPG10A pressure standard presented in this brochure is based on a unique technology innovated by DH BUDENBERG More than a thousand standards of this type have been produced It combines the metrological perform
15. m operation Protection by password of the sensitive data Menus in English French German and Spanish Saving of the metrological characteristics for 3 pressure ranges Direct access to the main run screens by pressing function keys from the measurement mode Large LCD back lighting graphic screen with contrast adjustment Membrane keypad with tactile effect and beeper Mechanical protection against overpressure up to 110 Overpressure visual and sound warning Under pressure visual warning Calibration visual warning when the calibration is necessary Visual indicator of the measuring range that has been used bar graph Visual indicators of the setting of the filters Pressure display in 12 pressure units and a user unit User adjustable resolution User adjustable pressure stability criterion Clock Front panel taring key Front panel ACF running key Choice between internal external calibration Environment vibrations filter with 4 adjusting levels Pressure fluctuations filter with 4 adjusting levels Measurement process filter with 4 adjusting levels Information given here in can be changed without any notice Page 7 of 9 SAUser TB DPG10A Broch Tech GB doc hy DH Budenberg Averaging filter with 3 adjusting levels EMM parameters display RS232C communication port for remote control Comprehensive programming language January 2006 Piston cylinder assembly temperature measuring circuit with auto calibration by resistance of integrated reference
16. readjust the deviation of the measuring force cell according to two points zero and the mass generated force value i e the full scale value You can optionally use a set of external standard masses in order to check the measuring force cell linearity over 5 points These masses can also be used to run an external calibration measuring force cell Internal standard Computer connection EMM sensors Information given here in can be changed without any notice SAUser TB DPG10A Broch Tech GB doc Page 4 of 9 hy DH Budenberg 11 5 THE ENVIRONMENT MONITORING MODULE January 2006 In order to determine whether it is worthy to use the ACF the DPG10A is equipped with an Environment Monitoring Module which consists in 3 sensors for ambient temperature relative humidity and barometric pressure and their electronic components After the calibration the EMM keeps on monitoring the evolution of the ambient conditions in real time If these conditions vary in proportions that might noticeably alter the measuring performance the DPG10A displays a warning flag to advise the user to command the ACF in order to readjust the dynamometer to the new operating conditions The warning flag is also sent to the command software if the DPG10A is operated from a remote computer IV DISPLAYED PRESSURE CALCULATION When the ACF is in use the environment conditions for which the measurements carri
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