AQ KS User manual

Level Switch
Manual
AQ M-Tech AB

AQ M-Tech AB Level Switch Manual 2

AQ M-Tech AB Level Switch Manual 3
Level Switch KS
Level Switch RS
Level Switch LS
AQ M-Tech AB
Manual version 3.4
March 2017

AQ M-Tech AB Level Switch Manual 4
Table of contents
1. Manufacturer information........................................................................... 5
CE Declaration of Conformity ......................................................................... 5
Limited Warranty............................................................................................. 5
Warning .......................................................................................................... 5
Certificate of Quality and Function.................................................................. 5
Manufacturer:.................................................................................................. 5
2. Introduction................................................................................................ 6
3. Mode.......................................................................................................... 6
4. Level Switch Mode..................................................................................... 6
5. Level Sensor Mode.................................................................................... 6
6. Gel Sensor Mode....................................................................................... 7
7. Installing the Level Switch.......................................................................... 8
8. Technical Data........................................................................................... 9

AQ M-Tech AB Level Switch Manual 5
1. Manufacturer information
AQ M-Tech AB operates a policy of on-going development and reserves the right to make
changes and improvements to any of the products described in this manual without prior notice.
Under no circumstances shall AQ M-Tech be held responsible for any loss or indirect damage
howsoever caused. The contents of this document are provided as it is. AQ M-Tech AB reserves
the right to revise this document or withdraw it at any time without prior notice.
CE Declaration of Conformity
Manufacturer: AQ M-Tech AB Sweden declares, that the product:
Level Switch marked with CE-label conforms with the following standards: EN 61000-6-2:2001,
EN 61000-6-4:2001, EN55011 (Group 1, Class B).
Limited Warranty
AQ M-Tech AB warrants to the original end user that the Level Switch is free from any defects in
materials or workmanship for a period of one year from the date of purchase. During the warranty
period, should the Level Switch have indications of failure due to faulty workmanship or materials,
AQ M-Tech AB will replace it with no charge. This warranty shall not apply if the Level Switch is
modified, misused or subjected to abnormal working conditions.
Replacement as provided under this warranty is the only remedy of the purchaser. The purchaser
pays freight to AQ M-Tech AB. AQ M-Tech AB shall in no event be held liable for indirect or
consequential damages of any kind or character to the purchaser.
Warning
The Level Switch is intended to be connected to the Ultrasound Controller D72 or DP72,
manufactured by AQ M-Tech AB. AQ M-Tech AB takes no responsibility for any possible damage
that could happen if the Level Switch is connected to any other equipment.
Certificate of Quality and Function
AQ M-Tech AB guaranties that the Level Switch has passed function and quality tests.
Manufacturer:
AQ M-Tech AB
Bolandsgatan 10 Phone: + 46 18-470 29 00
SE-753 23 Uppsala Fax: + 46 18-10 50 04
Sweden
www.aqmtech.se [email protected]

AQ M-Tech AB Level Switch Manual 6
2. Introduction
When the Level Switch is attached to the outside of a container or pipe it can sense liquid level
inside. The Level Switch senses trough the wall without any need for a hole in the container. The
Level Switch is made to be used together with the Ultrasound Controller D72 or DP72. Level
Switch LS is also available ATEX certified, see Level Switch EX manual. Level Switch KS is a new
Level Switch with improved specifications that can be used instead of Level Switch LS.
3. Mode
The sensor Mode setting of the Ultrasound Controller D72 or DP72 determines in which way the
Level Switch measures the level.
In Level Switch mode the Level Switch measures a single level from the side.
In Level Sensor mode the Level Switch measures a continuous level from the bottom.
In Gel Sensor mode the Level Switch measures a single gel-level from the side.
4. Level Switch Mode
In Level Switch Mode each Level Switch measures a single level. It measures the presence or no
presence of liquid behind the container wall (or pipe wall).
All types of Level Switches can be used in Level Switch Mode but use different measuring
techniques. There are two measuring techniques Echo and WR (see Ultrasound Controller D72
and DP72 manual).
Level Switch KS and Level Switch LS should be used with the Echo technique and Level Switch
RS must be used only with the WR technique.
The Level Switch is attached on the wall of the container or pipe. For a cylindrical wall, a Level
Switch with a diameter close to the diameter of the container should be chosen. The ultrasound
must pass easy into the container or pipe; therefore there must be a tight ultrasound-connection
without any air-gap between the Level Switch and the wall.
5. Level Sensor Mode
In Level Sensor mode the Level Switch measures the continuous liquid level. The Level Switch is
attached under the container and measures trough the bottom.
Level Switch KS or Level Switch LS should be used (Level Switch RS can not be used).
A Level Switch that fits the shape of the bottom should be chosen.
The Level Switch measures the echo that bounces at the liquid
surface. It is important the echo goes straight back to the Level
Switch. If the Level Switch and the bottom are not horizontal then the
echo may bounce in another direction.
If the bottom is not horizontal, silicone can be used to glue the Level
Switch at an angle. In this case the Level Switch should be
connected to D72 and be active measuring while being glued so that
it can be adjusted for maximum echo.
Sound has to be able to pass trough the bottom. Most plastics let
sound trough well except polypropylene and fiber reinforced plastics.
For stainless steel, a bottom thickness of 5,8mm is the maximum
recommended. Stainless steel 5,8mm 2,9mm and 1,45mm works

AQ M-Tech AB Level Switch Manual 7
well at 2MHz which is the optimal frequency for the Level Switch. For other thicknesses other
frequencies will be chosen by D72 / DP72.
Sound velocity varies with liquids and temperatures. A Level Switch placed low on the container
wall can be used to measure and compensate for sound velocity changes.
More information: Ultrasound Controller D72 / DP72 manual.
6. Gel Sensor Mode
In Gel Sensor Mode each Level Switch measures a single gel-level. It measures the presence or
no presence of gel or air behind the column wall.
Level Switch KS can be used in Gel Sensor Mode. The ultrasound must pass easy into the
container or pipe; therefore there must be a tight ultrasound-connection without any air-gap
between the Level Switch and the wall.

AQ M-Tech AB Level Switch Manual 8
7. Installing the Level Switch
How to install the Ultrasound Controller D72 or DP72 and connect the cables is described in the
Ultrasound Controller D72 or DP72 manual.
There must be a tight ultrasound-connection without any air-gap between the Level Switch and
the container. This is easy achieved by using glue. Alternatives for glue do also exist.
Silicone is heat-resistant and is the best glue at all temperatures, even above 80C. A Level
Switch glued with silicone is also very easy to remove. The silicone can be Loctite 5366 or a
similar transparent (1-component moisture curing) silicone. It takes a few days to cure. Put some
silicone on the container-facing side of the Level Switch and press it on to the container. The
silicone should cover any gap between the Level Switch and the container. During the first hours
the Level Switch must be held properly in place with something like a tape or so. The Level Switch
can be used even though the silicone is not completely cured (which takes a few days).
Transparent 1-component MS-polymer can also be used if temperature is not above 80C. It is
flexible like silicone and takes some days to cure.
Hard glues should be avoided since they can come loose by temperature variations.
For temporary testing and when the Level Switch is not glued, Sonotech SONO 600 is
recommended. An economic alternative is Electrolube Heat Transfer Compound which can also
be used for transferring sound. It does not cure so the Level Switch must be held in place by other
means. If the Level Switch is removed, the old SONO 600 or Heat Transfer Compound should be
wiped off and new used next time. Heat Transfer Compound is not recommended at temperatures
above 60C.
The measuring technique WR used in Level Switch mode is sensitive for small movements, which
may occur when gluing is not done, therefore if not glued a stable support is needed.
Stainless Steel and Glass Containers
When the Level Switch is mounted on a stainless steel or glass container and the echo-technique
is used, it is advisable to also attach a sound absorbing tape on the container. The tape will
supress unwanted sound travelling along the
container and thereby improve the measurements
(the Edata will be lower with air, making threshold
Ethd also lower, which is good). The 3M tape
8671 is suitable for this purpose. It withstands
high temperature 135°C. The tape is transparent
and can be removed without leaving any trace.
The picture shows the tape with the protective
paper still attached. It should be placed centered
over the Level Switch and go around the
container, starting and ending near the Level
Switch. The important area to cover is about 100mm on each side, close to the Level Switch. On a
big container, if the tape is too short, it can be cut in two pieces and placed on each side of the
Level Switch. The tape is 50,8mm wide and one tape should be used for each Level Switch.
Attaching tape above or below the Level Switch does not help. The tape is supplied with the Level
Switch in 500mm length and can also be ordered separately from AQ M-Tech, order number
101310. The material is polyurethane and acetone should not be used for cleaning the tape.

AQ M-Tech AB Level Switch Manual 9
8. Technical Data
Level Switch
RS
Fit container / pipe
diameter (mm)
Level Switch
KS
Fit container
diameter (mm)
Level Switch
LS
Fit container
diameter (mm)
RS27
¾” DN20 26 – 28
KS27
26 –28
LS46
44 –47
RS30
29 –31
KS30
29 –31
LS49
48 –50
RS34
1” DN25 32 – 35
KS34
32 –35
LS53
51 –58
RS38
36 –40
KS38
36 –40
LS65
59 –69
RS42
1¼” DN32 40 – 43
KS42
40 –43
LS75
70 –79
RS46
1½” DN40 44 – 49
KS46
44 –49
LS85
80 –91
RS53
50 –57
KS53
50 –57
LS100
92 –106
RS65
2” DN50 58 – 69
KS65
58 –69
LS115
107 –124
RS75
2½” DN65 70 – 79
KS75
70 –79
LS135
125 –147
RS85
3” DN80 80 – 98
KS85
80 –98
LS165
148 –180
RS115
4” DN100 98 – 135
KS115
98 –135
LS200
180 –240
RS165
6” DN150 135 –200
KS165
135 –200
LS300
240 –400
RS250
200 –350
KS250
201 –350
LS600
400 –1000
RS600
350 –1000
KS600
351 –1000
LSF
1000 –Flat
RSF
1000 –Flat
KSF
1000 –Flat
Level Switch
Level Switch RS
Level Switch KS
Level Switch LS
Material
PEI
POM-H
Container / pipe temperature
-20C to 140C
-15C to 60C
Ambient temperature
-20C to 60C
-15C to 60C
Cable
data
Order number
Cable type
4 x 0,14mm² + screen,PVC, diameter 4,1mm
Cable Length
7m connector 0° grey
G–Cable–7m
7m connector 90° grey
WG–Cable–7m
20m connector 0° grey
G–Cable–20m
20m connector 90° grey
WG–Cable–20m
40m connector 90° grey
WG–Cable–40m

AQ M-Tech AB Level Switch Manual 10
Level Switch
Dimensions
comment
Level Switch KS
L = 15mm
R = fit container diameter
Level Switch KSF
L = 20mm
R = flat surface
Can fit a depression 8mm deep
Level Switch RS
L = 40mm
R = fit container diameter
Level Switch RSF
L = 40mm
R = flat surface
Level Switch LS
See drawings
Old version, for new design use
Level Switch KS
Level Switch
LS
Cable 0
Cable 90
Level Switch RS
Level Switch RSF
Level Switch KS
Level Switch KSF
Level Switch
LSF