© Danfoss A/S (AC-SMC/MWA), 01-2012
DKRCI.PI.SC0.D2.02 / 520H5637
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
• 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 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 / NH
3
: –40°C / +50°C (–40°F / +122°F)
R744 / CO
2
: –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)
(Further details in the Technical Brochure)
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. 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:
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 screw 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 and tighten the set 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 a.c. and d.c. supply
whereas the AKS 4100/4100U is using d.c.
supply only.
Follow the instructions in fig. 9.
Connecting to controller or PLC
Follow the instructions in
fig. 10 or 11
.
Note:
The current output will be set to 3.6 mA
whenever the AKS 4100/4100 detects
an error like: "Level lost", "Overfill error" or
"Reference pulse lost".
Quick Setup
→
