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Summary of Contents for OTT CBS
- Page 1 Operating instructions Bubble Sensor OTT CBS...
- Page 2 We reserve the right to make technical changes and improvements without notice.
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Page 3: Table Of Contents
6.3 Connecting the OTT CBS to any datalogger using a 4 … 20 mA interface 6.4 Connecting the OTT CBS to LogoSens 2 or DuoSens using an SDI-12 interface 6.5 Connecting the OTT CBS to LogoSens 2 or DuoSens using a 4 … 20 mA interface 7 Activating the purge function 8 Setting operating parameters using DIP switches 8.1 Setting the type of SDI-12 interface... -
Page 4: Scope Of Supply
1 Scope of supply 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... -
Page 5: Introduction
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... -
Page 6: Function
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. Fig. 2: The main layout of a level station with OTT CBS bubble sensor. -
Page 7: Installing Ott Cbs
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. -
Page 8: Connecting Measuring Tube To Ott Cbs
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 Cut off the end of the measuring tube square with a sharp knife and push onto the factory fitted connection nipple. -
Page 9: Installing Bubble Chamber
Do not damage or kink the measuring tube during installation. 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. -
Page 10: Installing Bubble Chamber For Ground Water
5.2 Installing bubble chamber for ground water To install the bubble chamber for ground water, proceed as follows: 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 Push the measuring tube into the cable gland of the bubble chamber as far as... - Page 11 As shown in Fig. 7, attach the suspension cable of the bubble chamber to the retainer on an OTT top cap already mounted. The retaining plate allows a fine height adjustment afterwards. Secure the suspension cable against slipping with a knot.
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Page 12: Connecting Ott Cbs
(U + GND). The three interfaces make it possible to connect the OTT CBS both to OTT data- loggers and to any datalogger by another manufacturer that has the correct inter- faces. The SDI-12 interface meets SDI-12 Standard 1.3 (SDI-12 = Serial-Digital Interface with 1200 baud). -
Page 13: Connecting Power Supply
6.1 Connect power supply The OTT CBS requires a power supply of 10 … 30 V DC, typ. 12/24 V DC (e.g. using batteries or mains connection with galvanically separated low safety voltage). Please note the following points when dimensioning the power supply: Maximum power consumption per day: 3700 mAh (typ. -
Page 14: Connecting The Ott Cbs To Logosens 2 Or Duosens Using An Sdi-12 Interface
SDI-12). The maximum length of the cable is 70 m. Recommended cable cross-section: 0.25 mm Connect the OTT CBS as shown in Figure 9 to the LogoSens 2 Station Manager or to the DuoSens Compact Data Logger. Take note of the operating instructions for the LogoSens 2/DuoSens. - Page 15 (m: 3; cm: 0; ft: 3; mbar: 1; psi: 3; °C: 1; status: 0). Note: To record all seven values of an OTT CBS, seven channels in the LogoSens 2/DuoSens are necessary. The first channel contains the function block SDI-12 Master or OTT SDI RS485 as the input signal.
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Page 16: Connecting The Ott Cbs To Logosens 2 Or Duosens Using A 4
6.5 Connecting the OTT CBS to LogoSens 2 or DuoSens using a 4 … 20 mA interface Connect the OTT CBS to the LogoSens 2 Station Manager or to the DuoSens Compact Data Logger as shown in Figure 12. Take note of the operating instructions for the LogoSens 2/DuoSens. - Page 17 Insert a function block 2-Point scaling into this channel and set the appropriate water levels for the electrical values measured (e. g. for an OTT CBS with 15 m measuring range and level measurement (DIP switches 5 + 6 = ON): Point 1: 4 →...
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Page 18: Activating The Purge Function
7 Activating the purge function On the front of the OTT CBS there is a Pump membrane button (see Fig. 14). Pressing the button activates the purge function for as long as it is pressed. The Status LED lights for approx. 2 seconds. With an activated purge function, the CBS pumps a large amount of air through the measuring tube for the required time period (see also Chapter 11). -
Page 19: Setting Operating Parameters Using Dip Switches
8.1 Setting the type of SDI-12 interface With DIP 1 … 3 select the type of SDI-12 interface of the OTT CBS (screw terminal strip B; contacts 1 to 4). Please also take note that only one of the interfaces can be used in each case: 4 …... -
Page 20: Setting Measurement Type Of The 4
With DIPs 5 and 6 you can scale the available measuring range (15 or 30 m) of an OTT CBS to a smaller range. Where the whole measuring range is not required, this has the advantage that a higher resolution for the 4 … 20 mA interface can be achieved. -
Page 21: Setting The Measuring System For The 4
8.4 Setting the measuring system for the 4 … 20 mA interface Fig. 18: Setting the measuring system of the OTT CBS (4 … 20 mA interface). 1 2 3 4 5 6 Metric measurement system: m + mbar 1 2 3 4 5 6 Imperial measurement system: feet + psi 8.5 Setting measurement type of the 4 …... -
Page 22: Sdi-12 Commands And Response
9 SDI-12 Commands and Response 9.1 Standard commands The following SDI-12 standard commands are implemented in the OTT CBS: Command Response Description Acknowledge active a<CR><LF> Send Identification allccccccccmmmmmm… OTT CBS Response = 13OTT HACH CBS107 …vvvxxxx<CR><LF> Change Address aAb! b<CR><LF>... -
Page 23: Advanced Sdi-12 Commands
–6 The OTT CBS can calculate the water density at any time using the value for the local water temperature. You can enter the value for the local gravitational constant using the command aOXG<value>! and the value for the local water temperature using the command aOXT<value>!. -
Page 24: Determining The Maximum Load Resistance At The
The load resistance connected to the OTT CBS must not exceed a specific maxi- mum value. This value depends on the level of the supply voltage of the OTT CBS. If the load resistance is greater, the output current can no longer be evaluated. -
Page 25: Carrying Out Maintenance Work
After 15 years' operation, test the measuring tube for tightness/pressure resis- tance roughly every 2 years. Never open the housing of the OTT CBS! There are no adjustment or control elements inside the housing! In the case of device defects, contact the OTT Repaircenter: OTT MESSTECHNIK GmbH &... -
Page 26: Status Led
12 Status LED For the display of any error states that may occur, the OTT CBS has a Status LED on the front of the device (see Fig. 1). The following error states can arise: level too low (< 5 cm) -
Page 27: Technical Data
14 Technical Data Measuring ranges Standard + USGS specification version 0 … 15 m or 0 … 1500 mbar 0 … 50 ft or 0 … 25 psi 30 m measuring range version 0 … 30 m or 0 … 3000 mbar 0 …... - Page 28 OTT MESSTECHNIK GmbH & Co. KG Ludwigstrasse 16 ⋅ 87437 Kempten Germany Phone +49 (0)8 31 56 17- 0 +49 (0)8 31 56 17- 2 09 Document number info@ott-hydrometry.com 63.200.001.B.E 03-0207 www.ott-hydrometry.com...
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