Dresser Model 10C25 Series K Installation, Operation, and Maintenance Manual
© 2018 Natural Gas Solutions North America, LLC
Page 57 of 74
Data Field
Setting
Notes
Test Control Mode
Select
Optical Scanner
.
Meter Output
Select
Temperature Correction
.
Pulses/Test (PPT)
Select
Other
.
In the small box to the right, select pulses per test
based on Table 15.
Test Volume cf
Select
Other
.
In the small box on the right, enter the same
number as the value input in the Pulses/Test (PPT)
field.
This data needs to be the same
because one (1) pulse = 1 cf.
TC Options (❷)
TC Options
DIAPHRAGM TC (CONTINUOUSLY COMPENSATED)
Flow rate and test points (
❸
)
Flow Rate
Enter the desired flow rate for the first test.
Note:
Volume, Drive Rate/PPT, and other fields automatically populate based on the
information provided in the Prover software configuration settings group (1).
14
Differential Testing
Only a change in the internal resistance of a meter can affect its accuracy. Any increase in the resistance
to flow increases the pressure drop between the inlet and the outlet of the meter, which increases the
differential pressure drop. This is why the meter differential pressure drop appears as a prime indicator of
meter condition.
Although accuracy is not directly determined by a differential test, testing has shown that an increase of
up to 50% in the differential pressure at the higher flow rates (25% and above) can be tolerated without
affecting meter accuracy by more than 1%. Supportive technical data is available upon request.
Figure 75: Differential pressure taps located on the inlet and outlet connectors
Differential pressure
taps
