Emerson Process Management rosemount 3300 series 5HIHUHQFH*DXJH+HLJKW, 3UREH/HQJWK, 3UREH7\SH

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00809-0100-4811, Rev AA October 2002

Rosemount 3300 Series

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The Reference Gauge Height is the distance from the Upper Reference Point to the bottom of the tank. The transmitter measures the distance to the product surface and subtracts this value from the Reference Gauge Height to determine the level.

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The probe length is the distance between the Upper Reference Point and the end of the probe. If a weight is used at the end of the probe it shall not be included.

This parameter is pre-configured at factory. It must be changed if the probe is shortened.

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The transmitter is designed to optimize measurement performance for each probe type.

This parameter is pre-configured at factory. This value needs to be changed if the probe type is changed.

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

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For interface measurements the dielectric constant of the upper product is essential in order to obtain good accuracy. See section “Interface” on page 2-9for further information on dielectric constants.

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 “Interface Measurements for Semi-Transparent Bottom Products” on page 6-5for further information.

For level measurements the Upper Product Dielectric parameter corresponds to the actual dielectric constant of the product in the tank. Normally this parameter does not need to be changed even if the actual dielectric constant of the product deviates from the Upper Product Dielectric parameter value. However, for some products measurement performance can be optimized by setting the proper product dielectric constant.

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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 dielectricity of vacuum. Normally this value does not need to be changed since the effect on measurement performance is very small for most vapors.

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This parameter should only be changed if there are measurement problems in the upper part of the tank. Such problems may occur if there are disturbing

objects close to the probe. By setting the Upper Null Zone the measuring range is reduced. See 6HFWLRQ￿￿￿￿'LVWXUEDQFHV￿DW￿WKH￿WRS￿RI￿WKH￿WDQN for

further information.

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