KROHNE LS-72xx User Manual
Installation and
Operating Instructions
LS 72xx
Conductive mono-rod level sensor
Variable area flowmeters
Vortex flowmeters
Flow controllers
Electromagnetic flowmeters
Ultrasonic flowmeters
Mass flowmeters
Level measuring instruments
Communications engineering
Engineering systems and solutions
Switches, counters, displays and recorders
Heat metering
© KROHNE 02/2013 Pressure and temperature
Contents
Items supplied .................................................................................................................................... 3
System description ............................................................................................................................ 3
Product liability and warranty ............................................................................................................. 3
CE / EMC / Standards / Approvals ..................................................................................................... 3
1 Installation ............................................................................................................................... 4
1.1 Mechanical installation .............................................................................................................. 4
1.2 Process connection ................................................................................................................... 4
1.3 Mounting of 3A marked products ............................................................................................... 5
2 Electrical connection .............................................................................................................. 6
2.1 Connection plan ........................................................................................................................ 7
2.2 Initial start-up ............................................................................................................................. 7
2.3 Operator control ........................................................................................................................ 7
3 Fault diagnosis and corrective actions ................................................................................. 7
4 Technical data ......................................................................................................................... 8
4.1 Technical data table .................................................................................................................. 8
4.2 Dimensions ............................................................................................................................... 9
5 Type code .............................................................................................................................. 10
5.1 Ordering code ......................................................................................................................... 10
5.2 Spare parts .............................................................................................................................. 10
5.3 Accessories ............................................................................................................................. 10
6 Product description .............................................................................................................. 11
6.1 Applications ............................................................................................................................. 11
6.2 Functional principle ................................................................................................................. 11
6.3 Construction ............................................................................................................................ 11
6.4 Features .................................................................................................................................. 11
7 Notes ...................................................................................................................................... 12
If you need to return a device for testing or repair to KROHNE ....................................................... 15
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Items supplied
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• Measuring instrument
• Hygienic adapter
• Installation and operating instructions
System description
Inputting physical quantities into an SPC or PLC or other computer and control systems requires
accurate and reliably working sensors. The sensor is a detecting element that converts physical
quantities, such as temperature, level, pressure, conductivity, turbidity and flow, into an electrical
signal. Locally further processed, usually by an integrated microcontroller, the measuring signal can
be transmitted by analogue (e.g. 4...20mA loop) or digital (e.g. Profibus PA) means.
The conductive mono-rod-level sensors of the LS Series are designed to detect the level of
conductive liquids. Since the rod electrodes can be shortened to any required length, this allows
flexibility in the choice of the operating point.
Product liability and warranty
The instrument is designed solely for detecting the interface between conductive liquids.
Responsibility as to suitability and intended use of this instrument rests solely with the operator.
Improper installation and operation of the instrument / system may lead to loss of warranty.
In addition, all claims are subject to the “General terms and conditions of sale” under which this
instrument was purchased.
If a meter or instrument needs to be returned to KROHNE, please note the information given on the
last-but-one page of these Instructions.
KROHNE regrets that it cannot repair or check your instruments unless accompanied by a fully
completed Service and Repair sheet.
CE / EMC / Standards / Approvals
(applicable only with integrated electronic evaluator)
The product bears the CE marking on account of compliance with and application of the following
standards:
EMCG (89/336/EEC)
EN 50081-1 EN 55022 Class B
EN 61000-6-2 EN 61000-4-2 ESD 4/8 kV
EN 61000-4-3 RF radiated 10 V/m
EN 61000-4-4 Burst 4 kV
EN 61000-4-5 Surge 1 kV sym., 2 kV unsym.
EN 61000-4-6 RF cable 10 V
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1 Installation
1.1 Mechanical installation
• Use only the recommended sleeves or adapters. If other systems are used, no guarantee can
be given for proper functioning or leak-tightness.
• The connection thread must have direct electrical contact with the threaded sleeve and the
metal vessel.
• Do not use Teflon or paper gaskets.
• The stub electrode can be used in electrically non-conducting vessels (e.g. plastic tanks) if
the screw-in sleeve has a metal surface that can be used as reference ground.
• The tightening torque for the sleeve should be between 10 and
20 Nm.
• The rod electrodes can be shortened to any required length (by clipping, sawing, etc). Make
sure not to damage the coating or the insulating part.
• Insulated rods: remove about 10 mm of the coating from the end of the rod, using an abrasive
disc, a sanding belt or a sharp knife.
• Make absolutely sure that the rod electrode cannot come into contact with the pipe or tank
wall. Also take into consideration the fact that the rod may be deflected by movement in the
liquid product. If necessary, select a more favourable mounting location.
1.2 Process connection
The hygienic ½” process sleeve is easy to weld in into tanks or pipes. The kind of assembly allows
installation in conformity with standards of hygiene (to EHEDG, FDA). The G1/2” and G1”
connections can be mounted in any counter thread acc. to ISO 228.
Various hygienic adapter sleeves (refer to chapter “Accessories”) are available for fitting to other
process connections. For more information refer to data sheet “Accessories”
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1.3 Mounting of 3A marked products
The 3A mark is valid only when the product is mounted in a 3A marked counterpart and installed acc.
to the installation manual. Use also a 3A marked O-ring or gasket if relevant.
The 3A marked products conforms to the 3A sanitary standards criteria. Materials and surfaces fulfil
the FDA demands and are certified by EHEDG.
EPDM O-rings supplied with 3A marked products are conform to sanitary standards class II (8% milk
fat).
1) Use only 3A approved counterparts
2) The inspection hole should be visible and drained. Face it downwards that leaking can be
observed.
3) Mount the device in a self-drained position.
4) Level the inner surface of the pipe with the counterpart.
5) Weld from the inside of the tank, if possible. Welds shall be free from cracks, crevices
and grooves. Weldings should be grinded to Ra= 0.8
Mounting of 3A products in pipe installations (A) or tank installations (B)
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