IFM Electronic LR7300 Operating Manual

Operating instructions

Electronic level sensor

LR7300

80236090 / 00 03 / 2016

Contents

1 Preliminary note �� 4

1�1 Symbols used ��4

2 Safety instructions ��4

3 Items supplied��5

4 Functions and features ��5

4�1 Applications ��6

4�1�1 Restriction of the application area ��6

5 Function �� 7

5�1 Measuring principle ��7 5�2 Features of the unit �� 8

5�2�1 Easy set-up ��8 5�2�2 Display functions ��8 5�2�3 Switching functions �� 8 5�2�4 Offset for indicating the real level in the tank �� 9 5�2�5 Probes for different tank heights �� 9 5�2�6 Safe state ��9

5�3 IO-Link ��10

6 Installation�� 11

6�1 Installation location / environment �� 11 6�2 Installation of the probe ��14 6�3 Shortening of the probe ��15 6�4 Installation of the unit ��15

6�4�1 Installation in closed metal tanks (without flange plate) ��16 6�4�2 Installation in closed metal tanks (with flange plate) ��16 6�4�3 Installation in open tanks ��17 6�4�4 Installation in plastic tanks �� 18

6�5 Alignment of the sensor housing ��18

7 Electrical connection �� 19

8 Operating and display elements ��20

9 Menu �� 21

9�1 Menu structure �� 21 9�2 Explanation of the menu �� 22

10 Parameter setting ��23

10�1 Parameter setting in general ��23 10�2 Entering the probe length (unit on delivery) ��25 10�3 Configuration of the display ��25 10�4 Offset setting ��25 10�5 Setting of output signals ��26

10�5�1 Setting of the output function �� 26 10�5�2 Set the switching limits (hysteresis function) �� 26 10�5�3 Set the switching limits (window function) ��26 10�5�4 Setting of the switch-off delay �� 26 10�5�5 Response of the outputs in case of a fault ��26

10�5�6 Setting of the delay time after signal loss �� 27 10�6 Reset all parameters to factory setting ��27 10�7 Changing the probe length ��27

11 Operation ��28

11�1 Operating indicators �� 28 11�2 Read the set parameters ��28 11�3 Changing the display unit in the Run mode ��28 11�4 Error indications �� 29 11�5 Output response in different operating states ��30

12 Technical data and scale drawing �� 30

12�1 Setting ranges ��30

13 Servicing �� 31

14 Applications��32

14�1 Minimum level monitoring with early warning and alarm ��32 14�2 Pumping station / empty the tank with overflow protection ��33 14�3 Storage tank ��34

15 Factory setting ��35

1 Preliminary note

1.1 Symbols used

► Instructions > Reaction, result […] Designation of keys, buttons or indications → Cross-reference

Important note Non-compliance may result in malfunction or interference�

Information Supplementary note�

2 Safety instructions

• Please read this document prior to set-up of the unit� Ensure that the product is suitable for your application without any restrictions�

• If the operating instructions or the technical data are not adhered to, personal injury and/or damage to property can occur�

• Improper or non-intended use may lead to malfunctions of the unit or to unwanted effects in your application� That is why installation, electrical connection, set-up, operation and maintenance of the unit must be carried out by qualified personnel authorised by the machine operator�

• In order to guarantee the correct operation of the unit, it is necessary to use the

unit in media for which it is sufficiently resistant (→ Technical data).

• The responsibility as to the suitability of the unit for the application lies with the operator� The manufacturer assumes no liability for consequences of misuse by the operator�

• Improper installation and use of the unit result in a loss of the warranty claims

• The unit may cause radio interference in domestic areas� If interference occurs, the user must take appropriate remedial actions�

• The unit complies with the standard EN 61000-6-4 and is a class A product� The radiated energy of the microwaves is, for example, much below that of mobile phones� According to the current state of science the operation of the unit can be classified to be harmless to human health�

3 Items supplied

• Level sensor LR7300

• Operating instructions

In addition, the following is necessary for installation and operation:

• 1 rod

• Mounting material (if necessary, a launching plate → 4 Functions and features)

The following components are available as accessories:

Rods Length (cm / inch) Order number

15 / 5�9 E43225

24 / 9�5 E43203 30 / 11�8 E43226 45 / 17�7 E43204 50 / 19�7 E43227 70 / 27�6 E43205

100 / 39�4 E43207 120 / 47�2 E43208 140 / 55�1 E43209 160 / 63�0 E43210

Flange plate Size / process connection Order number

73 - 90 / ¾" NPT E43206

Only use rods from ifm electronic gmbh� The optimum function is not ensured when using components from other manufacturers�

4 Functions and features

The unit continuously detects the level in tanks and generates output signals according to the parameter settings�

2 switching outputs are available� They can be set separately�

For correct function the unit needs a large enough metal launching plate� It is necessary for transferring the microwave pulse to the tank with optimum transmission power�

The flange plates that are available as accessories are not sufficient as

launching plates (for suitable launching plates → 6.4).

For installation in closed metal tanks, the tank lid serves as a launching plate� For installation in open metal tanks, tanks made of plastic or metal tanks with plastic lids a sufficiently large fixing plate, a metal plate or

similar must be used (→ 6.4.3 / → 6.4.4).

Furthermore, minimum distances to tank walls, objects in the tank, bottom

of the tank and further level sensors must be adhered to (→ 6.1).

4.1 Applications

• Water, water-based media Application examples:

• Detection of coolant emulsion in a machine tool�

• Detection of cleaning liquid in a parts cleaning system�

4.1.1 Restriction of the application area

Incorrect measurements or signal loss may be caused by the following media:

- Highly absorbing surfaces (e�g� foam)�

- Intensely bubbling surfaces�

- Media which are very inhomogeneous, separate from each other thus forming separation layers (e�g� oil layer on water)�

► Check the function by performing an application test� ► Installation in a steady area (→ 6.1).

> In case of signal loss, the unit displays [E�033] and switches the

outputs to a defined state (→ 11.5).

• The unit is not suitable for media with a dielectric constant < 20 (e�g� oils, fats, plastic granulates, bulk material)�

• If the unit is to be used in acids or alkalis, in hygienic areas or in electroplating

applications: first check the compatibility of the product materials (→ Technical

data sheet) with the media to be monitored�

• The unit is not suitable for applications where the probe is subjected to permanent and high mechanical stress (e�g� strongly moving viscous media or strongly flowing media)�

• Use preferably in metal tanks� When installed in plastic tanks, deterioration caused by electromagnetic interference may occur (noise immunity according to EN61000-6-2)�

Corrective measures: → 6.4.4.

5 Function

5.1 Measuring principle

Fig. 5-1 Fig. 5-2

The unit operates to the principle of guided wave radar� It measures the level using electromagnetic pulses in the nanosecond range�

The pulses are transmitted by the sensor head and guided along the rod (fig� 5-1)� When they hit the medium to be detected they are reflected and guided back to the sensor (fig� 5-2)� The time between transmitting and receiving the pulse directly relates to the travelled distance (D) and the current level� The reference for distance measurement is the lower edge of the process connection�

5.2 Features of the unit

5.2.1 Easy set-up

• When operating voltage is applied to the unit for the first time, the probe length

must be entered. Then the unit is ready for operation (→ 10.2).

• If necessary, parameters for the output signals and optimisation of the

monitoring functions can be set (→ 10.3 to → 10.5).

• All settings can also be carried out before installation of the unit�

• Reset to the factory settings is possible�

• Electronic lock can be set to prevent unintentional operations�

5.2.2 Display functions

The unit displays the current level, either in cm, inch or in percent of the final value of the measuring range� Factory setting: inch� The display unit is defined by

programming (→ 10.3). In the Run mode, it can be temporarily switched between

length indication (cm / inch) and percentage:

► Briefly press [Set]�

> The selected unit is displayed for 15 s, the corresponding LED is lit� With each

push of the button the display type is changed�

The set unit of measurement and the switching status of the outputs are indicated by LEDs�

5.2.3 Switching functions

The unit signals via two switching outputs OUT1 / OUT2 that a set limit level has been reached or that the level is below the limit value� For each output the following switching functions can be selected:

• Hysteresis function / normally open (fig� 5-3): [OUx] = [Hno]�

• Hysteresis function / normally closed (fig� 5-3): [OUx] = [Hnc]�

First the set point (SPx) is set, then the reset point (rPx) with the requested difference�

• Window function / normally open (fig� 5-4): [OUx] = [Fno]�

• Window function / normally closed (fig� 5-4): [OUx] = [Fnc]�

The width of the window can be set by means of the difference between FHx and FLx� FHx = upper value, FLx = lower value�

Fig. 5-3 Fig. 5-4

L = level; HY = hysteresis; FE = window

• For each switching output a switch-off delay of max� 60 s can be set (e�g� for especially long pump cycles)�

5.2.4 Offset for indicating the real level in the tank

The zone between tank bottom and lower edge of the probe can be entered as offset value [OFS]� So display and switch points refer to the actual level�

5.2.5 Probes for different tank heights

• The unit can be installed in tanks of different sizes� Probes in different lengths are available� To adapt to the tank height, each probe can be shortened� The minimum probe length is 10 cm, the maximum probe length is 160 cm�

• Probe and housing can be rotated without restriction� This enables easy installation and orientation of the head of the unit after installation�

5.2.6 Safe state

• In case of a fault a safe state can be defined for each output�

• If a fault is detected or if the signal quality is below a minimum value, the outputs pass into the "safe state"� For this case the response of the outputs can be set via the parameters [FOU1], [FOU2]�

• Temporary loss of signal caused e�g� by turbulence or foam formation can be

suppressed by a delay time (→ 10.5.6 [dFo]). During the delay time the last

measured value is frozen� If the measured signal is received again in sufficient strength within the delay time, the unit continues to work in normal operation�

If, however, it is not received again in sufficient strength within the delay time, the outputs pass into the safe state�

In case of heavy foam formation and turbulence, note the examples of how

to create a steady area (→ 6.1).

5.3 IO-Link

General information

This unit has an IO-Link communication interface which requires an IO-Linkcapable module (IO-Link master) for operation�

The IO-Link interface enables direct access to the process and diagnostic data and provides the possibility to set the parameters of the unit during operation� In addition communication is possible via a point-to-point connection with a USB adapter cable�

Further information about IO-Link is available at www�ifm�com/gb/io-link�

Device-specific information

You will find the IODDs necessary for the configuration of the IO-Link unit and detailed information about process data structure, diagnostic information and parameter addresses at www�ifm�com/gb/io-link�

Parameter setting tools

You will find all necessary information about the required IO-Link hardware and software at www�ifm�com/gb/io-link�

6 Installation

6.1 Installation location / environment

• Vertical installation from the top is preferred�

• For a safe function, the unit requires a launching plate (→ 6.4).

• For optimum operation the unit is to be installed as near as possible to the tank wall� Distance between the rod and the tank wall: minimum 40 mm, maximum 300 mm�

• The following minimum distances between the rod and tank walls, objects in the tank (B), tank bottom and other level sensors must be adhered to:

50mm

10mm

100mm

40mm

• For tank walls which are not straight, steps, supports or other structures in the tank a distance of 50 mm to the tank wall must be adhered to�

• For probe lengths > 70 cm the rod can be considerably deflected by movement of the medium� To avoid contacting the tank wall or other structures in the tank in such cases, the minimum distances should be increased� Reference values:

Probe length Distance to the tank wall or structures in the tank 70��100 cm 100 mm 100��160 cm 180 mm

• If the medium is strongly polluted, there is the risk that a bridge forms between the rod and the tank wall or structures in the tank� To avoid incorrect measurements: adhere to increased minimum distances depending on type and intensity of the soiling�

+ 24 hidden pages

IFM Electronic LR7300 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual