Siemens SITRANS FUH1010PVDX, Руководство по эксплуатации, Страница: 116 / 308

5-14
CQO:1010PVXFM-3 Section 5
5.3.1 HOW TO SELECT A LIQUID CLASS
The liquids listed in the Liquid Class option list are representative samples of the class of liquids to which
they belong. Selecting a named liquid fills in the [Estimated Vs m/s], [Viscosity cS], and [Density SG]
parameters automatically. However, you have the option of editing these parameters individually to fine
tune the liquid settings. If you do not find a liquid that matches your application, then you can select
[Other]. This selection will not provide a liquid name or automatic parameter entry.
To select a Liquid Class:
To access the option list press
Scroll through the list to find the closest match to the application’s liquid.
To register selection press
ENT
Liquid Class
Siemens 2 Channel [1] FLOW1
Access Liquid Option List
Estimated Vs m/s 1482
Viscosity cS 1.00
Density SG 1.000
Select Liquid Water 20C/68F
Use this menu cell to edit the
Estimated Vs ONLY if you are
sure of a more accurate value.
This will reduce the chances of
a re-spacing request for clamp-
on flow transducers during the
install procedure.
Use this menu cell to edit
the liquid viscosity ONLY
if you are certain that the
data you enter is
accurate. An erroneous
entry could affect meter
calibration.
Use this menu cell to
edit the specific
gravity of the liquid.
How to Edit the Estimated Vs (liquid sonic velocity)
During transducer installation, the flow computer bases its initial transducer spacing recommendation
on the value stored in this menu cell. Estimated Vs m/s allows you to review and modify (if necessary)
the Vs value for the liquid class you selected.
After you install the transducers, the computer will measure Vs directly. If the displayed (or edited) Vs
stored in this menu cell is accurate, the transducers will be spaced correctly. This will eliminate the need
to re-space the transducers after their initial installation. However, if the estimated Vs is substantially dif-
ferent from the measured value, the computer will request you to re-space the transducers during the
transducer install procedure.
NOTE: During the Xdcr install procedure (see paragraph 6.4), you can ignore a respacing re-
quest by pressing the <Down Arrow> instead of <ENT>. If this triggers a Spacing Alarm,
check [Diagnostic Data/Site Setup Data] to make sure the measured Vs value does not
exceed the Vs max or Vs min items.