KROHNE SWSILBT01 User Manual

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Data sheet

Liquid Level Switch Type LLS 4000/4000U

The LLS 4000/4000U liquid level switch is designed to detect the state (gas or liquid) of the refrigerant in front of the sensing head, while installed in a wide range of refrigeration applications.

The LLS level switch comes in 2 variants, LLS 4000 and LLS 4000U. They are identical except for the connector thread interface to the system. The LLS 4000 is provided with G3/4" thread, while the LLS 4000U is provided with NPT 3/4" thread.

The LLS 4000/4000U liquid level switch is based on the proven reflectometry measuring technology(microwave level measurement) adapted specifically for the new LLS 4000/4000U switch.

LLS 4000/4000U liquid level switches can be used to control the liquid level of many different refrigerants in vessels, accumulators, receivers, standpipes, etc. The switches are normally installed in a pair of two, controlling the upper liquid level and the lower liquid level.

The level switch includes a relay that switches by change in refrigerant state. The on site configuration of the LLS allows the normally open/closed relay setting depending on the desired correlation.

Features

• Plug and play liquid level switch

• Easy installation and minimum or no need for configuration

• Convenient communication with all units via Bluetooth and a Danfoss app

• SIL2 compliant version

• 2 commonly used connection variants

• Maintenance free

• Replacement of electronic part without removing mechanical part (no opening to refrigerant)

• Applicable for ammonia and commonly used H(C)FCs

• Well proven reflectometry measuring principle

For SIL applications a SIL2 version is available with blocked configuration (not configurable).

All configuration and readings from the LLS switch are performed through Bluetooth and a downloadable special Danfoss app.

• Approvals: CE, PED, EMC, RED, ROHS, SIL2, FCC, ( EAC, IC pending)

• Conforms to: Telecommunications Directive RED 2014/53/EU. Low voltage directive 2014/35/EU. EMC directive 2014/30/EU.

ROHS 2011/65/EU

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Contents

Data sheet | Liquid Level Switch, type LLS 4000/4000U

Features .............................................................................. 1

uct concept/applications ........................................................... 3

Prod

Connection types ...................................................................... 4

Measuring principle..................................................................... 4

ctrical installation/connection......................................................... 5

LED light indicators .................................................................... 5

Configurable parameters .... .. ..... .. ..... ... ..

Ordering ................

Dimensions and weights .................................................................7

Maintenance/service & calibration precautions............... ............................. 8

Bluetooth communication .............................................................. 8

Bluetooth configuration ................................................................ 9

Technical data .................................

Safety/ Approvals .......................................................................11

.. ... ..... ... .. .. ... ..... .. ... . 5

..... ... .... .. .... ... ..... ... .... ... ..... .. ..... .. ... 7

........................................10

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Product concept/

Data sheet | Liquid Level Switch, type LLS 4000/4000U

applications

To control if a liquid level is within predened allowed limits, two LLS 4000 are installed in an upper and a lower limit position respectively. By this setup the liquid level is between the two level switches and the lower switch will sense liquid, while the upper will sense gas.

In case the liquid level moves outside the limits, one of the switches will sense opposite and switch the built-in relay. This relay switch function should be used for alarm settings. This is made easy when connected to the system PLC.

SFA

+DSV

FIA

SNV

SCA-X

SVA

SNV

260A

SNV

SVA

BSV

LLG

LLS 4000

SVA

AKS 4100

LLG

SCA-X

SNV

SVA

260A

EKE

347

ICF 25-6-5A

SVA

SNV

SVA

BSV

SNV

SVA

QDV

FIA

SNV

The LLS can be used wherever liquid levels of ammonia and certain H(C)FC refrigerants must be controlled.

Upper LLS 4000/U

Lower LLS 4000/U

The LLS comes in 2 versions:

- A standard version, which is applicable for most refrigeration or processing plants, and is fully configurable regarding type of liquid and relay setting.

- A SIL2 version applicable for SIL compliant process plants. This version is non-configurable regarding relay setting (see section: Configurable parameters) and is intended specific as the upper level switch.

Liq. Level

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Data sheet | Liquid Level Switch, type LLS 4000/4000U

Connection types

Beside the 2 versions the LLS also comes with 2 different thread types , LLS 4000 and LLS 4000U. They are identical except for the connector thread for installation to the system. The LLS

4000 is provided with G¾" thread, while the LLS 4000U is provided with NPT ¾" thread.

LLS 4000

LLS 4000U

G ¾”

NPT ¾”

For connection to the actual part of the system appropriate weld connectors are needed. NPT connectors are widespread available, while Danfoss offers weld connectors for G3/4" thread as accessory. Please note geometric restrictions below.

Weld connector

max

45 mm

1.8 in

min

25 mm

1 in

Measuring principle

The measurement principle of the LLS is based on reflectometry with a 4.9 GHz to 6.2 GHz linear sweep (Microwave switch technology).

The reflected signal is characterized by a resonance frequency. The resonance frequency in air is taken as a reference (fref). When the

sensing element is in contact with the liquid, the resonance frequency is shifting to a lower frequency. This is due to the change of the dielectric constant of the medium.

4.9 GHz 6,2GHz

with

liquid

The point level switch monitors the resonance frequency and indicates whether the sensing

element is surrounded by liquid or gas. The figure below shows the reference frequency with air (dielectric constant εr=1) in front of the sensing element and with a liquid dielectric constant εr> 1.35.

∆f ~ ε

without

liquid

ref

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Data sheet | Liquid Level Switch, type LLS 4000/4000U

+ Red

- White

Green

Black

Relay: 30 V DC

200 mA

24 V DC

+/- 25%

Electrical installation/ connection

The LLS 4000 level switch must be installed as one unit (mechanical and electrical assembled) without disassembly to avoid the need for recalibration.

For powering the device, a low power source (LPS) must be used with safety extra low voltage output (SELV) and current limited to 8A maximum

After connecting the M12 female cable to the power supply and relay circuit the M12 plug can be installed on the M12 male connector and the power can be switched on.

At this stage the green light LED will turn on and be visible through the transparent housing.

The LLS is now ready for configuration via the Danfoss Bluetooth app (see section: Configurable

parameters).

Danfoss M12 cables (ordered separately) M12 cable female x 2 meter M12 cable female x 8 meter

LED light indicators

Configurable parameters

Red light LED

Yellow light LED

Green light LED

There are 3 LED indicators inside the LLS 4000 behind the transparent cover.

• Green indicates the state of power to the switch.

 If flashing: Bluetooth connection is

established

• Yellow indicates if liquid is in front of switch.

• Red indicates if alarm is present.

The set-up of the LLS 4000 is easy and simple, since only few parameters in the LLS software are configurable. These are:

Green

Black

Relay: 30 V DC

200 mA

- White

24 V DC

+/- 25%

+ Red

For plants where factory defaults are valid, the installation and set-up is simply Plug & play.

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• Media type - Ammonia or Freon (H(C)FC). Factory default: Ammonia

• Relay NO (normally open) or NC (normally closed) Factory default: Normally closed

Below table shows possible configurations, relay state for given configuration/liquid level and LED indications

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Data sheet | Liquid Level Switch, type LLS 4000/4000U

High Level sensor

High Level

sensor

Low Level

sensor

Low Level

sensor

Level

LLS

4000/4000U

NO mode*

LLS

4000/4000U

NC mode*

SIL2 ﬁxed conﬁgura

tion

Voltage connected

Green LED Yellow LED Red LED

Level detection

LLS Fault

Voltage supply outside spec.

LLS 4000/4000U fault**

* Conﬁguration dependent. Non-SIL2 fully conﬁgurable. SIL2 ﬁxed conﬁguration and only applicable for High Level sensor ** For complete list of failure types refer to failure type section *** Fault can be detected at any detected level, ie. 2 or all 3 lights on

–

***

–

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Data sheet | Liquid Level Switch, type LLS 4000/4000U

Ordering

LLS 4000/4000U

Description Code Number

LLS 4000 liquid level switch (excl. welding connector & M12 cable) G 3/4"

LLS 4000 SIL2 liquid level switch (excl. welding connector & M12 cable) G 3/4"

LLS 4000U liquid level switch (excl. welding connector & M12 cable) NPT 3/4"

LLS 4000U SIL2 liquid level switch (excl. welding connector & M12 cable) NPT 3/4"

Spare parts/Accessories

Description Code Number

Weld connector 3/4”G

LLS 4000/U Electronic top part, non SIL2

M12 Danfoss female cable, 2 meter (6.6 ft) 034G7073

M12 Danfoss female cable, 8 meter (26.2 ft) 034G7074

LLS 4000/U Inspection sealing kit

84H6001

84H6002

84H6003

84H6004

084H6012

084H601

84H6011

Dimensions and weights

LLS 4000

19,5

LLS 4000U

0.6

20 15

G3/4

H32

142,4

(mm)

5.6

71,3 2

M12x1

Weight: approx. 350 g / 0.77 lbs

2.80.78

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0.77

3/4 NPT

H32

(in)

M12x1

1.4

Weight: approx. 350 g / 0.77 lbs

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Maintenance/service &

Data sheet | Liquid Level Switch, type LLS 4000/4000U

calibration precautions

The LLS 4000 is considered maintenance free, but there are a few precautions that needs attention.

The fins shall be kept free of dirt, dust, paint and oil etc. that potentially reduces the thermal heat transfer from the fins to the air.

Ice build-up on the LLS switch reduces the accessibility for the Bluetooth connection.

- 10 cm icecap reduces the distance from app device to the LLS to 1 meter.

- 20 cm icecap is considered as the maximum to be able to connect.

For LLS cleaning use soft cloth dry or wet or compressed air.

If the electronic part is separated from the mechanical part during installation, service or maintenance, the ingress of any foreign substances to the electronic or mechanical part shall be avoided.

Generally the separating of electronic and mechanical parts should be avoided due to calibration, and the mixing of mechanical and electronic parts from different switches must be avoided. In case of the incident mixing of mechanical and electronic parts from different switches, subsequent recalibration might be required.

Prior to calibration the following must be ensured: The LLS must be out of liquid state (in gas phase), otherwise the calibration might end up incorrect. This can be secured by either emptying the actual vessel or uninstall the LLS to ambient air. While in "dry" surroundings, connect power to the LLS switch and perform the calibration.

Ice as such do not impact the functionality of the product as far as the minimum ambient temperature is respected.

Bluetooth communication

The danfoss LLS app includes the calibration possibility.

- A special Danfoss LLS app can be downloaded from Android google play or IOS app store.

- All communication with all LLS installed in a plant is done by use of this app. Communication can only happen with one LLS at a time.

- Each LLS switch includes its own serial number, which will appear in the app when connected. At the same time the green light LED in the actual connected LLS will be flashing.

Bluetooth® word mark and logos are registered trademarks of Bluetooth SIG Inc. Android and Google Play are registered trademark of Google LLC. App Store is registered trademarks of Apple Inc.

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Data sheet | Liquid Level Switch, type LLS 4000/4000U

Bluetooth

configuration

The first time parameter setting of an individual LLS switch is done by opening of the app and performing a scan for devices. The app will get a list of LLS that are present at the actual location. will include a name and the matching serial number for each of the present LLS.

Choose the first item on the list and observe which LLS' green LED is flashing.

Log-in with the provided PIN code.

(For safety reason the PIN code should be changed afterwards).

Touch the Menu Icon.

Touch the Log-in.

Enter the Password provided.

Rename the device to an up to 24 symbol name (8 symbols visible).

Check the parameter settings and if needed change one or both parameters Media type/ Switch state.

Note the ID: Name, serial number, media type and switch state.

Close the app and observe that the green light stops flashing.

10. This LLS is now ready for operation.

11.

If more LLS are present choose the next item on the list and repeat steps 1 to 10.

The list

The name and configurable parameters of any LLS can be changed at any time.

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Data sheet | Liquid Level Switch, type LLS 4000/4000U

Technical data

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Data sheet | Liquid Level Switch, type LLS 4000/4000U

Safety/ Approvals

Warning! This is a Class A device. This device may cause radio interference in residential areas. In case o may be required to take appropriate measures. This instrument has to be mounted

on a metallic tank. The device is intended to be used in industrial areas.

f interference, the operator

General Warnings/precautions

- Every use that is not described in this data sheet is considered incorrect and is not authorized by the manufacturer.

- The LLS device should only be used with approved media listed under Technical data. Use with other media must be validated by Danfoss before installation.

- Verify that the installation and operating conditions of the device respect those specified in this sheet, especially concerning the supply voltage and environmental conditions.

- All service and maintenance operations must be performed by qualified personnel.

- Installation must comply with local standards and legislation.

- Before carrying out any maintenance operations on the device, disconnect the device from the main power supply.

- Before unscrewing the LLS device from the pipe or tank ensure that pipe or tank is empty and not under pressure.

- Liability for injury or damage caused by incorrect use of the device lies solely with the user.

- Depending on the application, the metallic part of the instrument may be hot or cold.

- If media detection or non-detection by the level switch could generate a hazard the SIL version and specific instructions described in the safety manual (periodic proof test) should be used. The SIL safety manual can be downloaded from the Danfoss web site.

USA/Canada: This device complies with Part 15 of the FCC Rules and with RSS-210 of Industry Canada. Operation is subject to the following two conditions. (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

This device complies with FCC and ISED RF radiation exposure limits set forth for general population. This device must be installed to provide a separation distance of at least 20cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.

The Product Marketing name of the instrument is ‘LLS 4000 series’.

Read and apply safety instructions contained in product documentation.

Contact : Danfoss A/S, 6430 Nordborg, Denmark

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