Hach-Lange SONATAX sc User Manual

DOC023.52.00117

SONATAX sc

User manual

04/2012, Edition 3A

© HACH-LANGE GmbH, 2006, 2010, 2012. All rights reserved. Printed in Germany

Table of contents

Section 1 Technical data ........................................................................................................................................ 5

Section 2 General information ............................................................................................................................... 7

2.1 Safety information .............................................................................................................................................. 7

2.1.1 Use of hazard information ........................................................................................................................ 7

2.1.2 Precautionary labels ................................................................................................................................. 7

2.2 General sensor information................................................................................................................................ 8

2.2.1 Property rights note .................................................................................................................................. 8

2.2.2 Usage areas ............................................................................................................................................. 8

2.3 Device overview................................................................................................................................................. 8

2.4 Functional principle ............................................................................................................................................ 9

Section 3 Installation ............................................................................................................................................ 11

3.1 Unpack sensor ................................................................................................................................................. 11

3.1.1 Handling of the immersed probe ............................................................................................................ 11

3.2 Connect sensor to an sc controller .................................................................................................................. 11

3.2.1 Connect sensor with quick connection ................................................................................................... 11

3.3 Function test .................................................................................................................................................... 12

3.4 Install sensor.................................................................................................................................................... 13

3.4.1 Select the measurement location and pre-set the device....................................................................... 13

3.4.1.1 Determine the distance to the tank edge ....................................................................................... 15

3.4.1.2 Determine measurement location .................................................................................................. 15

3.4.2 Installation of the sensor......................................................................................................................... 18

3.5 Advanced settings............................................................................................................................................ 18

Section 4 Operation .............................................................................................................................................. 23

4.1 Use of the sc controller .................................................................................................................................... 23

4.2 Sensor data logging ......................................................................................................................................... 23

4.3 Sensor setup.................................................................................................................................................... 23

4.3.1 Change of the sensor name ................................................................................................................... 23

4.4 SENSOR STATUS menu................................................................................................................................. 23

4.5 SENSOR SETUP menu ................................................................................................................................... 23

Section 5 Maintenance ......................................................................................................................................... 27

5.1 Maintenance tasks ........................................................................................................................................... 27

5.2 Wiper change................................................................................................................................................... 27

5.3 Cleaning tasks ................................................................................................................................................. 28

Section 6 Troubleshooting................................................................................................................................... 29

6.1 Operating state LED ........................................................................................................................................ 29

6.2 Error messages................................................................................................................................................ 29

6.3 Warnings.......................................................................................................................................................... 30

6.4 SLUDGE DOCTOR, (diagnostic software for SONATAX sc)........................................................................... 30

Section 7 Replacement parts and accessories ................................................................................................ 31

7.1 Replacement parts........................................................................................................................................... 31

7.2 Accessories...................................................................................................................................................... 31

3

Table of contents

Section 8 Warranty and liability........................................................................................................................... 33

Section 9 Contact ................................................................................................................................................. 35

Modbus register .................................................................................................................................................. 37

4

Section 1 Technical data

Changes reserved!

General

Measurement method Ultrasonic measurement (750–1250 kHz)

Measuring range 0.2 m–12 m (0.7 ft–40 ft) sludge level

Resolution 0.03 m (0.1 ft) sludge level

Accuracy 0.1 m (0.33 ft)

Response time 10–600 s (adjustable)

calibration One time on commissioning

Environmental conditions

Ambient temperature \> 0–50 °C (\> 0–122 °F)

Temperature compensation Automatic

Flow speed Max. 3 m/s

Pressure range

Sensor specifications

Dimensions 130 mm

Earth Approximately 3.5 kg (123.5 oz) (without struts)

Maintenance requirements < 1 hour/month, typically

Cable length 10 m (33 ft), maximum 100 m (330 ft) with extension cable

Power consumption 12 V, 2.4 W, (200 mA)

Protection type IP68 (

Compliance CE, TÜV GS, UL/CSA

Materials

Probe body Stainless steel 1.4581

Base plate and wiper POM

Wiper magnet casting compound Epoxy resin

Wiper rubber Silicone rubber

Housing seals NBR (acrylonitrile butadiene rubber)

Light guide seal Polyurethane

 0.3 bar or  3 m ( 43.55 psi or  10 ft)

× 185 mm (5 in. × 7.3 in.) (H × Ø)

 1 bar (14.5 psi))

Light guide LEXAN polycarbonate

Sensor connection cable 
(fixed connection)

Sensor connection plug (fixed
connection)

Cable gland Stainless steel 1.4571

Cable gland insert TPE-V

Cable gland O-ring NBR, silicone

1 cable pair AWG 22 / 12 VDC twisted, 1 cable pair AWG 24 / data twisted,
common cable shield, Semoflex (PUR)

Type M12, protection type IP67

5

Technical data

6

Section 2 General information

The information in this manual has been carefully checked and is
believed to be accurate. However, the manufacturer assumes no
responsibility for any inaccuracies that may be contained in this
manual. In no event will the manufacturer be liable for direct,
indirect, special, incidental or consequential damages resulting
from any defect or omission in this manual, even if advised of the
possibility of such damages. In the interest of continued product
development, the manufacturer reserves the right to make
improvements in this manual and the products it describes at any
time, without notice or obligation.

Revised editions are found on the manufacturer’s web site.

2.1 Safety information

Please read this entire manual before unpacking, setting up or
operating this equipment. Pay attention to all danger, warning and
caution statements. Failure to do so could result in serious injury to
the operator or damage to the equipment.

Make sure that the protection provided by this equipment is not
impaired, do not use or install this equipment in any manner other
than that specified in this manual.

2.1.1 Use of hazard information

2.1.2 Precautionary labels

DANGER

Indicates a potentially or imminently hazardous situation which, if not
avoided, will result in death or serious injury.

WARNING

Indicates a potentially or imminently hazardous situation which, if not
avoided, could result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation that may result in minor or
moderate injury.

Notice

Indicates a situation that, if not avoided, could result in damage to the
instrument. Information that requires special emphasis.

Note: Information that supplements points in the main text.

Read all labels and tags attached to the instrument. Personal injury
or damage to the instrument could occur if not observed.

This symbol, if noted on the instrument, references the instruction manual for operation
and/or safety information.

7

General information

Electrical devices marked with this symbol may after August 12, 2005 no longer be disposed of in unsorted
domestic or industrial waste Europe-wide. In conformity with European local and national regulations (EU
Directive 2002/96/EC), European electrical equipment users must now return old or end-of life equipment to
the manufacturer for disposal This is free for the consumer.

Note: Obtain instructions on the correct disposal of all (marked and not marked) electrical products that were
supplied or manufactured by the manufacturer at the relevant sales office.

2.2 General sensor information

2.2.1 Property rights note

The SONATAX sc is intended for the measurement of sludge levels
in water. Use in other media without test of the materials (refer to

Section 1 Technical data on page 5) or consultation with the

manufacturer is regarded as explicitly not in accordance with
requirements.

Any use other than use in accordance with requirements defined in
the user manual leads to the loss of the warranty claims and can
lead to personal injury and property damage, for which the
manufacturer assumes no liability.

Parts of the device software are based on the work of the
Independent JPEG Group.

2.2.2 Usage areas

2.3 Device overview

The SONATAX sc can be used anywhere that the solid/liquid
separation layer must be monitored. 
For example in the area of final sedimentation or in sludge
treatment (thickeners).

Figure 1 shows the device components of the SONATAX sc.

Figure 1 Device overview

1 Operating state LED (refer to Section 6.1) 3 Mount for the tank edge attachment
2 Wiper 4 Sensor head

8

2.4 Functional principle

General information

In a tank where solid materials in water (or another fluid) can settle
to the bottom, there is a boundary between the settled solids and
the clear phase above. The distance from the water surface to the
bottom is the sludge level. The sludge height is the distance from
the tank floor.

More precisely, the sludge level (or the sludge height) indicates the
place in a tank where (viewed from the water surface) the solid
content first exceeds a defined limit. This limit value depends on the
application. It will, for example, be higher in a pre-thickener of a
wastewater treatment plant than in its final sedimentation, where
the overlying fluid should be clear water.

The SONATAX sc measures the sludge level via an echo signal
(refer to Figure 2) of an ultrasonic pulse. This echo signal is shown
in the probe menu SENSOR SETUP > TEST / MAINT > SIGNALS
in the echo list (refer to ECHO LIST on page 26). The depth and the
echo strength are specified at the ultrasonic transducer in digits
(1 digit approximately 1 µV).

Figure 2 Functional principle

Echos from layers that are further away are quieter (weaker) than
those which are closer. The SONATAX sc compensates for this
attenuation. The result is indicated on the SONATAX sc as a profile.
The data is found in the probe menu SENSOR SETUP > TEST /
MAINT > SIGNALS in the profile list (refer to PROFILE LIST on

9

General information

page 26) ((2) Figure 3). The graphic display (for example sc1000)

shows the profile in the measurement operation as a graphic ((1)

Figure 3).

Figure 3 Profile as graphic and list

The example shows a typical profile curve of a sludge level
measurement. The Y axis in this graphic reaches from the floor
(which can be set in the probe menu SENSOR SETUP >
CALIBRATE > TANK DEPTH on page 24) up to the water surface.
The profile strength is given on the X axis. The profile increases at
a sludge level. If the solid content below the sludge level remains
constant, the profile strength decreases again due to the absorption
of the ultrasound in the sludge. At the very bottom, the echo of the
floor is normally detected.

The vertical line represents the threshold. The sludge level is
detected by the SONATAX sc at the point at which the profile
exceeds this threshold for the first time viewed from above
(analogous to the abovementioned definition of the sludge level). In
the graphic, the detected sludge level is identified by a mark on the
Y axis.

The threshold is set automatically on the SONATAX sc (setting:
THRESHOLD AUTO = xy % in the probe menu SENSOR SETUP >
CALIBRATE > ADV.SETTINGS > THRESHOLD AUTO on

page 24). The automatic threshold function searches for the

maximum in the detected profile. Through an exact setting of the
tank depth, a faulty measurement due to the echo of the floor is
ruled out.

The background is that the echo signal of the floor in most tanks is
the strongest in the profile. With a correct setting of the tank depth,
the floor signal is not considered by the automatic threshold
function during the determination of the sludge level.

For more information on the correct determination of the tank
depth, refer to section Section 3.4.1 on page 13.

10

Section 3 Installation

3.1 Unpack sensor

DANGER

The installation described in this section of the user manual should only
be performed by qualified and specialized personnel. The sensor is not
suitable for installation in hazardous areas.

The SONATAX sc can be used with an sc100, sc200 or with an
sc1000 controller. Installation instructions are found in the
handbook of the controller.

The SONATAX sc is supplied with the following components:

• Sensor

• User manual

• Wiper blades set (5 pieces)

If one of the parts is missing or damaged, please contact the
manufacturer or dealer.

3.1.1 Handling of the immersed probe

The immersed probe contains a sensitive ultrasound transducer.
Make sure that this is subjected to no hard mechanical impacts. Do
not install the probe hanging on the cable. Make sure before the
insertion of the probe into the medium that all functions run
undisrupted through a check of the system. Check the probe
carefully for external damage.

3.2 Connect sensor to an sc controller

3.2.1 Connect sensor with quick connection

The sensor cable is very easy to connect to the controller using a
quick connection (Figure 4). Keep the protective cap of the
connection socket in case you remove the sensor later and must
seal the socket. For longer sensor cable lengths, optional extension
cables are available.

Figure 4 Connect sensor with quick connection

11

Installation

1

2

3

4

5

6

Figure 5 Pin assignment of the quick connection

Number Assignment Wire color

1 +12 V= Brown
2EarthBlack
3 Data (+) Blue
4 Data (–) White

5Shield

6 Insulator notch

Shield (gray wire for existing quick

connection)

3.3 Function test

Directly after the connection of the sensor to the controller, perform
a function check.

1. Connect the controller to the mains power.

2. If the controller does not recognize the new sensor, go to the

SCAN SENSORS menu (refer to the user manual of the
controller).

3. Confirm any prompt and wait until the new sensor is found.

If the new sensor is found, the controller switches to the
measurement operation.

A wipe process is triggered and the device switches to the
measurement operation. If no other messages appear, the sensor
is functional.

Note: Measurements in air lead to no measurement values. The error
message SENSOR MEASURE is shown. This does not show a
malfunction.

12

3.4 Install sensor

Installation

The SONATAX sc is intended for installation with a tank edge
attachment. For more information, refer to the installation
instructions of the tank edge attachment.

Note: Do not begin with the installation of the tank edge attachment before
the installation location is determined (refer to Section 3.4.1).

Figure 6 SONATAX sc scale drawing

3.4.1 Select the measurement location and pre-set the device

In the determination of the sludge level over the duration of an
ultrasonic echo, the entire space between the probe on the water
surface and the tank bottom is required for the measurement. As
solid bodies in this area disrupt the measurements, special
attention is required in the selection of the measurement location.
In the following, it is explained how the suitability of a possible
measurement location can be tested. The tank depth should be
known here.

A suitable measurement location must be found depending on tank
type. The graphics that follow show typical examples for a round
tank and a rectangular tank. The point (1) in Figure 7 and Figure 8
is a suitable measurement location.

13

Installation

Figure 7 Round tank graphic

Figure 8 Rectangular tank graphic

At a suitable measurement location, there should be:

• Sufficient sludge present for the measurement, and

14

• A calm, clear phase above the sludge level

In the examples shown, area (A) shows only very little or no sludge,
while in the area (C) above the sludge layer, sludge clouds may
disrupt the measurement. The measurement points (A) and (C) are

not suitable for the installation. Suitable measurement points can be
found in between.

Note: Installation note: For round tanks with a rotating scraper bridge,
install the probe in the direction of rotation on the back of the bridge
(Figure 7).

3.4.1.1 Determine the distance to the tank edge

If the SONATAX sc is installed on the tank edge (i.e. not on a
scraper bridge), make sure there is sufficient distance from the
SONATAX sc to the tank edge.

This distance is dependent on the depth of the tank. 
Use this formula to find a guideline value for this distance:

0.20 m + (0.05 x tank depth in meters) = distance to tank edge

This value can vary depending on composition of the tank. How a
possible installation location can be checked for its suitability is
described in Section 3.4.1.2 Determine measurement location.

3.4.1.2 Determine measurement location

1. Connect the probe to the sc controller and carefully immerse

the probe in the water (approximately
probe cable at the selected measurement location.

Installation

20 cm (7.9 in.)) on the

2. Select the probe menu SENSOR SETUP > CALIBRATE and do
a measurement in the REFLEXLIST menu item.

After a few seconds, the reflex list is shown (refer to REFLEXLIST

on page 24). This list usually contains the tank floor as the

strongest signal.

If strong reflections between the water surface and the tank floor
are present (for example due to pipes, plates etc.), another
measurement location must be selected. Sometimes it is sufficient
to move the probe by a few centimeters.

In the example (Table 1), there are two disruptive reflexes at a
depth of 0.87 m and 2.15 m, and the tank floor is at a depth of

3.30 m.

Table 1 Reflex list

Meters Intensity

0.87 25 %

2.15 2 %

3.30 100 %

At an ideal measurement location, no disruptive reflections should
occur above the floor in the reflex list after multiple measurements
(Table 2).

Table 2 Reflex list

Meters Intensity

3.30 100 %

15

Installation

If no measurement location without disruptive reflexes can be
found, select the probe menu SENSOR SETUP > CALIBRATE and
trigger a measurement in the PROFILE LIST menu item.

• If there are increased values at the depth of the disruptive
reflexes in the PROFILE LIST which influence the
measurement value, another measurement location must be
selected. Sometimes it is sufficient to move the probe by a few
centimeters (refer to

Figure 9, right).

• If the reflections do not disrupt the measurement value, this can
be a suitable measurement location (refer to

Figure 9, left).

Figure 9 Determine measurement location

3. Then assemble the tank edge attachment there and install the
probe.

Note: The probe should be installed approximately 20 cm (7.9 in.) deep
at the installation location (somewhat more than the entire probe head) to
make sure that it remains immersed during the entire measurement
operation.

4. In the CALIBRATE probe menu, enter the actual plunger depth
(Item A,

Figure 10) in the PLUNGERDEPTH menu item.

5. Trigger after approximately 2 minutes another measurement of
the reflex list (to adjust the temperature sensor to the water
temperature) (also refer to

6. In the CALIBRATE probe menu, enter the recorded value of the
tank depth (Item C,

Figure 10) in the TANK DEPTH menu item.

Important note: The shown value of the tank depth is calculated
from information shown:



Tank depth C = plunger depth A + measured distance to floor B
This calculation is performed internally and leads to incorrect
results if the plunger depth is entered incorrectly.

REFLEXLIST on page 24).



16

Installation

Figure 10 Plunger depth–tank depth

Note: Should the reflex list not contain the tank depth (possible when there
is a lot of sludge above the floor), the tank depth must be determined in
another way (e.g. measuring).

Important note: The value entered in the TANK DEPTH menu item
must in no case be larger than the actual tank depth. This could
lead to incorrect measurement values.

In the determination of a suitable measurement location, the
optionally available SLUDGE DOCTOR diagnostic software can be
helpful (refer to 7.2 Accessories on page 31). The software enables
the representation and saving of all graphic profiles of the
SONATAX sc in a defined time interval (5 minutes–2 hours).

17

Installation

3.4.2 Installation of the sensor

The software also shows and saves all important measurement and
configuration parameters, such as the reflex list, measurement
values, limit values and all advanced settings, such as response
time, frequency, amplitude, angle and temperature.

Take further information from the SLUDGE DOCT OR user manual

DOC013.98.90411.

Note: Take further information on the installation from the installation

instructions.

3.5 Advanced settings

18

Figure 11 Installation of the sensor

In the SENSOR SETUP > CALIBRATE > ADV. SETTINGS menu,
special probe parameters can be found.

The default settings of these parameters are selected so that no
correction is required in most applications. In exceptional cases,
these parameters must be adapted depending on the application.

The examples that follow show typical sludge profiles.

Installation

Example 1: Pre-thickener with clear separation layer, but

sporadically empty.

The image shows a thickener with a clear profile. The signals above
the sludge level caused by turbid water do not disrupt the
measurement.

The same thickener is empty in this image. The threshold now

justs itself automatically to the signals of the turbid water. The

ad
recorded measurement value at 0.63 m is incorrect.

Recommended measure:

Increase the adjustment of the ADV. SETTINGS > LL THRESH.
AUTO setting from 0.3 to 1.0.

Note: LL THRESH. AUTO gives the smallest possible value that the
threshold can accept.

The image shows the empty thickener after the adjustment. The
result 3.18 m is correct.

Example 2: Application with c
signal.

Very low to absolutely no interference signals through turbid water
above the separation layer. Strength of the echo 0.61 is above the
LL THRESH. AUTO (pre-setting 0.3) and leads to correct
measurement value 2.28 m.

lear separation layer, but weak

19

Installation

Very low to absolutely no interference signals through turbid water
above the separation layer. Strength of the maximum echo <0.3.
Instead of the correct measurement value, only the tank floor is
found.

Increase the adjustment of the ADV. SETTINGS > LL THRESH.

O setting from 0.3 to 0.1. The threshold 0.16 finds the correct

AUT
measurement value 2.25 m.

Example 3: Thickene
concentration up to just under the water surface; echo is absorbed
in the uppermost sludge layer:

In this application, the floor signal is no longer detected due to the
high absorption of the ultrasonic signal. The shown measurement
value 0.73 is correct. No adjustment of the ADV. SETTINGS
necessary.

If the sludge increases so far that the sludge level is above the

easurement range (the measurement range begins from 0.2 m

m
beneath the sensor), it can occur that no sludge level is detected
(SENSOR MEASURE error message). In this case, the application
must be checked.

r or other application with very high sludge

20

Installation

Example 4: Application with large tank depth and clear separation

layer, but high absorption of the ultrasound by turbid materials
above the separation layer.

Absorption is so high that no sludge level is detected at a plunger
depth of 0.2 m and LL THRESH. AUTO 0.1 (SENSOR MEASURE
error message).

After adjustment of the plunger depth SENSOR SETUP >
CALIBRA
precisely determined at 3.30. The strength of the echo 1.41 shows
that there is a clear separation layer.

Note: After adjustment of the plunger depth, the setting of the tank floor
must be checked (SENSOR SETUP > CALIBRATE > TANK DEPTH)

TE > PLUNGERDEPTH to 3 m, the sludge level can be

Example 5: Application with clear separation layer, but interference
signal above the separation layer (for example skimmer).

Ideal profile, correct measurement value.

The same measurement point with sporadic interference of the

o in a 0.67 m tank depth. The measurement value is incorrect.

ech

21

Installation

Fade out this disruption in SENSOR SETUP > CALIBRATE > ADV.
SETTINGS > FADE-OUT in the range of 0.5–0.8 m. The sensor
now ignores all signals in this range and finds the correct
measurement value at 2.13 m.

Example 6: Application
cloud above the separation layer.

In this application, the separation layer should be measured, the
sludge cloud should be ignored (for example pre-thickener).

No change of the default setting. The automatic threshold detects
the separation layer; the echo of the sludge cloud is lower than the
echo of the sludge cloud.

The image shows the same profile as before, but with another

reshold and measurement value.

th

In this application, the sludge cloud should be measured as an
early warning system (for example sludge drift in the final
clarification tank).

Change of the automatic threshold SENSOR SETUP >
CALIBRATE > ADV. SETTINGS > THRESHOLD AUTO to 25 %.
The automatic threshold detects the sludge cloud.

with clear separation layer and a sludge

22

The optionally available SLUDGE DOCTOR diagnostic software
can be helpful for the setting of the special probe parameters (refer
to 7.2 Accessories on page 31). The software enables the
representation and saving of all graphic profiles of the SONATAX sc
in a defined time interval (5 minutes–2 hours).

The software also shows and saves all important measurement and
configuration parameters, such as the reflex list, measurement
values, limit values and all advanced settings, such as response
time, frequency, amplitude, angle and temperature.

Take further information from the SLUDGE DOCT OR user manual
DOC013.98.90411.

Section 4 Operation

4.1 Use of the sc controller

4.2 Sensor data logging

4.3 Sensor setup

Before using the sensor with an sc controller, make yourself familiar
with the operating method of the controller. Learn to navigate
through the menu and to use the menu functions. Further
information is found in the user manual of the controller.

The sc controller provides one data log and one event log for each
sensor. The data log stores the measurement data at selectable
intervals. The event log stores a large number of events that occur
on the devices, such as configuration changes, alarms and
warnings etc. The data log and the event log can be read out in
CSV format. Refer to the controller user manual for more
information about the log download.

During initial sensor setup, select the parameter that corresponds
to the applicable instrument.

4.3.1 Change of the sensor name

When a sensor is installed for the first time, the serial number is
shown as the measurement location (or sensor name). The
measurement location can be changed as follows:

1. From the main menu, select SENSOR SETUP and confirm the
selection.

2. If more than one sensor is connected, mark the required sensor
and confirm the selection.

3. Select CONFIGURE and confirm the selection.

4. Select EDITED NAME and edit the name. Return to the Sensor

Setup menu with confirm or cancel.

4.4 SENSOR STATUS menu

Select the SONATAX sc (if several sensors are connected)

SONATAX sc

ERRORS Lists error messages; refer to 6.2 Error messages on page 29
WARNINGS Lists warnings; refer to 6.3 Warnings on page 30

4.5 SENSOR SETUP menu

Select the SONATAX sc (if several sensors are connected)

WIPE

CALIBRATE

Plunger depth of the probe underside (refer to 3.4.1.2 Determine measurement

PLUNGERDEPTH

location on page 15). 

Configurable: 0.1 m to 3 m (0.3 ft to 9.8 ft)

23

Operation

4.5 SENSOR SETUP menu (Continued)

Select the SONATAX sc (if several sensors are connected)

Shows the reflex list. A new measurement can be triggered.
A list is shown of all detected solid bodies that have clearly reflected the ultrasonic

impulse. The measurement depth is shown in m or ft and the strength of the

REFLEXLIST

TANK DEPTH

PROFILE LIST

ADV. SETTINGS

FACTOR

THRESHOLD AUTO

LL THRESH. AUTO

FADE-OUT

BEGIN

END

SET DEFAULTS

















reflected signal in %, relative to the strongest signal in the list. This list mostly
contains the tank floor. If strong reflections between the water surface and the tank
floor are present (for example due to pipes, plates etc.), it should be checked
whether another installation location offers better conditions.

Entry of the floor depth (refer to 3.4.1.2 Determine measurement location on

page 15). 

Configurable: 1.00 m to 12 m (3.3 ft to 39.4 ft)
A profile is calculated from the ultrasound echo and shown for the corresponding

depths respectively as profile strength. The profile is similar in its curve with the TS
profile of the tank. At an average solid content, the values are in the order of 1. A
new measurement can be triggered (refer to Figure 3 on page 10).

Correction factor for the speed of sound.
Configurable: 0.3 to 3.0, default setting 1.0

A change of the default factor is only required if the local speed of sound in the fluid
deviates from the speed of sound in water:

Factor (fluid) = speed of sound (fluid) / speed of sound (water)

Note: For applications in water, the factor should remain at 1.0.

With the automatic threshold function, the system constantly adapts the
environmental conditions and automatically changes the sensitivity in order to
guarantee maximum accuracy. 
Recommendation: 75% 
Configurable: 1-95%

LL THRESH. AUTO gives the smallest possible value that the threshold can accept.
Configurable: 0.1 to 1.0, recommendation 0.3

If fixed installations or other influences interfere at certain tank depths, then this
range can be faded out —·it is then completely ignored. 
Configurable: ON, OFF

Upper limit of the range that should be faded out. 
Only active when FADE-OUT = ON.

Lower limit of the range that should be faded out. 
Only active when FADE-OUT = ON.

Reset to factory configuration for all probe-specific parameters. This occurs only
after a security prompt.

24

4.5 SENSOR SETUP menu (Continued)

Select the SONATAX sc (if several sensors are connected)

KONFIGURIEREN (CONFIGURE)

Operation

EDIT NAME

PAR AMETER

MEAS UNITS

CLEAN. INTERVAL

RESPONSE TIME

LOGGER INTERVAL

SET DEFAULTS

TEST / MAINT

PROBE INFO

SENSOR NAME Display of the device name.

EDIT NAME

SERIAL NUMBER. Device number
MODEL NUMBER Item no. of the sensor.
HARDWARE-VERS Production status of main circuit board
SOFTWARE-VERS Sensor software version

COUNTER

WIPER COUNTER

TOTAL TIME Operating hours counter
MOTOR Forward counter for wiping processes.
TEST / MAINT Date of the last performed maintenance.

REPLACE PROFILE











Freely editable (up to 16 characters) 
Factory setting: device number

The measurement result can be shown as the sludge level (as the distance of the
sludge from the water surface) or as the sludge height (as the distance from the tank
floor). To calculate the sludge height, the tank depth specified in the TANK DEPTH
menu item is used. 
(Sludge height = tank depth – sludge level) 
Configurable: sludge level, sludge height

Dimension of the measurement result. 
Configurable: meters, feet

Wipe interval, 
Recommendation: 15 minutes 
Configurable: 1 minute to 1 hour

Damping of the measurement value. In the case of high measurement value
fluctuations, a high damping of for example 300 seconds is recommended. 
Configurable: 10 to 1800 seconds

The interval for the internal data log. 
Configurable: 1, 2, 3, 4, 5, 6, 10, 15, 30 minutes

Reset to factory configuration for all menu items listed above. This occurs only after
a security prompt.

Display of the freely selectable measurement location 
(factory setting: device number).

Backward counter for wiping processes of the wiper profile. 
After expiration of the counter, a warning message is shown. In the case of a wiper
change, the counter should be reset again.

For the wiper profile change, the wiper arm moves to a central position. In this
position, the wiper arm can then be removed and installed without problems.

25

Operation

4.5 SENSOR SETUP menu (Continued)

Select the SONATAX sc (if several sensors are connected)

TEST / MAINT

SIGNALS

MOIST Indicator as to whether water is in the probe.
TEMPERATURE Temperature of the surrounding water in °C or F°.
SENSOR ANGLE Deviation of the probe axis from the perpendicular in degrees.

The received echo signal in digits (units of the AD converter) is shown at the

ECHO LIST

PROFILE LIST

REFLEXLIST

FREQUENCY The resonance frequency of the ultrasound transducer is shown.
AMPL DIAG The resonance voltage of the ultrasound transducer is shown.

THRESHOLD

SHOW AMPL.

corresponding measurement depths in a list. The first element at 0 meters shows the
strength of the transmission pulse. 
A new measurement can be started.

A profile is calculated from the ultrasound echo and shown for the corresponding
depths respectively as profile strength. The profile is similar in its curve with the TS
profile of the tank. At an average solid content, the values are in the order of 1. 
A new measurement can be started. (See Figure 3 on page 10)

Shows the reflex list. A new measurement can be triggered. Refer to REFLEXLIST

on page 24

To determine the sludge level, a profile is first calculated from the ultrasonic echo.
This roughly returns the solid content depending on the tank depth. The sludge level
is assigned to the tank depth where the profile exceeds the threshold for the first
time.

On activation, the resonance profile of the ultrasound transducer is shown instead of
the sludge profile (PROFILE LIST) as a graphic in the measurement window (only
valid with sc1000). The resonance profile can be switched ON and OFF. 
After switch-off, the sludge profile (PROFILE LIST) is shown on the measurement
window again.

26

Section 5 Maintenance

Multiple hazards. Only qualified personnel must conduct the tasks
described in this section of the document.

No components that can be serviced by the user are in the inside of
the probe. Opening of the probe by the user leads to the loss of the
manufacturer guarantee and may cause malfunctions.

The cleanliness of the ultrasound transducer is crucial for the
accuracy of the measurement results.

The installed wiper is able to remove all impurities under normal
circumstances and if the selection of the wiper interval is not too
large (30 minutes).

If the regular check of the probe head and of the wiper (monthly)
indicates dirt, wear of the wiper rubber or a defect, then either the
probe head must be cleaned, or the wiper profile and/or the
defective part must be exchanged.

5.1 Maintenance tasks

DANGER

Take the maintenance intervals from Table 3.

Table 3 Maintenance schedule

Time interval Action

Monthly Visual inspection, if necessary, clean
Annually, at the latest after 20,000 wipe cycles Change wiper rubber

5.2 Wiper change

CAUTION

Obey the locally applicable accident prevention regulations. Wear
protective gloves where necessary during the change of the wiper
rubber.

1. Go to SENSOR SETUP > TEST / MAINT >
REPLACE

The wiper arm (refer to item 3 in Figure 12) moves for the wiper
change into a central position.

2. Remove the guide screw (refer to item 2 in Figure 12) and take
off the wiper arm.

PROFILE.

3. Pull the wiper profile (refer to item 1 in Figure 12) forward out of
the wiper arm.

4. Slide a new wiper profile with the bevel at the front into the
guide.

27

Maintenance

5. Install the wiper arm again and tighten the guide screw again

by hand.

Note: Only tighten the screw hand-tight until the safety lugs have audibly
engaged 2–3 times.

6. Select OK and the wiper arm automatically moves back to the
initial position.

Figure 12 Wiper unit

1 Wiper profile 3 Wiper arm
2 Guide screw

5.3 Cleaning tasks

Use water and a suitable brush to remove heavy contamination on
the probe or on the strut as necessary.

Clean the ultrasound transducer carefully with water and a lint-free
cloth.

28

Section 6 Troubleshooting

6.1 Operating state LED

The sensor is equipped on the top side with an LED that provides
information on the operating state.

Figure 13 Operating state LED

1 Operating state LED

Table 4 Sensor status

Green LED No errors or warnings

Green/red flashing LED

Red LED Error

LED off No device function

Probe in operation, probe position deviates strongly from the perpendicular, the
measurement value is retained, there is no error

6.2 Error messages

In the case of an error, an error message is shown on the controller.
Find error messages and notes on the resolution of the errors in

Table 5.

Table 5 Error messages

Error message Reason Resolution

The PROFILE LIST and graphic on the sc1000
is less than the programmed value for

SENSOR MEASURE

POS. UNKNOWN

AMPL DIAG Internal error Call service
MOIST Moisture value \> 10 Call service

SENSOR ANGLE

SYSTEM ERROR Faulty RAM Call service

LL THRESH.AUTO. over the entire tank depth,
or the ultrasound transducer is contaminated or
not immersed.

The wiper position is not detected. The wiper is
in the central position (after a wiper change).

Defective light barrier plate Call service

Application with particles that block the wiper.

The probe is more than 20° from perpendicular
and for longer than 180 seconds.

Incorrectly calibrated position sensor Call service

Check device data, also the plunger depth,
floor depth and advanced settings, check
installation and remove contamination.

Start a wiping process

Cleaning of the ultrasound transducer and of
the wiper system.

Check installation

29

Troubleshooting

6.3 Warnings

In the case of a warning, a warning message is shown on the
controller. Find warnings and notes on the resolution of the warning
in Table 6.

Table 6 Warnings

Warning message Reason Resolution

REPLACE PROFILE The counter for the wiper profile has expired Change wiper profile

6.4 SLUDGE DOCTOR, (diagnostic software for SONATAX sc)

SLUDGE DOCTOR is an optionally available diagnostic software
for the SONATAX sc probe in connection with the controllers sc100,
sc200 or sc1000. The software enables the representation and
saving of all graphic profiles of the SONATAX sc in a defined time
interval (5 minutes–2 hours).

The software also shows and saves all important measurement and
configuration parameters, such as the reflex list, measurement
values, limit values and all advanced settings, such as response
time, frequency, amplitude, angle and temperature.

Take further information from the SLUDGE DOCT OR user manual
DOC013.98.90411.

30

Section 7 Replacement parts and accessories

7.1 Replacement parts

Description Number Order number

SONATAX sc 1 LXV431.99.00001
1 set of replacement wiper blades out of silicone

for SONATAX/SONATAX sc probes (5 pieces)
Wiper arm 1 LZY344
Guide screw 

(for stopping the wiper arm)
User manual (xx=language code) 1 DOC023.xx.00117

7.2 Accessories

Description Order number

Pivot attachment set, 0.35 m (1.15 ft) LZX414.00.72000
Pivot attachment set, 1 m (3.3 ft) LZX414.00.71000
Rail assembly attachment set LZX414.00.73000
Tank edge attachment set LZX414.00.70000
Scraper bridge attachment set LZX414.00.74000
SONATAX sc chain stay LZX914.99.11300
SLUDGE DOCTOR, diagnostic software without interface cable LZY801.99.00000
SLUDGE DOCTOR, diagnostic software with sc200 interface cable LZY801.99.00010
SLUDGE DOCTOR, diagnostic software with sc1000 interface cable LZY801.99.00020

1LZX328

1LZY345

31

Replacement parts and accessories

32

Section 8 Warranty and liability

The manufacturer warrants that the supplied product is free of
material and manufacturing defects, and undertakes to repair or to
replace any defective parts without charge.

The warranty period is 24 months. If a maintenance contract is
taken out within 6 months of purchase, the warranty period is
extended to 60 months.

With the exclusion of further claims, the supplier is liable for
defects, including the lack of assured properties, as follows: all
parts that, within the warranty period calculated from the day of the
transfer of risk, can be demonstrated to have become unusable or
that can only be used with significant limitations owing to
circumstances prior to transfer of risk, in particular due to incorrect
design, substandard materials or inadequate finish, shall be
repaired or replaced at the supplier's discretion. The identification
of such defects must be reported to the supplier in writing as soon
as possible, but no later than 7 days after the discovery of the fault.
If the customer omits this notification, the product is considered
approved despite the defect. Further liability for indirect or direct
damages is not accepted.

If device-specific maintenance- or inspection work prescribed by
the supplier is to be performed within the guarantee period by the
customer (maintenance) or by the supplier (inspection) and these
requirements are not met, claims for damages that result from
non-observance of these requirements are void.

Further claims, in particular for consequential damages, cannot be
made valid.

Wear and damage caused by improper handling, incorrect
installation or non-designated use are excluded from this clause.

The process instruments of the manufacturer are of proven
reliability in many applications and are therefore often used in
automatic control loops to enable the most economical and efficient
operation of the relevant process.

To avoid or limit consequential damage, it is therefore
recommended that the control loop be designed such that an
instrument malfunction results in an automatic changeover to the
backup control system. This guarantees the safest operating
condition both for the environment and the process.

33

Warranty and liability

34

Section 9 Contact

HACH Company
World Headquarters

P.O. Box 389
Loveland, Colorado
80539-0389 U.S.A.
Tel (800) 227-HACH
(800) -227-4224
(U.S.A. only)
Fax [phone]
[e-mail]
www.hach.com

HACH LANGE GMBH

Willstätterstraße 11
D-40549 Düsseldorf
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.de

HACH LANGE GMBH

Rorschacherstrasse 30a
CH-9424 Rheineck
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.ch

Repair Service in the
United States:

HACH Company
Ames Service
100 Dayton Avenue
Ames, Iowa 50010
Tel [phone]
(U.S.A. only)
Fax [phone]

HACH LANGE LTD

Pacific Way
Salford
GB-Manchester, M50 1DL
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.co.uk

HACH LANGE FRANCE
S.A.S.

8, mail Barthélémy Thimonnier
Lognes
F-77437 Marne-La-Vallée
cedex 2
Tél. [phone]
Fax [phone]
[e-mail]
www.hach-lange.fr



Repair Service in Canada:

Hach Sales & Service
Canada Ltd.
1313 Border Street, Unit 34
Winnipeg, Manitoba
R3H 0X4
Tel [phone]
(Canada only)
Tel [phone]
Fax [phone]
[e-mail]

HACH LANGE LTD

Unit 1, Chestnut Road
Western Industrial Estate
IRL-Dublin 12
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.ie

HACH LANGE NV/SA

Motstraat 54
B-2800 Mechelen
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.be

Repair Service in
Latin America, the
Caribbean, the Far East,
Indian Subcontinent, Africa,
Europe, or the Middle East:

Hach Company World
Headquarters,
P.O. Box 389
Loveland, Colorado,
80539-0389 U.S.A.
Tel [phone]
Fax [phone]
[e-mail]

HACH LANGE GMBH

Hütteldorfer Str. 299/Top 6
A-1140 Wien
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.at

DR. LANGE NEDERLAND
B.V.

Laan van Westroijen 2a
NL-4003 AZ Tiel
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.nl

HACH LANGE APS

Åkandevej 21
DK-2700 Brønshøj
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.dk

HACH LANGE LDA

Av. do Forte nº8
Fracção M
P-2790-072 Carnaxide
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.pt

HACH LANGE KFT.

Vöröskereszt utca. 8-10.
H-1222 Budapest XXII. ker.

Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.hu

HACH LANGE AB

Vinthundsvägen 159A
SE-128 62 Sköndal
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.se

HACH LANGE SP. ZO.O.

ul. Krakowska 119
PL-50-428 Wrocław
Tel. [phone]
Zamówienia: [phone]
Doradztwo: [phone]
Fax [phone]
[e-mail]
www.hach-lange.pl

HACH LANGE S.R.L.

Str. Căminului nr. 3,
et. 1, ap. 1, Sector 2
RO-021741 Bucureşti
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.ro

HACH LANGE S.R.L.

Via Rossini, 1/A
I-20020 Lainate (MI)
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.it

HACH LANGE S.R.O.

Zastrčená 1278/8
CZ-141 00 Praha 4 - Chodov
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.cz

HACH LANGE

8, Kr. Sarafov str.
BG-1164 Sofia
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.bg

HACH LANGE S.L.U.

Edificio Seminario
C/Larrauri, 1C- 2ª Pl.
E-48160 Derio/Vizcaya
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.es

HACH LANGE S.R.O.

Roľnícka 21
SK-831 07 Bratislava –
Vaj nory
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.sk

HACH LANGE SU
ANALİZ SİSTEMLERİ
LTD.ŞTİ.

Ilkbahar mah. Galip Erdem
Cad. 616 Sok. No:9
TR-Oran-Çankaya/ANKARA
Tel. [phone] 
Fax [phone]
[e-mail]
www.hach-lange.com.tr

35

Contact

HACH LANGE D.O.O.

Fajfarjeva 15
SI-1230 Domžale
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.si

HACH LANGE OOO

Finlyandsky prospekt, 4A
Business Zentrum “Petrovsky
fort”, R.803
RU-194044, Sankt-Petersburg
Tel. [phone]
Fax. [phone]
[e-mail]
www.hach-lange.com

ΗΑCH LANGE E.Π.Ε.

Αυλίδος 27
GR-115 27 Αθήνα
Τηλ . [phone]
Fax [phone]
[e-mail]
www.hach-lange.gr

HACH LANGE D.O.O.

Ivana Severa bb
HR-42 000 Varaždin
Tel. [phone]
Fax [phone]
[e-mail]
www.hach-lange.hr

HACH LANGE MAROC
SARLAU

Villa 14 – Rue 2 Casa
Plaisance
Quartier Racine Extension
MA-Casablanca 20000
Tél. [phone]
Fax [phone]
[e-mail]
www.hach-lange.ma

36

Appendix A Modbus register

Table 7 Sensor Modbus register

Tag name Register # Data type Length R/W Description

SLUDGELEVEL m 40001 Float 2 R Measured sludge level in m
SLUDGELEVEL ft 40003 Float 2 R Measured sludge level in ft
SLUDGEHEIGHT m 40005 Float 2 R Measured sludge height in m
SLUDGEHEIGHT ft 40007 Float 2 R Measured sludge height in ft
PLUNGERDEPTH m 40009 Float 2 R/W Plunger depth in m
PLUNGERDEPTH ft 40011 Float 2 R/W Plunger depth in ft
BOTTOM m 40013 Float 2 R/W Tank depth in m
BOTTOM ft 40015 Float 2 R/W Tank depth in ft

SET PARAMETER 40017 Unsigned integer 1 R/W

MEAS UNITS 40018 Unsigned integer 1 R/W Dimension set: meters, feet

FACTOR 40019 Float 2 R/W

WIPE 40021 Unsigned integer 1 R/W Wiper status
ERROR 40022 String 8 R Error shown
EDITED NAME 40022 String 8 R/W Name of the measuring location
CLEAN. INTERVAL 40030 Unsigned integer 1 R/W Wiper interval
RESPONSE TIME 40031 Unsigned integer 1 R/W Response time: 10–600 seconds
FADE-OUT 40032 Unsigned integer 1 R/W Blanking: ON/OFF
BEGIN m 40033 Float 2 R/W Blanking start in m
BEGIN ft 40035 Float 2 R/W Blanking start in ft
END m 40037 Float 2 R/W Blanking end in m
END ft 40039 Float 2 R/W Blanking end in ft
LOGGER INTERVAL 40041 Unsigned integer 1 R/W Logger interval
THRESHOLD AUTO 40042 Unsigned integer 1 R/W Automatic threshold function: ON/OFF
THRESHOLD 40043 Float 2 R/W Threshold value (manual): 0.1–50
WINDOW 40045 Unsigned integer 1 R/W Window
PROFILE COUNTER 40046 Unsigned integer 1 R/W Wiper profile counter
SERIAL NUMBER 40047 String 6 R Serial number
TEST / MAINT 40053 Time2 2 R/W Date of the last maintenance
PROGRAM 40055 Float 2 R Application version
BOOTPROG. 40057 Float 2 R Boot loader version
STRUCTURE 40059 Unsigned integer 1 R Structure driver version
FIRMWARE 40060 Unsigned integer 1 R Firmware driver version
CONTENT 40061 Unsigned integer 1 R Register driver version
FormatMinSL m 40062 Float 2 R Lower sludge level limit in m
FormatMaxSL m 40064 Float 2 R Upper sludge level limit in m
FormatMinSL ft 40066 Float 2 R Lower sludge level limit in ft
FormatMaxSL ft 40068 Float 2 R Upper sludge level limit in ft
FormatMinSH m 40070 Float 2 R Lower sludge height limit in m
FormatMaxSH m 40072 Float 2 R Upper sludge height limit in m
FormatMinSH ft 40074 Float 2 R Lower sludge height limit in ft
FormatMaxSH ft 40076 Float 2 R Upper sludge height limit in ft
MOIST 40078 Unsigned integer 1 R Moisture signal

Type of measurement: sludge level,
sludge height

Correction factor for the measured value:

0.9–1.1

37

Table 7 Sensor Modbus register

Tag name Register # Data type Length R/W Description

TEMPERATURE 40079 Integer 1 R Temperature signal in °C
SENSOR ANGLE 40080 Unsigned integer 1 R Probe position signal in degrees
FREQUENCY 40081 Integer 1 R Resonance frequency signal in hertz
AMPL DIAG 40082 Integer 1 R Resonance voltage signal in volts

38