Users Manual Part 2
Table Of Contents
- Contents
- 1 Preliminary note
- 2 Safety instructions
- 3 Intended use
- 4 Items supplied
- 5 Function
- 6 Mounting
- 7 Electrical connection
- 8 Parameter setting
- 9 Operation
- 10 Troubleshooting
- 10.1 Troubleshooting incorrect level readings
- 10.1.1 Level too high / too low
- 10.1.2 Measured value is stuck
- 10.1.3 Measured value drops when level close to antenna
- 10.1.4 Measured value fluctuates
- 10.1.5 Measured value is occasionally unstable
- 10.1.6 Lagging of measured value during rapid level changes
- 10.1.7 Measured value correct at 0% (4 mA) but incorrect at 100% (20 mA)
- 10.1.8 Incorrect measured value when level is above 50%
- 10.1.9 Measured value drops to zero close to tank bottom
- 10.1.10 Level measurement is lost in an empty tank
- 10.1.11 Alert mode when level close to tank bottom
- 10.1 Troubleshooting incorrect level readings
- 11 Maintenance, repair and disposal
- 12 Factory setting
- 13 Appendix
Electronic level sensor LW2720
7
CIP process:
The unit withstands standard CIP routines and SIP routines up to
140°C.
Optimisation of cleaning agent storage.
3.2 Restriction of the application area
• The unit is not suitable for some bulk materials (e.g. coffee beans) due to their often very low
dielectric constant.
• Detection of bulk materials with a higher dielectric constant (e.g. grist due to its higher moisture
content) may be possible. See: Reflectivity, effect of dielectric constant (Ò/9)
u Check the function by performing an application test.
• The unit is a TLPR device. TLPR (Tank Level Probing Radar) equipment are devices for level
measurement in a closed space only (i.e. metallic, reinforced concrete or fibreglass tanks, or
similar enclosure structures made of comparable attenuating material).
u Installation must be carried out in accordance with the requirements of the following
standard: ETSI EN 302 372 (TLPR), Annex E
• Use preferably in metal tanks. When used in electrically non-conductive tanks (e.g. fibreglass
tanks):
– there may be deterioration caused by electromagnetic interference from other devices (noise
immunity according to EN 61326-1). Corrective measures: Non-metallic tanks (Ò/15)
– or if the mounting position is unfavourable, nearby objects outside the tank may cause
disturbing echoes.
Incorrect measurements may be caused by the following media:
• heavily foaming or turbulent surfaces.
• media which are very inhomogeneous, separate from each other thus forming separation layers
(e.g. oil layer on water).
u Check the function by performing an application test.
u Installation in a steady area.
w In case of permanent signal loss, the unit generates an error message and switches the outputs to
a defined state.
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