TROUBLESHOOTING
The sensor may show erroneous readings if its antenna becomes contaminated with asphalt residues. If this happens you must remove the sensor unit and clean the antenna using a solvent that will dissolve asphalt. Before removing the sensor be absolutely sure to mark its position so it can be reinstalled in the same position. Otherwise, all of the false echo memory information will be useless and the sensor will not function properly.
Note: The sensor has a small hole drilled in the side of its stainless steel body. This hole should always point towards the center of the tank.
REVISIONS TO SETTINGS IN FIGURE 4
Recent changes to the settings shown in Figure 4 are highlighted in yellow.
Two settings were changed by this revision (dated 10-11-04). They provide increased protection against accidental overflow and immersion of the radar antenna. These two settings are 1.1 Min. adjustment and 1.2 Max. adjustment.
Changes to another setting were made in revision dated 8-19-04. This setting was to 1.3 Medium. It changed from Liquid unknown to Liquid DK<3.
If the settings of your radar unit were made prior to this revision, you should make the changes noted above. The changes are easy to make using the buttons on the PLICSCOM.
EFFECT ON HONEYWELL CONTROLLER
Changes made to the two settings changed by this revision (10-11-04) affect the Honeywell controller used with the radar unit. Consequently, Heatec Tec-Note 5-04-120 Setting Honeywell controller used with Heatec vertical asphalt tanks, also has a revision dated 10-11-04.
It is extremely important for you to change the settings of the Honeywell controller when you change the settings of the radar unit! Failue to change these settings will result in erroneous level indications and improper shutoff control!