KRAL BEM 300 Series, Operating Instructions Manual

Page: 43 / 48

Operating Instructions OIE 15en Edition 2019-12 HW 2.0/SW 2.0 43
Glossary
Appendix
Appendix
Glossary
Term Meaning
Adjusting time
□
Time span after whose expiry the output is identical with the input
Analog input
□
Converts an electrical value (0–10 V, 4–20 mA) into a digital value
Analog output
□
Represents an internal digital value as an electrical value
(0–10 V, 4–20 mA)
□
Is updated with the cycle time
Averaging
□
Low-pass filter function for suppressing abrupt changes
Baud rate
□
Rate of data transfer per time unit (bit/s)
Bus connection
□
Digital communication with connected users
Bus interface
□
Makes available the hardware (e.g. RS 232) and software
(e.g. Modbus RTU protocol) required for digital communication
Circulation ratio
□
Ratio of feed rate/consumption (A/(A-B))
Collective error message
□
Message that indicates the occurrence of at least one error
Consumption
□
Consumption Q=QA-QB
Cycle time
□
Time section in which all the calculations are carried out, inputs
processed and outputs operated
Density
□
Ratio of mass-to-volume (e.g. kg/m
3
)
Density table
□
Describes the relationship of density-to-temperature
□
Thus maps the volume coefficient of expansion
Differential measurement
□
The values of two volumeters are measured and subtracted
Electronic unit
□
BEM 300/500 indication device
Flow direction detection
□
Detection of the flow direction through two sensors with square
wave signals out of phase by 90°
Flow rate
□
Amount flowing per time unit (e.g. l/s)
Galvanic isolation
□
Isolation of differing voltage potentials
Incremental encoding
input
□
Processes two square wave signals out of phase by 90°
□
Provides a counting function under consideration of the flow
direction and a frequency measuring function
K-factor
□
Number of pulses per flow volume unit
□
Characteristic of a volumeter
Limit frequency
□
Minimum or maximum frequency that can be used
Limit value
□
Set value at which an action is carried out (e.g. switching of a relay)
when it is reached or exceeded
Linearity
□
Dependence of the K-factor across the flow range
Linearization
□
Maps the dependence of the K-factor of a volumeter across the flow
range in an electronic unit
Link channel AB
□
Q=QA-QB or Q=QA+QB
Mass calculation
□
Volumetric values are converted into mass values under
consideration of the temperature via the density table
Pick up 1
□
Sensor that generates one pulse per defined flow rate
Pick up 2
□
Sensor that generates one pulse with square wave signals out of
phase by 90° per defined flow rate
□
Allows the flow direction detection