© Danfoss A/S (AC-MCI/MWA), 11-2013 DKRCI.PI.SC0.E5.02 / 520H5658 5
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 4100/4100U
• There is highly conductive foam in the tank.
• The liquid is very turbulent or agitated.
AKS 4100/4100U Coaxial with or without
HMI does not need any change of setting to
operate, unless used in CO
2
.
Presetting:
4 mA : Probe length - 100 mm (4 in.)
20 mA: 120 mm (5 in.)
Refrigerants
AKS 4100/4100U is designed specifically to
measure liquid level in the most commonly
used refrigerants, including R744 (CO
2
),
R717(ammonia), HCFC, HFC and non corrosive
gases/liquids.
Basic data
AKS 4100/4100U is a passive 2-wire 4-20 mA
sensor that is loop powered.
Supply Voltage
14-30 V d.c. 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°C/100°C (–76°F/212°F)
Refrigerants
The listed refrigerants are qualified and
approved by Danfoss:
R717 / NH3: –40°C / +50°C (–40°F / +122°F)
R744 / CO2: –50°C / +15°C (–58°F / +59°F)
HCFC:
R22: –50°C / +48°C (–58°F / +118°F)
HFC:
R404A: –50°C/ +15°C (–58°F / +59°F)
R410A: –50°C /+15°C (–58°F / +59°F)
R134A –40°C /+50°C (–40°F /+122°F)
Ambient temperature
–40°C / +80°C (–40°F / +175°F)
For HMI : –20°C / +60°C (–4°F / +140°F)
Process pressure
–1 barg / 100 barg (–14.5 psig / 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. 7). 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
Tube(s)
Bag with:
End Connector (incl. 3 mm set screws.)
3 mm set crews (1 set screw pr. tube)
Red cover to protect Mechanical process
connection , before Signal converter is
mounted
Setting label.
Assembly of the segmented coaxial probe
Please observe that the stainless
steel wire is not permanently creased
or kinked.
1. Take the end of the stainless wire and feed
it through the center hole of the plastic
spacer located at the top of each tube
(see fig. 2). Feed the entire length of the
stainless wire through the tube and out at
the bottom. If more than one tube; repeat
the steps.
2. Assemble the segments of tube and
(see fig. 3). Use a 17 mm open-end
wrench to tighten the assembled parts.
3. If more than one tube; repeat the steps
(see fig. 3).
4. Prior to assemble, disassemble signal
converter and mechanical process
connection, and fit red protection cap at
mechanical process connection. Thread the
fully assembled tube onto the mechanical
process connection .
5. Lock each tube by tightening the set screw
with a 3 mm hex key (see fig. 3).
6. Pull the stainless wire through the end
connector (see fig.4).
7. Attach the end connector to the bottom
of the fully assembled tube.
Tighten the set screw with a 3 mm
hex key (see fig. 4).
8. Pull the end of the stainless steel wire
extending from the end connector with
pliers (see fig. 4) to ensure that the
tension in the signal cable is correct.
Tighten the 2 set screws with a 3 mm
hex key to lock the stainless wire.
9. Cut the stainless wire about 20 mm (0.8 in.)
below the end connector (see fig. 5).
10. Measure the probe length (without the signal
converter) before fitting the assembled probe
in the standpipe (see fig. 6).
Use a torque wrench to tighten the
mechanical process connection
(fig. 1, item 2) to 120 Nm (89 lb/ft).
If factory setting needs adjustment
Probe length, scale 4 mA and 20 mA for HMI
Quick Setup.
Probe length:
See probe length on Danfoss product label or
measure probe length (see fig. 6).
Scale 4 mA: (for max. measuring range)
= Probe Length
– Bottom dead zone (see fig. 6)
Scale 20 mA:(for max. measuring range:)
= Top dead zone (see fig. 6)
Example (AKS 4100)
Given conditions:
Probe length: 1200 mm
Refrigerant: CO
2
, –35°C
The gas constant Er is always adjusted
from the Quick Setup
Probe length:
= 1200 mm
SCALE 4 mA setting for max. measuring range:
= Probe length (1200 mm)
– Bottom dead zone (see fig. 6)
(170 mm) = 1030 mm (40.9 in.)
SCALE 20 mA Setting for Max. Measuring
range:
= Top dead zone (see fig. 6)
= 120 mm (4.7 in.)
From page 8:
Dielectric constant of refrigerant gas
parameter 2.5.3 GAS EPS.R
= 1.02
How to mount the AKS 4100/4100U
Converter (see fig 7)
1. Using a 5-mm hex key, loosen the setscrew
in the Signal Converter.
2. Slide the Signal Converter down until
it rests on the mechanical process
connection.
3. Turn the Signal Converter to the wanted
position and tighten the set screw with a
5 mm Hexagon key
Electrical installation/connection
Output terminals (fig. 8 and 9):
1. Current output –
2. Current output +
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.
Note:
The signal converter can be programmed
with or without mechanical process connector
assembled.
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. 13) will
appear.
Precausions when changing from
AKS 41/41U to the AKS 4100/4100U:
Please note:
The AKS 41/41U can be used with a.c. and
d.c. supply, but the AKS 4100/4100U can
only be used with a d.c. supply. Follow the
instructions in fig. 10.
Connecting to controller or PLC
Follow the instructions in fig. 11 or 12.
Note:
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 →
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