3
Table of contents
1 Scope of Supply 4
2 Order Numbers 4
3 Basic safety instructions 5
4 Introduction 6
5 Installing the pressure probe 8
5.1 Installation type A: fixing the pressure probe into a protective device 8
5.2 Installation type B: hanging pressure probe 9
5.3 Connecting humidity absorbing system 10
5.4 Wire assignment of the pressure probe cable 10
5.5 Connecting the OTT PLS to any datalogger using an SDI-12 interface 11
5.6 Connecting the OTT PLS to any datalogger using a 4 … 20 mA interface 11
5.7 Determining the maximum load resistance at the 4 … 20 mA interface 11
5.8 Note on using the 4 … 20 mA interface 12
5.9 Note on using the RS-485 interface 12
6 SDI-12 Commands and Responses 13
6.1 Standard commands
13
6.2 Advanced SDI-12 commands
15
7 Carrying out maintenance work 20
8 Searching for disruptions/troubleshooting 21
9 Repair 22
10 Note about the disposal of old units 22
11 Technical Data 23
Appendix A – Connecting the OTT PLS to the OTT netDL or OTT DuoSens
datalogger using an SDI-12 or RS-485 interface 25
Appendix B – Connecting the OTT PLS to the OTT netDL or OTT DuoSens
datalogger using a 4 … 20 mA interface 28
Appendix C – Installing the OTT FAD 5 humidity absorbing system 30
Appendix D – Installing the OTT FAD 4PF humidity absorbing system 32
Appendix E – Note on Declaration of conformity 33
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