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1. 发明专利

JPH0312554A AUTOMATIC SAMPLE BOTTLE CARRYING DEVICE 失效
公开(公告)号：JPH0312554A
公开(公告)日：1991-01-21
申请号：JP14534689
申请日：1989-06-09
申请人： HITACHI LTD , HITACHI NAKA SEIKI KK
发明人： SHIKIMA NOBUYOSHI , SAITO KOJI , OKAZAKI TSUTOMU
IPC分类号： G01N35/04 , G01N30/24
摘要： PURPOSE:To execute automatic carrying with high reliability by relaying a sample bottle from a sample bottle receiver of an automatic sample injecting device attached to each gas chromatograph to the next sample bottle receiver by an adjacent pick & place. CONSTITUTION:For instance, a No.1 sample bottle of a sample bottle store table 6 is analyzed by a gas chromatograph 1b. The table 6 rotates and carries the No.1 bottle to a position in which a pick & place 3a picks it up. Subsequently, the place 3a picks it up, rotates and stops as shown by a chain line, descends to a sample bottle receiver A of an automatic sample injecting device 2a and sets it down. Next, a bottle receiver 11a rotates and stops. Next, a pick & place 3b picks up the No.1 bottle, rotates and descends to a position of a bottle receiver Bb, opens a chuck and releases the No.1 bottle. Next, by an operation of an automatic sample injecting device 2b, the bottle receiver Bb is rotated until the No.1 bottle reaches a sample suction position, the sample is sucked, injected automatically into the chromatograph 1b, and the analysis is started. In such a way, the stored 6 sample bottle is analyzed one after another.

2. 发明专利

JPH03146860A GAS SUPPLYING DEVICE FOR GAS CHROMATOGRAPH 失效
公开(公告)号：JPH03146860A
公开(公告)日：1991-06-21
申请号：JP28474389
申请日：1989-11-02
申请人： HITACHI LTD , HITACHI NAKA SEIKI KK
发明人： KURITA SHINJI , SAITO KOJI , SHIKIMA NOBUYOSHI
IPC分类号： G01N30/32 , B01D15/08
摘要： PURPOSE:To obtain the device which generates hydrogen of a specified pressure (or flow rate) by subjecting the temp. of a container to a feedback control in such a manner that the pressure (or flow rate) of the gas generated from a hydrogen occluding alloy attains a desired value by the signal obtd. from a sensor. CONSTITUTION:The hydrogen occluding alloy 1 is housed into the container 2 and the hydrogen generated from the hydrogen occluding alloy 1 is supplied from a piping for gas outflow to other apparatus. The sensor 6 (flow rate sensor or pressure sensor) for measuring the gas outflow rate or outflow pressure is mounted in the piping 5. A hater 7 for applying heat to the hydrogen occluding alloy 1 and a temp. sensor 9 for measuring the temp. of the hydrogen occluding alloy 1 are mounted to the container 2. The signal obtd. by the sensor 6 is sent to a controller 9, by the signal of which the heater 7 is subjected to the feedback control in such a manner that the gas released from the hydrogen occluding alloy 1 attains the prescribed flow rate or pressure.

3. 发明专利

JPH11118698A SEPARATION-TYPE TURBIDITY METER 失效
公开(公告)号：JPH11118698A
公开(公告)日：1999-04-30
申请号：JP28651397
申请日：1997-10-20
申请人： HITACHI LTD
发明人： NOGUCHI HIROSHI , ISHIHARA TAMIO , SAITO KOJI , YAMADA KATSUTOSHI
IPC分类号： G06M11/00 , G01N15/06 , G01N21/49 , G01N33/18
摘要： PROBLEM TO BE SOLVED: To obtain a separation-type turbidity meter by which a turbidity value can be measured stably even when a detection part and a conversion part are installed so as to be separated by a method wherein communication means are installed at the detection part and the conversion part and a detection signal is communicated between both. SOLUTION: A laser unit 16 and a light receiving unit 17 inside a detector 13 are operated respectively when a power supply is supplied from a converter 22. A pulse signal which is detected by the light receiving unit 17 is signal- processed by a communication driver 50 so as to be transmitted, via a communication line 52, to a communication receiver 51 which is provided inside the converter 22. In addition, the converter 22 performs a prescribed computing operation to the detection signal, it finds the turbidity value of a fluid, to be measured, so as to be displayed, and it outputs an output signal 23 corresponding to a display value. In addition, the converter 22 receives the supply of a power supply 24 from the outside. In this manner, the pulse signal as the detection signal from a detection part can be transmitted at a long distance. As a result, even when the detection part and the conversion part are installed so as to be separated, the turbidity value can be measured stably.

4. 发明专利

JPH04264216A EXCITATION CIRCUIT FOR CAPACITANCE TYPE ELECTROMAGNETIC FLOWMETER 失效
公开(公告)号：JPH04264216A
公开(公告)日：1992-09-21
申请号：JP2438691
申请日：1991-02-19
申请人： HITACHI LTD
发明人： SAITO KOJI
IPC分类号： G01F1/60
摘要： PURPOSE:To facilitate the speeding up of an excitation cycle with improved stability of the measurement of a flow rate by sharpening the rising of an excitating current flowing through a coil to achieve a quick rising of a magnetic field. CONSTITUTION:With a positive or negative half cycle of an excitating current, a current to be supplied to a coil 3 becomes unlimited in control at a rising part thereof by a noncontrol system 14 at the rising part thereof and necessary amounts of the excitating current of the coil 3 and a charge current of a capacitor 5 for rectification are supplied from a exciting power source 1. After the excitation current flows, a control signal 15 enters and a constant current control is performed. In this manner, a sufficient current is supplied from the power source 1 when the charge current is necessary and the excitating current rises being delayed only by an inductance component of the coil 3 thereby improving stability of the measurement of a flow rate while enabling a higher speed of an excitation cycle.

5. 发明专利

JPH0421808B2 失效
公开(公告)号：JPH0421808B2
公开(公告)日：1992-04-14
申请号：JP8482482
申请日：1982-05-21
申请人： HITACHI LTD
发明人： SAITO KOJI , FUKUNAGA MASAO
IPC分类号： G01F1/66 , G01S15/58 , H03K5/08

6. 发明专利

JPH03146823A SIGNAL PROCESSING CIRCUIT FOR ELECTROMAGNETIC FLOW METER 失效
公开(公告)号：JPH03146823A
公开(公告)日：1991-06-21
申请号：JP28472189
申请日：1989-11-02
申请人： HITACHI LTD
发明人： SAITO KOJI
IPC分类号： G01F1/60
摘要： PURPOSE:To supply a constant current with an always stabilized rectangular wave to a coil by supplying the sum of current flowing into the coil and current flowing into a buffer circuit as an excited current. CONSTITUTION:A constant current circuit 13 is formed as a power supply circuit for a buffer circuit 6. Voltage generated by a constant current with a rectangular wave flowing into the coil 1 and impressed to both the ends of the coil 1 is converted into a constant voltage/constant current power supply by the power supply circuit in the circuit 6. Since only the fixed current out of the constant current with the rectangular wave flowing into the coil 1 flows into the circuit 6, the sum of the current flowing into the coil 1 and the current flowing into the circuit 6 is supplied as an excited current to supply the constant current of always stabilized rectangular wave to the coil 1.

7. 发明专利

JPH02181610A SIGNAL PROCESSING SYSTEM FOR ELECTROMAGNETIC FLOWMETER 失效
公开(公告)号：JPH02181610A
公开(公告)日：1990-07-16
申请号：JP34289
申请日：1989-01-06
申请人： HITACHI LTD
发明人： SAITO KOJI , SAITO TATSU
IPC分类号： G01F1/60
摘要： PURPOSE:To reduce variation in zero point resulting from the shortening of an excitation period and to cancel magnetically induced noises by varying an exciting current to a positive level, zero, a negative level, and zero in order while noticing the symmetry of the magnetically induced noises. CONSTITUTION:Noticing that the exciting current rises and falls with the same time constant and time delay, namely, that the magnetically induced noises only differ in size and have symmetrical waveforms when the exciting current rises and falls, they are added to cancel each other. The magnetically induced noises which vary the exciting current to the positive, zero, negative, and zero levels are vertically symmetrical without fail in the periods wherein they are positive and zero. At this time, the time constant of an exciting coil and the projection area of an electrode lead line determine the symmetry of the noise waveforms, but it is considered that the probability of abrupt variation in physical quantity is extremely low in shortened excitation periods and the symmetry is maintained. The magnetically induced noises, therefore, cancel each other.

8. 发明专利

JPH02181609A ELECTROMAGNETIC FLOWMETER 失效
公开(公告)号：JPH02181609A
公开(公告)日：1990-07-16
申请号：JP31889
申请日：1989-01-06
申请人： HITACHI LTD
发明人： SAITO KOJI , SAITO TATSU
IPC分类号： G01F1/60
摘要： PURPOSE:To speed up the signal processing of the electromagnetic flowmeter by providing a phase-locked loop circuit which uses a power source clock as a reference frequency and using the frequency obtained by dividing the frequency of the power source clock, multiplied by 2 , by 2 as a feedback frequency. CONSTITUTION:The power source clock and a feedback signal nearly equal to a power source clock obtained by dividing the original oscillation frequency of a voltage-controlled oscillator 4 are inputted to the reference input and feedback input of a phase difference detector 2. If there is a phase difference between the power source clock 1 and feedback signal, the phase difference detector 2 detects the phase difference and a high-frequency cutoff filter 3 converts the phase difference into a voltage. The original oscillation frequency of the voltage-controlled oscillator 4 also increases and decreases repeatedly with the phase difference and the frequency difference between the feedback signal generated by dividing the oscillation frequency and the power source clock 1 is eliminated, so the loop becomes balanced and (n+1) frequencies which are 2 times as high as the power source clock are generated independently by a frequency divider 5.

9. 发明专利

JPS62132118A SIGNAL PROCESING CIRCUIT OF ELECTROMAGNETIC FLOWMETER 失效
公开(公告)号：JPS62132118A
公开(公告)日：1987-06-15
申请号：JP27151485
申请日：1985-12-04
申请人： HITACHI LTD
发明人： SAITO KOJI
IPC分类号： G01F1/60
摘要： PURPOSE:To make it possible to widely take the dynamic range of a signal itself by cutting the upper and lower pats of a power source induced noise in a definite ratio, by mounting upper and lower limit amplifiers obtaining predetermined upper and lower limit values with respect to the output of an AC differential amplifier for amplifying the signal proportional to the flow speed from a detector and a limiter circuit etc. CONSTITUTION:An exciting current is supplied to a detector 1 from an exciting circuit 3 by a control circuit 2 to generate a flow amount signal between the electrodes of said detector 1 and said signal is amplified by an AC differential amplifier 4. A reversal amplifier 5 reverses negative signal polarity to positive one and a positive signal is always supplied to a V/F converter 7 by the operation of an electronic switch 6 by the control circuit 2. Subsequently, with respect to the output Es of the amplifier 4, an upper limit amplifier 12 obtains an upper limit value of Es(1+alpha) and a lower limit amplifier 13 obtains an lower limit value of Es(1-alpha). Three these outputs enter a limiter circuit 14 and the output Es is limited to the region of the output Es(1+ or -alpha). That is, spike like noise is limited to the range of the output Es(1+ or -alpha).

10. 发明专利

JPS5833656B2 失效
公开(公告)号：JPS5833656B2
公开(公告)日：1983-07-21
申请号：JP1247878
申请日：1978-02-08
申请人： HITACHI LTD
发明人： SAITO KOJI , FURUYA HISAHIRO , KAKIUCHI HIDEYUKI
IPC分类号： H01J37/22 , H01J37/28

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