OTT CBS Manual de usuario
English
Operating instructions
Bubble Sensor OTT CBS
We reserve the right to make technical changes and improvements without notice.
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Table of Contents
1 Scope of supply 4
2 Order numbers 4
3 Introduction 5
3.1 Function 6
3.2 Status LED 6
4 Installing OTT CBS 7
4.1 Preparing the OTT CBS for installation 7
4.2 Fastening OTT CBS 7
4.3 Connecting measuring tube to OTT CBS 8
5 Installing bubble chamber 9
5.1 Installing bubble chamber for surface water 9
5.2 Installing bubble chamber for ground water 10
6 Connecting OTT CBS 12
6.1 Connecting power supply 13
6.2 Connecting the OTT CBS to any datalogger using an SDI-12 interface 13
6.3 Connecting the OTT CBS to any datalogger using a 4 … 20 mA interface 13
6.4 Connecting the OTT CBS to LogoSens 2 or DuoSens using an SDI-12 interface 14
6.5 Connecting the OTT CBS to LogoSens 2 or DuoSens using a 4 … 20 mA interface 16
7 Activating the purge function 18
8 Setting operating parameters using DIP switches 19
8.1 Setting the type of SDI-12 interface 19
8.2 Setting measurement type of the 4 … 20 mA interface to level or depth measurement 20
8.3 Scaling the measuring range for the 4 … 20 mA interface 20
8.4 Setting the measuring system for the 4 … 20 mA interface 21
8.5 Setting measurement type of the 4 … 20 mA interface to water 21
level or pressure measurement
8.6 Factory setting of the operating parameters 21
9 SDI-12 Commands and Response 22
9.1 Standard commands 22
9.2 Advanced SDI-12 commands 23
10 Determining the maximum load resistance at the 24
4 … 20 mA interface
11 Carrying out maintenance work 25
11.1 Activating purge function 25
11.2 Cleaning bubble chamber 25
11.3 Testing measuring tube 25
12
Status
LED 26
13 Note about the disposal of old devices 26
14 Technical Data 27
1 Scope of supply
䊳OTT CBS –1 Bubble Sensor OTT CBS with possibility for connecting measuring tubes with
4 mm/2 mm external/internal diameter
–1 Installation kit (top hat rail with fastening parts; screw terminal blocks, pin jumpers)
–1 Operating Instructions
2 Order numbers
䊳OTT CBS Bubble Sensor OTT CBS 63.200.001.9.2
䊳Accessories Measuring tube
4 mm/2 mm external/internal diameter; transparent PE
– 50 m 99.420.050.9.5
– 100 m 99.420.100.9.5
Combined measuring tube/
bubble chamber suspension cable
black, with kevlar core for length stabilization, measuring tube
with 4 mm/2 mm external/internal diameter; transparent PE
– 50 m 99.420.009.9.5
– 100 m 99.420.008.9.5
Measuring tube
6 mm/4 mm with sheathing
Length as requested 20.500.133.5.5
Measuring tube
6 mm/4 mm without sheathing
Length as requested 20.500.302.5.5
Bubble chamber suspension cable
black, with Kevlar core for length stabilization
– 50 m 99.000.050.9.5
– 100 m 99.000.100.9.5
Bubble chamber for ground water
– for observation wells beginning at 2" diameter, 670 gram 55.510.051.4.2
Bubble Pot EPS 50
for surface water
– hose connector 4 mm/2 mm 55.510.048.3.2
– hose connector 6 mm/4 mm 55.510.049.3.2
Straight pipe fitting
– for connecting measuring tubes with 63.200.025.9.2
1/8" internal diameter and 3/8" external diameter
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3 Introduction
The OTT CBS, working on the air bubble principle, can be used for measuring
ground water or water levels depending on the bubble chamber used.
To meet the various demands of the station, three different versions of the OTT
CBS bubble sensor are available:
Standard
version:
䊳Measuring range 0 … 15 m or 0 … 1500 mbar
䊳Resolution 1 mm or 0.1 mbar
䊳Accuracy ±5 mm
USGS specification
version:
䊳Measuring range 0 … 15 m or 0 … 1500 mbar
䊳Resolution 1 mm or 0.1 mbar
䊳Accuracy measuring range 0 … 15 ft: ±0.01 ft
measuring range 15 … 50 ft: ±0.065 % of measured value
or ±0.02 ft, whichever is less
30 m measuring range
version:
䊳Measuring range 0 … 30 m or 0 … 3000 mbar
䊳Resolution 1 mm or 0.1 mbar
䊳Accuracy ±5 mm
The compressed air produced by a piston pump flows via a measuring tube and
the bubble chamber into the water to be measured. The pressure created in the
measuring tube is directly proportional to the water column above the bubble
chamber. The OTT CBS determines the barometric air and bubble pressure one
after the other. By taking the difference between the two signals, the OTT CBS
calculates the height of the water level above the bubble chamber.
The power supply can be provided from a mains adapter, battery or solar power.
The OTT CBS contains a purge function. This clears the measuring tube and the
bubble chamber of any minor contamination by pumping a large volume of air
into the measuring tube.
By using an intelligent pump strategy, no air drying unit is necessary for the
measuring range of 0 … 15 m.
Hose connection
for measuring tube
Air filter for
incoming air
DIP switch compartment
Status LED
Buttonfor activating
the purge unit
Terminal blocks A and B
for connecting the datalogger
and power supply
Fig. 1: Overview of OTT CBS.
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For the display of any error states that may occur, the OTT CBS has a
Status
LED
(see Fig. 1).
Various operating parameters can be set using the eight DIP switches.
Bubble pot
EPS 50
Groundwater
bubble chamber
Measuring tube
Fig. 2: The main layout of a level
station with OTT CBS bubble sensor.
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4 Installing OTT CBS
4.1 Preparing the OTT CBS for installation
䡵If necessary and you have not already done so: set operating parameters with
DIP switches (see Chapter 8).
4.2 Fastening OTT CBS
The OTT CBS is designed only to be installed on top hat rails (a section of top hat
rail is supplied with the OTT CBS). Choose a dry and dust free location for the
installation such as a gage station or control cabinet.
䡵First attach the OTT CBS on the upper edge of the top hat rail and then press
the underside against the top hat rail until it clicks into place.
Demounting OTT CBS
䡵First press one locking device downwards and pull the OTT CBS slightly for-
wards at this point. Press the second locking device downwards and remove
the OTT CBS upwards from the top hat rail.
Top hat rails Locking device
Fig. 3: Fastening the CBS on the top
hat rail (left)/demounting (right).
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4.3 Connecting measuring tube to OTT CBS
To install the measuring tube on the OTT CBS, proceed as follows:
Measuring tube with 2 mm internal diameter
䡵Cut off the end of the measuring tube square with a sharp knife and push onto
the factory fitted connection nipple.
Maximum length of the measuring tube: 100 m.
Measuring tube with 4 mm internal diameter
䡵Cut off the end of the measuring tube square with a sharp knife.
䡵Remove cap nut (width across flats: 10) and pull off the (short) factory mounted
measuring tube from the connection nozzle.
䡵Push cap nut over the measuring tube (Ø 4 mm).
䡵Push measuring tube onto the connection nozzle.
䡵Push the cap nut back onto the connection nozzle and tighten by hand.
Maximum length of the measuring tube: 75 m.
Measuring tube with 1/8" internal diameter
A special pipe fitting for the 1/8" internal diameter measuring tube is available
(accessory). Please follow the instructions delivered with the pipe fitting for
installing the pipe.
Maximum length of the measuring tube: 100 m.
Pump
Cap nut
Connection
nozzle
Measuring tube
Ø: 4 mm
1.
2.
Connectionnipple
Measuring tube
Ø: 2 mm
Fig. 4: Connecting measuring
tube on OTT CBS.
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5 Installing bubble chamber
Please ensure the following points are noted during installation:
䊳No contamination or moisture may be allowed into the measuring tube.
䊳When immersing the bubble chamber (only EPS 50), the OTT CBS must be
activated, so that the piston pump is operating during this process.
䊳Do not damage or kink the measuring tube during installation.
䊳Lay the measuring tube such that there is a continuous drop from the OTT CBS
towards the bubble chamber. Otherwise moisture could collect in a
hollow
and
potentially block the tube with the formation of drops (see Fig. 5)
5.1 Installing bubble chamber for surface water
We recommend using the
Bubble Pot EPS 50
for measurements in surface waters.
See
Bubble Pot EPS 50
installation instructions for information on its installation.
1"metal tube
Directionofflow
"Bubble pot
EPS 50"
Measuring tube
Fig. 5: Routing requirements
for measuring tube.
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5.2 Installing bubble chamber for ground water
To install the bubble chamber for ground water, proceed as follows:
䡵Determine depth of the bubble chamber (e.g. using a contact gauge). The
bubble chamber must be positioned under the lowest expected water level.
Depth = distance from bubble opening to upper edge of the
top cap
䡵Push the measuring tube into the cable gland of the bubble chamber as far as
it goes.
䡵Tighten the cable gland firmly by hand
䡵Cut suspension cable to length; suspension cable length = depth +
125 cm (to protect the suspension cable from being twisted off, it can be
melted, with a cigarette lighter for example).
䡵Feed the suspension cable through the hole in the bubble chamber as shown in
Figure 6 and tie firmly.
䡵Slide cover into position B (upwards), see Fig. 6.
Measuring pipe
Suspensioncable
bubble chamber
Metal pin
Cover in
positionA
Bubble openingCover in
positionB
Cable
gland
Hole
Bubble pot
Fig. 6: Installing bubble
chamber for ground water.
When lowering the bubble chamber, the
cover must be in position B! The cover
prevents water entering the measuring
tube during installation.
During initial startup, over pressure builds
up in the measuring tube. As a result, the
cover falls back to position A and opens the
measuring tube in the process.
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