Dwyer UTS - Manual (Page 13)

Setting the Application Type
The Series UT main menu displays (by default) LIQUID for models intended for
liquid. Series UT model intended for diameter displays SOLID, LIQUID,
STORAGE I, II and PROCESS (refer to Chapter 6, Diameter Mode Setup).
When Series UT unit is configured as either LIQUID or FLOW (open channel)
model, selecting FLOW option from the indication mode automatically selects the
FLOW option in the application types menu. This should be done before entering
values for other functions, so that all values are automatically adjusted for flow.
To Set the Application Type:
Setting the Operation Modes
The operation modes function enables you to set Series UT to compensate for
environmental conditions that affect the measurement readings.
(For diameter applications, available only for Series UTC model, refer to Chapter 6,
Diameter Mode Setup).
The modes settings are defined by making a selection from the STORAGE I,
STORAGE II and PROCESS options in the main menu; in some cases in
combination with the selection of the LIQUID application. The mode functions and
setup are described in the following sections.
Liquid Modes
Three modes are available for Series UT liquid application models. Each mode is
recommended for use as follows:
• : Recommended in the following conditions:
• Wavy surfaces
• Slow filling/emptying rate
• Applications where the sensor is installed near the tank wall
• : (Twice as fast as STORAGE I.)
Recommended in the following conditions:
• Reasonable surface conditions
• Applications requiring fast readings
• : This mode is suitable for applications where a fast reading is more
important than precision. A reading will be displayed within a short
time, even if the signal processing procedure was not completed.
Recommended in the following conditions:
• Foamy top surface
• Presence of agitation
• Presence of vapor
• Applications requiring very fast readings
Setting the Sensor Offset
Series UT takes measurements from the tip of the sensor. However, when the
sensor is located at a point that is above or below the true height of the tank, you
can use the MAN function to enter the difference. This may be required, for
example, if the sensor is installed at the top of an external pipe, or at the base of
an internal pipe in the tank.
When the sensor is located above the tank height, the difference must be
subtracted from the actual measurements, so the offset distance is entered as a
negative value and vise versa. The maximum permitted offset value is 2.0 m, and
the minimum permitted value is -2.0 m. Values can be entered in meter units only.
To Set the Sensor Offset Value:
Setting the Scan Distance Values
Up to eight interfering signals (false echoes) can be located by Series UT and
stored in its memory. The false echoes, which may be caused by obstructions such
as a tank agitator or a side wall, can generate false readings and so interfere with
the true scanning of the tank contents. Defining interfering signals is done while the
tank is empty.
Each scan distance reading is stored as an interfering signal until a reading is
achieved that indicates the true echo. If eight interfering signals are already stored
and a ninth reading is received, the first value stored is deleted and the new one
saved.
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Press/Action Display
For example.
Explanation
With the required option flashing,
depending on the type of model in use.
Displays the selected option for a few
seconds, and then re-displays the main
menu.
NOTES:
The operation modes are not relevant for flow applications. If one of the
STORAGE I, STORAGE II or PROCESS options is selected when Series UT is in
FLOW application mode, an warning message is displayed and Series
UT reverts to distance mode. You must then reset the unit to flow mode.
NOTES:
STORAGE I and STORAGE II liquid modes are not suitable for measuring
surfaces with foam, since these modes cannot perform signal processing.
Press/Action Display Explanation
With the required option flashing.
Default value.
Use to toggle the first digit between a
negative (-) or positive (0) value.
Continue to enter new values for the
remaining five digits. or
or
or
or
Figure 15: Scan Distance Process