LR7024 - Electronic level sensor IFM - Free user manual and instructions

Product type	Guided microwave radar level sensor
Brand	IFM
Model	LR7024
Probe length (delivery)	700 mm (70 cm)
Measuring range (SPx)	1.5...66 cm (0.6...26.0 inch)
Supply voltage	18...30 V DC
Max. output current	200 mA
Electrical protection	Short circuit, reverse polarity, overload
Current consumption	< 80 mA
Set point accuracy	± 5% of final value
Repeatability	± 2% of final value
Ambient temperature	0...60 °C
Fluid temperature	0...80 °C
Max. tank pressure	0.5 bar
Housing material	Stainless steel 304, FKM, NBR, PBT, PC, PEI, TPE/V, PTFE
Materials in contact with fluid	Stainless steel 303, PTFE, NBR
Protection rating	IP 67, III
Switching outputs	2 freely configurable outputs (OUT1, OUT2)
Switching functions	Hysteresis or window, normally open or closed
Switching delay	0...5 s in 0.2 s steps
Display	Alphanumeric 4 digits, unit LED (cm/in) and status LED
Mounting	Process connection G 3/4, threaded flange or bracket for open tank
Minimum probe length	150 mm (shortenable)
Dead zone (BD)	40 mm
Probe dimensions (L × A)	700 mm × 650 mm (active zone 650 mm)
Accessories	Probes (240, 450, 700 mm), threaded flanges
Maintenance and cleaning	Clean probe and process connection if display shows Err1
Safety	Installation by electrician, PELV/SELV supply, metal tank required
Warranty and repairability	Spare parts available (probes, flanges); repair by IFM
User manual	French user manual, 67 pages, available free of charge

Frequently Asked Questions - LR7024 IFM

How to shorten the LR7024 sensor probe?

Unscrew the probe, cut it to the desired length (minimum 150 mm), deburr, then screw it back with a torque of 4 Nm. Then set the new length in the LEnG menu.

What to do if the display shows Err1?

Err1 indicates a measurement signal out of range or a loss of signal. Clean the probe and process connection, check minimum mounting distances (walls, dead zone) and level plausibility. Correct the fault then perform a reset (power off then on).

What are the functions of the two switching outputs?

The outputs OUT1 and OUT2 can be independently configured in hysteresis mode (Hno/Hnc) or window mode (Fno/Fnc). They switch according to the set SPx and rPx thresholds. Each output can also have a switching delay of 0 to 5 seconds.

How to set the switching thresholds SP and rP?

Use the Mode/Enter buttons to navigate the menu and Set to modify values. First set SP (upper threshold), then rP (lower threshold). The difference creates hysteresis or window width. Values must be within the probe's measuring range.

Can I use the sensor in a plastic tank?

No, the device requires a metal tank for measurement signal transmission. It is not suitable for plastic covers. Use a metal plate at least 150 mm on each side for open tanks.

What fluids can be detected?

The sensor is designed for aqueous liquids (dielectric constant >20) such as watering liquids, lubricants and detergents. Not suitable for oils, greases, acids, bases, powders or bulk materials.

What is the dead zone (BD) and how to avoid it?

The dead zone is a 40 mm region under the thread where measurement is not reliable. The level must not exceed this zone by more than 10 mm, otherwise errors occur. Provide a weir to keep the level below this zone.

How to orient the housing after installation?

The housing can be rotated 360° relative to the thread. Gently turn it to the desired position without risk of damage. The probe is also rotatable to facilitate assembly/disassembly.

How to configure a switching delay?

In the extended menu (EF), set dr1 and dr2 for each output. The delay applies only in hysteresis mode. Set the value from 0 to 5 seconds in 0.2 s steps. Confirm with the Mode/Enter button.

What does the 'FULL' display mean?

The 'FULL' display accompanied by the maximum value indicates an overflow: the level exceeds the maximum measuring range. If the level remains above, measurement errors may occur. Reduce the level or adjust the programming.

USER MANUAL LR7024 IFM

Operating instructions

Electronic level sensor

Line drawing of a handheld electronic device with a circular button and handle (no text or symbols)

Inhalt

Diagram of a vertical device with directional arrows indicating flow or movement, no text or symbols present

2

Funktionsübersicht

Two technical diagrams showing a device with labeled component D, one with a crosshair and arrow indicator, the other with a crossed line (no text or symbols)

Zu 3:

50mm 100mm 40mm 10mm B

Technical diagram showing two mechanical components with labeled dimensions: flange and base plate.

Function and features 25
Functional overview 25
Mounting 27
Electrical connection 32
Programming 33
Controls and indicating elements 34
Menu structure 35
Installation and set-up / Operation 40
Technical data 41
Applications 42
Scale drawing 45

Important notes for the user of these instructions

• These operating instructions are a part of the product. Carefully read them before using the product.
• Keep the operating instructions for later use.
• Pass the operating instructions on to future owners or users of the product.
• Whenever you receive a supplement to these operating instructions enclose it to them.

Safety instructions

• The unit must be connected by a suitably qualified electrician.
• The national and international regulations for the installation of electrical equipment must be observed.
  • Voltage supply according to EN50178, SELV, PELV.
• The unit complies with the standard EN 50081-2 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.
• Improper use 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 only be carried out by qualified personnel authorised by the machine operator.

Function and features

Applications

LR70 is a compact level sensor for the detection of liquids. The unit was specially designed to meet the requirements of machine tool building. It is specially suited for monitoring coolant emulsions as well as aqueous cleaning agents in part cleaning systems.

Restriction of the application area

- Only use the unit in metal tanks.

Not suited for plastic tank covers.

• The unit is not suitable for oils, fats, granulates, bulk materials, acids, alkalis; it is not suitable for food and electroplating applications.
• Foam, separate layers (e.g. oil on water), highly absorbing or bubbling surfaces can lead to incorrect measurements or signal loss. Check the function by an application test.

In case of signal loss, the unit displays "Err1" and switches the outputs to a defined state →page 41, output response).

Functional overview

Measuring principle

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 probe (fig. 1). When they hit the medium to be detected they are reflected and guided back to the sensor (fig. 2). The time between transmitting and receiving the pulse directly relates to the travelled distance and the current level.

Diagram showing two mechanical or fluid system configurations with directional arrows and wave patterns, labeled 1 and 2.

The reference for distance measurement is the lower edge of the thread.

Functional overview

• The unit displays the current level and signals via two switching outputs that the set limits have been reached or that the level is below the set limit. The setpoint and reset point values and the switching function of the outputs can be set via the user menu. For each of the two switching outputs a switch-off delay (max. 5 s) can be set (e.g. for specially long pump cycles).
• The unit can be installed in tanks of different sizes. 3 probe lengths are available. To adapt to the tank height, it is also possible to shorten the probe. The unit can be set to the new probe length via the user menu.
• The zone between tank bottom and lower edge of the measuring probe can be entered as offset value (OFS). Thus display and switch points refer to the real level.
• The display unit can be set: cm or inch..
• The unit can be reset to the factory settings.
• The response of the outputs in case of a fault is adjustable. If a fault is detected or if the signal quality is below a minimum value, the outputs pass into the safe state (→page 37, parameters FOU1 and FOU2).
• Housing rotatable by 360^ for orientation after mounting.
• Probe rotatable by 360^ for easier mounting / removal of the probe.

To ensure the unit functions correctly, certain installation conditions must be adhered to.

Read the following chapter (mounting) carefully and follow the instructions.

Mounting

There are 3 mounting options:

1. Screw in a G ^3/4 process connection in the tank lid.
2. Installation in the tank lid using a flange plate (e.g. for tanks with thin walls).
3. Installation in an open tank using a fixture.

ATTENTION: In all cases the unit needs a metal surface to transfer the measured signals (transfer plate).

On 1 and 2:

For installation in closed metal tanks, the metal lid serves as a transfer plate (R).

Technical line drawing of a mechanical device with a base and mounting base, labeled 'R' (no text or symbols beyond label)

The lower edge of the thread should be flush with the mounting environment. Use seals or washers (D) to reach the required height.

When using the ifm flange plates ( page 31) flush installation is ensured.

Technical diagram of a mechanical device with labeled component R (no text or symbols beyond label)

Technical diagram showing two identical electrical components with labeled connection points and a cross symbol (no text or labels present)

On 3:

For installation in open metal tanks, the unit must be mounted using a metal fixture. It serves as a transfer plate (R). Minimum size: 150 x 150 mm for a square fixture, 150 mm diameter for a circular fixture. If possible, mount the unit in the middle of the fixture. The distance D2 must be min. 40 mm.

R D2 150 mm

Installation location / installation environment

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

B 50mm 100mm 40mm 10mm

• 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 installation in pipes the inside pipe diameter (d) must be min. 100 mm. Only use metal pipes.
• For installation in connection pieces the connection piece diameter (d) must be min. 50 mm. The height of the connection piece (h) must not exceed 40 mm.

d

d h

- The maximum level must not exceed the blocking distance (BD = 40 mm). If it is exceeded by more than 10 mm, measurement errors and error messages can occur. Arrange for a spout to avoid this problem.

BD

Adaptation of the probe

The sensors are supplied with probes in different lengths (L):

LR7022: L = 240 mm

LR7023: L = 450 mm

LR7024: L = 700 mm

The probes can be shortened to adapt to different tank heights. The minimum permissible probe length Lmin is 150 mm.

Lmin L

Proceed as follows:

1. Mark the desired length (L).
2. Unscrew the probe from the unit.
3. Shorten the probe. Ensure that the probe length is not below the minimum permissible length (15 cm / 6 inch).
4. Remove all burrs and sharp edges.
5. Screw the probe to the unit. Recommended tightening torque: 4 Nm.
6. Set the new probe length during set-up ( page 36, menu point: LEnG).

Notes:

Probes are also available as accessories: E43203 (240 mm), E43204 (450 mm), E43205 (700 mm).

Every LR70 type sensor can be combined with any of the indicated probes.

For ease of mounting and removal the probe can be rotated with respect to the thread (process connection) without restriction. Even if rotated several times by 360^ there is no risk of damage to the sensor.

Installation of the sensor using a flange plate

Technical diagram showing two mechanical components with labeled dimensions: flange and base plate.

- For installation of the unit you need a bore hole in the tank lid. The bore hole must have a minimum diameter (d) to enable sufficient transfer of the measured signal to the probe. The diameter depends on the wall thickness of the tank lid:

Wall thickness [mm] 1...5 5...8 8...11
Bore hole diameter [mm] 30 40 55

• The flange plate is mounted with the flat surface showing to the tank and fixed with screws. Place the sensor seal (A) and the adapter seal (B).
• After mounting, the sensor housing can be aligned. It can be rotated with respect to the thread (process connection) without restriction. Even if rotated several times by 360^ there is no risk of damage to the sensor.

The following flange plates are available as accessories:

Flange plate 73 - 90 / G ^3/4 , aluminium .... order no. E43201

Flange plate 65 - 80 / G ^3/4 , aluminium .... order no. E43202

They are suitable for a maximum tank pressure of 0.5 bar.

Electrical connection

The unit must be connected by a suitably qualified electrician. The national and international regulations for the installation of electrical equipment must be observed.

Voltage supply according to EN50178, SELV, PELV.

Disconnect power before connecting the unit as follows:

graph TD
    A["4: OUT1\n2: OUT2"] --> B["1"]
    A --> C["2"]
    A --> D["3"]
    A --> E["4"]
    A --> F["L+"]
    A --> G["L-"]

Pin / connection core coloursof ifm

1 brown

2 white2 (operating output)

3 blue

4 bOldF1 (operating output)

sockets

Programming

1	➡	Press the Mode/Enter button several times until the respective parameter is displayed.
2	➡	Press the Set button and keep it pressed. The current parameter value flashes for 5s, then the value is increased* (incremental by pressing briefly or scrolling by holding pressed).
3	➡	Press the Mode/Enter button briefly (= acknowledgement). The parameter is displayed again, the set parameter value becomes effective.
4	Change more parameters: Start again with step 1.	Finish programming: Wait for 15s or press the Mode/Enter button until the current measured value is indicated again.

*Decrease the value: Let the display of the parameter value move to the maximum setting value. Then the cycle starts again at the minimum setting value.

Timeout: If no button is pressed for 15s during the setting procedure, the unit returns to the Run mode with unchanged values.

Locking / Unlocking: The unit can be electronically locked to prevent unwanted adjustment of the set parameters: Press both pushbuttons for 10s (until Lio displayed). To unlock: Press both pushbuttons for 10s (until uLoc is displayed).

Units are delivered from the factory in the unlocked state.

With the unit in the locked state is indicated when you try to change parameter values.

The unit can be programmed before or after installation.

Controls and indicating elements

1 2 3 Mode/EnterSet 4 5

1	2 x LED green	Lighting LED = set display unit:- LED 1 = level in cm.- LED 2 = level in inch.
2	2 x LED yellow	Switching status indication; lights if the respective output is switched.- LED 1 = OUT1 (freely configurable output).- LED 2 = OUT2 (freely configurable output).
3	4-digit alphanumeric display	- Indication of the current level.- Operating and fault indication.- Indication of the parameters and parameter values.
4	Set pushbutton	- Setting of the parameter values (scrolling by holding pressed; incremental by pressing briefly).
5	Mode / Enter pushbutton	Selection of the parameters and menu points,acknowledgement of the parameter values.

Menu structure

graph TD
    A["80"] --> B["M"]
    B --> C["SP1 S M 100"]
    C --> D["M̄"]
    D --> E["rP1 S M 95"]
    E --> F["M̄"]
    F --> G["OU1 S M Hno"]
    G --> H["M̄"]
    H --> I["SP2 S M 200"]
    I --> J["M̄"]
    J --> K["rP2 S M 195"]
    K --> L["M̄"]
    L --> M["OU2 S M Hnc"]
    M --> N["M̄"]
    N --> O["OF5 S M 00"]
    O --> P["M̄"]
    P --> Q["EF S"]
    Q --> R["M̄"]
    R --> S["80"]

    T["dr1 S M 00"] --> U["M̄"]
    U --> V["dR2 S M 00"]
    V --> W["M̄"]
    W --> X["FOU1 S M OFF"]
    X --> Y["M̄"]
    Y --> Z["FOU2 S M OFF"]
    Z --> AA["M̄"]
    AA --> AB["Uπ1 S M cm"]
    AB --> AC["M̄"]
    AC --> AD["LEnG S M 240"]
    AD --> AE["M̄"]
    AE --> AF["rES S M ----"]
    AF --> AG["M̄"]

    subgraph Mode/EnterSet
        direction TB
        T
        U
        V
        W
        X
        Z
        AA
        AB
        AC
        AD
        AE
        AF
        AG
        AH["Mode/EnterSet"]
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
        mode
    end

For programming carry out the following steps in the indicated order.

		ParameterStep P
1 Access the extended functionsPress the Mode/Enter button until EF is displayed.Press the Set button. The first parameter of the extended menu is now displayed. You can access the corresponding parameter value by pressing the Set button again. Pressing the Mode/Enter button accesses the following parameters.		EF
2 Selection of the display unitSet the required display unit: cm / inch.Select the display unit before setting values for the parameters SPx, rPx, LEnG, OFS. This avoids rounding errors generated internally during the conversion of the units and enables exact setting of the values.Setting at the factory: Uni = cm.		Uni
3 Setting of the probe lengthThis setting is only necessary if the probe length differs from the delivered length.On delivery: LEnG = probe length L (see scale drawing page 41).Determine the actual probe length (measured from the lower edge of the thread to the probe end). Round this value to 5 mm / 0.2 inch.Activate the parameter LEnG. Enter the new value.For the setting range of the probe length please refer to the table on page 38		LEng
4 Setting of the offset valueThe zone between tank bottom and lower edge of the measuring probe can be entered as offset value (OFS). Thus display and switch points refer to the real level.Setting at the factory: OFS = 0.The setting values OFS are indicated in the table on page 38.Please note: Select OFS, before setting values for the parameters SPx, rPx and OP. This avoids inadvertent maladjustment.		OFS
5 Setting of the switching parametersSP1:setpoint 1 = upper limit value at which the switching output OUT1 changes its switching status.rP1:reset point 1 = lower limit value at which the switching output OUT1 changes its switching status.OU1:switching function for the switching output OU1.4 settings can be selected:hysteresis (H..) or window function (F..)as normally open (.no) or normally closed (.nc).		SP1r-P1OU1
	SP2:setpoint 2 = upper limit value at which the switching output OUT2 changes its switching status.rP2:reset point 2 = lower limit value at which the switching output OUT2 changes its switching status.OU2:switching function for the switching output OU2.4 settings can be selected:hysteresis (H..) or window function (F..)as normally open (.no) or normally closed (.nc).Setting ranges for SPx and rPx → page 38.Note:If the upper setpoint is used as an overflow protection, the setting OUx = Hnc (nc function) is recommended. The principle of normally closed operation ensures that wire break or cable break is also detected	SP2r-P2OU2
6 Setting of the switch-off delaydr1:switch-off delay for the switching output OUT1dr2:switch-off delay for the switching output OUT2• Setting range: 0...5 s in steps of 0.2 s.The switch-off delay is only effective when setting the switching function hysteresis (OUx = H..).		dr-1dr-2
7 Response of the outputs in case of a faultFOU1:Wrong response for the switching output OUT1FOU2:Wrong response for the switching output OUT22 settings can be selected:On= output switches ON in case of a fault.OFF= output switches OFF in case of a fault.Factory setting: FOU1 / FOU2 = OFF.Faults are: faulty hardware, too low a signal quality.Overflow is not considered to be a fault!		FOU1FOU2ENGLISH

Reset to factory settings

Resets all settings to the state on delivery. Before the factory reset check the possible effects on your application!

• Press the "Mode/Enter" button until rES is displayed
• Press the "Set" button and keep it pressed until "----" is displayed,
• Press the "Mode/Enter" button briefly. The display then returns to rES.

ParameterStep P

r-ES

Setting range for the probe length (applies to all LR70 type units)

	cm	inch
Setting range	15...70	6.0...27.6
in steps of	0.5	0.2

The probe can be replaced. Probes are available as accessories in different lengths.

Setting range for OFS (applies to all LR70 type units)

	cm	inch
Setting range	0...100	0...39.4
in steps of	0.5	0.2

Setting range for SPx, rPx

	LR7022 (L = 24)*cm inch	LR7023 (L = 45)*cm inch	LR7024 (L = 70)*cm inch
SPx	1.5...20.0 0.6...7.8	1.5...41.0 0.6...16.2	1.5...66.0 0.6...26.0
rPx	1.0...19.5 0.4...7.6	1.0...40.5 0.4...16.0	1.0...65.5 0.4...25.8
ΔL*	0.5 0.2	0.5 0.2	0.5 0.2

*L = probe length [cm] on delivery; ΔL = increments
The values apply to the probe length on delivery and OFS = 0.

• rPx is always smaller than SPx. Reducing the value for SPx to a value ≤ rPx also shifts the position of rPx.
• If the difference between rPx and SPx is small (approx. 3 x increment), increasing rPx also increases SPx.
• If the difference between rPx and SPx is great, rPx remains at the set value

Hysteresis function (Hno, Hnc) (fig. 1):

The hysteresis keeps the switching state of the output stable if the level of the medium varies about the preset value.

With the level rising, the output switches when the switch-on point has been reached (SPx). With the level falling, the output does not switch back until the level falls below the reset point rPx.

The hysteresis for SPx can be adjusted: First the switch-on point is set, then the switch-off point with the requested distance.

Window function (Fno, Fnc) (fig 2)

The window function enables the monitoring of a defined acceptable range. When the level of the medium varies between the switch-on point (SPx) and the switch-off point (rPx), the output is switched (window function / NO) or not switched (window function / NC).

The width of the window can be set by means of the difference between SPx and rPx. SPx = upper value, rPx = lower value.

L = level

Installation and set-up / Operation

After mounting, wiring and programming check whether the unit operates correctly.

Operating and fault indication:

CAL	Initialisation after power on.
XX.X	Level indication.
----	During operation: level below the active zone.During programming: Feedback during factory reset: all parameters reset to factory setting".
FULLXX.X	Maximum measuring range is reached or exceeded."FULL" and the indication of the maximum level alternate every second (= warning overflow).
Loc	Unit electronically locked, programming not possible.For unlocking press the two programming buttons for 10 s.
uLoc	Feedback: unit is unlocked / programming is possible again.
Err0	Fault in the electronics (the unit must be replaced).
Err1	- Measured signal below the safe evaluation range. Clean the probe and the process connection. Check mounting (the minimum distances may not have been adhered to).- The level exceeded the block distance by more than 10 mm.Reduce the level, attach a spout if possible.- The level reaches the state "empty" or "full" more quickly than allowed (plausibility check). Possible causes: cleaning or maintenance of the probe or tank, contact with the probe when switched on.
SC1, SC2	Flashing: short circuit in the switching output 1, 2.
SC	Flashing: short circuit in both switching outputs.

Carry out a reset (power off and on again) after rectifying the fault and to reset the error message.

Read the set parameter values:

- The parameter names are scrolled with each pressing of the "Mode/Enter" button.

- When the "Set" button is pressed briefly, the corresponding parameter value is displayed for 15s.

Output response in different operating states

	OUT1	OUT2
Initialisation	OFF	OFF
Normal operating	according to the level and OU1 setting	according to the level and OU2 setting
Fault (Err0, Err1)	OFF for FOU1=OFFON for FOU1=On	OFF for FOU2=OFFON for FOU2=On

Technical data

Operating voltage [V] ..... 18 ... 30 DCCurrent rating [mA] ..... 200Short-circuit protection; reverse polarity protection / overload protectionVoltage drop [V] ..... < 2.5Current consumption [mA] ..... < 80Accuracy of switch point [% of the final value of the measuring range] ± 5Repeatability [% of the final value of the measuring range] ..... ± 2Maximum speed of the change of level [mm/s] ..... 100Dielectric constant medium ..... > 20Maximum tank pressure [bar] ..... 0.5

Housing material . stainless steel (304S15); FKM; NBR; PBT; PC; PEI; TPE/V; PTFEMaterials (wetted parts) ..... stainless steel (303S22); PTFE; NBRProtection ..... IP 67, IIIOperating temperature [°C] ..... 0...60Medium temperature [°C] ..... 0...80Storage temperature [°C] ..... -25...80Storage temperature [°C] ..... -25 ... 80Shock resistance [g] ..... 12 (DIN EN 60068-2-29, 11 ms)Vibration resistance [g] ..... 2.5 (RMS, 1...1000 Hz)EMC EN 61000/4/2 ESD: ..... 4/8 kVEN 61000/4/3 HF radiated: ..... 10 V/mEN 61000/4/4 Burst: ..... 2 kVEN 61000/4/6 HF conducted: ..... 10 V

Applications

Minimum level monitoring with prewarning and alarm

Switching output 1: prewarning
SP1	slightly above rP1 (to suppress wave movements)
r-P1	below preset level →prewarning, start refilling
OU1	hysteresis function, normally closed (Hnc)

Switching output 2: alarm
SP2	min. value reached again →alarm reset
r-P2	below min. value →alarm
OU2	hysteresis function, normally open (Hno)

• If the level is below rP1, output 1 switches until liquid is refilled. If SP1 is reached again, output 1 switches back.
• If the level is above SP2, output 2 switches. If the level falls below rP2 or if there is a wire break, output 2 switches back.
• By setting SP1 the maximum level can be controlled/monitored: The value of SP1 determines up to which level (max) is to be refilled. When the maximum level is reached, this is signalled by the LED OUT1 going out and output 1s witching off.

Applications

Pumping station

Empty the vessel with overflow protection

Switching output 1: control to empty vessel
SP I	upper value exceeded →submersible pump ON
r-P I	lower value reached →submersible pump OFF
OU I	hysteresis function, normally open (Hno)

Switching output 2: overflow protection
SP2	maximum value exceeded →alarm
r-P2	slightly below SP2 (to suppress wave movements)
OU2	hysteresis function, normally closed (Hnc)

• If SP1 is exceeded, output 1 switches (submersible pump ON). When the level is below rP1 again the output switches back (submersible pump OFF).
• If SP2 is exceeded or if there is a wire break, output 2 switches off.

Applications

Storage vessel

Monitoring of the acceptable range (alarm) and level control

Switching output 1: refilling
SP I	upper preset value reached →finish refilling
r-P I	below lower preset value →start refilling
OU I	hysteresis function, normally closed (Hnc)

Switching output 2: safety function min - max
SP2	max. value exceeded →alarm
r-P2	below min. value →alarm
OU2	window function, normally open (Fno)

• If the level is below rP1, output 1 switches until liquid is refilled. If SP1 is reached again, output 1 switches back.
• If the level is below rP2 or above SP2 or if there is a wire break, output 2 switches OFF (→alarm).
• The logical operation between the outputs 1 and 2 indicates whether there is overflow or the actual level is below the minimum level.

- Overflow: output 1 and output 2 switched off.

- Below min. value: output 1 switched on and output 2 switched off.

Scale drawing

Ø50 1 2 3 57 67 78 L A 12

63 30 M12x1 Ø32 Ø6 Ø8 G3/4

	LR7022 LR7023 LR7024
	cm inch	cm inch	cm inch
L = probe length	24 9.5	45 17.7	70 27.6
A = active zone	19 7.5	40 15.8	65 25.6
I_1 (inactive zone 1)	4 1.6 4 1.6 4	1.6
I_2 (inactive zone 2)	1 0.4 1 0.4 1	0.4
1	4-digit alphanumeric display
2	LEDs
3	Programming buttons

ENGLISH

Contenue

Diagram of a vertical device with directional arrows indicating flow or movement, no text or symbols present

2 D

Technical line drawing of a mechanical device with a base and mounting base, labeled 'R' (no text or symbols beyond label)

Technical line drawing of a mechanical device with labeled component R (no text or symbols beyond label)

Two technical diagrams showing a device with labeled component D and no visible text or symbols

Concernant 3 :

B 50mm 100mm 40mm 10mm

Technical diagram showing two mechanical components with labeled parts A and B, including a flange and dimensional annotation d.

Broche / raccordement

1 brun