Appendix, 4 glossary – KROHNE OPTIFLEX 1300C EN User Manual

Page 184

APPENDIX

184

OPTIFLEX 1300 C

www.krohne.com

03/2014 - 4000172306 - HB OPTIFLEX 1300 R07 en

10.4 Glossary

Cable

This is a wire rope. It is used as a measurement pulse guide.

Dielectric constant

An electrical property of the product to be measured used in TDR
measurement. Also known as εr, DK and relative permittivity. This gives the
strength of the measurement pulse reflected back to the device's signal
converter.

Direct mode

The device sends a signal along the probe. It receives the reflection of the
signal from the surface of the tank contents. The device uses an algorithm
to convert the time it takes to receive the signal into a distance. Use of this
measurement mode depends on the minimum dielectric constant limit of
the probe type. For more data, refer to

Technical data

on page 130. Refer

also to TBF mode

TBF mode

TBF mode.

Discontinuities

These are objects or parts of objects (including the tank) that are in the
tank, are possibly in the probe's empty space and can potentially influence
the electromagnetic field around the probe. This can cause a measurement
error. Also refer to

General requirements

on page 24.

Distance

This is a display option. It is the distance from the face of flange to the level
(1 product) or the surface of the top product (2 or more products). Refer to
the diagrams at the end of this section.

Electromagnetic compatibility

Electromagnetic compatibility Defines how much a device influences or is influenced by other devices that

generate electromagnetic fields during operation. Refer to European
standard EN 61326-1 for further details.

Electromagnetic field

This is a physical field that is produced by electrically-charged objects and
which may affect the behaviour of other objects near to the field.

Empty space

A minimum diameter around a probe that should have no objects in it for
the device to work correctly. This depends on the probe type. Refer to
Installation

Installation

Installation for more details.

Emulsion

These are small particles of one liquid that readily disperse in another
liquid. An emulsion is usually a dispersion of water in oil or a dispersion of
oil in water. Possible causes are mixing or tank filling. Emulsions usually
separate back into their constituent parts over time. For accurate interface
measurement to be possible, the top product and emulsion must have
stable dielectric constant values. The way the device measures interface
will depend on the type of emulsion:
If the emulsion is a constant mix of more than 5% water, the device
measures interface from the top of the emulsion.
If the emulsion separates gradually from 0 to 100% water, the device
measures interface at the bottom of the emulsion.