Operating Manual

Chapter 3 Set up Level, Level Alarms, and Volume Accu-Wave

3-2 TN Technologies

Set up Primary Measurement (Distance or Level)

During the initial setup, you will be asked to enter the distances to the highest and lowest

points on the tank that you need the gauge to “see.” Thus, you need to measure these

distances on your tank relative to the reference line marked on the sensor. Note the high

and low measurement points do not have to be the top and bottom of the tank. These points

are used to establish the range of interest (ROI) as shown in Figure 3.2. The ROI defines

the range over which the gauge looks for the echo from the process material surface. The

ROI may be overridden in the “Radar fine tuning” menu (refer to Chapter 5).

You must set up either distance or level as the primary measurement before setting up

other measurements. The Accu-Wave software numbers the measurements with

measurement #1 being the primary measurement. It is good practice to make a list of how

you set up each measurement and its measurement number, and to have this list available

for future reference.

Select distance as the primary measurement if you are interested in the distance from the

zero distance point to the surface of the process material as shown on the right-hand side

of Figure 3.2. Select level as the primary measurement, if you are interested in the distance

from the zero level point to the current level of the surface of the process material as

shown on the left-hand side of Figure 3.2.

The Zero Distance, Maximum Distance, and Zero Level points are all measured from the

reference line (inscribed in the sensor housing) downward to the appropriate point on the

tank. The Maximum Level point is measured from the Zero Level point upward.

Figure 3.2 Primary Measurement – Distance or Level

After setting up the required entries for the primary measurement, you can set up

additional measurements (for example, volume, percent full and percent empty) using the

“Set Up Additional Measurements” menu discussed in Chapter 4.

“Set up Level” Menu

The “Set up Level” portion of the “Set up Level, Level Alarms, and Volume” Menu is

used to set up the primary measurement, either level or distance, for your gauge. These

menu items are given in the table below in the order they appear as you scroll through the

Reference Line

(marked on sensor)

Maximum Distance

Zero Level

Maximum Level

Range of Interest

(ROI) for level

Range of Interest

(ROI) for distance