Table of Contents
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SARAD GmbH
Content
Important Hint ......................................................................................................................................... 3
Theory of Operation ................................................................................................................................ 3
Operating the Instrument ....................................................................................................................... 5
Power supply ....................................................................................................................................... 5
Input Filter ........................................................................................................................................... 5
Carrying out a measurement............................................................................................................... 5
Adjustment of the sampling interval ................................................................................................... 7
Operation Modes ................................................................................................................................ 7
Pump ............................................................................................................................................... 7
Alarm ............................................................................................................................................... 7
Fast/Slow Mode ............................................................................................................................... 7
Sniffing ............................................................................................................................................. 7
Data Handling ...................................................................................................................................... 7
Data Storage .................................................................................................................................... 7
Printing a protocol ........................................................................................................................... 8
Data transfer.................................................................................................................................... 9
Version RTM1688-2 MODBUS ............................................................................................................... 10
General information .......................................................................................................................... 10
Selection of the transfer protocol, Addressing ................................................................................. 10
Implemented MODBUS functions ..................................................................................................... 10
RTM1688-2 GEO Version ....................................................................................................................... 12
Power Supply ..................................................................................................................................... 12
Optional GSM Modem....................................................................................................................... 12
Connection of the Soil Gas Probe ...................................................................................................... 13
Specifications differing from the Standard Version .......................................................................... 13
Statistical Error (for non-mathematicians) ............................................................................................ 13
Error Prediction ................................................................................................................................. 14
Detection Limit .................................................................................................................................. 16
Disposal instructions ............................................................................................................................. 17
Technical Data ....................................................................................................................................... 18
User Manual RTM1688-2 06-02-2019.docx
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Table of Contents
