Hydrological Sensors

water level - temperature

the adequate solution for all gauging

l Flexible measuring methods with bubbler-, float driven-,

PS-Light 2 Sensor
radar-systems or pressure sensor
depending on the field of application
l Low power consumption
l Customer friendly installation and handling

Radar Sensor SEBAPuls 8/15/20/120

LevelSense

Pressure sensor DS-22

Pressure and temperature
sensor DST-22

water level measurement

with pressure sensor

radar bracket
PS-Light-2 station
water level measurement radar sensor

www.seba.de B20_Hydrologmesswertg_e_S1-4 15.03.2019

Hydrological Sensors

SEBA HYDROMETRIE monitoring equipment - including hydrological sensor systems - have proven their
reliability and quality for over 50 years in more than 140 countries.
Altogether, four different hydrological sensor systems can be deployed in order to obtain reliable surface
water level data:
1.Pressure Sensor:
The sensor is installed below the surface water level recording the hydrostatic pressure.

2. Surfloat Sensor 2:
The surfloat-sensor is based on the float mechanism principle which consists of a float and counterweight
(floating on the surface water level) and a digital surface water level logger.

3. PS-Light-2 Sensor:
The sensor measures the corresponding hydrostatic pressure through a pressure tube and a highly sensitive
sensor.

4. Radar Sensor:
The radar sensor represents a contactfree, undisturbed surface water level measurement using the runtime
of an emitted radar sensor impulse.

Pressure Sensor type DS-22

For water level measurement in groundwater (aquifer), surface water, water tanks or water reservoires etc.

Technical data
output : 0 to 1 V 0/4 to 20 mA RS485 SDI-12
(extended ESD protection according to IEC 61000-4 part 5) (SHWP/Modbus)
ranges: 0 to 2m 0to 2 m 0 to 2 m 0 to 2m
0 to 10 m 0 to 10 m 0 to 10 m 0 to 10 m
0 to 20 m 0to 20 m 0 to 20 m 0 to 20 m
0 to 40 m 0to 40 m 0 to 40 m 0 to 40 m
0 to 100 m 0to 100 m 0 to 100 m 0 to 100 m
0 to 200 m 0to 200 m 0 to 200 m 0 to 200 m
0 to 300 m 0to 300 m 0 to 300 m 0 to 300 m
other ranges on request
accuracy: ± 0.1% (at 25°C) ± 0.1% (at 25°C) ± 0.05% (at 25°C) ± 0.05% (at 25°C)
operation
temperature: -5°C to +60°C -5°C to +60°C -5°C to +60°C -5°C to +60°C
power supply: 7 - 30V DC stabilized 7 - 30V DC stabilized 9 - 35V DC stabilized 9 - 35V DC stabilized
material: stainless steel stainless steel stainless steel stainless steel
dimensions: Ø 22 mm Ø 22 mm Ø 22 mm Ø 22 mm
length 182 mm length 182 mm length 182 mm length 182 mm
cable: multicore transmission cable, screened with atmospheric pressure compensation tube

Pressure / Temperature Sensor type DST-22

Combined water level and temperature sensor for the acquisition of both parameters with only one sensor.
Signals are transferred via one single cable only.

Technical data:
outputs: 2 channels 0-1V, 4-20mA
RS485 with SHWP/Modbus protocol, SDI-12
water level: see DS-22
temperature
measuring range: -5°C to +50°C (RS485)
-5°C to +60°C (0-1V, 4-20 mA)
accuracy: 0,1°C
 Angle encoder Levelsense

The newly developed SEBA LevelSense is a rugged angle encoder for aquisition of water level data, which works
completely slip-free with approved ball-chain and float/counterweight system. This device is suitable for subsequent
adaption to all conventional float-operated measuring instruments, like SEBA Strip Chart Recorder Delta, XI Horizontal
Water Level Recorder etc.

The SEBA LevelSense is standardly equipped with LC-display and RS232-interface for configuration, available output
formats are analog U/I, SDI-12 and RS485. This device provides customer friendly handling: if the LC display is
activated and if the float-wheel is turned simultaneously, the desired measuring value can be adjusted by the
customer. The instrument is operated by an external power supply of typ. 12 V, in case of power blackout a 9 V battery
serves as a back up system and emergency supply.

Technical Data:

Dimensions 143 x 85 x 38 mm (l x w x h)
External power supply: 9 ... 15 V (typ. 12 V) required with supplied sensors
D/A-converter: 14 bit
Flash-controller: 3R2C 32 bit with integrated watchdog
Display: 3 lines, each 16 characters, 3.65 mm
Serial interface: RS232
Operating temperature: -30°C to +70°C
Inputs: up/down-counter, encoder input, impuls (rain)
2 contact inputs (control, recording) LevelSense
Outputs: 1 analog output for norm signals
analog U/I, SDI-12, Modbus, RS485
Housing material: aluminium
Protection class: IP 65
Weight: ca. 0,25 kg

Pressure sensor pneumatic gauge type PS-Light-2

The SEBA pneumatic gauge type PS-Light-2 is a robust, reliable and economic measuring system for monitoring
water level in surface waters. The measuring principle is based on a version of the bubbler system, well-known and
proven by the other SEBA instruments of the PS-series.
At adjustable intervals an integrated, highly efficient mini compressor bubbles air through the pressure tube into the
water. The pressure generated in the tube corresponds exactly to the hydrostatic pressure above the mouthpiece. This
tube pressure is measured by a high-precision pressure sensor inside the PS-Light-2.

Technical data:
Accuracy: <0.05 % of the measuring range PS-Light-2 with
(<1 cm at 10 m measuring range) mobile modem
Measuring ranges: 0 to 10 m, 0 to 15 m, 0..20 m, 0..40 m, 0..70 m
Operating temperature: -20°C to +50°C
Output: optional 1 from 7, 0..1 V, 0..5 V, RS232, 0/4 to 20 mA, BCD-Code, Binary-Code, Gray-Code
Measuring interval: 1, 2, 5, 15, 30, 60, 120 or 180 minute(s), by an internal activation in the PS-Light
resp. free programmable (from two minutes) in combination with SEBA data loggers

PS-Light -2-Sensor PS-Light-2-Sensor-LCD PS-Light - 2 - 3G+

consisting of: consisting of: same as PS-Light-2 Sensor but
l high-precision pressure sensor l PS-Light sensor additionally with:
for water level measurement l LC display for digital indication
l mini compressor of the current measuring data — Data Logger
l output: analogue and digital
with RS232 interface
l plastic protection box
— LC-Display for digital indication
of current water level
PS-Light-2 (- Logger) PS-Light-2 (- Logger)-LCD: — with integrated mobile modem
consisting of: consisting of: — for online- and offline operation
l PS-Light sensor l PS-Light
l Data logger with an l LC Display for digital indication
RS232 interface for on- and offline of the current measuring data
operation

All PS-Light systems can be upgraded with mobile modem

 Radar sensor types SEBAPuls 8 / 15 / 20 / 120

The SEBAPuls radar sensor is designed for operation at rivers, channels, dams, lakes and tidal areas monitoring
the surface water level implementing the contactfree radar principle.

Key Benefits

l unaffected by mudding, drifting materials, weedage, aggressive media

(sewage, brackish or saline water etc.)
l low cost and time efficient installation (i.e. setup of bridge jibs);
l no disturbance of general hydraulic
l no influence of measurement accuracy by air humidity (fog) or by
high air temperature fluctuations
l low power consumption
l short measuring interval
l minimum distance from antenna end: 50 mm
l small mounting distance (approx. 20 to 30 cm)

The basic version of this measuring equipment consists of a sensor with an analogue output (4...20mA).
A modular concept of the SEBAPuls sensor enables the installation of an additional data storage unit (e.g SEBA
Data logger ) and a remote data transmission system via mobile modem, Satellite or landline.

Measuring principle - Pulse radar

The "pulse radar" measuring method emitts a short microwave impulse to the water surface followed by a short
time lag of the transmitter. Within this time lag, the radar receives the reflected impulse from the water surface
and transmits it to the integrated evaluation system. The run time of the impulse corresponds directly to the
distance of the actual surface water level.

Technical data
Housing Material:
Dimension SEBAPULS 8: Ø 93mm, length 243mm Synthetic or Aluminium housing, IP68
Dimension SEBAPULS 15: Ø 116mm, length 300mm Horn antenna made of Synthetic
Dimension SEBAPULS 20: Ø 116mm, length 245mm
Dimension SEBAPULS 120: Ø 116mm, length 245mm Weight:
approx. 2kg

Registration of SEBAPuls 8: SEBAPuls 15: SEBAPuls 20: SEBAPuls 120:

measuring values:
Accuracy: ± 5 mm ± 2mm ± 2mm ± 5mm
Measuring range: 0-8m 0 - 15m 0 - 35m 0 - 120m
Operation temperature (all types): -40°C up to 80°C
Output (all types): 4 up to 20mA or 0.4 up to 2V (optional: SDI-12)

Transmission of measuring values to PC

Offline: manual data readout with SEBA Data logger
Online: remote data transmission via mobile
modem (e.g. FTP-Push or SMS-Push)

Power supply
245
300

245
243

Battery: 12V or 24V

Solarpanel: incl. charger and buffer
accumulator
Mains adapter: 220VAC/12VDC/24VDC
SEBAPULS 8 SEBAPULS 15 SEBAPULS 20 SEBAPULS 120

The right is reserved to change or amend the foregoing technical specification without prior notice.

SEBA Hydrometrie GmbH & Co. KG represented by:

Gewerbestr. 61a • 87600 Kaufbeuren • Germany
Phone: +49 (0)8341 / 9648-0
Fax: +49 (0)8341 / 9648-48
E-Mail: info@seba.de
Internet: www.seba.de

Photos: © SEBA Hydrometrie GmbH, Pixelio.de