Panametrics DigitalFlow GC868, Руководство по программированию, Страница: 22 / 134

Chapter 1. Programming Site Data
1-11 DigitalFlow™ GC868 Programming Manual (2-Channel)
f. Use the numeric keys to enter the
Wedge Angle
(the angle of the ultrasonic
transmission) provided by the factory in degrees and press [ENT] .
• If you selected OTHER in step d, use the numeric keys to enter the
Wedge
Soundspeed in ft/sec or m/sec provided by the factory and press [ENT] . The
meter proceeds to step 5.
1.6.3.2 Wedge
Temperature
4. Use the numeric keys to enter the
Wedge Temperature
in deg F provided by the
factory and press [ENT] .
1.6.3.3 Pipe Material 5. Press [F1]-[F4] to select the
Pipe Material
. Press [
→
] to access additional
options, as listed in Table 1-3 below.
• Depending on the pipe material choice, another prompt may ask you to select
the
Specific Material
.
• If you have selected OTHER , enter the pipe material Sound Speed. Press [ENT].
1.6.3.4 Pipe OD 6. Enter the known
Pipe OD
or circumference and use the [F1]-[F4] keys to select
the appropriate units. Press [ENT]. (The meter will only accept values from
1/8 to 648 in.)
The required pipe data may be obtained by measuring either the pipe outside
diameter (OD) or circumference at the transducer installation site. Alternatively, the
information may be obtained from tabulated data for standard pipe sizes.
1.6.3.5 Pipe Wall 7. Enter the known thickness of the
Pipe Wall
, in the same units used for the pipe
OD. Press [ENT] . (The meter will only accept values from 0 to 4 in.)
If the pipe wall thickness is not known and cannot be conveniently measured, look
up the value in a table of standard pipe size data or use the Model GC868’s on-line
Help Menu .
1.6.3.6 Fluid Type 8. Press [F1] = natural gas, [F2] = air, [F3] = steam, or [F4] = any other gas to
select the
Fluid Type.
• If OTHER was selected, enter the speed of sound (in feet per second) in the gas
to be measured. Press [ENT] . (The meter will only accept values from
125 to 9,000 ft/sec.)
1.6.3.7 Reynolds
Correction
9. The
Reynolds Correction
factor is a number based on the kinematic viscosity
and flow rate of the gas. At the prompt, press [F1] to turn Reynolds Correction
off, or [F2] to turn it on.
• If you select Reynolds Correction, the GC868 asks for the Kinematic Viscosity of
the gas (available in the brochure Sound Speeds and Pipe Size Data , 914-004).
Use the numeric keys to enter the correct value and press [ENT] .
1.6.3.8 Calibration Factor 10. Enter a value for the flow
Calibration Factor
and press [ENT] . The default value is
1.00. (The meter will only accept values from 0.5000 to 2.0000.)
Table 1-3: Pipe Materials
Pipe Material Category Specific Material
Steel Carbon Steel or Stainless Steel
Iron Ductile Iron or Cast Iron
Cu - Copper None
Al - Aluminum None
Brass None
CuNi - Copper/Nickel 70% Cu 30% Ni or 90% Cu 10% Ni
Glass Pyrex, Flint, or Crown
Plastic Nylon, Polyester, Polypropylene, PVC
(CPVC), Acrylic
Other* Any material