Emerson Rosemount 389, Reference Manual

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In most cases, the sensor can simply be installed as shipped, and you can obtain readings
with an accuracy of ±0.2 pH. To obtain greater accuracy or to verify proper operation, the
sensor must be calibrated as a loop with its compatible analyzer or transmitter.
2.2.1 Submersion mounting
Rosemount 389 and 389VP Sensors have a 1-in. MNPT process connection at the back of
the sensor.
Procedure
1. To prevent rain water or condensation from running into the sensor, use a
weatherproof junction box (see Figure 2-3 ).
2. Using a standard 1-in. union, mount the sensor to a 1-in. SCH 80 CPVC or PVDF
standpipe.
3. Tapered pipe threads in plastic tend to loosen after installation. We therefore
recommend that you use PTFE tape on the threads and check the tightness of the
connection frequently to ensure that no loosening has occurred.
Reference Manual Install
00809-0100-3389 February 2019
Reference Manual 13