IM-P505-02-US Issue 1
55
UTM20 Series Ultrasonic Transit-time Flowmeters
10.9 Setup > Meter > Calibration
An asterisk (*) indicates the parameter default
Calibration Submenus Options/Descriptions
FACTOR MODE
FACTORY
*FIELD
Select FIELD to set the zero and use the sensor and
scale factors of the transducers
FACTORY SETTINGS
ZERO
The zero offset entered during factory calibration ZERO
is for reference only and most likely the ZERO VALUE for
your installation will be different from the factory ZERO
Numeric display; *0 000 ns
CAL FACTOR
One of two calibration factors unique to each transducer
pair if the transmitter was used during factory calibration
Numeric display # ###
SENSOR FACTOR
One of two calibration factors unique to each transducer
pair if the transmitter was used during factory calibration
Numeric display # ###
ZERO MODE
MANUAL
*NO FLOW
STEADY FLOW
Due to different pipe characteristics, the meter must be
zeroed in order to maintain accuracy The recommended
method is to stop flow and make sure there is no flow
before zeroing the meter In situations in which that is not
feasible, you may zero the meter while the flow is steady
or enter the zero manually
Select the method to zero the meter
SET ZERO - NO FLOW
SET ZERO AT NO
FLOW in process
and confirmation
screen
Check that the pipe is full of liquid and not flowing Flow
must be absolutely zero Securely close any valves and
allow time for settling to occur
SET ZERO - FLOW
SET ZERO AT
FLOW in process
and confirmation
screen
Stabilize the flow to a steady level before zeroing the
meter In situations where it is not possible to stop flow,
use this method to zero the meter
When selected, the meter will calculate the zero typically
in 5 to 10 seconds and will
indicate if the meter was successful or not in determining
the flow
MANUAL ZERO
Numeric entry ##
### ns
Allows for manual entry of the zero value when ZERO
MODE is MANUAL
ZERO VALUE
Numeric display ##
### ns
The zero offset used to calculate the flow rate If the
meter is not zeroed after installation, this value will match
the factory ZERO setting
SENSOR FACTOR
Numeric entry ##
### ns
The value used in calculating the zero value when
zeroing the meter at steady flow This value can be found
on the transducer label
SCALE FACTOR Numeric entry
The factor used for linearizing the flow rate calculation
when FIELD is selected for FACTOR MODE Enter the
CAL FACTOR from the transducer
10.9.1 Factory Calibrated Procedure
Each transducer pair has a CAL FACTOR and SENSOR FACTOR on the label Verify FACTOR
MODE is set to FIELD and enter the factors from the transducer into the CAL FACTOR and SENSOR
FACTOR settings
Zero the meter after entering the CAL FACTOR and SENSOR FACTOR
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