Glossary of Terms
Angular OrientationThis references the orientation of the piston in a rotary system, relative to the motor face, with the piston and cylinder of the Pump Module mounted on the Motor/Base Module. The angular orientation sets the reciprocal stroke travel of the piston. |
Bubble ClearAutomatic cycle in a linear system providing a means of removing small bubbles of air or gas from the pump chamber. Selected from the control panel. |
CalibratedThe sudden formation and collapse of bubbles in liquids by means of mechanical forces creating low pressure. |
CavitationAutomatic cycle in a linear system providing a means of removing small bubbles of air or gas from the pump chamber. Selected from the control panel. |
ChannelIVEK offers both single and multiple channel configurations. A channel refers to a single Motor/Base or Actuator Module driven by a Controller Module. Single Channel systems are often bench-top units. Multiple Channel systems are often integrated into a production application to fill many vessels at once. |
Clean LiquidsApplication liquids or reagents which have been prepared via a filtration, distillation or other sterilization process to a controlled level of acceptable molecular and(or) biological contamination. |
Clear Faults1. The 'clear faults' command must be issued prior to any commands which would cause motion in a Actuator Module or motion control device in a system which is faulted. This command responds with the identity of the fault being cleared and additional information for certain faults.
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Command StringA series of characters sent to a controller containing a serial interface to control its operation. |
Compatible LiquidsAny liquid that has been evaluated and qualified as having no negative effect on the liquid management system components. |
Continuous MeterOperating mode to produce a continuous liquid flow as long as a control signal (and liquid) is supplied. Note: This mode only applies to the Digifeeder 2002 system and utilizes two pumps driven by linear actuators that alternate in operation between intake and discharge cycles. All other systems use Meter mode. |
Controller ModuleThe module in a system containing the electronics for controlling and monitoring system operations. |
CylinderPump Module component where the piston is housed. |
Dead VolumeLiquid occupying areas within the system which is not replaced during each cycle or removed during a purge. |
Deflection1. The deviation from zero or other neutral value by the indicator of a measurement instrument.
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DegassingGenerally, referring to the evacuation of free gasses from the application liquid. |
Direction1. Controller mode function used to select forward or reverse motion of liquid flow through the Pump Module and liquid circuit.
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Dispense ModeController mode function used to deliver a discrete, specific volume of liquid at a specific flow rate as the result of a triggering action. |
Drive System1. The system configuration relative to the controller and Motor/Base Module including electronics, software, drive motor and braketry options.
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Empty ModeController mode function used to return liquid in the inlet tubing, pump chamber, and outlet tubing to the supply reservoir, when metering and(or) dispensing operations are completed. |
FaultA condition where the system controller has detected an improper condition or state of the equipment. The existence of the fault will be indicated on the system controller until the fault is cleared by a specific action. |
Fault DelimiterPertains to a system with a serial interface. A character, in the response command, which identifies the subsequent value as a fault identifier and which separates it from preceding values. |
Flow Volume1. Rotary System: The flow magnitude, (and direction), relative to the pump size and due to the angular deflection of the Pump Module cylinder with respect to the "zero" point on the calibration scale of the specific Pump Module.
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Fluid ShearThe separation of the dispensed liquid from the liquid remaining in the dispense tip. Optimizing several factors, such as the dispense tip geometry and dispense rate, improves fluid shear and the repeatability of the dispense volume. |
Fluid Slip LossRefers to the liquid which passes through the clearance space, (~.00005") between the piston and the cylinder wall. The clearance between the piston and cylinder wall must be optimized for the liquid being pumped in order to minimize the loss due to fluid slip. |
GlandProvides for washing the rear portion of the piston by a liquid passing at a rate of ~2 to 5 ml/min through a groove in the cylinder wall. The gland prevents the liquid being dispensed from accumulating at the rear of the piston, thereby greatly reducing the possibility of a seized pump. |
Hall EffectIn a current-carrying semiconductor bar located in a magnetic field that is perpendicular to the direction of the current, the production of a voltage perpendicular to both the current and the magnetic field. This physical effect is used in position sensors. |
Hardness1. The relative resistance of a mineral to scratching, as measured by the Mohs' scale.
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Hardwired SignalsElectrical signals between two control devices connected with dedicated conductors. |
Interface1. A point or device at which a transition between media, power levels or modes of operation is made.
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Lateral Flow Assays (LFAs)LFAs are used in point-of-care diagnostics and in rapid testing and involve the detection of target analytes in a sample using a reagent and a strip-based format. Reagent dispensing is a critical step in lateral flow assays (LFAs). |
LED IndicatorsLight Emitting Diodes. Utilized as system condition or mode indicators and warnings. |
Linear MovementMovement along a straight line. |
Linear RateRate of the linear component of a movement. |
Linear Series Actuator ModuleThe assembly in a linear system that drives the piston in the attached Pump Module. The linear actuator produces separate rotational movement for valving and linear movement for liquid displacement. The linear actuator in a linear system corresponds to the motor/base assembly in a rotary system. |
Linear Series SystemOne of two major types of precision liquid dispensing or metering systems available from IVEK Corporation. The controller of the linear system can separately command the linear (displacement) and rotary (valving) motions of the piston. The liquid displacement is constant over time, limited by acceleration and deceleration at the beginning and end of the motion. The Digispense® 3020 and Multispense® 2000 are linear systems. |
Load ModeLinear controller mode used to load the pump cylinder when empty or when the volume is less than the next volume of liquid required to dispense or meter. The automatic load function can be set to Manual, Empty, or Every. |
Mechanical ValvingValve ports are opened and closed via mechanical actuation. This is in contrast to check valves which open and close as a result of fluid pressure/flow. |
Meter ModeController mode function used for continuous pumping of liquid. METER is very similar to PRIME. The difference between the two is PRIME gets the system setup for dispensing or metering of liquid and METER is used for constant flow, liquid metering. |
MicrometerRotary Pumps, (B, C and D sizes); An optional micrometer scale assembly mounted to the Motor/Base Module. Used for position finding or fine adjustment and not for gross pump head movement. |
Motor/Base ModuleThe module in a rotary system that drives the piston in the attached Pump Module. The Motor/Base Module produces a combined rotary and linear movement that synchronizes the liquid displacement and valving functions. The module consists of a motor, spindle, spindle sensor, base frame and adjusting mount for the Pump Module. |
Multiplex SystemThe Multiplex system uses a single motor and two lead-screws to drive multiple three-piece pump modules. The motor and lead-screw combination drive the pistons in a linear motion to create displacement. Each Pump Module has an air driven rotary actuator to turn the valve towards the intake or discharge port. |
NoiseAny unwanted disturbance within a dynamic electrical or mechanical system. This can include electrical, electromagnetic, or acoustical energy. |
Operating Parameters1. All specified values utilized during system operation in order to achieve the desired performance of the system.
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Optically Isolated SignalSignals that are coupled using a device that connects signals from one electronic circuit to another by means of light. More correctly, the signals are electrically isolated and optically coupled between the two circuits. |
PistonPump Module component. Part of the piston/cylinder set. |
PneumaticActuated or operated by compressed air or other gas. |
PortsOpenings in the Pump Module cylinder and housing allowing the flow of liquid through the Pump Module assembly during operation. Used for filling the pump liquid circuit, (inlet tubing, pump chamber, outlet tubing), at initial start-up. Also for eliminating air bubbles in the circuit. |
Prime RateMotor speed during a prime operation. In a linear system, the prime rate and the load rate use the same setting. In a rotary system, the prime rate may be the same as the dispensing rate, or a separate setting may be used. |
PulsationsCyclical fluctuations of liquid flow. |
Pulse Damper or Pulse SuppressorMechanical device inserted into the outlet tubing of the liquid circuit to dampen liquid pulsations. |
Pump ModuleLiquid management system assembly consisting of the precision ceramic piston/cylinder set, protective housing, mounting hardware and fittings. |
Pump SeizedAn event whereby the ceramic piston and cylinder set become locked or "frozen" together. |
Reference CycleIn a linear system, an operational cycle during which the controller determines the absolute linear and rotary position of the linear actuator. After the power is turned on, or after a fault, a reference cycle must be completed before any other operation of the linear actuator can take place. |
Rotary MovementThe motion, (rotation) of a part or device around an axis. |
Rotary Series SystemOne of two major types of precision liquid dispensing or metering systems available from IVEK Corporation. The rotary system has a single mechanical coupling which translates the rotation of the motor into the combined linear (displacement) and rotary (valving) motions of the piston. The angular adjustment of the Pump Module determines the piston displacement for each dispense cycle. The controller does not have separate control of the linear and rotary motions of the piston. Liquid displacement is sinusoidal and corresponds to one rotation of the motor shaft (half is zero flow and half is 50% of sinusoid). The Digispense 3009 is a rotary system. |
Rotary ValveA device in which the rotation of a part performs the valving function. |
Sanitary PumpPump Module option designed to conform to the cleansing standards of the US Food and Drug Administration. |
Self PrimingA pump which requires no pre-wetting or pressurization procedure before being able to initiate liquid flow. |
Specific GravityThe ratio of the density of a fluid to the density of water. The specific gravity of a fluid must be considered when making gravimetric measurements (weighing) of the output of a volumetric pump. |
SpindleComponent in the Motor/Base Module of a rotary system, which couples the motor shaft to the piston. The spindle contains a spherical bearing which accepts the piston drive pin. |
Stepper MotorA digital device that converts electrical pulses into proportionate mechanical movement. Each revolution of the motor shaft is made in a series of discrete identical steps. The design of the motor usually provides for clockwise and(or) counterclockwise rotation. |
TorqueA force that tends to produce rotation or twisting. |
Torque Limited DriveMotor function that will preclude piston breakage by causing the motor to stall in the event of a pump seizure. |
TotalizerController option displaying total motor turns or dispense triggers. |
ValvingSelectively opening the liquid path between the pumping chamber and one of the liquid ports. |
Valving OperationRotating the piston in a linear system to change the port communicating with the pumping chamber without displacing liquid. |
Valving SpeedThe rotational speed during valving in a linear system. |
Variable DisplacementCapability of changing the volume of liquid moved by the piston for each stroke through either electrical or mechanical means. |
ViscosityThe measure of a fluid's tendency to resist a shearing force. The viscosity of a fluid affects the degree to which it resists flow under an applied force. Viscosity can remain constant, increase, or decrease as shear rate (flow rate) increases. Absolute viscosity is generally measured in centipoise. Kinematic viscosity includes the influence of the specific gravity of the fluid and is generally measured in centistokes. Kinematic Viscosity X Specific Gravity = Absolute Viscosity |
Wet OperationsRefers to the operation of the liquid management system. It is preferable to avoid running the pump dry. For extended periods, most application liquids will provide the necessary lubrication and cooling to prevent chirping, binding or seizure. |