Danfoss AKS 4100, AKS 4100U Data sheet

Data Sheet

Liquid level sensor Type AKS 4100 and AKS 4100U

Designed specically to measure liquid levels in a wide range of refrigeration applications

The AKS 4100/4100U liquid level sensor is designed specically to measure liquid levels in a wide range of refrigeration applications.

The AKS 4100/4100U liquid level sensor is based on a proven techhology called Time Domain Reectometry (TDR) or Guided Micro Wave.

AKS 4100/4100U liquid level sensor can be used to measure the liquid level of many dierent refrigerants in vessels, accumulators, receivers, standpipes, etc.The electrical output is a 2-wired, loop powered 4 – 20 mA output signal, which is proportional to the refrigerant liquid level.

AKS 4100/4100U in a cable version is suitable for HCFC, Non ammable HFC and R717 (Ammonia), and diering lengths from 800 mm / 31.5 in. and up to 5000 mm / 197 in.

The coaxial version of AKS 4100/4100U is designed for use with R744 (CO2), HCFC, Non

ammable HFC and R717 (Ammonia).

The AKS 4100/4100U coaxial version should always be used for marine applications for all refrigerant types. The AKS 4100/4100U cable version should NOT be used for CO2 or marine

applications.

Dust, foam, vapour, agitated surfaces, boiling surfaces, changes in density or in the dielectric constant , εr, for the liquid have no inuence on the AKS 4100/4100U performance.

Oil accumulated in the bottom of a standpipe will not disturb the liquid level signal and it is not necessary to remove AKS 4100/4100U for cleaning after oil has been drained out of the standpipe.

AI243386442914en-001101

Liquid level sensor, type AKS 4100 and AKS 4100U

Features

• Approved and qualied by Danfoss for refrigeration applications

• One product covering several probe lengths (cable version)

• A single product for all commonly used refrigerants (cable version)

• Cable version requires less top-end clearance for installation and service

• Proven operation with all refrigerants in combination with oil

• No need to clean cable version when fully covered by oil

• The cable version is very compact and easy to handle, ship, install and use with dierent lengths and refrigerants

• Changes of the liquid dielectric constant (εr) do not aect operation

• 5000 mm / 197 in. probe length with cable version

• 2-wire loop powered; no separate transformer needed

• Multi language HMI. Level and setting readout in mm,cm,m (ft, in.)

◦ Language HMI versions:

▪ English (default), German, French, Spanish ▪ English (default),Japanese, Chinese Russian

NOTE:



AKS 4100/4100U can be connected directly to Danfoss EKE 347 liquid level controller and thus be powered from EKE

347.If used together with Danfoss EKC 347 liquid level controller, a 14 – 30 V DC supply is required.

Liquid level sensor, type AKS 4100 and AKS 4100U

Media

Refrigerants

The listed refrigerants are qualied and approved by Danfoss:

(1)

R717 / NH3: -40 / +50 °C / (-40 / +122 °F) R744 / CO2: -50 / +15 °C / (-58 / +59 °F) HCFC: R22 -50 / +48 °C / (-58 / +118 °F) HFC: R404A -50 / +15 °C / (-58 / +59 °F)

R410A -50 / +15 °C / (-58 / +59 °F) R134A -40 / +50 °C / (-40 / +122 °F)

The listed refrigerants may be used in the complete temperature range of AKS 4100/4100U, however, the accuracy may be aected if the above listed temperature range is exceeded.

Other refrigerants within the groups of HCFC and HFC can be detected and measured if the following conditions are

fullled:

Reference conditions

Dielectric constant Cable version can be used in R717 / NH3, HCFC and HFC (εr, liquid > 5.6 ).

The coaxial version is mandatory for use in:

• R744 / CO2 (εr, liquid > 1.3)

• Marine applications

The coaxial version can also be used in the refrigerants:

• R717 / NH3, HCFC and HFC

New refrigerants

Danfoss products are continually evaluated for use with new refrigerants depending on market requirements.

When a refrigerant is approved for use by Danfoss, it is added to the relevant portfolio, and the R number of the refrigerant (e.g. R513A) will be added to the technical data of the code number. Therefore, products for specic refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.

AKS 4100 Coaxial 280mm and AKS 4100U Coaxial 11 in are only released for R717/NH

123

Signal converter, which can be supplied with or without HMI

Mechanical process connection with 5 m / 197 in., Ø2 mm / 0.08 in. stainless

cable

Counterweight

Accessory bag comprising:

• 3 mm set screws

• Red cover to protect mechanical process connection (2) prior to mounting

signal converter

• Setting label

Description

Features

Refrigerant temperature

-60 °C / +100 °C (-76 °F / +212 °F)

Ambient temperature

-40 °C / +80 °C (-40 °F / +176 °F) For HMI : -20 °C / +60 °C (-4 °F / +140 °F)

Process pressure

-1 – 100 bar / -14.5 – 1450 psig

Terminals (spring loaded)

0.5 – 1.5 mm2 (~20-15 AWG)

Ambient temperature supply voltage limitations:

-40 °C / +80 °C (-40 °F / +176 °F)

-20 °C / +80 °C (-4 °F / +176 °F) : 14 – 30 V DC

Liquid level sensor, type AKS 4100 and AKS 4100U

Product specication

Pressure and temperature data

Table 1: Pressure and temperature data

Product concept

AKS 4100/4100U is available in two dierent versions:

• Cable version

• Coaxial version

Cable version

Figure 1: CABLE version

With the cable version it is possible to adapt the AKS 4100/4100U to any possible length in the range of 800 mm /

31.5 in. to 5000 mm / 196.9 in.

Cable version can be used in R717 / NH3, HCFC and HFC (εr, liquid > 5.6).

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Signal Converter (with or without HMI)

Mechanical process connection with 5 m / 197 in., Ø2 mm / 0.08 stainless wire

Tube(s) depending on required length

Accessory bag comprising:

• End Connector (incl. 3 mm / 0.12 in. set screws.)

• 3 mm / 0.12 in. set crews (1 set screw pr. tube)

• Red cover to protect mechanical process connection (2), before Signal

Converter is mounted

• Setting label

D22 marking

Signal Converter (with or without HMI)

Mechanical process connection 280 mm / 11 in., 8 mm / 0.3 in. inner rod

Liquid level sensor, type AKS 4100 and AKS 4100U

Figure 2: AKS 4100/4100U cable version must ALWAYS be installed in a standpipe

Coaxial version

Coaxial D14 version

Figure 3: Coaxial D14 version

Coaxial D22 version

Figure 4: Coaxial D22 version

The coaxial version is mandatory for use in:

• R744 / CO2 (εr, liquid > 1.3)

• Marine applications

The coaxial version can also be used in the refrigerants:

• R717 / NH3, HCFC and HFC

Danfoss type

Tube diameter

Type selection in HMI

Thread

AKS 4100, 280 mm

22 mm

0.87 in.

D22

G1 in. pipe thread

AKS 4100, 500 mm

14 mm

0. 55 in.

D14

G1 in. pipe thread

AKS 4100, 800 mm

14 mm

0.55 in.

D14

G1 in. pipe thread

AKS 4100, 1000 mm

14 mm

0.55 in.

D14

G1 in. pipe thread

AKS 4100, 1200 mm

14 mm

0.55 in.

D14

G1 in. pipe thread

AKS 4100, 1500 mm

14 mm

0.55 in.

D14

G1 in. pipe thread

AKS 4100, 1700 mm

14 mm

0.55 in.

D14

G1 in. pipe thread

AKS 4100, 2200 mm

14 mm

0.55 in.

D14

G1 in. pipe thread

AKS 4100U, 11.0 in.

22 mm

0.87 in.

D22

¾ in. NPT

AKS 4100U, 19.2 in.

14 mm

0.55 in.

D14

⁄4 in. NPT

AKS 4100U, 30 in.

14 mm

0.55 in.

D14

⁄4 in. NPT

AKS 4100U, 45 in.

14 mm

0.55 in.

D14

⁄4 in. NPT

AKS 4100U, 55 in.

14 mm

0.55 in.

D14

⁄4 in. NPT

AKS 4100U, 65 in.

14 mm

0.55 in.

D14

⁄4 in. NPT

AKS 4100U, 85 in.

14 mm

0.55 in.

D14

⁄4 in. NPT

AKS 4100

B C D

Liquid level sensor, type AKS 4100 and AKS 4100U

Figure 5: AKS 4100/4100U, Coaxial can be installed in a standpipe (a) or directly in a vessel (b)

Table 2: The coaxial version is available in the following probe lengths:

Optional HMI

The optional HMI Service/Display unit is used for commissioning and quick on-site setup and is easily mounted on the AKS 4100/4100U.

The service unit supports mulitple languages in both SI and US units.

Supported standard languages: English (default), German, French, Spanish, Japanese, Chinese and Russian.

Figure 6: HMI display unit

123

4567A

C & D

4 – 20 mA output displayed as bar graph and in percentage [%]

Measurement name (in this example, DISTANCE)

Device tag name

Measurement reading and unit

Device status (markers)

Marker 1, 2 and 3 (Error)

Hardware problem; the Signal Converter hardware is defective. Contact Danfoss

Marker 4 and 5 (Notication)

Depending on the level, the marker is ON or OFF. Used for Danfoss service information only

Keypad buttons

Flashing star indicating unit in operation

Enter menu system Enter QUICK SETUP

Unit change at distance/level readout: m, cm, mm, in, ft

Change between:

Distance

(1)

Level

(2)

Output (%)

(3)

Output (mA)

(4)

Description

Probe types

Values

Options

Cable

Mechanical process connection with 5 m / 197 in., Ø2 mm / 0.08 in. stainless cable: Mechanical thread on the mechanical process connection AKS 4100: G1 in. pipe thread. Aluminium gasket included AKS 4100U: ¾ in. NPT

Coaxial D14

Mechanical process connection with 5 m / 197 in., Ø2 mm / 0.08 in. stainless cable and 14 mm / 0.55 in. outer stainless tube: Mechanical thread on the mechanical process connection AKS 4100: G1 in. pipe thread. Aluminium gasket included AKS 4100U: ¾ in. NPT Stainless steel tubes supporting the available probe length

Coaxial D22

Mechanical process connection with in 22 mm / 0.87 in. outer stainless tube. 8 mm / 0.3 in. inner rod. Mechanical thread on the mechanical process connection AKS 4100: G1 in. pipe thread. Aluminium gasket included AKS 4100U: ¾ in. NPT

LCD display

Insertions (probe) length

Coaxial D14

AKS 4100: 500, 800, 1000, 1200, 1500, 1700 and 2200 mm AKS 4100U: 19.2, 30, 45, 55, 65, 85 in.

Coaxial D22

AKS 4100: 280 mm AKS 4100U: 11.0 in.

Single cable Ø2 mm / 0.08 in.: 800 – 5000 mm / 31.5-197 in.

Dead zone

This depends on the type of probe. (see pages 7 and 8)

Liquid level sensor, type AKS 4100 and AKS 4100U

(1)

If the display is set to “DISTANCE” the displayed value will be the distance from the Reference point to the top surface of the liquid refrigerant

If the display is set to “DISTANCE” the displayed value will be the distance from the Reference point to the top surface of the liquid refrigerant (see Page 11 and Page 12)

(see Page 11 and Page 12)

(2)

If the display is set to “LEVEL” then the value displayed will be: PROBE LENGTH (entered in QUICK SETUP) – DISTANCE (see Page 11 and Page 12)

(3)

Will represent the level of refrigerant,in percent, scaled (entered in QUICK SETUP) according to: SCALE 4 mA (0%), SCALE 20 mA (100%) (see

Page 11 and Page 12).

(4)

Will represent the level of refrigerant, in 4 – 20 milliampere, scaled (entered in QUICK SETUP) according to: SCALE 4 mA (4 mA), SCALE 20 mA

Will represent the level of refrigerant, in 4 – 20 milliampere, scaled (entered in QUICK SETUP) according to: SCALE 4 mA (4 mA), SCALE 20 mA (20 mA) (see Page 11 and Page 12).

(20 mA) (see Page 11 and Page 12).

Design

Table 3: Design

Description

Values

Display Integrated LCD display

128 × 64 pixels in 8-step greyscale with 4-button keypad

Interface languages

English (default), German, French, Spanish, Japanese, Chinese, Russian

Description

Values

Ambient temperature

-40 °C / +80 °C (-40 °F / +175 °F) For HMI: -20 °C / +60 °C (-4 °F / +140 °F)

Storage temperature

-40 °C / +85 °C (-40 °F / +185 °F)

Process connection temperature

Standard: -60 °C / +100 °C (-76 °F / +212 °F)

Operating pressure

Standard: -1 bar to 100 bar / -14.5 psig to 1450 psig

Description

Values

Liquid dielectric constant (εr)

Cable version to be used in R717 / NH3, HCFC and HFC εr, liquid > 5.6 Coaxial version is mandatory in R744 / CO2 εr, liquid > 1.3

Vibration resistance

EN 60721-3-4 (1 – 9 Hz: 3 mm / 10 – 200 Hz:1g; 10g shock half-wave sinusoidal: 11 ms)

Protection category

IP 66/67 equivalent to NEMA type 4X (housing) and type 6P (probe)

Description

Values

Dimensions and weights

See Dimensions and weights

Description

Values

Housing

Aluminium

Coaxial D14 and D22 version

Standard: Stainless steel (1.4404 / 316L)

Single cable

Standard: Stainless steel (1.4401 / 316)

Process tting

Standard: Stainless steel (1.4404 / 316L)

Gaskets

EPDM (-50 / +150 °C (-58 / +300 °F)

Cable gland

Plastic (black)

Description

Values

Single cable Ø2 mm / 0.08¨

AKS 4100: G1 inch pipe thread. Aluminium gasket included AKS 4100U: ¾ in. NPT

Coaxial D14 and D22 version

AKS 4100: G1 inch pipe thread. Aluminium gasket included AKS 4100U: ¾ in. NP

Description

Values

Power supply

Terminals output: 14 – 30 V DC. Min./Max. Value for an output of 22 mA at the terminal. Ambient temperature limitations: -40 °C / +80 °C (-40 °F / +176 °F) : 16 – 30 V DC

-20 °C / +80 °C (-4 °F / +176 °F) : 14 – 30 V DC

Current output load

RL [Ω] ≤ ((Uext -14 V)/20 mA). – Default (Error output set to 3.6 mA) RL [Ω] ≤ ((Uext -14 V)/22 mA). – (Error output set to 22 mA)

Cable gland

AKS 4100: PG 13, M20×1.5 ; (cable diameter: 6 – 8 mm / 0.24 – 0.31 in.) AKS 4100U: ½ in. NPT

Cable entry capacity (terminal)

0.5 – 1.5 mm2 (~20-15 AWG)

Description

Values

Output signal

4 – 20 mA or 3.8 – 20.5 mA acc. to NAMUR NE 43

Resolution

±3 μA

Temperature drift

Typically 75 ppm/K

Error signal

High: 22 mA; Low: 3.6 mA acc. to NAMUR NE 43; Hold (frozen value - not available with NAMURNE 43 compliant output

Liquid level sensor, type AKS 4100 and AKS 4100U

Table 4: Display and User interface

Table 5: Operating conditions

Table 6: Other conditions:

Table 7: Installation conditions

Table 8: Material

Table 9: Process connections - Thread

Table 10: Electrical connections

Table 11: Input and output

Power supply U [VDC]

Current output load R

[ ]

Features

Description

Measuring principle

2-wire loop-powered level transmitter; Time Domain Reectometry (TDR )

Application range

Level measurement of liquid refrigerants. Approved refrigerants: Halogen Free / Environmently friendly: R717 / NH3, R744 / CO

HCFC and non ammable HFC.

Primary measured value

Time between the emitted and received signal

Secondary measured value

Distance or level

Liquid level sensor, type AKS 4100 and AKS 4100U

Minimum power supply voltage

Figure 7: Use this graph to nd the minimum power supply voltage for a given current output load:

NOTE:



Minimum power supply voltage for an output of 22mA at the terminal.

Measuring system

Table 12: Measuring system

Measuring principle (Cable and Coaxial)

The AKS 4100/4100U electronic converter emits low-intensity, high frequency electromagnetic pulses with a width of approximately 1 nanosecond, which travel at the speed of light along the probe (wire or coaxial cable) down to the liquid surface.

The pulses are reected by the liquid surface, guided back along the probe, and received and analysed by the AKS 4100/4100U electronic converter and then converted into a liquid level reading. This method is called time domain reectometry (TDR) or guided microwave.

The dielectric constant, εr, of the liquid is a key parameter and has a direct impact on the degree of reection of the high frequency electromagnetic pulses. Liquids with high εr values, such as ammonia, produce strong reections, while liquids with low εr values, such as CO2, produce weak reections.

As long as the εr value of the liquid refrigerant is higher than 1.2, AKS 4100/4100U can detect the liquid level and level measurement accuracy is not aected.



NOTE:

If the temperature condition in the standpipe /vessel is known, a constant (dielectric constant of the refrigerant gas) can be entered (parameter 2.5.3 GAS EPS.R), in order to obtain improved Top and Bottom Dead Zone values.

Refer to Page 11 page 10 and Page 12 for Measuring range of AKS 4100/4100U - CABLE version and COAXIAL version.

For details of gas constant values for dierent temperatures and refrigerants plus the procedure for entering these via the HMI, refer to Page 23 and Page 24.

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