Emerson Rosemount 389 Quick Start Manual page 6

Ph/orp sensors

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Quick Start Guide

2.3.2 Sensor orientation

Install all Rosemount pH/ORP sensors within 80 degrees of vertical,

as shown in

sensor does not stay at the sensor tip and disrupt the measurement.

Figure 2-1: Sensor orientation

Install the sensor tip down within 80 degrees of vertical.

2.3.3 Install insertion style sensors

Emerson offers two primary mounting styles for pH/ORP sensors:

insertion and retractable.

Insertion style sensors have NPT pipe threads that you can connect

directly into the process or into a mounting adapter.

Figure 2-2: Example of a Rosemount insertion style sensor

A. Forward facing ¾-in. NPT are present on some Rosemount pH/ORP

sensor models.

B. Forward facing 1-in. NPT

C. Wrench flats

D. Rear facing 1-in. NPT

You can connect insertion style sensors to the process using the

forward facing NPT threads or you can use the rear facing NPT

threads for immersion mounting in a pond or basin.

Figure

2-1. This ensures that the air bubble within the

May 2023

Rosemount pH/ORP Sensors

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