These values must be downloaded to the appropriate meter data points (AvgDlyA...
AvgDlyD, DltDlyA... DltDlyD).
2. Update the chord lengths “L” of the transducers. The lengths of transducer
assembly and individual components, including housing, spacer and stalk, are
included on the calibration sheet and are etched on the transducer housings,
spacers and stalks. The length of the meter body is found on the original calibration
sheet supplied with the meter. The value “L” is determined by subtracting the
lengths of the transducer stalks, spacers and housings from the length of the meter
body. This value should be written to the appropriate meter data points for each
chord that received new transducer housings and/or transducer stalks (LA... LD).
3. Chord length “L” Calculation. The chord length “L” is calculated from the meter
length as well as the lengths of transducer stalks, spacers and housings as shown in
the following equation.
Equation 3-2: Chord "L" Dimension for T-200 transducer assemblies
L
cℎord
= L
MeterHousing
− L
Stalk1
− L
Spacer1
− L
Housing1
− L
Stalk2
− L
Spacer2
− L
Housing2
where
L
chord
= chord “L” dimension (in) (LA…LD)
L
MeterHousing
= meter housing length (in)
L
Stalk1
= transducer 1 stalk length (in)
L
Stalk2
= transducer 2 stalk length (in)
L
Spacer1
= transducer 1spacer length (in)
L
Spacer2
= transducer 2 spacer length (in)
L
Housing1
= transducer 1 housing length (in)
L
Housing2
= transducer 2 housing length (in)
3.6 T-200 transducer capsule assembly removal
and installation
The T-200 transducer capsule assembly can be removed or installed while the line is
pressurized or at atmospheric pressure.
Figure 3-14: T-200 transducer capsule assembly
Meter repairs Maintenance and Troubleshooting manual
June 2019 P/N 3-9000-769
74 Gas Ultrasonic Flow Meters
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