1
Introduction
1.1
Models covered
Emerson has designed the ST3 XChem electrochemical toxic gas sensors for use with the
Net Safety Millennium II Transmitter (models M21, M22, or M2B). This sensor is both
versatile and reliable, for fast, accurate, and continuous monitoring of gases in extreme
environments.
The sensor assembly consists of a factory sealed explosion proof enclosure (housing) rated
for hazardous locations and a replaceable sensor module. Only use this sensor with a Net
Safety Millennium II series transmitter. If you connect the sensor to any other model of
transmitter, it will not function, and the sensor or transmitter may be damaged.
1.2
Service support
For technical support, contact your local Emerson representative or the Technical Support
department at +1 866 347 3427 (toll free) or
.
1.3
Return of material
To expedite the repair and return of this product, proper communication between the
customer and the factory is important.
Prerequisites
Before returning a product for repair, call +1 866 347 3427 (toll free) or email
for a Return Material Authorization (RMA) number.
On the return of the equipment, include the following information:
1. RMA number provided to you by Emerson
2. Company name and contact information
3. Purchase order, from your company, authorizing repairs or request for quote
Procedure
1. Ship all equipment, prepaid to:
Emerson Automation Solutions
6021 Innovation Blvd
Shakopee, MN 55379
2. Mark all packages with
Return for Repair
and include RMA number and type of return
(e.g., return for evaluation).
Pack items to protect them from damage and use anti-static bags or aluminum-
backed cardboard as protection from electrostatic damage.
Reference Manual
Introduction
00809-0100-4303
November 2020
Net Safety ST3
7