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Table of Contents
1 Scope of supply 4
2 Order numbers 4
3 Introduction 5
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 Connect power supply 13
6.2 Connecting the OTT CBS to any data logger using the S I-12 interface 13
6.3 Connecting the OTT CBS to any data logger using the RS-485 interface (S I-12 / Modbus protocol) 13
6.4 Connecting the OTT CBS to any data logger using the 4 … 20 mA interface 13
6.5 etermining the maximum load resistance at the 4 … 20 mA interface 14
7 Activating the purge function 15
8 Adjusting operating parameters using the service interface 16
8.1 Setting the serial interface type 16
8.2 Setting measurement type of the 4 … 20 mA interface to level or depth measurement 17
8.3 Scaling the measuring range for the 4 … 20 mA interface 17
8.4 Setting the measuring system for the 4 … 20 mA interface 18
8.5 Setting measurement type of the 4 … 20 mA interface to water level or pressure measurement 18
8.6 Factory setting of the operating parameters 18
9 SDI-12 commands and responses 19
9.1 Overview of S I-12 commands 19
9.2 Standard commands 21
9.3 Meta data commands 23
9.4 Advanced S I-12 commands 24
10 Carrying out maintenance work 29
10.1 Activating purge function 29
10.2 Cleaning bubble chamber 29
10.3 Testing the measuring tube 29
11 "Status" LED 30
12 ote about the disposal of old devices 30
13 Technical Data 31
Appendix A – Connecting the OTT CBS to OTT netDL or
OTT DuoSens using the SDI-12/RS-485 interface 32
Appendix B – Connecting the OTT CBS to an OTT netDL or
OTT DuoSens using the 4 … 20 mA interface 35
Appendix C – RS-485 interface with Modbus protocol (RTU) 37
Appendix D – ote on the declaration of conformity 39
