.bmp)
Universal Valve for controoling flow such as water, milk, and oil. aplication technology for Dairy factory. its recomended for special uage in high qality standart
Sabtu, 28 Februari 2009
Valve Operation from Goyen
.bmp)
Mechanical InstallationThe DD valves series valves allow the valve to be directly installed onto the inlet and outlet pipes without additional flange or pipe threads. Installation is achieved through compression nuts that provide an airtight seal. Valve must be independently restrained. These valves offer the same high performance as the "T" series valve with the same right angle construction. The valves may be operated either by integral pilot solenoid (CA models) or remote pilot solenoids (RCA models)
Typical Inlet Installation
The flange mount of the valve may be oriented to the pressure vessel as illustrated below.
Never mount the valve on the underside of the header or upside-down as this allows
the accumulation of moisture in the valve, which is detrimental to performance
Electrical Installation
To operate these main valve assemblies:
RCA versions should use Goyen pilot solenoid RCA3D, which can be electrically operated in a remote location.
CA versions are directly mounted with pilot operator.
* Refer to “Drawing Download” section for complete drawings and CAD downloads.
Operating Pressure Range all DD Valves
Maximum operating pressure 860 kPa (125 psi)
Recommended operating pressure 760 kPa (110 psi)
Minimum operating pressure30 kPa (5 psi)
Electrical Pulse times
Electrical "on time" ranges between 50 m sec to 500 m sec
Start-up Procedure for correct installation of GOYEN DD series valves ensure the following checks are satisfied:
ensure valves are fully secured in position
ensure dresser nuts are tightened to - 20nm (15 ft/lbs)
ensure blowtube is secured adequately to the valve outlet and reverse pulse filter wall.
the required air pressure has been applied to the header tank, ensuring compressed air is dry and free of particulates.
all joints around the valve installation do not leak air.
check the electrical connection at the remote pilot solenoid valve or on board the valve.
check valve exhaust outlet for adequate venting and noise suppression. in case of turbine applications, protection against particulate / vermin inclusions should be incorporated.
switch electrical control to continuous cycle and observe for several operating cycles. check for the correct valve opening sequence.
Fault Finding & Diagnostics, DD valve fails to open:
Check electrical signal to RCA or CA operator coil
Check for adequate air pressure and that it is present at inlet of the valve.
Check exhausts are free from obstructions
DD valve has resonance noise evident.
Check excessive silencer restriction in exhaust outlets
Check partial blockages of bleed paths
Check supply header capacity
DD valve fails to close
Check that pilot is closing
Check for blockages of bleed path
Check for diaphragm damage either in the membrane or seat
Schedule maintenance should be applied, however it is recommended that full inspection be
carried out within 2 years of service life.
RCA/CA operator kit K0380
Standard Coil kits Refer Coil Options
Diaphragm kits:
RCA/CA20DD k2000 Standard K2007 Viton
RCA/CA25DD K2501 Standard K2503 Viton
RCA/CA45DD K4502 Standard K4503
Minggu, 22 Februari 2009
Pressure measurement priciples
The determination of the magnitude of a fluid force applied to a unit area. Pressure measurements are generally classified as gage pressure, absolute pressure, or differential pressure.Pressure gages generally fall in one of three categories, based on the principle of operation: liquid columns, expansible-element gages, and electrical pressure transducers. Liquid-column gages include barometers and manometers. They consist of a U-shaped tube partly filled with a nonvolatile liquid. Water and mercury are the two most common liquids used in this type of gage. There are three classes of expansible metallic-element gages: bourdon, diaphragm, and bellows. Bourdon-spring gages, in which pressure acts on a shaped, flattened, elastic tube, are by far the most widely used type of instrument. These gages are simple, rugged, and inexpensive. In diaphragm-element gages, pressure applied to one or more contoured diaphragm disks acts against a spring or against the spring rate of the diaphragms, producing a measurable motion. In bellows-element gages, pressure in or around the bellows moves the end plate of the bellows against a calibrated spring, producing a measurable motion. Electrical pressure transducers convert a pressure to an electrical signal which may be used to indicate a pressure or to control a process. Such devices as strain gages and resistive, magnetic, crystal, and capacitive pressure transducers are commonly used to convert the measured pressure to an electrical signal.
The determination of the magnitude of a fluid force applied to a unit area. Pressure measurements are generally classified as gage pressure, absolute pressure, or differential pressure. Pressure gages generally fall in one of three categories, based on the principle of operation: liquid columns, expansible-element gages, and electrical pressure transducers. Liquid-column gages include barometers and manometers. They consist of a U-shaped tube partly filled with a nonvolatile liquid. Water and mercury are the two most common liquids used in this type of gage. There are three classes of expansible metallic-element gages: bourdon, diaphragm, and bellows. Bourdon-spring gages, in which pressure acts on a shaped, flattened, elastic tube, are by far the most widely used type of instrument. These gages are simple, rugged, and inexpensive. In diaphragm-element gages, pressure applied to one or more contoured diaphragm disks acts against a spring or against the spring rate of the diaphragms, producing a measurable motion. In bellows-element gages, pressure in or around the bellows moves the end plate of the bellows against a calibrated spring, producing a measurable motion. Electrical pressure transducers convert a pressure to an electrical signal which may be used to indicate a pressure or to control a process. Such devices as strain gages and resistive, magnetic, crystal, and capacitive pressure transducers are commonly used to convert the measured pressure to an electrical signal.
Pressure transducer
Pressure transducer is An instrument component which detects a fluid pressure and produces an electrical, mechanical, or pneumatic signal related to the pressure.
In general, the complete instrument system comprises a pressure-sensing element such as a bourdon tube, bellows, or diaphragm element; a device which converts motion or force produced by the sensing element to a change of an electrical, mechanical, or pneumatic parameter; and an indicating or recording instrument. Frequently the instrument is used in an autocontrol loop to maintain a desired pressure.
Although pneumatic and mechanical transducers are commonly used, electrical measurement of pressure is often preferred because of a need for long-distance transmission, higher accuracy requirements, more favorable economics, or quicker response. Electrical pressure transducers may be classified by the operating principle as resistive transducers, strain gages, magnetic transducers, crystal transducers, capacitive transducers, and resonant transducers.
In resistive pressure transducers, pressure is measured by an element that changes its electrical resistance as a function of pressure. Many types of resistive pressure transducers use a movable contact, positioned by the pressure-sensing element. One form is a contact sliding along a continuous resistor, which may be straight-wire, wire- wound, or nonmetallic such as carbon.
Strain-gage pressure transducers might be considered to be resistive transducers, but are usually classified separately, They convert a physical displacement into an electrical signal. When a wire is placed in tension, its electrical resistance increases. The change in resistance is a measure of the displacement, hence of the pressure. Another variety of strain gage transducer uses integrated circuit technology. Resistors are diffused onto the surface of a silicon crystal within the boundaries of an area which is etched to form a thin diaphragm.
In magnetic pressure transducers, a change of pressure is converted into change of magnetic reluctance or inductance when one part of a magnetic circuit is moved by a pressure-sensing element—bourdon tube, bellows, or diaphragm.
Piezoelectric crystals produce an electric potential when placed under stress by a pressure-sensing element. Crystal transducers offer a high speed of response and are widely used for dynamic pressure measurements in such applications as ballistics and engine pressures.
Capacitive pressure transducers almost invariably sense pressure by means of a metallic diaphragm, which is also used as one plate of a capacitor.
The resonant transducer consists of a wire or tube fixed at one end and attached at the other (under tension) to a pressure-sensing element. The wire is placed in a magnetic field and allowed to oscillate. As the pressure is increased, the element increases the tension in the wire or tube, thus raising its resonant frequency
In general, the complete instrument system comprises a pressure-sensing element such as a bourdon tube, bellows, or diaphragm element; a device which converts motion or force produced by the sensing element to a change of an electrical, mechanical, or pneumatic parameter; and an indicating or recording instrument. Frequently the instrument is used in an autocontrol loop to maintain a desired pressure.
Although pneumatic and mechanical transducers are commonly used, electrical measurement of pressure is often preferred because of a need for long-distance transmission, higher accuracy requirements, more favorable economics, or quicker response. Electrical pressure transducers may be classified by the operating principle as resistive transducers, strain gages, magnetic transducers, crystal transducers, capacitive transducers, and resonant transducers.
In resistive pressure transducers, pressure is measured by an element that changes its electrical resistance as a function of pressure. Many types of resistive pressure transducers use a movable contact, positioned by the pressure-sensing element. One form is a contact sliding along a continuous resistor, which may be straight-wire, wire- wound, or nonmetallic such as carbon.
Strain-gage pressure transducers might be considered to be resistive transducers, but are usually classified separately, They convert a physical displacement into an electrical signal. When a wire is placed in tension, its electrical resistance increases. The change in resistance is a measure of the displacement, hence of the pressure. Another variety of strain gage transducer uses integrated circuit technology. Resistors are diffused onto the surface of a silicon crystal within the boundaries of an area which is etched to form a thin diaphragm.
In magnetic pressure transducers, a change of pressure is converted into change of magnetic reluctance or inductance when one part of a magnetic circuit is moved by a pressure-sensing element—bourdon tube, bellows, or diaphragm.
Piezoelectric crystals produce an electric potential when placed under stress by a pressure-sensing element. Crystal transducers offer a high speed of response and are widely used for dynamic pressure measurements in such applications as ballistics and engine pressures.
Capacitive pressure transducers almost invariably sense pressure by means of a metallic diaphragm, which is also used as one plate of a capacitor.
The resonant transducer consists of a wire or tube fixed at one end and attached at the other (under tension) to a pressure-sensing element. The wire is placed in a magnetic field and allowed to oscillate. As the pressure is increased, the element increases the tension in the wire or tube, thus raising its resonant frequency
Pressure transducer
Pressure transducer of An instrument component which detects a fluid pressure and produces an electrical, mechanical, or pneumatic signal related to the pressure.
In general, the complete instrument system comprises a pressure-sensing element such as a bourdon tube, bellows, or diaphragm element; a device which converts motion or force produced by the sensing element to a change of an electrical, mechanical, or pneumatic parameter; and an indicating or recording instrument. Frequently the instrument is used in an autocontrol loop to maintain a desired pressure.
Although pneumatic and mechanical transducers are commonly used, electrical measurement of pressure is often preferred because of a need for long-distance transmission, higher accuracy requirements, more favorable economics, or quicker response. Electrical pressure transducers may be classified by the operating principle as resistive transducers, strain gages, magnetic transducers, crystal transducers, capacitive transducers, and resonant transducers. In resistive pressure transducers, pressure is measured by an element that changes its electrical resistance as a function of pressure. Many types of resistive pressure transducers use a movable contact, positioned by the pressure-sensing element. One form is a contact sliding along a continuous resistor, which may be straight-wire, wire-wound, or nonmetallic such as carbon. Strain-gage pressure transducers might be considered to be resistive transducers, but are usually classified separately, They convert a physical displacement into an electrical signal. When a wire is placed in tension, its electrical resistance increases. The change in resistance is a measure of the displacement, hence of the pressure. Another variety of strain gage transducer uses integrated circuit technology. Resistors are diffused onto the surface of a silicon crystal within the boundaries of an area which is etched to form a thin diaphragm. In magnetic pressure transducers, a change of pressure is converted into change of magnetic reluctance or inductance when one part of a magnetic circuit is moved by a pressure-sensing element—bourdon tube, bellows, or diaphragm. Piezoelectric crystals produce an electric potential when placed under stress by a pressure-sensing element. Crystal transducers offer a high speed of response and are widely used for dynamic pressure measurements in such applications as ballistics and engine pressures. Capacitive pressure transducers almost invariably sense pressure by means of a metallic diaphragm, which is also used as one plate of a capacitor. The resonant transducer consists of a wire or tube fixed at one end and attached at the other (under tension) to a pressure-sensing element. The wire is placed in a magnetic field and allowed to oscillate. As the pressure is increased, the element increases the tension in the wire or tube, thus raising its resonant frequency.
In general, the complete instrument system comprises a pressure-sensing element such as a bourdon tube, bellows, or diaphragm element; a device which converts motion or force produced by the sensing element to a change of an electrical, mechanical, or pneumatic parameter; and an indicating or recording instrument. Frequently the instrument is used in an autocontrol loop to maintain a desired pressure.
Although pneumatic and mechanical transducers are commonly used, electrical measurement of pressure is often preferred because of a need for long-distance transmission, higher accuracy requirements, more favorable economics, or quicker response. Electrical pressure transducers may be classified by the operating principle as resistive transducers, strain gages, magnetic transducers, crystal transducers, capacitive transducers, and resonant transducers. In resistive pressure transducers, pressure is measured by an element that changes its electrical resistance as a function of pressure. Many types of resistive pressure transducers use a movable contact, positioned by the pressure-sensing element. One form is a contact sliding along a continuous resistor, which may be straight-wire, wire-wound, or nonmetallic such as carbon. Strain-gage pressure transducers might be considered to be resistive transducers, but are usually classified separately, They convert a physical displacement into an electrical signal. When a wire is placed in tension, its electrical resistance increases. The change in resistance is a measure of the displacement, hence of the pressure. Another variety of strain gage transducer uses integrated circuit technology. Resistors are diffused onto the surface of a silicon crystal within the boundaries of an area which is etched to form a thin diaphragm. In magnetic pressure transducers, a change of pressure is converted into change of magnetic reluctance or inductance when one part of a magnetic circuit is moved by a pressure-sensing element—bourdon tube, bellows, or diaphragm. Piezoelectric crystals produce an electric potential when placed under stress by a pressure-sensing element. Crystal transducers offer a high speed of response and are widely used for dynamic pressure measurements in such applications as ballistics and engine pressures. Capacitive pressure transducers almost invariably sense pressure by means of a metallic diaphragm, which is also used as one plate of a capacitor. The resonant transducer consists of a wire or tube fixed at one end and attached at the other (under tension) to a pressure-sensing element. The wire is placed in a magnetic field and allowed to oscillate. As the pressure is increased, the element increases the tension in the wire or tube, thus raising its resonant frequency.
Operating Element of pressure transmitter
.bmp)
The digital display is delivered already mounted when it is ordered with the instrument. In this ase the digital display with the retaining ring must be removed before operating. If you want to order an digital display at a later date, then please observe the instructions in Section 6.3 "Mounting the digital display". Removing the display:· Push up the latch with the arrow until the grip of the retaining ring on the electronic insert is heard to click.
· Loosen the retainer ring and lift off carefully to prevent the display cable from breaking.
· For reading the display during operation, plug the display onto the edge of the housing or let it hang down loosely by its cable next to the housing.
Function of the display
The digital display has two types of display:
· Display in measurement mode: This is shown as standard
· Display in calibration mode: This is shown after pressing the Zero or Span key once.
It returns automatically to measurement mode after 2 seconds.
· Display in measurement mode: This is shown as standard
· Display in calibration mode: This is shown after pressing the Zero or Span key once.
It returns automatically to measurement mode after 2 seconds.
Operation using Commuwin II
When operating using the Commuwin II display and operating program the Cerabar M is calibrated and operated:
· via an operating matrix or
· via the graphics operating mode.
The appropriate server (e.g. HART or ZA 672) must be activated. A description of the Commuwin II operating program is found in the operating manual BA 124F. Operating matrix The advanced functions of the Cerabar M can be accessed in this operating mode in the menu.
· Each row is assigned to a function group.
· Every field displays a parameter.
The calibrating parameters are entered in the appropriate fields.
· via an operating matrix or
· via the graphics operating mode.
The appropriate server (e.g. HART or ZA 672) must be activated. A description of the Commuwin II operating program is found in the operating manual BA 124F. Operating matrix The advanced functions of the Cerabar M can be accessed in this operating mode in the menu.
· Each row is assigned to a function group.
· Every field displays a parameter.
The calibrating parameters are entered in the appropriate fields.
Operating with the HART protocol via Universal HART Communicator DXR 271
When operating with the HART protocol an interactive menu operation derived from the matrix is used (see also the appropriate operating manual for the handheld terminal).
· The menu "Group Select" calls up the matrix.
· The bar lines display the menu headings.
· Parameters are set using submenus.
pressure transmitter measures from ndle Hauser
.bmp)
The Cerabar M pressure transmitter measures the pressure of gases, vapours and liquids and is used in all areas of chemical and process engineering. Operating principle Ceramic sensor The system pressure acts directly on the rugged ceramic diaphragm of the pressure sensor deflecting it by a maximum of 0.025 mm (0.0098 in). A pressure-proportional change in the is measured by the electrodes on the ceramic substrate and diaphragm. The measuring range is determined by the thickness of the ceramic diaphragm.
Metal sensor
The process pressure deflects the separating diaphragm with a filling liquid transmitting the pressure to a resistance bridge. The bridge output voltage, which is proportional to pressure, is then measured and processed.
The process pressure deflects the separating diaphragm with a filling liquid transmitting the pressure to a resistance bridge. The bridge output voltage, which is proportional to pressure, is then measured and processed.
The complete measuring system consists of
· Cerabar M pressure transmitter with 4…20 mA signal output with superposed digital signal (HART communication) and power supply 11.5…45 VDC, in Ex area 11.5…30 VDC.
· Cerabar M pressure transmitter with 4…20 mA signal output with superposed digital signal (HART communication) and power supply 11.5…45 VDC, in Ex area 11.5…30 VDC.
Operation can be carried out via:
· a digital display for operating and calling up measured values locally,
· the universal handheld HART Communicator DXR 275,
· the Endress+Hauser Commuwin II operating program.
· a digital display for operating and calling up measured values locally,
· the universal handheld HART Communicator DXR 275,
· the Endress+Hauser Commuwin II operating program.
electrical Connection
Transposed, screened two-wire cabling is recommended for the connecting cable. Max. wire diameter: 2.5 mm2 permanently attached cable The power supply voltage is:
· Non-Ex: 11.5…45 VDC
· Ex i area: 11.5…30 VDC
Internal protection circuits against reverse polarity, HF interference and overvoltage peaks (see TI 241F "EMC Guidelines"). A test signal can be measured using the terminal plugs for this purpose without interrupting measurement. Cable connection · Unscrew the cover
· If present, remove the retainer ring with analogue display. In addition:
– Push up the latch with the arrow until the grip of the retaining ring is audibly released.
– Loosen the retainer ring carefully to prevent the display cable from breaking. The plug of the display can remain plugged in.
· Insert the cable through the cable entry
· Connect the cable wires as shown in the connection diagram.
· Where appropriate, replace the retainer ring with analogue display. The grip of the retainer ring clips in with an audible click.
· Screw down the cover
Transposed, screened two-wire cabling is recommended for the connecting cable. Max. wire diameter: 2.5 mm2 permanently attached cable The power supply voltage is:
· Non-Ex: 11.5…45 VDC
· Ex i area: 11.5…30 VDC
Internal protection circuits against reverse polarity, HF interference and overvoltage peaks (see TI 241F "EMC Guidelines"). A test signal can be measured using the terminal plugs for this purpose without interrupting measurement. Cable connection · Unscrew the cover
· If present, remove the retainer ring with analogue display. In addition:
– Push up the latch with the arrow until the grip of the retaining ring is audibly released.
– Loosen the retainer ring carefully to prevent the display cable from breaking. The plug of the display can remain plugged in.
· Insert the cable through the cable entry
· Connect the cable wires as shown in the connection diagram.
· Where appropriate, replace the retainer ring with analogue display. The grip of the retainer ring clips in with an audible click.
· Screw down the cover
Connecting the handheld terminal
· Do not replace the battery of the handheld terminal in the explosion hazardous area.
· For a Cerabar M with FM or CSA certificate: Electrical connection according to "Installation
drawing" (enclosed in the packing of the Cerabar M).
· For correct transmis sion of the communication signal, a minimum resistance of 250 W must be present between the connection points and the power supply. The Commubox FXA 191 connects the Cerabar M with a HART protocol to the RS 232 C serial interface of a personal computer. This enables the Cerabar M to be remotely operated with the Endress+Hauser operating program. The Commubox FXA 191 is used for intrinsically safe signal circuits.
· For correct transmis sion of the communication signal, a minimum resistance of 250 W must be present between the connection points and the power supply. The Commubox FXA 191 connects the Cerabar M with a HART protocol to the RS 232 C serial interface of a personal computer. This enables the Cerabar M to be remotely operated with the Endress+Hauser operating program. The Commubox FXA 191 is used for intrinsically safe signal circuits.
Langganan:
Postingan (Atom)