16 Appendix
16.1 Glossary
Designation
Meaning
Adjusting time
o
Time span after whose expiry the output is identical with the input
Single-line measurement
o
The values of a flowmeter are measured and evaluated
Electronic unit
o
Display and processing unit BEM 300/BEM 500
o
Display and processing unit BEM 100/BEM 150
Galvanic isolation
o
Isolation of differing voltage potentials
Averaging
o
Low-pass filter function for suppressing abrupt changes
Limit frequency
o
Minimum or maximum frequency that can be used
Pulse (signal)
o
A rising edge is followed after a certain period by a falling edge
o
As a rule corresponds to a square wave signal
Pulse output
o
Generates pulses with 24 V signal level conforming to the scale of an input variable
Pulse input
o
Processes pulse signals
Pick up 1
o
Sensor that generates one pulse per defined flow rate
Pick up 2
o
Sensor that generates one pulse with +90° phase shift per defined flow rate
o
Allows a flow direction recognition in combination with Pick up 1
Incremental encoding
input
o
Processes two square wave signals out-of-phase by 90°
o
Provides a counting function under consideration of the flow direction and a frequency measuring
function
K-factor
o
Number of pulses per flow volume unit
o
Characteristic of a flowmeter
Linearization
o
Maps the dependence of the K-factor of a flowmeter across the flow range in an electronic unit
Linearity
o
Dependence of the K-factor across the flow range
Mass calculation
o
Volumetric values are converted into mass values under consideration of the temperature by
means of the density table.
Modbus connection
o
Digital communication with connected users
Modbus interface
o
Makes available the hardware (e.g. RS 232) and software (e.g. Modbus RTU protocol) required for
digital communication
Rate
o
Volume per time unit
Reaction time
o
Time for a change of 99.9 % of the actual jump
Square wave signal
o
Pulse signal with square wave form
Relay output
o
Potential-free change-over contact
Group fault message
o
Message that indicates the occurrence of at least one fault
Serial interface
o
Sends or receives data in chronological sequence
Scale
o
Assigning of a maximum input value to a maximum output value
Temperature input
o
Processes signals of a temperature sensor
Temperature sensor
o
Converts the physical value temperature into an electrical value (e.g. resistance)
Temperature
compensation
o
Consideration of the current temperature at the volume calculation and mass calculation in order to
compensate density changes
Total
o
Volume values that have been measured since the last reset
Consumption
o
Consumption Q=QA-QB
Volume measurement
o
The volume that passes the flowmeter is calculated from the K-factor [P/l] and the pulses of the
flowmeter
Volumeter
o
Flowmeter
Reset
o
Setting the variable to the value 0
Cycle time
o
Time section in which all the calculations are carried out, inputs processed and outputs operated
Operating instructions
OIE 15en-GB Edition 2020-03
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