摘要:
A liquid level detecting apparatus resistant to the deterioration and corrosion thereof is provided while holding down an increase in the manufacturing cost thereof. This apparatus 1 has fixed electrodes 3 on which a sliding contact point 5 is slidingly moved in accordance with a fluctuation of a float, and a first resistor 4 connected to the fixed electrodes 3, the fixed electrodes 3 being made of at least silver (Ag), palladium (Pd) and a glass component, a weight ratio of the silver (Ag) to palladium (Pd) being not lower than 75 wt. % to not higher than 25 wt. %, a sliding portion 7 of the fixed electrodes 3 on which the sliding contact point 5 is slidingly moved being covered with second resistors 8 a resistance value of which is lower than that of the first resistor 4.
摘要:
The present invention provides an inexpensive small-sized liquid level detector. A liquid level detector 1 includes a float moving in accordance with variations in liquid level, a hard circuit board 5, resistors 12a and 12b provided on the circuit board 5, a first sliding path 14 made of a plurality of electrodes 13 provided on the circuit board 5 and connected to the resistors 12a and 12b, and a first contact 6 coming into contact with the first sliding path 14, and the liquid level detector 1 outputs an electrical signal based on the resistances of the resistors 12a and 12b which are varied by the first contact 6 coming into contact with at least one of the plurality of electrodes 13 forming the first sliding path 14 in accordance with a variation of the float. A second sliding path 15 electrically connected to the first sliding path 14 is provided on the circuit board 5, a second contact 7 coming into contact with the second sliding path 14 is provided, and each of the first and second contacts 6 and 7 is electrically connected to an external circuit.
摘要:
The present invention provides an inexpensive small-sized liquid level detector. A liquid level detector 1 includes a float moving in accordance with variations in liquid level, a hard circuit board 5, resistors 12a and 12b provided on the circuit board 5, a first sliding path 14 made of a plurality of electrodes 13 provided on the circuit board 5 and connected to the resistors 12a and 12b, and a first contact 6 coming into contact with the first sliding path 14, and the liquid level detector 1 outputs an electrical signal based on the resistances of the resistors 12a and 12b which are varied by the first contact 6 coming into contact with at least one of the plurality of electrodes 13 forming the first sliding path 14 in accordance with a variation of the float. A second sliding path 15 electrically connected to the first sliding path 14 is provided on the circuit board 5, a second contact 7 coming into contact with the second sliding path 14 is provided, and each of the first and second contacts 6 and 7 is electrically connected to an external circuit.
摘要:
The present invention provides a liquid surface detection device 1 in which corrosion is restrained even when liquid having conductivity is used so that a longer lifespan is achieved, including a liquid surface detection sensor 2 that outputs a signal indicating a variation in liquid level as a variation in resistance value by the sliding movement of a contact point 2a on an electrode connected to a resistor 2b, and a control unit 4 that controls supply and stops a supply of electric power to the liquid surface detection sensor 2 at predetermined intervals, in which a vehicle state determination unit that determines a state of a vehicle is provided and the control unit 4 controls the duration to stop the supply of electric power to the liquid surface detection sensor 2 when the vehicle state determination unit determines that the vehicle is in a traveling state.
摘要:
A resistance-type liquid level measuring apparatus which suppresses a detection voltage error due to silver sulfide within a permissible range in practical use and enables measurement indication with accuracy, and comprises a resistance-type sensor including a float 9 floating according to a liquid level, an insulating substrate 6 having a plurality of conductor electrodes 4 connected with a resistor 5, and a movable contact interlocked with a movement of the float 9 to come in contact with the conductor electrodes 4 on the insulating substrate 6, in which a material containing silver is used as a material of the conductor electrodes 4 or the movable contact, a voltage dividing resistance 11 is connected with a power source BA in series with the resistor 5, and a voltage of a connection point between the voltage dividing resistance 11 and the resistor 5 is outputted as a signal corresponding to the liquid level, and resistance values of the voltage dividing resistance 11 and the resistor 5 are set so that a voltage drop VS due to silver sulfide generated between the conductor electrode 4 and the movable contact becomes 15% or less, preferably 10% or less with respect to a difference between a voltage VF equivalent to a full tank of the liquid level and a voltage VE equivalent to a low region.
摘要:
A maintenance plan formulation system formulates a plan for maintaining an industrial machine used to conduct a specific operation. The maintenance plan formulation system includes first measuring means, second measuring means, and a maintenance plan formulation device. The first measuring means measures a value of information which varies by causing the industrial machine to operate for a specific job. The second measuring means measures a value of information which varies by causing the industrial machine to operate for a job other than the specific job. The maintenance plan formulation device formulates a plan for maintaining the industrial machine on the basis of the values of information measured by the first measuring means and the second measuring means.
摘要:
The present invention provides a liquid surface detection device 1 in which corrosion is restrained even when liquid having conductivity is used so that a longer lifespan is achieved, including a liquid surface detection sensor 2 that outputs a signal indicating a variation in liquid level as a variation in resistance value by the sliding movement of a contact point 2a on an electrode connected to a resistor 2b, and a control unit 4 that controls supply and stops a supply of electric power to the liquid surface detection sensor 2 at predetermined intervals, in which a vehicle state determination unit that determines a state of a vehicle is provided and the control unit 4 controls the duration to stop the supply of electric power to the liquid surface detection sensor 2 when the vehicle state determination unit determines that the vehicle is in a traveling state.
摘要:
A battery forklift truck using a permanent magnet type synchronous motor, wherein the permanent magnet type synchronous motor for load handling is installed separately from a traveling motor driving wheels. The maximum rotational speed of the motor for load handling is set lower than that of the traveling motor to eliminate the need of field weakening control in a high rotational speed range so that the efficiency of the motor in load handling can be increased.
摘要:
A digital communication system using superposed transmission of high and low speed digital signals capable of transmitting superposed high and low speed digital signals through an identical frequency band efficiently by increasing a simultaneously transmittable number of channels in the low speed digital signals, while achieving the practically reasonable bit error rate performances for both the high speed digital signals and the low speed digital signals. In this system, the low speed digital signals are transmitted in a form of spread spectrum signals and the high speed digital signals are cancelled out from the superposed transmission signals in obtaining the output low speed digital signals by using the phase inverted replica of the high speed digital signals to be combined with the superposed transmission signals, so that it becomes possible to increase a number of channels for the low speed digital signals, while achieving the practically reasonable bit error rate performances for both the high speed digital signals and the low speed digital signals.