
IM-P505-02-US
Issue 1
51
UTM20 Series Ultrasonic Transit-time Flowmeters
10.7 Setup > Meter > Flow Setup
An asterisk (*) indicates the parameter default
Flow Setup Submenus
Options/Descriptions
DIRECTION
*FORWARD REVERSE
BIDIRECTIONAL
*ENABLED DISABLED
LOW FLOW CUTOFF
Numeric entry Units and decimals are based on FLOW RATE UNITS Zero and
positive values *0 0
SIGNAL CUTOFF
*30%
SIGNAL HIGH
*90%
MINIMUM FLOW
-10000 (default); min -2,000,000 Number of decimals points depends on Home
Screen settings
MAXIMUM FLOW
10000 (default); max 2,000,000
10.8 Setup > Meter > Advanced
An asterisk (*) indicates the parameter default
HEAT CALCULATION
(Energy meter only)
Dynasonics Calculation EN1434 TYPE
Rate of Heat Delivery = Q × (Tin - Tout) × C × ρ
Where:
Q = Volumetric flow rate
Tin = Temperature at the inlet
Tout = Temperature at the outlet
C = Heat capacity
ρ =
Density of fluid
DAMPING
*40 seconds
For detailed information on these parameters, see the
paragraphs following this table
SENSITIVITY
*60%
HYSTERESIS
*5%
BAD DATA REJECTION
*3
FILTER METHOD
*Adaptive
WAVE
• *AUTO automatically selects waveform based on flow speed and signal quality
• SIN CARROT TOP is best for low speed flow
• BEST BARKER is best for high speed flow
TEMP COMPENSATION
*MANUAL
TEMP #1
TEMP #2
Selection is only available for Energy
meter For the Flow meter, manual
temperature compensation is always on
Temperature compensation adjusts the
viscosity of the fluid used in Reynolds
number compensation and the fluid
speed of sound
MANUAL REF TEMP
Numeric entry
-40 to 350 °F (-40 to 176 °C)
REF TEMP UNITS
°F
°C
K
Select the units for the manual reference temperature
REYNOLDS
*ENABLED
DISABLED
Flow rate compensation based on fluid Reynolds number as
the fluid changes from laminar to transitional to turbulent flow