49
BE 57-660 Eclipse Model 700 Guided Wave Radar Transmitter
3.4
Configuration Information
This section is intended to offer additional configuration-
related details with respect to some of the parameters
shown in the Menu in Section 2.6.5.
3.4.1 Level Offset Description
The parameter referred to as Level Offset in the ECLIPSE
Model 700 DEVICE SETUP/BASIC CONFIG menu is
defined as the desired level reading when liquid surface is
at the tip of the probe.
The ECLIPSE Model 700 transmitter is shipped from the
factory with Level Offset set to 0. With this configuration,
all measurements are referenced from the bottom of the
probe. See Example 1.
Example 1 (Level Offset = 0 as shipped from factory):
Application calls for a 90-cm Model 7zT coaxial probe
with an NPT process connection. The process medium is
water with the bottom of the probe 10 inches above the
bottom of the tank.
The user wants the 4 mA Set Point (LRV) at 24 cm and
the 20 mA Set Point (URV) at 60 cm
as referenced from
the bottom of the probe
.
In those applications in which it is desired to reference all
measurements from the bottom of the vessel, the value of
Level Offset should be changed to the distance between the
bottom of the probe and the bottom of the vessel as shown
in Example 2.
Example 2:
Application calls for a 90-cm Model 7zT coaxial probe
with an NPT process connection. The process medium is
water with the bottom of the probe 10 inches above the
bottom of the tank.
The user wants the 4 mA Set Point (LRV) at 24 cm and
the 20 mA Set Point (URV) at 60 cm
as referenced from
the bottom of the tank
.
When the ECLIPSE transmitter is mounted in a
chamber/bridle, it is usually desirable to configure the unit
with the 4 mA Set Point (LRV) at the lower process con-
nection and the 20 mA Set Point (URV) at the upper
process connection. The measuring range then becomes the
center-to-center dimension. In this case, a negative Level
Offset needs to be entered. In doing so, all measurements
are then referenced at a point up on the probe, as shown in
Example 3.
10"
60"
20 mA
4 mA
24"
Level Units = inches
Probe Model = 7zT
Probe Mount = NPT
Probe Length = 72 in
Level Offset = 0 in
Dielectric Range =
Above 10
4 mA = 24 in
20 mA = 60 in
Example 1
10"
60"
20 mA
4 mA
24"
Level Units = inches
Probe Model = 7zT
Probe Mount = NPT
Probe Length = 72 in
Level Offset = 10 in
Dielectric Range =
Above 10
4 mA = 24 in
20 mA = 60 in
Example 2
20 mA
Level Units = Centimeters
Probe Model = 7YT
Probe Mount = NPT
Probe Length = 90 cm
Level Offset = 0 cm
Dielectric Range = Above 10
4 mA = 24 cm
20 mA = 60 cm
4 mA
60 cm
24 cm
10 cm
Level Units = Centimeters
Probe Model = 7YT
Probe Mount = NPT
Probe Length = 90 cm
Level Offset = 0 cm
Dielectric Range = Above 10
4 mA = 24 cm
20 mA = 60 cm
20 mA
4 mA
60 cm
24 cm
10 cm
