CMD
Installation and
Operating Instructions
LEM 300
Double level control unit
for LS 7000 series
©
KROHNE 02/2006 7.02575.21.00
Subject to change without notice.
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Contents
Description....................................................................................................................................3
Product liability and warranty .....................................................................................................3
1
Safety Instructions................................................................................................................. 4
2
Description ............................................................................................................................. 4
3
Technical data ........................................................................................................................ 5
4
Application Example.............................................................................................................. 6
4.1 Example 1 ............................................................................................................................6
4.2 Example 2 ............................................................................................................................7
4.3 Example 3 ............................................................................................................................8
4.4 Example 4 ............................................................................................................................9
4.5 Example 5 ..........................................................................................................................10
If you need to return a device for testing or repair to KROHNE............................................. 11
2 Installation and Operating Instructions LEM 300
Description
The Double Level Control Unit has two independent, galvanically separated electrical circuits.
Each circuit controls a relay with Normally Open contacts. The status of each relay changes as a
function of the two resistance inputs.
The two inputs act with a hysteresis. The sensibility of the relay circuit can be adjusted from the
front of the module. LED´s indicates an activated relay.
The module can be used as an evaluation module for LS 7000 series sensors. Please refer to the
application example(s).
Product liability and warranty
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 they are accompanied by
a fully completed Service and Repair sheet.
Installation and Operating Instructions LEM 300 3
1 Safety Instructions
This instrument is built and tested according to the specifications and packed in technically safe
condition. In order to maintain this condition and to ensure safe operation, the user shall follow the
hints and warnings given in this instruction.
WARNING
During the installation the valid national rules have to be observed.
Ignoring the warnings may lead to severe personal injury or substantial damage
to property.
The product shall be operated by trained staff. Correct and safe operation of this equipment is
dependent on proper transport, storage, installation and operation.
All electrical wiring shall conform to local standards. In order to prevent stray electrical radiation,
we recommend twisted and shielded input cables, as also to keep mains supply cables separated
from the input cables. The connection shall be made according to the connecting diagrams.
2 Description
The Double Level Control Unit has two independent, galvanically separated electrical circuits.
Each circuit controls a relay with Normally Open contacts. The status of each relay changes as a
function of the two resistance inputs.
The two inputs act with a hysteresis. The sensibility of the relay circuit can be adjusted from the
front of the module. LED´s indicates an activated relay.
The module can be used as an evaluation module for LS 7000 series sensors. Please refer to the
application example(s).
4 Installation and Operating Instructions LEM 300
3 Technical data
Input
Range 7...100 KOhm (adjustable)
Probe voltage 24 V AC
Probe current 4 mA
Environmental conditions
Operating temperature -20...+50°C
Storage temperature -50...+85°C
Humidity <85% RH, non-condensing
EMC data
Generic standards EN 61000-6-3, EN 61000-6-2
LVD standards EN 61010-1, EN60204-1
Mechanical data
Dimensions 91.5 x 98 x 35 mm
DIN-rail mounting DIN 46277
Protection class Housing: IP 20
Weight 0.325 kg
Power supply
Supply range 230 V AC (+10 /-15%)
Frequency 50/60 Hz
Power consumption 15 mA
Output Relay
Resistive load AC: 250 V / 10 A
DC: 200 V / 0.4 A
DC: 24 V / 10 A
Inductive load AC: 250 V / 5 A
DC: 24 V / 5 A
Mechanical life cycle >30 x 106 operations
Operation voltage 250...440 V AC
Disposal of product and packing
According to national laws or by returning to KROHNE
Installation and Operating Instructions LEM 300 5
4 Application Example
4.1 Example 1
A tank is being filled with waste water. Pump 1 is supplying a filter unit. Pump 2 is securing the
tank from overflowing.
Tank: Metal
Ground: Via the LS 72XX process connection
Instrument: LS 7240, 4 coated rods.
< Y1 level: Stop Pump 1
> Y2 level: Start Pump 1
< Y3 level: Stop Pump 2
> Y4 level: Start Pump 2
Y1
Y2
Y3
Y4
Switch (Pump 1)
Switch (Pump 2)
5
Z1
Y1
Y2
Y3
4
6
2
5
3
3
6
4
1 Switches »Normally open«
2 230 V AC
3 Pump 1
4 Pump 2
Max.
5
Min.
6
6 Installation and Operating Instructions LEM 300
Y4 A1
A2
1
11 14
21
34
4.2 Example 2
Pump1 is filling a tank to a certain level. The alarm is securing the tank from overflowing.
Tank: Non-Metal
Ground: Via one uncoated rod
Instrument: LS 7240, 3 coated rods, 1 uncoated.
<Y1 level: Start Pump1
>Y2 level: Stop Pump1
Y3 + Y4 level: Alarm
1
5
1 Switches »Normally open«
2 230 V AC
3 Alarm
4 Reversing relay
5 Pump 1
Z1
Y1 Y2
2
Y3
A1 A2
Y4
3
11
14 21 34
4
Installation and Operating Instructions LEM 300 7
4.3 Example 3
A tank is being filled with waste water. Pump 1 is supplying a filter unit. Pump 2 is securing the
tank from overflowing.
Tank: Non-metal
Ground: Via one uncoated rod
Instrument: LS 7240, 3 coated rods, 1 uncoated.
< Y1 + Y3 level: Stop Pump 1 + Pump 2
> Y2 level: Start Pump 1
> Y4 level: Start Pump 2
1
11
Z1 Y1 Y2
2
Y3
Y4
A1 A2
14
21
34
1 Switches »Normally open«
2 230 V AC
3 Pump 1
4 Pump 2
3
4
8 Installation and Operating Instructions LEM 300
A
A
4.4 Example 4
Tank 1 is being filled with water and emptied via a water tap. Security valve1 is securing the tank
from overflowing.
Tank 1: Metal
Ground: Via the LS 72XX process connection.
Instrument: LS 7240, 2 coated rods.
< Y1 level: Close valve1
> Y2 level: Open valve1
Tank 2 is filled via pump 2 and emptied via a water tap.
Tank 2: Metal
Ground: Via the LS 72XX process connection.
Instrument: LS 7240, 2 coated rods.
< Y3 level: Start Pump 2
> Y4 level: Stop Pump 2
Z1
Y1 Y2
Y3
Y4
1
34
21
14
2 11
1
2
7
6
1 Switches »Normally open«
2 230 V AC
3 Reversing relay 2
4 Pump 2
5 Tank 2
6 Valve 1
7 Tank 1
3
4
5
Installation and Operating Instructions LEM 300 9
A
4.5 Example 5
Tank 1 and Tank 2 are being filled with water via Pump 1 and Pump 2.
Tank 1: Metal
Ground 1: Via the LS 72XX process connection
Instrument 1: LS 7200 - stub version.
Tank 2: Non-metal
Ground 2: Via one uncoated rod
Instrument 2: LS 7XXX- one coated rod - one uncoated rod.
Power on: Start Pump 1 and Pump 2
< Y1 + Y2 level: Start Pump 1
< Y3 + Y4 level: Start Pump 2
> Y1 + Y2 level: Stop Pump 1
> Y3 + Y4 level: Stop Pump 2
1
2
Z1
8
7
6
1 Switches »Normally open«
2 230 V AC
3 Reversing relay 2
4 Pump 2
5 Tank 2
6 Tank 1
7 Pump 1
8 Reversing relay 1
Y4 Y3 Y2 Y1
1
21 34 14 11 A2
3
4
5
10 Installation and Operating Instructions LEM 300
If you need to return a device for testing or repair to KROHNE
Your instrument has been carefully
manufactured and tested. If installed and
operated in accordance with these operating
instructions, your instrument will rarely present
any problems. Should you nevertheless need
to return an instrument for checkout or repair,
please pay strict attention to the following
points:
Due to statutory regulations concerning
protection of the environment and
safeguarding the health and safety of our
personnel, KROHNE may only handle, test
and repair returned instruments that have
been in contact with liquids if it is possible to
do so without risk to personnel and
environment.
This means that KROHNE can only service
your instrument if it is accompanied by a
certificate in line with the following model
confirming that the instrument is safe to
handle.
S P E C I M E N certificate
Company: ……………………………………….. Address: ……………………………………………
Department: …………………………………….. Name: ………………………………………………
Tel. No.: ………………………………………….
The enclosed instrument
Type: …………………………………………………………………………………………………………
KROHNE Order No. or Series No ………………………………………………………………………...
has been operated with the following liquid: ……………………………………………………………..
Because this liquid is
water-endangering * / toxic * / caustic * / flammable *
we have
– checked that all cavities in the instrument are free from such substances *
– flushed out and neutralized all cavities in the flowmeter *
(* delete if not applicable)
We confirm that there is no risk to man or environment through any residual liquid contained in the
instrument.
Date: ………………………….. Signature: ……………………………………………………………..
Company stamp:
Installation and Operating Instructions LEM 300 11
If the instrument has been operated with toxic,
caustic, flammable or water-endangering liquids,
you are kindly requested
• to check and ensure, if necessary by rinsing
or neutralizing, that all cavities in the
instrument are free from such dangerous
substances.
(Directions on how you can find out whether
the primary head has to be opened and then
flushed out or neutralized are obtainable from
KROHNE on request.)
• to enclose a certificate with the instrument
confirming that the instrument is safe to
handle and stating the liquid used.
KROHNE regret that they cannot service your
instrument unless it is accompanied by such a
certificate.
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