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71
Reference Manual
00809-0100-4811, Rev DA
Section 4: Basic Configuration/Start-Up
January 2015
Basic Configuration/Start-Up
Flexible Single HP
Rigid Single 0.5 in. (13 mm)
User Defined
Note
Flexible and rigid probes require different radar electronics and cannot be used with the same
transmitter head.
4.4.6 Product dielectric
For interface measurements, the dielectric constant of the upper product is essential for
calculating the interface level and the upper product thickness. By default, the Product
Dielectric parameter is about 2.
If the dielectric constant of the lower product is significantly smaller than the dielectric constant
of water, you may need to make special adjustments. See Interface measurements for
semi-transparent bottom products on page 96 for further information.The dielectric constant
of the product is used for setting the appropriate signal amplitude thresholds, see section
Service and Troubleshooting for more information on amplitude threshold settings. Normally,
this parameter does not need to be changed for level measurements. However, for some
products, measurement performance can be optimized by setting the proper product dielectric
constant.
The Rosemount Configuration Tool (RCT) software includes a Dielectric Chart which lists the
dielectric constants of a wide range of products. RCT also includes a tool which allows you to
calculate dielectric constants based on measurements of the Upper Product Thickness.
4.4.7 Vapor dielectric
In some applications, there is heavy vapor above the product surface having a significant
influence on the level measurement. In such cases, the vapor dielectric can be entered to
compensate for this effect.
The default value is equal to 1, which corresponds to the dielectric constant of vacuum.
Normally, this value does not need to be changed since the effect on measurement
performance is very small for most vapors.
4.4.8 Measurement mode
Normally, the measurement mode does not need to be changed. The transmitter is
pre-configured according to the specified model:
HART Comm
1, 3, 3, 3
HART Comm
1, 3, 3, 2
HART Comm
1, 3, 3, 4
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