Ntron SIL O2, User'S Operation Manual, Page: 6 / 56

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1. Introduction
The Ntron SIL O2 Analyser is a ATEX approved SIL 2 rated Oxygen measuring instrument. It contains three
programmable alarm settings, industry standard Analogue Output(active source) and a non-programmable safety
trip relay. The range of operation is 0 to 25% Oxygen. The Reasolution is to 0.01%.
Together with one of the range of Ntron ATEX approved Oxygen Sensors, it forms a SIL2 rated measurement
unit which can operate on its own or as part of a larger installation.
Note. Non-Atex (Ex) Sensors variants of the models listed in the manual may also be used with the SIL O2
Analyser as long as they are installed in a Non-ATEX (Ex) or ‚Safe‘ area or zone.
The Alarm settings are typically factory set according to the end user’s requirements. Interface software and
hardware is available for the user to perform such functions themselves. Contact Ntron for further details.
1.1 The purpose of this User and Operation Manual
This Manual is limited to providing the user with necessary details on installation, interface wiring, operation
and maintenance of the SIL O2 Analyser and Oxygen Sensor, to ensure safe and reliable operation of this
Analyser and Sensor unit.
Note: This manual does not cover the design or application of a safety Instrumented System (SIS) into
which the SIL O2 Analyser unit may be incorporated. Further details of this can be obtained in the Ntron
SILO2 Technical and Safety Manual.
Increase (UP) and
Decrease (Down)
Pushbuttons. Pressing
simultaneously enables
entry into the
calibration mode.
Power, Error/Fault and
Alarm Level indicators
RS232
Communications
connection
The main user interface features
4-Digit LCD
Display/Readout