Emerson Rosemount 490A Quick Start Manual

Optical dissolved oxygen sensor

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Rosemount 490A

Optical Dissolved Oxygen Sensor

Quick Start Guide

MS-00825-0100-3490, Rev AB

February 2025

Table of Contents

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Page 1 MS-00825-0100-3490, Rev AB February 2025 If QR code is not affixed here, product documents can be located by entering your product's S/N into the search tool (magnifier icon) at the top of the webpage found at www.emerson.com Rosemount 490A Optical Dissolved Oxygen Sensor...
Page 2: Table Of Contents
NOTICE The Rosemount 490A has not been accepted, certified, listed, or labeled by any third-party certification agency for use in North America and is not included as part of the Rosemount 1058 approvals.
Page 3: Install The Probe
Make sure the nose cone is in place whenever the probe is submerged in water. 5. Connect the cable to the transmitter. 3 Install the probe You can install the Rosemount 490A dissolved oxygen probe in basins or ponds. Procedure Use the fitting at the rear of the probe to attach it to a pipe.
Page 4: Wiring The Probe
4 Wiring the probe The Rosemount 490A dissolved oxygen probe comes with an integral cable that connects to the connector on the transmitter. 5 Declaration of Conformity...
Page 5: China Rohs Table
6 China RoHS table Note There are no electronic spare parts for the Rosemount 490A.
Page 8 2025 Emerson. All rights reserved. Emerson Terms and Conditions of Sale are available upon request. The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount is a mark of one of the Emerson family of companies. All other marks are the property of their respective owners.