LDL101 - Conductivity sensor IFM - Free user manual and instructions

USER MANUAL LDL101 IFM

Operating instructions

Conductive conductivity sensor for UPW hygienic G1/2

LDL101

Contents

1 Preliminary note 3

1.1 Symbols used 3
1.2 Warnings.... 3

2 Safety instructions.... 4

3 Intended use.... 5

3.1 Application area 5
3.2 Restriction of the application area 5

4 Function 6

4.1 Measuring principle.... 6
4.2 Analogue function 6
4.3 Defined state in case of a fault 7
4.4 IO-Link 7

5 Installation.... 8

5.1 Installation location / environment 8

5.1.1 Installation in pipes 9

5.2 Installation procedure 9
5.3 Installation procedure of the adapter 9
5.4 Installation procedure of the sensor 10
5.5 Notes on the use according to EHEDG 10
5.6 Notes on the use according to 3-A® 11

6 Electrical connection.... 12

6.1 For the cULus scope of validity 12

7 Parameter setting 13

7.1 Parameter setting during operation 13
7.2 Adjustable parameters 13

7.2.1 Basic settings 13
7.2.2 More settings 14
7.2.3 Example parameter setting 15

7.3 Temperature influence and temperature coefficient 15

7.3.1 Influence of the medium on the temperature.... 15
7.4 Determination of the temperature coefficient tempco 15

8 Operation 16

8.1 Function check 16
8.2 Operating and diagnostic messages via IO-Link 16
8.3 Output response in different operating states 16

9 Maintenance, repair, transport and disposal 17

Factory setting 18

1 Preliminary note

You will find instructions, technical data, approvals and further information using the QR code on the unit / packaging or at documentation.ifm.com.

1.1 Symbols used

√ Requirement
Instructions
Reaction, result

[...] Designation of keys, buttons or indications

→ Cross-reference

Important note

Non-compliance may result in malfunction or interference.

Information

Supplementary note

1.2 Warnings

Warnings indicate the possibility of personal injury and damage to property. This enables safe product handling. Warnings are graded as follows:

WARNING

Warning of serious personal injury

▷ If the warning is not observed, fatal and serious injuries are possible.

CAUTION

Warning of minor to moderate personal injury

▷ If the warning is not observed, minor to moderate injuries are possible.

ATTENTION

Warning of damage to property

▷ If the warning is not observed, damage to property is possible.

2 Safety instructions

- The unit described is a subcomponent for integration into a system.

• The system architect is responsible for the safety of the system.

• The system architect undertakes to perform a risk assessment and to create documentation in accordance with legal and normative requirements to be provided to the operator and user of the system. This documentation must contain all necessary information and safety instructions for the operator, the user and, if applicable, for any service personnel authorised by the architect of the system.

• Read this document before setting up the product and keep it during the entire service life.

• The product must be suitable for the corresponding applications and environmental conditions without any restrictions.
• Only use the product for its intended purpose (→ Intended use).
• If the operating instructions or the technical data are not adhered to, personal injury and/or damage to property may occur.
• The manufacturer assumes no liability or warranty for any consequences caused by tampering with the product or incorrect use by the operator.
• Installation, electrical connection, set-up, operation and maintenance of the product must be carried out by qualified personnel authorised by the machine operator.
• Protect units and cables against damage.
• Only use the product for permissible media (→ Technical data).
• The unit complies with the standard EN 61000-6-4 and is a class A product. The unit may cause radio interference in domestic areas. If interference occurs, the user must take appropriate actions.

3 Intended use

The device measures the conductivity and temperature of purified and highly purified water, e.g. in water treatment plants for the beverage or pharmaceutical industry. The unit is designed for direct contact with the medium.

3.1 Application area

• Purified and highly purified water applications.
• Electrically hardly conductive media ( → Technical data sheet).

Application examples:

• Ion exchanger
• Reverse osmosis
  • Distillation monitoring
  • Water for injection (WFI)
  • Semiconductor production
  • Production of solar modules (surface cleaning)
• Desalination plants

3.2 Restriction of the application area

• Use the unit only for media to which the wetted materials are sufficiently resistant ( → Technical data sheet).
• The unit is not suitable for liquids with a medium to high electrical conductivity (e.g. industrial water, wastewater, sea water, acids, alkalis).
• The unit is not suitable for applications where the probe is subjected to permanent and high mechanical stress (e.g. abrasive media or fast flowing media containing solid particles).
  • Not suited for media prone to formation of deposit.
• Do not expose the probe tip to direct sun radiation (UV radiation).

4 Function

4.1 Measuring principle

Fig. 1: Sectional view of measuring element

1: Outer electrode
2: Inner electrode
3: Mounting adapters

The unit operates on the conductive measuring principle. It measures the electrical conductivity of the medium to be monitored by means of a current flow between the inner electrode and the outer electrode.

The sensor head must be in contact with the process liquid from the sensor tip to the mounting adapter. Otherwise there is no electrical connection so that no measurement can be made.

To compensate the influence of the temperature, the process temperature is detected by a temperature probe in the sensor tip.

4.2 Analogue function

The unit provides an analogue signal proportional to the conductivity or (as option) the temperature. The analogue output (OUT2) can be configured.

Curve of the analogue signal (factory setting):

Curve of the analogue signal (measuring range scaled):

L: conductivity:
T: temperature
1: [ou2] = [l]
2: [ou2] = [InEG]
ASP2: analogue start point
AEP2: analogue end point

4.3 Defined state in case of a fault

If a fault is detected or if the signal quality is below a minimum value, the output OUT2 passes into a defined state according to Namur recommendation (NE43).

For this case, the response of the output can be set via the parameter [FOU2].

4.4 IO-Link

IO-Link is a communication system for connecting intelligent sensors and actuators to automation systems. IO-Link is standardised in the IEC 61131-9 standard.

General information on IO-Link at io-link.ifm

Input Output Device Description (IODD) with all parameters, process data and detailed descriptions of the device at documentation.ifm.com

IO-Link offers the following advantages:

• Interference-free transmission of all data and process values
• Parameter setting in the running process or presetting outside the application
- Parameters for identifying the connected devices in the system
• Additional parameters and diagnostic functions
• Automatic backup and restore of parameter sets in case of device replacement (data storage)
- Logging of parameter sets, process values and events
• Device description file (IODD - Input Output Device Description) for easy project planning
• Standardised electrical connection
- Remote maintenance

5 Installation

CAUTION

If the medium temperature is above 50\ °C ( 122\ °F ) parts of the housing can increase in temperature to over 65\ °C ( 149\ °F ).

▷ Risk of burns
▶ Do not touch the unit.
▶ Protect the housing against contact with flammable substances and unintentional contact.
▶ Allow the unit and process adapter to cool down before maintenance.

Before installing and removing the unit:

▶ Make sure that no pressure is applied to the system and there is no medium in the pipe or tank. Also always take into account the potential dangers related to extreme machine and medium temperatures.

The sensor is supplied without installation / connection accessories.

Only use accessories from ifm electronic gmbh! The optimum function is not ensured when using components from other manufacturers.

Available accessories: www.ifm.com.

Before using the sensor for the first time, it must be cleaned with an appropriate cleaning agent that is approved for the application.

5.1 Installation location / environment

A correct fit and function of the unit and ingress resistance of the connection are only ensured using ifm adapters.

▶ Observe the following for applications in hygienic areas: Notes on the use according to EHEDG, Notes on the use according to 3-A® (→ ☐ 11).

For installation in tanks and pipes:

▶ Install the unit (in particular in horizontal pipes) laterally or at an angle of max. 45° to the horizontal.

▷ Avoidance of influence by air bubbles and deposits.

5.1.1 Installation in pipes

1: Measuring element
2: Pipe

▶ Sensor and measuring element (1) must completely reach into the pipe (2).
▷ Unhindered flow through the measuring element is ensured.

▶ Avoid installation in a clamp adapter as this does not guarantee optimum flow through the measuring element. If installation in a clamp adapter cannot be avoided: adhere to the dimensions, see: Notes on the use according to EHEDG ( → ☐ 10)
▶ Installation preferably before or in rising pipes.
▶ Provide for inlet and outlet pipe lengths (2) (minimum 3 x DN, optimum 5 x DN).
▷ Disturbances caused by bends, valves or pipe reductions, etc. are then eliminated.

S: Interference
DN: Pipe diameter
1: Sensor
2: Inlet and outlet pipe lengths

5.2 Installation procedure

The unit is installed by means of a G 1/2 adapter ( → Accessories).

5.3 Installation procedure of the adapter

▶ Observe the operating instructions of the adapter used.
▶ Ensure cleanliness of the sealing areas.
▶ Remove protective packaging only just before mounting.
▶ In case of damaged sealing areas replace the unit or the adapter.
▶ Weld or screw the adapter into the tank / pipe. For welding adapters make sure that the adapter does not warp during the welding process.

With clamp adapters etc. the order of the installation steps differs. Observe the notes in the installation instructions of the respective adapter.

5.4 Installation procedure of the sensor

▶ Slide the supplied seal (gasket) (1) over the thread onto the sensor or check for correct position if it is already mounted.
▷ It seals the gap on the back between the sensor and the adapter.

1: Rear seal (gasket).
2: Sealing cone / sealing PEEK on metal* or metal-to-metal.

* The unit can be used with or without a PEEK sealing ring (pre-mounted on the sealing cone (2)).

For applications in hygienic areas to EHEDG or 3A:

▶ Ensure that the PEEK sealing ring is mounted on the sealing cone (2).

▶ Lightly grease the thread of the sensor using a lubricating paste which is suitable and approved for the application.
▶ Screw the sensor into the respective process connection and tighten it. Tightening torque: 20 Nm
▶ After installation check the tank / pipe for ingress resistance.

5.5 Notes on the use according to EHEDG

In case welded adapters are used, the food contact surface must be smooth (surface roughness Ra < 0.8 μm) and the welding has to be done according to EHEDG Guideline 9 and 35.
The device is suited for CIP (cleaning in process) when installed correctly.

▶ Observe the application limits (temperature and material resistance) according to the data sheet.

▶ Ensure that the installation of the device in the system complies with EHEDG guidelines.
▶ Use self-draining installation.
▶ Only use process adapters permitted according to EHEDG with special seals required by the EHEDG position paper.
▶ When mounted in a tank, the installation must be flush mount. If not possible then direct water jet cleaning and cleaning of dead spaces must be possible.
▶ Leakage ports must be clearly visible and must be installed facing downwards for vertical pipes.

1: Leakage port
2: Seal

▶ To avoid dead space adhere to the dimensions: L < (D - d).

5.6 Notes on the use according to 3-A®

▶ Make sure that the sensor is integrated into the system according to 3-A.
▶ Use only adapters with 3-A qualification and marked with the 3-A symbol. Available accessories: www.ifm.com.

The process connection must be provided with a leakage port. This is ensured when installed using adapters with 3-A approval.

▶ Leakage ports must be clearly visible and must be installed facing downwards for vertical pipes.

For use according to 3-A, special regulations apply for cleaning and maintenance.
Not suitable for systems that have to meet the criteria of E9.2 of the 3A standard 63-04.

6 Electrical connection

The unit must be connected by a qualified electrician.

The national and international regulations for the installation of electrical equipment must be adhered to.

Supply voltage to EN 50178, SELV, PELV according to the technical data sheet.

▶ Disconnect power.
▶ Connect the unit as follows:

Pin	Core colour
1:	BN	brown
2:	WH	white
3:	BU	blue
4:	BK	black
OUT1:• IO-Link
OUT2:• analogue output
Colours to DIN EN 60947-5-2

6.1 For the cULus scope of validity

The electrical supply must only be made via SELV/PELV circuits.

A class 2 power supply can also be used and is not excluded.

The device must be supplied via a limited energy circuit according to section 9.4 of UL standard 61010-1, 3rd issue, or equivalent.

The external circuits connected to the device must be SELV/PELV circuits.

The device is designed to be safe at least under the following conditions:

• Indoor use
  • Altitude up to 2000 m
  • Relative air humidity up to max. 90%, non condensing
• Pollution degree 3
• Use UL-certified approved cables of category PVVA or CYJV with data suitable for the application.
  • No special treatment is needed for cleaning the device.

7 Parameter setting

Parameters can be set before installation or during operation.

If you change parameters during operation, this will influence the function of the plant.

▶ Ensure that there will be no malfunctions in your plant.

During parameter setting the unit remains in the operating mode. It continues to monitor with the existing parameter until the parameter setting has been completed.

Depending on the parameter setting, the parameters available in the menu may change.

Requirements for parameter setting via the IO-Link interface:

√ A suitable parameter setting software, e.g. ifm moneo|configure
√ The Input Output Device Description (IODD) for the device, see documentation.ifm.com
√ One IO-Link master

▶ Connect the IO-Link master to a parameter setting software.

▶ Set the port of the master to the IO-Link operating mode.

▶ Connect the device to a free port of the IO-Link master.

▷ The unit switches to IO-Link mode.

▶ Change parameter settings in the software.

▶ Write parameter settings to the unit.

Notes on parameter setting → Manual of the parameter setting software

7.1 Parameter setting during operation

Parameter setting during operation is only possible with an IO-Link-capable module (master).

Setting parameters can be directly adjusted via the controller.

Example: Media-specific parameters such as temperature coefficient [T. Cmp] can be adjusted to improve accuracy.

Recipes and settings can be stored in the controller during operation.

By parameter setting via the controller, a check of the units via a bit in parameter setting is ensured.

7.2 Adjustable parameters

7.2.1 Basic settings

Reset to factory settings	Restore the factory settings (button to activate the system command)
rEF. T	Standard temperature (25 °C) = reference temperature for measuring the conductivity. The standard temperature can be adjusted by the user, if necessary. Setting range: 15...35 °C
T. Cmp	Temperature compensation. The conductivity is determined according to the standard temperature ([rEF. T]) when the temperature coefficient (medium-specific characteristic value) is entered. Setting range: 0...5 %
T. Cmp	! The temperature compensation is freely adjustable over 10 μS/cm in the corresponding value range and is linear. Temperature compensation below 10 μS/cm is non-linear according to ASTM D 1125. If the parameter T. Cmp = 0 is set, the temperature compensation is switched off.
uni. T	Selection of temperature unit[°C] = temperature is displayed in °C (degrees Celsius)[°F] = temperature is displayed in °F (degrees Fahrenheit)
CGA	Calibration gain (cell constant correction factor)With this factor the sensor can be adapted to a present system, or optimised to a certain conductivity value, or corrected. Setting range: 80...120 %.

7.2.2 More settings

ou2	Output configuration for the analogue output (OUT2): [I] = measuring range is provided as 4...20 mA: [InEG] = measuring range is provided as 20...4 mA [OFF] = output OFF (high impedance)*
SEL2	Assignment of the analogue output to the process value: [COND] = conductivity [TEMP] = Temperature
ASP2-TEMP	Analogue start point temperature; Setting range: -25...115 °C. Distance to AEP2-TEMP: min. 35 °C
AEP2-TEMP	Analogue end point temperature; Setting range: 10...150 °C. Distance to ASP2-TEMP: min. 35 °C
Offset TEMP	Zero-point calibration (calibration offset) / temperature; Setting range: +/- 5 K
ASP2-COND	Analogue start point conductivity; Setting range: 0...500 μS/cm. Distance to AEP2-COND: ASP2-COND must not be higher than 50 % AEP2-COND.
AEP2-COND	Analogue end point conductivity; Setting range: 1...1000 μS/cm. Distance to ASP2-COND: AEP2-COND must be at least two times ASP2-COND.
Lo. T	Minimum value memory for the temperature
Hi. T	Maximum value memory for the temperature
Reset [Hi. T] and [Lo. T]	Reset maximum and minimum value memory (button to activate the system command)
Lo. C	Minimum value memory for conductivity
Hi. C	Maximum value memory for conductivity
Reset [Hi. C] and [Lo. C]	Reset maximum and minimum value memory (button to activate the system command)
FOU2	Response of OUT2 in case of a fault: [OU] = analogue output reacts according to process value, if possible. Otherwise: Analogue output goes to [OFF]. [On] = analogue output switches to value >21 mA in case of a fault [OFF] = analogue output switches to value < 3.6 mA in case of a fault
dAP	Damping of the measured signal. Setting range: 0...20 s
S. Tim	Simulation; entering the simulation time Setting range: 1...60 min
S. On	Simulation; Status of the simulation: [OFF] = simulation OFF [On] = simulation ON
Start simulation	Start simulation (button to activate the system command)
Stop simulation	Stop simulation (button to activate the system command)
S. TMP	Simulation; selection of the temperature value to be simulated Setting range: -35...160 °C
S. CND	Simulation; selection of the conductivity value to be simulated Setting range: 0... 3150 μS/cm
Device temperature	Current temperature of the device Measuring range: -40...110 °C

For further information, please refer to the IODD description (www.ifm.com) or to the context-specific parameter descriptions of the used parameter setting software.

7.2.3 Example parameter setting

▶ Set the temperature compensation (parameter [T. Cmp]) to a medium with the temperature coefficient 3.0 %/K. Example: [T. Cmp] = [3.0].
▶ Make all other settings.
▶ Transfer the sensor data to the unit.

7.3 Temperature influence and temperature coefficient

7.3.1 Influence of the medium on the temperature

The conductivity depends on the temperature. When the temperature increases, the conductivity changes. This temperature influence depends on the respective medium and can be compensated by the unit if the temperature coefficient (tempco) of the medium is known. The temperature compensation is set via the parameter [T. Cmp]. Then the temperature-compensated conductivity value corresponds to the conductivity at standard temperature (25 °C; factory setting of the parameter [rEF. T]).

For medium that is not changed the same tempco value has to be set for all sensors (unit-independent characteristic value). There is no further dependence on the measuring principle, the lot or the manufacturer of the sensors.

If the temperature coefficient of the medium is not known, it can be determined. See: Determination of the temperature coefficient tempco ( → ☐ 15)

In an IO-Link environment, existing tempcos of the media can be stored as recipe in the controller so that the accuracy of the values to be detected is improved.

7.4 Determination of the temperature coefficient tempco

1. Set the parameters [T. Cmp] and [dAP] to zero: [T. Cmp] = [0], [dAP] = [0].

▶ Write the changed values to the sensor.

1. Adjust the medium to 25° C, for example, and take down the value of the conductivity after 2 min.

2. Heat up the medium to 45° C, for example, and take down the value of the conductivity after 2 min.

Example of values taken down:

Medium at 25° C = 500 µ S/cm; medium at 45° C = 800 µ S/cm

Temperature change = 20 K

1. Calculate the change of the conductivity in percent. The conductivity has increased by 300 µ S/cm. The percentage change is 300/500 = 60 %.

2. Calculate the temperature coefficient tempco: The tempco is calculated from the change in percent and the temperature change: Tk = 60% / 20 K = 3% / K

3. The calculated tempco can now be adopted into the parameter [T. Cmp]. Example: [T.Cmp] = [3] . If necessary, set the damping (parameter [dAP]) again.

▶ Write values to the sensor.

8 Operation

8.1 Function check

After power-on the device is in the operating mode. It carries out its measurement and evaluation functions and generates process data (via IO-Link) according to the set parameters.

▶ Check whether the unit operates correctly.

8.2 Operating and diagnostic messages via IO-Link

IODD and IODD descriptive text as a PDF file at: www.ifm.com

8.3 Output response in different operating states

	OUT1 *)	OUT2
Initialisation	process value invalid	OFF
Normal operation	process value according to conductivity / temperature	according to conductivity / temperature and setting [ou2]
Fault	process value invalid	< 3.6 mA at [FOU2] = [OFF]> 21 mA at [FOU2] = [On]no change at [FOU2] = [OU]

*) process value via IO-Link

9 Maintenance, repair, transport and disposal

▶ Avoid the formation of deposits and soiling at the sensor element.
▶ To avoid damage to the sensor, no hard or sharp objects must be used when cleaning the sensor manually.
When the medium is changed, it may also be necessary to adapt the unit settings for a higher accuracy (parameter [T. Cmp]).
▶ It is not possible to repair the unit.
▶ After use, dispose of the unit in an environmentally friendly way in accordance with the applicable national regulations.
▶ In case of return shipment, ensure that the unit is free from soiling, especially from dangerous and toxic substances.
▶ For transport only use appropriate packaging to avoid damage of the unit.

10 Factory setting

	Factory setting	User settings
rEF. T	25 (°C)
T. Cmp	2 (%)
uni. T	°C
CGA	100 (%)
ou2	I
SEL2	COND (conductivity)
ASP2-TEMP	0 (°C)
AEP2-TEMP	150 (°C)
Offset TEMP	0 (K)
ASP2-COND	0 (μS/cm)
AEP2-COND	1000 (μS/cm)
Lo. T	---
Hi. T	---
Lo. C	---
Hi. C	---
FOU2	OFF
dAP	1 (s)
S. Tim	3 min
S. On	OFF
S. TMP	20 (°C)
S. CND	0.5 (μS/cm)