Process Applications; Single Liquid; Two Liquid Applications; Figure 2-11: Two-Liquids Flooded - Honeywell SmartLine SLG 700 User Manual

2.5 Process Applications

The SLG 700 Level transmitter is designed to work with a wide range of process
conditions. The sensor offers a total of 5 application modes:





New in R200 are Steam applications (discussed in Section 2.5.4) and the Low DC
Measurement. The latter is applicable when the dielectric of the medium is so low that barely
any of the radar pulse is reflected, see 2.5.2. Also new for R200 is that the applications other
than Single Liquid are licensed options, that is, a license key must be obtained from the
factory and entered into the transmitter before that application will become operational.

Single Liquid

The most common application is Single Liquid where only a distance to the upper surface
measurement is performed. It is possible that the dielectric of the air or gas above the
liquid has a different dielectric constant from unity, but in most conditions, the vapor DC
can be set to 1.
Measurements can be made in turbulent conditions or foaming conditions. However, in some
situations special precautions must be taken (see Section 2.6).

Two Liquid Applications

The flooded and non-flooded applications are both available with the same license key. The
flooded application is essentially a single surface measurement but in the case where a tank is
always fully filled with two liquids and the position of the interface between then varies. The
measured level is that of the interface.
Page 28
Single Liquid
Two Liquids, flooded (only interface between to liquids is measured)
Two Liquids, non-flooded (surface and interface are both measured)
Steam Applications (single water-steam interface is measured)
Low-Dielectric Single Liquid Measurements (the end of the probe is
measured and the surface level is estimated from that and the DC).

Figure 2-11: Two-liquids Flooded

SLG 700 SmartLine Level Transmitter User's Manual
Revision 8