© Danfoss | DCS (MWA) | 2017.07
DKRCI.PI.SC0.F3.ML | 520H8392 | 7
ENGLISH
Please observe that AKS 4100/4100U
is intended to always be installed in
a standpipe (column / bypass / stilling
well). A Standpipe is commonly used when:
• Servicing the AKS 4100
• There is highly conductive foam in the tank.
• The liquid is very turbulent or agitated.
Refrigerants
AKS 4100/4100U is designed specifically to measure
liquid level in the most commonly used refrigerants,
including R717(ammonia), HCFC, HFC and non
corrosive gases / liquids.
AKS 4100/4100U can also be used with R744 (CO
2
) in
the coaxial version. Please see the technical
brochure for further details.
Basic data
AKS 4100/4100U is a passive 2-wired 4 – 20 mA
sensor that is loop powered.
Supply Voltage
14 – 30 V DC Min/Max. value for a max. output of 22
mA at the terminal
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 (0.24-0.31in.)
AKS 4100U
½ in. NPT
Terminals (spring loaded)
0.5-1.5 mm
2
(~20-15 AWG)
Enclosure
IP 67 (~NEMA type 4X)
Refrigerant temperature
-60 – 100 °C / -76 – 212 °F
Refrigerants
The listed refrigerants are qualified and approved by
Danfoss:
R717 / NH
3
:
-40 – 50 °C / -40 – 122 °F
R744 / CO
2
:
-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
(Further details in the Technical Brochure)
Ambient temperature
-40 – 80 °C / -40 – 175 °F
For HMI : -20 – 60 °C / -4 – 140 °F
Process pressure
-1 – 100 barg / -14.5 – 1450 psig
Mechanical process connection with 5 m / 197 in.
Ø2 mm / 0.08 in. stainless cable:
AKS 4100
G1 inch pipe thread.
Aluminium gasket included
AKS 4100U
¾ in. NPT
(Further details in the Technical Brochure)
Mechanical Installation
Preparations prior to Mechanical Installation
Disassemble the Signal Converter from the
Mechanical process connection (use 5´mm hex key,
see fig. 6). Fit the red protection cover on top of the
Mechanical process connection to protect it againt
any moisture or dirt paticles.
Content supplied (fig. 1)
Signal Converter (with or without HMI)
Mechanical process connection with
5 m / 197 in. Ø2 mm / 0.08 in. stainless wire
Counterweight
Accessory bag comprising:
3 mm set screws.
Red cover to protect mechanical process
connection
prior to mounting Signal
converter.
Setting label.
Note:
Stand pipe design guidelines:
The side connection pipes must NOT
penetrate into the stand pipe (fig. 2a)
Recommended diameter of the side
connection pipe: 0.5 x stand pipe diameter
(e.g. if stand pipe has diameter DN100, the
side connection must be diameter DN50 or
smaller) (fig. 2a).
If above design guidelines for side connection are
not fulfilled, one of the following options are
recommended:
1. Increase Detection Delay. Parameter 2.3.6.
We recommend to increase the Detection Delay
(parameter 2.3.6) from the standard
0 mm to a value below the lowest point of the
top side connection plus 50 mm (fig. 2a).
Changing the Detection Delay (parameter
2.3.6) does not require changing the (0% ) 4mA
and (100%)20mA settings in the AKS 4100/4100U
Within the Detection Delay zone, no measuring
will take place.
2. Exchange from Cable to Coaxial version.
The stand pipe must have the SAME diameter through
out the entire length. If standpipe diameter differs in
width (fig. 2b) the Cable version is not recommended.
Coaxial version should be used.
Adjustment of the counterweight blades
Allow 5 mm space between the guided blades and
the inner wall of the pipe (see fig. 2c). Use side
cutters to trim the guided blades to fit the actual
standpipe diameter (see fig. 3).
Adjustment of the cable probe
Please observe that the stainless steel wire is
not permanently creased or kinked.
Always use the reference point, at the Mechanical
Process Connection (see fig. 4), as a starting point
for all measuring to determine:
• Where to cut the cable.
• Probe length (see fig. 5)
• Scale 4 mA (see fig. 5)
• Scale 20 mA (see fig. 5)
Note the probe length, Scale 4 mA and Scale 20 mA
for use later when programming the HMI (Human
Machine Interface) on the AKS 4100/4100U.
Follow these instructions and see fig. 4 & 5:
1. Measure the inner length of the Standpipe.
2.
Preparation before cutting the cable
Known data:
Space below counterweight: 20 mm / 0.8 in.
Steel wire insertion length in
counterweight: 12 mm / 0.5 in.
counterweight height: 33 mm / 1.3 in.
Max Probe length =
Standpipe inner length
– Space below counterweight (20 mm / 0.8 in.)
The cable length =
Max probe length
+ Steel wire insertion
length in counterweight (12 mm / 0.5 in.)
– Counterweight height (33 mm / 1.3 in.)
3. Measure out the cutting point of the cable.
Measure from the reference point (fig. 4)
and cut the cable.
4. Fit the counterweight on the cable and
secure the two set screws with a 3 mm Allen
Key
(fig. 3).
5. Lower the counterweight down through
the threaded hole. Make sure that the
counterweight is gliding down through
the pipe without any resistance and
that the cable is straight (not touching
the inner walls of the stand pibe or any
incoming piping (see fig. 2a)).
6. Use a torque wrench to tighten the
mechanical process connection
(fig. 1, item 2) to 120 Nm (89 lb/ft).
Calculating the measuring range
4 mA
setting for max. measuring range:
= Max probe length
– Counterweight height (33 mm / 1.3 in.)
– Bottom dead zone (see fig. 5)
20 mA
setting for max. measuring range:
= Top dead zone (see fig. 5)
Example
Known data:
Space below counterweight: 20 mm / 0.8 in.
Steel wire insertion length in
counterweight: 12 mm / 0.5 in.
counterweight height: 33 mm / 1.3 in.
Preconditions:
Factory setting is used
Refrigerant = Ammonia
Standpipe inner length = 3100 mm / 122 in.
Max probe length =
3100 mm – 20 mm = 3080 mm
(122 in. – 0.8 in. = 121.3 in.)
The cable length:
Max probe length =
+ Steel wire insertion length in
counterweight (12 mm / 0.5 in.)
– Counterweight height (33 mm / 1.3 in.)
3080 mm + 12 mm – 33 mm = 3059 mm
(121.3 in. + 0.5 in. – 1.3 in. = 120.4 in.)
4 mA
Setting for Max. Measuring Range:
Max probe length (3080 mm / 121.3 in.)
– Counterweight height (33 mm / 1.3 in.)
– Bottom dead zone (see fig. 5)
(210 mm / 8.3 in.) = 2837 mm / 111.7 in.
20 mA
Setting for Max. Measuring Range:
= Top dead zone (see fig. 5) = 120 mm / 4.7 in.
How to mount the AKS 4100/4100U Converter
(see fig 6)
1. Unscrew the set and ventilation screws with a
5 mm Hexagon key in the Signal converter.
2. Push the Signal Converter downwards to stop on
the Mechanical process connection
3. Turn the Signal Converter to the wanted position.
4. Screw the set screw with a 5 mm Hexagon key.
5. Screw the ventilation screw with a 5 mm Hexagon
key.
Electrical installation/connection
Output terminals (fig. 7 and 8):
1. Current output –
2. Current
3. Grounding terminal
Electrical installation procedure
1. Use a 2.5 mm Allen wrench to loosen the cover
stop.
2. Remove the terminal compartment cover from
the housing.
3. Do not disconnect the wire from the
terminal compartment cover.
Put the terminal compartment cover
adjacent to the housing.
4. Connect the wires to the device.
Tighten the cable entry glands.
5. Attach the terminal compartment cover to the
housing.
6. Use a 2.5 mm Allen wrench to tighten the cover
stop.
Start up:
• Connect the converter to the power supply.
• Energize the converter.
Devices with the HMI display option only: After 10
seconds the screen will display "Starting up". After 20
seconds the screen will display the software version
numbers. After 30 seconds the default screen (fig.
12) will appear.
Precausions when changing from
AKS 41/41U to AKS 4100/4100U
Note:
AKS 41/41U supports both AC and DC supply
whereas the AKS 4100/4100U is using DC supply
only. Follow the instructions in fig. 9.
Connecting to controller or PLC
Follow the instructions in fig. 10 or 11.
The current output will be set to 3.6 mA
whenever the AKS 4100/4100 detects an
error like Marker 1, 2 or 3 (see page 4).
Quick Setup
→
