OTT Kalesto User manual
Operating Instructions
Radar Sensor
Kalesto
English
OTT 0051B
2
Twisted pair cable
up to max. 1,000 m
A separate voltage supply
is required for the radar sensor
if cables exceed a certain
length; see Technical Data
(use commercially-available
distributor socket)
123456
1 RS 485 A
2 RS 485 B
3 n.c.
4 n.c.
5 n.c.
6 n.c.
OTT-LOG connection diagram
Kalesto input card
Voltage supply
±5˚
Connection diagram
Adjust the positioning mechanism
so that the radar sensor is aligned
at right angles to the water surface.
(Check with a spirit-level.)
Distance between radar/ Safety distance between
sensor water surface buildings and centre axis
5 m 0.5 m
10 m 1 m
20 m 2 m
30 m 3 m
3
RS 485 B
RS 485 A Ground
+12 V DC
Opening the connection section on the
Kalesto radar sensor (captive screws).
Connecting the twisted pair
cable to the radar sensor.
4
Setting the OTT-LOG operating matrix for a Kalesto
radar sensor
Field 15 Enter scaling + point position; create relation to reference point
100% + 0% =
Adjusts the OTT-LOG to the Kalesto radar sensor measurement range.
POINT POS = Sets the decimal point position within the measured value
The Kalesto radar sensor measures the distance from the bottom of its housing* to
the water surface: the maximum measured value is 30.00 m. The measurement
result for distance or level measurement is scaled by entering a value in the 0 %
and 100 % boxes in field 15 of the OTT-LOG operating matrix.
* Please note that the measurement zero point is initially positioned some centimetres
inside the sensor housing. After scaling with relation to a reference point, you can
check the result of all subsequent measurements (housing bottom/water surface)
using an electric contact gauge, for example.
Scaling for water level measurements (with relation to reference point)
Carry out measurement using the settings 100 % = 0.00; 0 % = 30.00
(result in matrix field 10).
Determine the reference value using a staff gauge, for example.
Calculate: Correction value = Displayed value – staff gauge value
Enter scaling/comma position
→ New 100 % value = 0.00 – correction value
→ New 0 % value = 30.00 – correction value
Important: Do not forget the sign!
Example: Display in field 10 = 18.50
Staff gauge reference value = 1.15
Correction value = 17.35
→New 100 % value = –17.35
→New 0 % value = 12.65
15± SCALING
100% 0.00
0% 30.00
POINT POS xxx.xx
5
Scaling for distance measurements (depth of water)
(radar sensor ↔water surface with relation to a reference point)
Perform measurement using the settings 100 % = 30.00; 0 % = 0.00
(result in matrix field 10).
Determine the reference value using an electric contact gauge, for example.
Calculate: Correction value = Displayed value – electric contact gauge value
Enter scaling/comma position
→ New 100 % value = 30.00 – correction value
→ New 0 % value = 0.00 – correction value
Important: Do not forget the sign!
Enter scaling/decimal point position:
†
™® Select digit position; ∑« Select sign/digits
†
™® Select digit position; ∑« Select sign/digits
†
∑« Select decimal point position
Factory setting: 100% =0.00;
0% =30.00;
POINT POS = xxx.xx
– Possible decimal point positions: xxx.xx → Resolution 1 cm
xx.xxx → Resolution 1 mm *
xxx.xx → Resolution 0.01ft
– Do not forget the sign in all entries!
– The decimal point position also affects the matrix fields 10, 11, 14, 15,
16 and 18.
– For a resolution in 0.01 ft: Use 98.43 instead of 30.00 (30 m = 98.43 ft)
* For distance measurements: possible using OTT-LOG version V2.16 and later
versions (100 % value, 0 % value: max. ±29.999 m)
6
Operating mode „surface velocity“
This operating mode of the Kalesto is provided for the approach determination of the
surface velocity of a river.
Please note: The accuracy of measured values depends on the roughness of water
surface. Strong wind influences or very smooth water surfaces falsify measuring
results.
Special input card for OTT-LOG necessary: 55.505.138.3.2
Min. surface velocity vmin = 1 m/s
The actual velocity of the river is larger than the measured velocity of the KALESTO:
v = v Kalesto/ cos a
For this reason it is necessary to enter a correction value in the 100 % field of the
matrix. Through this the OTT-LOG calculates the resulting velocity automatically.
Scaling for surface velocity
Determine the value for 100 % from the table.
Enter 100 % and 0 % value; e. g. α= 45 °
→ 100 % value = 42.43
→ 0 % value = 0.00
The OTT-LOG displays the measured value in m/s.
α
Flow direction
h
Radar Sensor Kalesto: Operating
mode „surface velocity“
7
Angle 100 % value hmin hmax
(field 10) approx. approx.
30 °34.64 1.00 m 10.5 m
35 °36.62 1.10 m 12.0 m
40 °39.16 1.25 m 13.5 m
45 °42.43 1.40 m 15.0 m
50 °46.67 1.50 m 16.0 m
55 °52.30 1.60 m 17.0 m
60 °60.00 1.70 m 18.0 m
(Point position: xxx.xx)
Document number
63.100.000.B.E 06-1100
Technical data
Measurement range 1.5 …30 m
Resolution 1 mm
Maximum measurement error1) ±1 cm + 1 digit
Operating voltage 9 …15 V DC
Current consumption
–Active 550 mA
–Standby mode < 1µA
Interface RS 485; max. 1,000 m twisted pair cable
Transmission speed 9,600 bit/s
Microwave frequency 24.125 GHz
Transmission output 5 mW
Radiation angle ±5°
Length of measurement cycle 17 s
Measured value output 17 s after measured value request
When the device is combined with an
OTT-LOG data logger in the HYDROSENS
“MIDI”housing, operation and measured
value readings are performed using the
OTT-LOG operating matrix.
Degree of protection IP 68
Insertable cable e. g. Li2YCYv (TP) 2 x 2 x 0.5 mm2
Filling Nitrogen; 0.5 bar overpressure
Authorisation number D810117L
Dimensions L x Diam. approx. 500 mm x 160 mm
Weight approx. 8.0 kg
Temperature range –40 to +85 °C
1) under reference conditions
A separate voltage supply is required for the Kalesto radar sensor if
cables exceed a certain length (voltage reduction in twisted pair cable):
Wire cross-section Max. cable length for voltage supply
in mm212 V 15 V
0.5 35 m 100 m
1.0 70 m 200 m
1.5 110 m 300 m
OTT MESSTECHNIK GmbH & Co. KG
P.O. Box 2140 ⋅D-87411 Kempten
Ludwigstrasse 16 ⋅D-87437 Kempten
Phone ++49(0)8 31 56 17-0
Fax ++49(0)8 31 56 17-2 09
E-mail: info@ott-hydrometry.de
Internet: http://www.ott-hydrometry.de
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