Emerson Process Management rosemount 3300 series 3UREH7\SH, 3URGXFW Lhohfwulf 9DSRULHOHFWULF

Rosemount 3300 Series

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00809-0100-4811, Rev AA October 2002

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The transmitter automatically makes an initial calibration based on the type of probe that is used. This parameter is pre-configured at factory and only needs to be set if the probe is changed to another type. Choose one of the following options:

•Rigid Twin Lead

•Flexible Twin Lead

•Coaxial

•Rigid Single Lead

•Flexible Single Lead

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Flexible and Rigid probes require different radar electronics and can not be used with the same transmitter head.

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 section ³,QWHUIDFH￿0HDVXUHPHQWV￿IRU￿6HPL￿7UDQVSDUHQW￿%RWWRP￿3URGXFWV´￿RQ￿

SDJH ￿￿￿ for further information.The dielectric constant of the product is used for setting the appropriate signal amplitude thresholds, see 6HFWLRQ￿￿￿￿6HUYLFH￿ DQG￿7URXEOHVKRRWLQJ 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 wich 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.

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 to be changed since the effect on measurement performance is very small for most vapors.

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