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42

6-2.  Liquid level transmission

The operation method (start up procedure) described here assumes that the meter body has 
been installed as shown in “5-9-1: Model 11/22/33/44/81/82” (6) and “5-9-2: Connection of 
flange type meter body to process” of “Chapter 5 : Installation”. No operation procedure is 
needed for the process connections with flanges (diaphragms). Of model 71 or 72, operation is 
ready when its installation has been completed.
(1)  Check that piping has been correctly done.
(2)   Unless self drain or self vent piping has been provided, liquid or gas will be entrapped in 

the measuring chambers and pressure connection pipes, thereby causing measurement 
errors. Be sure to purge any remaining liquid or gas. For this procedure, refer to “Chapter 
7 : Inspection and Maintenance”.

(3)  Zero point check:
     When the instrument has become ready for measuring, prepare a receiver instrument and 

check and adjust the zero point.

(4)   Open the stop valves and start operating the instrument. If seal liquid is used, fill the low 

pressure side tapping-pipe with seal liquid.

Содержание KDP

Страница 1: ...OM2 5220 1101 PREX3000 Pneumatic Differential Pressure Transmitter Model KDP User s Manual...

Страница 2: ...s for a particular purpose and makes no express warranty except as may be stated in its written agreement with and for its customer In no event shall Azbil Corporation be liable to anyone for any indi...

Страница 3: ...mosphere 4 2 5 3 Vibration and shock 4 2 6 Pressure application 4 Chapter 3 Wiring 5 3 1 General 5 3 2 Specifications 6 3 2 1 Standard specifications 6 3 2 2 Max working pressure 10 3 2 3 Optional spe...

Страница 4: ...on 37 5 10 2 Setting of elevation suppression 37 Chapter 6 Operation Method 41 6 1 Differential pressure Flow transmission 41 6 2 Liquid level transmission 42 Chapter 7 Inspection and Maintenance 43 7...

Страница 5: ...ns for the PREX3000 Differential Transmitter Be sure to read this manual before using the instrument This manual has been written for instruments with the standard specifications Note that some items...

Страница 6: ...2...

Страница 7: ...he place of installation it is best if it is packed as it was shipped from the factory 2 4 Storing the instrument 1 Store the instrument in a place where the instrument is not exposed to rain or other...

Страница 8: ...possibility of the measured fluid freezing provide a heat insulator or take appropriate measures to prevent freezing 2 5 2 Atmosphere Avoid as much as possible installing the instrument in a corrosive...

Страница 9: ...rts a process differential pressure or a pressure into pneumatic signals 20 to 100 kPa 0 2 to 1 0 kgf cm2 The transmitter consists of a transmitting section and a detecting section meter body Transmit...

Страница 10: ...KDP33 0 0 5 to 0 6 kPa 0 50 to 0 600 mmH2O Very low P KDP44 0 0 1 to 0 1 2 kPa 0 10 to 0 120 mmH2O Process connection KDP11 22 33 44 KDP61 62 Flange Rc1 2 PT1 2 internal thread KDP81 82 Rc1 4 PT1 4 in...

Страница 11: ...than 500 mmH2O KDP33 0 5 F S For span 1 0 to 6 kPa 100 to 600 mmH2O 1 0 F S For span 0 5 to less than 1 kPa 50 to less than 100 mmH2O KDP44 0 5 F S For span 0 2 to 1 2 kPa 20 to 120 mmH2O 1 0 F S For...

Страница 12: ...10K up to 1 4 MPa 14 kgf cm2 JIS30K up to 5 1 MPa 51 kgf cm2 ANSI150 up to 1 4 MPa 14 kgf cm2 ANSI300 up to 3 7 MPa 37 kgf cm2 10 kPa to 1 5 MPa 0 1 to 15 kgf cm2 KDP71 72 KDP81 82 50 kPa to 42 MPa 0...

Страница 13: ...2 3 5 m remote seal type SUS316 Mounting KDP11 12 On vertical or horizontal 2 inch pipe KDP33 44 Horizontal 2 inch pipe KDP61 62 Directly flange mounted to process flange KDP71 72 Directly flange moun...

Страница 14: ...Carbon steel 6 0 5 0 4 0 3 0 2 0 1 0 0 0 Max Working Pressure MPa 30K 20K 10K 6 0 5 0 4 0 3 0 2 0 1 0 0 0 Max Working Pressure MPa Class 300 Class 150 SUS304 6 0 5 0 4 0 3 0 2 0 1 0 0 0 Max Working Pr...

Страница 15: ...P81 25 to 500 2 500 to 50 000 500 50 000 475 47 500 KDP82 2 5 to 53 9 250 to 5 500 53 9 5 500 51 4 5 250 Note elevation span maximum span Air set filter and pressure regulator All models Primary press...

Страница 16: ...eel SF45A 2 SUS316 3 Monel 5 PVC 1 Carbon steel SF45A 2 SUS316 3 Monel 5 PVC 2 SUS316 diaphragm SUS316L 3 Monel 4 Tantalum 8 SUS316L 2 SUS316 diaphragm SUS316 3 Monel 4 Tantalum 8 SUS316L A Rc1 4 PT1...

Страница 17: ...VC 1 Carbon steel SF45A 2 SUS316 3 Monel 5 PVC 2 SUS316 diaphragm SUS316L 3 Monel 4 Tantalum 8 SUS316L 2 SUS316 diaphragm SUS316 3 Monel 4 Tantalum 8 SUS316L A PT1 4 internal thread B 1 4NPT internal...

Страница 18: ...2O 1 Carbon steel SF45A 2 SUS316 1 Carbon steel SF45A 2 SUS316 2 SUS316 diaphragm SUS316L 2 SUS316 diaphragm SUS316 A PT1 4 internal thread B 1 4NPT internal thread 1 kgf cm2 or mmH2O 0 2 to 1 0 kgf c...

Страница 19: ...16L 1 Flush diaphragm type 80 mm JIS 10K RF equiv flange 2 Flush diaphragm type 80 mm JIS 30K RF equiv flange 3 Flush diaphragm type 3 in ANSI150 RF equiv flange 4 Flush diaphragm type 3 in ANSI300 RF...

Страница 20: ...JIS 10K RF equiv flange 2 Flush diaphragm type 80 mm JIS 30K RF equiv flange 3 Flush diaphragm type 3 in ANSI150 RF equiv flange 4 Flush diaphragm type 3 in ANSI300 RF equiv flange 5 Extended diaphra...

Страница 21: ...O 1 Carbon steel SF45A 2 SUS316 1 Carbon steel SF45A 2 SUS316 2 SUS316 diaphragm SUS316L 3 Monel 4 Tantalum 8 SUS316L 2 SUS316 diaphragm SUS316 3 Monel 4 Tantalum 8 SUS316L A PT1 4 internal thread B 1...

Страница 22: ...ed on the base plate side and the flapper is mounted at the end of the beam 3 4 2 Pilot relay The pilot relay boosts the back pressure of the nozzle The pilot relay is mounted on the manifold which is...

Страница 23: ...nsmitter Extended flange type Flange adaptor Bracket Model 71 72 Model 81 82 Remote sealed capillary tube Meter body coupled to transmitter Fig 3 3 External views of meter bodies The meter body consis...

Страница 24: ...82 The high and low process pressures HP and LP are fed via diaphragms and to the center section oil filled section of the meter body The HP acts on the differential pressure detecting bellows from th...

Страница 25: ...ibrium is reached zero differential pressure state identical forces are exercised on both sides of the differential pressure detecting diaphragm As the pressure of the HP side rises the support moves...

Страница 26: ...on of the meter body The bellows moves proportional to the liquid head pressure The movement of the bellows is fed as a torque via the plunger and torque arm to the beam of the transmitter 6 1 1 8 9 1...

Страница 27: ...m and liquid fill to the bellows The bellows moves in proportion to the differential pressure between HP and LP The movement of the bellows is fed as a torque via the torque rod to the beam of the tra...

Страница 28: ...24...

Страница 29: ...fed as vector F1 to the beam through the strap as shown in Fig 4 1 thereby making up a negative feedback loop to balance the output air pressure at a valve proportional to the input For elevation or...

Страница 30: ...26...

Страница 31: ...s being measured be careful of freezing which may cause damage to the meter body Take appropriate measures to guard against freezing 2 Select a place where is reasonably free from humidity and vibrati...

Страница 32: ...not sway See Fig 5 2 To install the meter body in a process pipe line prepare brackets for mounting the 2 in pipe to the process pipe See Fig 5 3 When installing a remote sealed type of meter body ex...

Страница 33: ...proceed as follows 1 Connect the tapping flange to the process flange with the bolts and gasket Evenly tighten the bolts to prevent leakage Lay the capillary tube so that it is not subjected to much t...

Страница 34: ...al After installation is finished perform ZERO adjustment Note Refer to the section for calibration When a diaphragm pressure receiver type of meter body models 61 62 71 72 is used for liquid level me...

Страница 35: ...rnal thread which is marked SUP The port marked OUT is the output air connection port If an Airset is used connect the output port of the Airset to the air supply connection port of the transmitter Th...

Страница 36: ...s Blow valve Manifold valve piping Blow piping Fig 5 8 Blow piping 3 For the pressure connection piping from the pressure tap position to the transmitter provide a gradient so that drainage is returne...

Страница 37: ...nge or union Tee Drain plug gate or globe valve Vent plug Tee Must be at the same level Slope Slope Manifold valve Vent plug Socket Manifold valve Vent plug Slope Slope B Gas C Liquid meter body locat...

Страница 38: ...for liquid level measurement The liquid level corresponding to the difference between the 0 level and the center of the meter body is given from the beginning In the case of A or B as shown in Fig 5 1...

Страница 39: ...rain pot Blow valve Stop valve Drain pot Blow valve Stop valve P P Tank Tank h Fig 5 11 process connections of model 61 62 for liquid level measurement L H L H Maximum liquid level Minimum liquid leve...

Страница 40: ...For flow measurement with Venturi tube Fig 5 13 Pressure tapping for model 71 and 72 for flow measurement 1 Fix the flanges of the meter body to those of the process side by using gaskets and bolts B...

Страница 41: ...initions of elevation and suppression The terms elevation and suppression used in this manual are defined as follows Elevation Synonymous with suppressed zero range An input range whose low end value...

Страница 42: ...gher than the center position of the diaphragm provide elevation by an amount that corresponds to the height multiplied by the specific gravity of the measured liquid Fig 5 15 B 71 72 Provide elevatio...

Страница 43: ...l liquid 0 935 Specific gravity of the seal liquid Zero liquid level L E Provide elevation by E B Zero liquidlevel H L E 1 2 L E 1 2 S C C Provide suppression by 2 S 1 E Zero liquid level L E2 E1 D Pr...

Страница 44: ...40...

Страница 45: ...procedure refer to Chapter 7 Inspection and Maintenance 3 Zero point check When the instrument is ready for measuring prepare a receiver instrument and check and adjust the zero point as follows For m...

Страница 46: ...ompleted 1 Check that piping has been correctly done 2 Unless self drain or self vent piping has been provided liquid or gas will be entrapped in the measuring chambers and pressure connection pipes t...

Страница 47: ...the high pressure side of the manifold valve 2 Ensure that the equalizer valve is closed 3 Close the stop valve on the low pressure side tapping pipe and that of the low pressure side of the manifold...

Страница 48: ...to purge gas at appropriate intervals 3 For a closed tank liquid level meter of liquid sealed type check the seal liquid level and replace seal liquid at appropriate intervals To replace seal liquid p...

Страница 49: ...olt Cover 11 22 61 62 450 300 Chrome molybdenum steel Carbon steel SUS 33 450 300 44 400 81 82 1400 7 2 3 Notes for use in freezing weather When the transmitter used for the measurement of water or of...

Страница 50: ...46...

Страница 51: ...ot relay on the manifold by setting the guide pin at the bottom of the pilot relay to the guide hole and tighten the screws evenly 8 2 To service the pilot relay Remove the pilot relay as described in...

Страница 52: ...t relay No Name Quantity No Name Quantity 1 Screw 3 11 Diaphragm lower 1 2 Valve stem 1 12 Exhaust ring outer 1 3 Housing 1 13 Exhaust ring inner 1 4 Guide pin 6 14 Area plate 1 5 Conical spring 1 15...

Страница 53: ...ked L to atmosphere 2 Connect the high pressure connection port marked H to a variable pressure source such as an air supply via a regulator corresponding to the measuring range and a precision pressu...

Страница 54: ...he boss so that the output becomes higher than 100 by an amount of 1 4 of the shift For example if the output is 98 turn the boss so that the output becomes 100 1 2 2 100 5 The span can be adjusted al...

Страница 55: ...ues with the elevation suppression taken into consideration 9 3 1 Setting of elevation When all adjustment without elevation has been completed install the elevation spring assembly on the bass plate...

Страница 56: ...52...

Страница 57: ......

Страница 58: ...equired to check the functions and safety of your Equipment prior to your use 3 Measures to be taken to secure the required level of the reliability and safety of your Equipment in your use Although a...

Страница 59: ...struction manuals or depending on the design margin of your machine or equipment you are required to renew any Azbil Corporation s products every 5 to 10 years unless otherwise specified in specificat...

Страница 60: ......

Страница 61: ...Document Number OM2 5220 1101 Document Name PREX3000 Pneumatic Differential Pressure Transmitters Model KDP User s Manual Date 1st edition Oct 1998 8th edition June 2022 Issued Edited by...

Страница 62: ......

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