The present disclosure relates to a test device to be inserted into the syringe receptacle of a pump, for example for a blood treatment apparatus, for testing at least one function of the pump and/or of the blood treatment apparatus. The test device includes a holding device for releasably holding the test device on the housing of the blood treatment apparatus. In addition, the test device includes at least one movable actuator and at least one electric motor arranged to directly or indirectly move said movable actuator or a section thereof.

The present disclosure relates to a test device to be inserted into the syringe receptacle of a pump, for example for a blood treatment apparatus, for testing at least one function of the pump and/or of the blood treatment apparatus. The test device includes a holding device for releasably holding the test device on the housing of the blood treatment apparatus. In addition, the test device includes at least one movable actuator and at least one electric motor arranged to directly or indirectly move said movable actuator or a section thereof.

In order to avoid over-lubrication of the cylinders (2) in a piston compressor (1) and to reduce the amount of lubricant to a level required for operation, according to the invention, a lubricating system having a lubricating system control unit (14) is provided, in which system at least one lubricant sensor (15) is provided for detecting a lubricating film measurement variable (S) representative of a lubricating film thickness of a lubricating film (11) on the cylinder surface of the cylinder (2), the lubricating system control unit (14) being designed to operate the lubricating system at least once in a predetermined calibration operating mode during operation of the piston compressor (1) and to determine a lubricating film state value (SZ) on the basis of the lubricating film measurement variable (S) detected during execution of the calibrating operating mode and the lubricating system control unit (14) being designed, after the end of the calibration operating mode during operation of the piston compressor (1), to control the amount of lubricant to be introduced depending on the determined lubricating film state value (SZ).

A controller for a well system automatically profiles the system, detects a pre-charge of an associated pressurized storage tank, and automatically configures pressure-based control of a pump based on the detected pre-charge. The controller determines the pre-charge of the pressurized storage tank while the tank is connected to the system. While monitoring a system pressure, the controller activates the pump to initiate a filling operation of the pressurized storage tank. The controller analyzes a change in system pressure during the filling operation to determine the pre-charge of the pressurized storage tank. With the pre-charge determined, the controller automatically configures pressure settings for pressure-based control of the pump.

A controller for a well system automatically profiles the system, detects a pre-charge of an associated pressurized storage tank, and automatically configures pressure-based control of a pump based on the detected pre-charge. The controller determines the pre-charge of the pressurized storage tank while the tank is connected to the system. While monitoring a system pressure, the controller activates the pump to initiate a filling operation of the pressurized storage tank. The controller analyzes a change in system pressure during the filling operation to determine the pre-charge of the pressurized storage tank. With the pre-charge determined, the controller automatically configures pressure settings for pressure-based control of the pump.

A fixture has a body that connects to a motor, the body having a bore. The body has a piston in the bore, separating the bore into a pressure chamber and a lubricant chamber in fluid communication with lubricant in the motor. A technician applies pressure to the pressure chamber, which causes the piston to increase pressure of the lubricant in the lubricant chamber and in the motor. The technician monitors a distance of movement of the piston, indicating a presence of residual air in the lubricant. If the movement meets a amount, the technician applies a vacuum to the lubricant chamber and bleeds out residual air from the lubricant in the motor.

Spring-based sensor devices are described. For example, a spring-based sensor system may include at least one spring associated with a mechanical element, the at least one spring operative to change from a first state to a second state based on a configuration of the mechanical element, sensing circuitry configured to determine an electrical property of the at least one spring, the electrical property to have a first value when the at least one spring is in the first state and a second value when the at least one spring is in the second state, and a logic device to determine a status of the mechanical element based on the electrical property. Other embodiments are described.

Spring-based sensor devices are described. For example, a spring-based sensor system may include at least one spring associated with a mechanical element, the at least one spring operative to change from a first state to a second state based on a configuration of the mechanical element, sensing circuitry configured to determine an electrical property of the at least one spring, the electrical property to have a first value when the at least one spring is in the first state and a second value when the at least one spring is in the second state, and a logic device to determine a status of the mechanical element based on the electrical property. Other embodiments are described.

A method of probabilistically estimating a velocity of a plunger of a beam pump may comprise continuously monitoring well acoustics using a plurality of passive acoustic sensors attached to external structures of the beam pump; digitizing outputs of the plurality of passive acoustic sensors and sending the digitized outputs to a computing device for storage and processing; and using the digitized outputs of the plurality of passive acoustic sensors, estimating a probability of the velocity of the plunger using a hidden Markov model (HMM) to represent a probability of a position and the probability of the velocity of the plunger, the HMM comprising a state space model and an observational model.

A method of probabilistically estimating a velocity of a plunger of a beam pump may comprise continuously monitoring well acoustics using a plurality of passive acoustic sensors attached to external structures of the beam pump; digitizing outputs of the plurality of passive acoustic sensors and sending the digitized outputs to a computing device for storage and processing; and using the digitized outputs of the plurality of passive acoustic sensors, estimating a probability of the velocity of the plunger using a hidden Markov model (HMM) to represent a probability of a position and the probability of the velocity of the plunger, the HMM comprising a state space model and an observational model.