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1. 发明专利

DE69204425D1 未知
公开(公告)号：DE69204425D1
公开(公告)日：1995-10-05
申请号：DE69204425
申请日：1992-11-19
申请人： YAMATAKE HONEYWELL CO LTD
发明人： OKANIWA HIROSHI , KOSHIMIZU ATSUSHI , MITSUTAKE ICHIRO
IPC分类号： G01F1/60 , G01F1/58
摘要： An electromagnetic flowmeter for obtaining a detection signal by sampling voltages generated from electrodes in contact with a conductive fluid flowing in a magnetic field at a predetermined timing includes an external noise detecting section, a pseudo-noise signal generating section, and a timing signal generating section. The external noise detecting section detects external noise, superposed on the fluid, from the electrodes. The pseudo-noise generating section supplies a pseudo-noise signal for a predetermined period of time if the external noise detecting section determines that no external noise signal is detected. The timing signal generating section generates a timing at which an excitation current for generating the magnetic field is generated, and the sampling timing on the basis of the pseudo-noise signal while the pseudo-noise signal is kept supplied, and causes the external noise detecting section to generate the timing at which the excitation current for generating the magnetic field is generated, and the sampling timing while no pseudo-noise signal is supplied.

2. 发明专利

DE69204425T2 未知
公开(公告)号：DE69204425T2
公开(公告)日：1996-02-29
申请号：DE69204425
申请日：1992-11-19
申请人： YAMATAKE HONEYWELL CO LTD
发明人： OKANIWA HIROSHI , KOSHIMIZU ATSUSHI , MITSUTAKE ICHIRO
IPC分类号： G01F1/60 , G01F1/58
摘要： An electromagnetic flowmeter for obtaining a detection signal by sampling voltages generated from electrodes in contact with a conductive fluid flowing in a magnetic field at a predetermined timing includes an external noise detecting section, a pseudo-noise signal generating section, and a timing signal generating section. The external noise detecting section detects external noise, superposed on the fluid, from the electrodes. The pseudo-noise generating section supplies a pseudo-noise signal for a predetermined period of time if the external noise detecting section determines that no external noise signal is detected. The timing signal generating section generates a timing at which an excitation current for generating the magnetic field is generated, and the sampling timing on the basis of the pseudo-noise signal while the pseudo-noise signal is kept supplied, and causes the external noise detecting section to generate the timing at which the excitation current for generating the magnetic field is generated, and the sampling timing while no pseudo-noise signal is supplied.

3. 发明专利

JPH0821758A EMPTY DETECTING METHOD FOR ELECTROMAGNETIC FLOWMETER 失效
公开(公告)号：JPH0821758A
公开(公告)日：1996-01-23
申请号：JP15469394
申请日：1994-07-06
申请人： YAMATAKE HONEYWELL CO LTD
发明人： MITSUTAKE ICHIRO
IPC分类号： G01F1/60 , G01F1/58
摘要： PURPOSE:To provide a method for empty detection of electromagnetic flowmeter in which accurate flow rate can be stably detected for a long period by suppressing the insulating substance generating velocity at detecting electrode. CONSTITUTION:At the time of measuring flow rate, resistors Ra, Rb are disconnected from detecting electrodes 4a, 4b by a current controller 21, and a voltage holder 22 is also disconnected. At the time of empty detection, the electrodes 4a, 4b immediately after the flow rate is measured are held by the holder 22, the resistors Ra, Rb are then connected to the electrodes 4a, 4b by the controller 21, currents are supplied from power source voltages +V, -V, and empty detection is executed by an empty detector 19 at the potential. After the empty detection is finished, the held potential immediately after the empty detection is reset to be output to the electrodes 4a, 4b.

4. 发明专利

JP2545657B2 失效
公开(公告)号：JP2545657B2
公开(公告)日：1996-10-23
申请号：JP29963291
申请日：1991-10-21
申请人： YAMATAKE HONEYWELL CO LTD
发明人： OKANIWA HIROSHI , MITSUTAKE ICHIRO , KOSHIMIZU ATSUSHI
IPC分类号： G01F1/60

5. 发明专利

JPH08254450A ELECTROMAGNETIC FLOW METER 失效
公开(公告)号：JPH08254450A
公开(公告)日：1996-10-01
申请号：JP5713795
申请日：1995-03-16
申请人： YAMATAKE HONEYWELL CO LTD
发明人： OKUDA KOJI , MITSUTAKE ICHIRO , KOSHIMIZU ATSUSHI
IPC分类号： G01F1/58 , G01D21/02 , G01K1/14
摘要： PURPOSE: To prevent a lead wire for a temperature sensor from being damaged and/or disconnected at time of the setting work of an electrode member as well as to make this temperature sensor cane into opposedly contact with a wetted wall. CONSTITUTION: An earth electrode 2 to be installed in a measuring pipe 1 is composed of a first electrode constituent member 31 being fitted in an electrode mounting hole 3 and pressed to this measuring pipe 1 by dint of a compression coil spring, and a second electrode constituent member 32 being provided with a lead wire deriving hole 39 of a temperature sensor 10 at the rear end, and screwed in the first electrode constituent member 31 so as to make this part projected to the outside of a spring bearing member 13. The temperature sensor 10 is fastened tight to a tip face of the second electrode constituent member 32, and it is inserted into the first electrode constituent member 31 while it is made to come into opposedly contact with a wetted wall 33.

6. 发明专利

JPH06243381A ALARM OUTPUT DIAGNOSTIC DEVICE 失效
公开(公告)号：JPH06243381A
公开(公告)日：1994-09-02
申请号：JP5127693
申请日：1993-02-18
申请人： YAMATAKE HONEYWELL CO LTD
发明人： MITSUTAKE ICHIRO , YOSHINO TOKUJI , MOROHOSHI MASAO
IPC分类号： G08B27/00 , G08B29/10
摘要： PURPOSE:To prevent an alarm from being delayed or stopped from being outputted owing to a fault of an alarm device by displaying the normalcy of the output of a speaker by the holding operation of the hold relay of a display circuit. CONSTITUTION:An ON/OFF signal output circuit 5 outputs a signal which turns ON at a specific level where the output of the speaker 2 is normal and turns OFF at other levels. Further, a switch 6 is alternately switched according to the signal which turns ON and OFF; when the switch is ON, the electric power from a DC power source 7 is charged in a capacitor 8 and when OFF, the electric charges of the capacitor 8 are supplied to a capacitor 9 and the hold relay 10. Thus, the capacitor 8 is charged and discharged repeatedly at certain timing to hold the operation of the hold relay 10. Consequently, a contact 11 is held ON to connect the display circuit 13 to a power source 12, thereby making a display showing that the alarm device including the speaker 2 and a speech signal output circuit 1 is in normal operation.

7. 发明专利

JPH05113358A ELECTROMAGNETIC FLOW METER 失效
公开(公告)号：JPH05113358A
公开(公告)日：1993-05-07
申请号：JP29963491
申请日：1991-10-21
申请人： YAMATAKE HONEYWELL CO LTD
发明人： KOSHIMIZU ATSUSHI , OKANIWA HIROSHI , MITSUTAKE ICHIRO
IPC分类号： G01F1/60
摘要： PURPOSE:To enable a timing signal which is in synchronization with commercial power source noise to be created. CONSTITUTION:Noises which are superposed on a fluid is detected by a noise- detection part 8 and only a commercial power source frequency component is taken out of the noises by a band-pass filter 9. Then, a pulse signal at a timing of each half period of the commercial power source frequency is output by a pulse-generation part 10 based on the noise signal and a sampling timing and excitation current timing are generated from a timing-signal generation part 12 by a signal which is in synchronization with the commercial power supply noise, thus enabling excitation coils 2a and 2b to be excited at the timing and enabling a flow rate signal to be sampled. A timing signal which is in synchronization with the commercial power source frequency is obtained highly accurately by eliminating spike noises which are superposed on the detection signal from an electrode and noises having frequencies in a band except the commercial power source frequency.

8. 发明专利

JPH10332451A ELECTROMAGNETIC FLOWMETER 失效
公开(公告)号：JPH10332451A
公开(公告)日：1998-12-18
申请号：JP13978397
申请日：1997-05-29
申请人： YAMATAKE HONEYWELL CO LTD
发明人： MITSUTAKE ICHIRO
IPC分类号： G01F1/58
摘要： PROBLEM TO BE SOLVED: To stabilize the zero point by protecting a signal lead wire from magnetic flux differential noises. SOLUTION: Signal lead wires 10A and 10B are shielded against magnetism. For that purpose, the signal lead wires 10A and 10B are covered with a pipe 21 formed of high-permeability material such as iron, nickel, and cobalt. When an excitation coils 3A and 3B are excited, its magnetic flux passes in a wall of the pipe 21 instead of the signal lead wires 10A and 10B, so, no magnetic flux differential noise generated in accordance with the switching of excitation current is picked up by the signal lead wires 10A and 10B.

9. 发明专利

JPH0814972A ELECTROMAGNETIC FLOWMETER 失效
公开(公告)号：JPH0814972A
公开(公告)日：1996-01-19
申请号：JP15371094
申请日：1994-07-05
申请人： YAMATAKE HONEYWELL CO LTD
发明人： MITSUTAKE ICHIRO
IPC分类号： G01F1/60
摘要： PURPOSE:To enable an electromagnetic flowmeter to measure the flow rate of a fluid with high accuracy even when the fluid is slurry by stabilizing the output of the flowmeter. CONSTITUTION:A sample hold circuit 11 periodically samples the inter-coil voltage of an exciting coil 2 in the 1/4 region of an exciting frequency immediately before the supply of an exciting current is interrupted. A CPU 9 fetches the sampled inter-coil voltage of the coil 2, judges whether or not a steady area is secured from the sampled inter-coil voltages, and, when, the CPU 9 judges that the steady area is secured, raises the exciting frequency fx until it is judged that the steady area is secured. When the CPU 9 judges that the steady area is not secured, the CPU 9 lowers the frequency fx until it is discriminated that the steady area is secured.

10. 发明专利

JPH0814971A ELECTROMAGNETIC FLOWMETER 失效
公开(公告)号：JPH0814971A
公开(公告)日：1996-01-19
申请号：JP15370194
申请日：1994-07-05
申请人： YAMATAKE HONEYWELL CO LTD
发明人： MITSUTAKE ICHIRO
IPC分类号： G01F1/60
摘要： PURPOSE:To accurately measure the flow rate of a fluid regardless of the temperature change of the fluid by finding a measurement error at a predetermined flow rate from storage tables respectively indicating the relations between previously measured inter-coil voltages and the temperature of the fluid and between the temperature of the fluid and measurement errors. CONSTITUTION:A first storage table indicating the relation between the inter-coil voltage of an exciting coil 2 and the temperature of a fluid to be measured and second storage table indicating the relation between the temperature of the fluid when the flow rate of the fluid is 100% and measurement errors of signal electromotive forces are prepared from measured results and stored in an EEPROM 12. An electromotive force detecting circuit 6 detects the signal electromotive force between electrodes 4a and 4b and a CPU 9 finds measured values based on the electromotive force. At the time of finding the electromotive force, the CPU 9 fetches the inter-coil voltage of the coil 2 and reads out the fluid temperature corresponding to the voltage from the first storage table in the ROM 12 and the measurement error when the flow rate is 100% at the fluid temperature from the second storage table. Then the CPU 9 finds the measured flow rate value of the fluid which is not affected by the temperature change of the fluid by calculating and eliminating the measurement error contained in the signal electromotive force based on the read-out measurement error.

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