Differential Pressure and Flowmeter Media 04
Contents
1. liquid level to be measured The pressure line for the higher pressure must be connected to the high pressure chamber of the indicating unit In liquid level measurements according to the bottom left hand schematic 1 the additional hight z is included in the measurement therefore it must be kept to a minimum and must be considered when adjusting zero The dimension K compensating height schematic 2 may be selected to suit the in stallation conditions 2 2 Differential pressure lines The differential pressure lines should have tubes with an external of 12 mm The in stallation should be carried out according to Fig 3 Proper arrangement is absolutely necessary Pipe runs that would normally be installed horizontally should be mounted with a steady slope of not less than 1 20 i e slop ing downward from the point that allows venting The minimum bending radius shall not be less than 50 mm Before the differential pressure lines are con nected to the instrument they shall be flushed thoroughly Make sure that the high pressure line con nects to the high pressure connection and the low pressure line to the low pressure one We recommend that both a shut off valve and also an equalizing valve be installed in each differential pressure line They are used to shut off the two differential pressure lines and short circuit the lines at the indicating unit for checking zero Measuring range Measured heig2. the measuring range can be changed subsequently only within the range permitted by the measuring spring installed The measuring span can be adjusted continu ously up to 60 of the maximum measuring span When a different span is to be adjusted the measuring spring 1 5 must be exchanged See instrument name plate and the table on page 5 4 2 1 Adjusting and changing the measur ing range Figs 2 and 5 Adjustment should preferably be made on the test bench Unscrew the casing front section Adjust zero point at zero adjustment screw 2 6 Apply a pressure to the high pressure side of the measuring cell until the pointer indicates full scale output 100 Read off the pressure value at the checking pressure gauge corre sponds to the adjusted upper measuring range value then remove pressure If the measuring range is to be changed the black adjusting lever 2 3 is to be displaced at the flattened point of the plastics part by turning it either clockwise or counterclock wise see Fig 5 If e g a wider measuring range is desired the adjusting lever 2 3 is to be moved by turning it counterclockwise and downward a little bit away from the center of motion of the toothed segment Correct the zero point at the zero adjustment screw 2 6 and apply again full load to the measuring cell until the pointer shows 100 Check the upper measuring range value at the pressure gauge Should it deviate from the desired mea
3. 12 Washer 2 4 Gear mechanism 1 5 Measuring spring 1 13 Washer s 2 5 Pointer 1 6 Measuring diaphragm 1 14 Screw 2 6 Zero adjustment screw 1 7 Diaphragm plates 1 15 O ring 1 8 Diaphragm shaft 1 16 Spring guide The differential pressure Ap p1 p2 creates a force on the measuring diaphragm 1 6 which is balanced by the measuring spring 1 5 The deflection of the diaphragm 1 6 and the lever 1 11 which is proportional to 2 the differential pressure is transferred from the pressure cell to the flexible washer 1 12 and is transmitted to the pointer mechanism via the adjusting lever 2 3 2 Installation 2 1 Indicating unit At the point of installation fasten the instru ment to the pipe wall or mounting plate free of vibrations For mounting on a vertical or horizontal pipe use the mounting device with clamp for wall mounting use mounting de vice without clamp see dimension drawing section 6 For panel mounting panel cut out 2114 hole circle 120 mm unscrew closing cover and fasten rear cover with measuring cell to panel as shown in the dimension drawing on page 8 Attention For connecting the differential pressure lines cutting ring connections are necessary Moreover the free process fluid connections of the differential pressure cell must be closed by screw or vent plugs see section 5 If the indicating unit is used for level measure ment in vessels Fig 3 it must be arranged below the
4. Differential Pressure and Flowmeter Media 04 Fig 1 Media 04 100 Wirkdruck 100 DurchfluB 1 Design and principle of operation The Media 04 Differential Pressure and Flow meter is used for measuring the differential pressure in industrial plants and building ser vices When used in conjunction with an ori fice plate as differential pressure pick up the instrument indicates the flow rate Edition March 1993 The Media 04 Indicating Unit consists essen tially of the differential pressure cell with measuring diaphragm and measuring spring and the indicating unit with pointer mechanism and scale For application as flowmeter in addition to the indicating instru ment an orifice plate assembly orifice flange or orifice tube is necessary Mounting and operating instructions EB 9538 E ILILILILIL TOE ne ii SS I Sererereroreverarara ater Ee nS RI Ne s l HFA PRSSSSS NR HZ WN 1 lel annn AY SELAA EN Son 1 SNES 8 AT j a0 j f 11 me A E l 2N 7777 NSE 1 12 ap EN ee IN SS 2 1 sa EAS Te maa SEN a amp gay E 2 2 Fig 2 Top view section 2 5 2 6 2 3 1 Differential pressure cell 2 Indicating unit 1 1 Housing 1 9 Guide springs 2 1 Rear cover 1 2 High pressure head 1 10 Connection link 2 2 Closing cover 1 3 Low pressure head 1 11 Lever 2 3 Regulating lever 1 4 Spring plate 1
5. d 6 Adjustment is to be made on the test bench only If the measuring range is to exceed that of the built in measuring spring the measuring spring required shall be selected from the table on page 7 Only the springs suiting the existing measuring cell see name plate can be exchanged Proceed as follows Unscrew closing cover 2 2 and set zero point with adjusting screw 2 6 Loosen screws 1 14 and remove the spring plate 1 4 spring guide 1 16 measuring spring 1 5 and washer s 1 13 from the low pressure side of the measuring cell Install a new spring 1 5 and fasten spring plate with two screws 1 14 Check zero point correct deviation by installing washers of different thickness for oder number see table on page 7 For this purpose the spring plate must be removed each time When zero point is obtained screw on the spring plate firmly check O ring 1 15 for proper position and replace if necessary Adjust the measuring range as described in paragraph 4 2 1 Note on oxygen versions O2 Instruments for oxygen measurement are provided with a label Oxygen Keep free from oil and grease These versions have been assembled by the manufacturer under special conditions and have been washed afterwards Use suitable gloves when exchanging parts which have contact with oxygen e g measuring springs 6 Fig 6 Measuring range spring 5 Connection accessories The instruments are d
6. e connection M8 threaded holes for fastening to a sheet plate 130 low pressure connection Center line of the indicating unit high pressure connection Sg Panel cut out SAMSON AG MESS UND REGELTECHNIK WeismiillerstraBe 3 D 60314 Frankfurt am Main Postfach 10 19 01 D 60019 Frankfurt am Main Telefon 0 69 4 00 90 Telefax 0 69 4 00 95 07 EB 9538 E S C 08 94
7. e that air in clusions can escape into the pipeline Sl am ccc Fig 4 Orifice plate position 3 Start up Check zero point prior to start up If necess ary correct it at the zero adjustment screw 2 6 Then slowly open the shut off valves to fill the system so that the air in the dia phragm chambers can escape 4 Correcting zero If shut off and equalizing valves are installed in the differential pressure lines the zero point can also be checked when the system is being operated First close shut off valve in the low pressure line then open equalizing valve and close shut off valve in the high pressure line The pointer 2 5 must be positioned at zero Otherwise adjust the zero adjustment screw 2 6 until the zero position is reached To place into service first open the shut off valve in the high pressure line and then close the equalizing valve Finally open the shut off valve in the low pressure line 4 2 Measuring span measuring range The measuring span of the differential press ure flowmeter is determined by the differen tial pressure cell three versions different measuring diaphragms 1 6 and guide spring 1 9 on the one hand and by the measuring spring 1 5 installed on the other hand The version of the measuring dia phragm and guide spring is printed on the name plate The instrument is set by the manufacturer to the measuring range specified in the order and
8. elivered without process fluid connections Required cutting ring con nections screw and vent plugs or throttles for damping of any oscillations caused by the measured medium especially for gas meas urement must be ordered separately N N NY NY NY YN NY N N Number Designation Connections for tube 12 steel Connections for tube 12 Niro Connections for tube 10 steel Connections for tube 8 steel Connections for tube 12 with throttle steel Connections for tube 8 with throttle steel Connections for tube 6 with throttle steel Connections with throttle special version for measurement of liquefied gas Vent plugs brass with gaskets Screw plugs brass with gaskets Screw plug half set brass with gasket Gaskets Mounting device for tube mounting Order no Standard Rinsed for O2 1400 5842 1400 5843 1400 5844 1400 5845 1400 5846 1400 5847 1400 5860 1400 5861 1400 5848 1400 5849 1400 5850 1400 5851 1400 5852 1400 5853 1400 5858 1400 5654 1400 5658 1400 5655 1400 5659 1400 5662 1400 5663 1400 5660 1400 5661 1400 5656 6 Dimensions in mm Tube mounting Vertical tube Horizontal tube Process fluid be 190 re Wall mounting Mounting device 10 2h 7i fe line of the indicating unit 088 110 connection R 3 8 Process fluid connections high pressure j 30 connection low pressur
9. ht Additional height Compensating height AN bm vy Shut off valve de Equalizing valve FES a Measurement on pressure vessels with conden sating or non condensating pressure cushion Measurement on open vessel with submerged ammeter Measurement with cryogenic plants liquefied gases Fig 3 Installation schematics e g liquid level measurement 2 3 Differential pressure pick up orifice flange or orifice tube for flow measurement Before installing the differential pressure pick up make sure that the pipeline upstream and downstream of the standard orifice runs properly For she straight part of pipeline be hind the orifice a length of 5 D suffices D is the internal pipe diameter The required length of the straight pipe run upstream of the orifice depends on the aperture ratio m and should amount to approximately L 130m 5 D d2 The aperture ratio m DZ where d is the orifice diameter The high pressure tap is to be located up stream of the orifice whereas the low press ure tap is to be downstream of the orifice The sharp edge of the standard orifice must be on the orifice inlet side directed against the medium flow Fig 4 The differential pressure lines copper tube 12 x 1 are to be installed with a constant downward slope from the differential pressure pick up The indicating unit therefore should be ar ranged below the pipe to ensur
10. suring range repeat adjust ment procedure as described above until zero point and upper range value are cor rect Should the measuring range be changed considerably the zero point may drift out of its adjustment range In this case try to adjust the mid value of the adjustment range by turning the zero adjustment screw Then remove pointer using a suitable pulling off device and reinstall it on the shaft at the posi tion Zero Se oe A Adjusting lever 2 3 Narrower measuring range oe Turn clockwise SA i Mi Fig 5 Measuring range A Turn counterclockwise adjustment Wider measuring range Measuring cell Measuring range mbar Measuring spring min max Wire Length Order no mm 0 1 mm Oto 40 Oto 60 1 2 34 4 1400 5871 1 Oto 60 Oto 100 1 2 32 7 1400 5872 Diaphragm 0 4 52 Oto 100 Oto 160 1 8 32 2 1400 5873 Guide spring 0 5 Oto 160 0 to 250 2 25 32 1400 5874 0 to 250 Oto 400 2 5 31 9 1400 5875 O to 400 0 to 600 2 8 31 7 1400 5876 2 Oto 250 0 to 400 2 25 32 4 1400 5879 Diaphragm 0 4 70 O to 400 0 to 600 2 5 32 2 1400 5880 Guide spring 0 8 0t0 600 Oto 1000 3 31 8 1400 5881 O to 1000 O to 1600 3 4 31 6 1400 5882 3 Diaphragm 0 6 70 O to 1600 0 to 2500 3 6 31 6 1400 5885 Guide spring 0 8 Part Designation Order no 1 13 Washers 1400 5653 1 15 O ring 22 x 2 ECO 8421 0080 4 2 2 Changing the measuring range by ex changing the measuring spring Figs 2 an
Download Pdf Manuals
Related Search