Maintenance - Emerson Rosemount 3500P Quick Start Manual

Quick Start Guide
3

Maintenance

3.1 Clean electrodes
Electrodes should respond rapidly. Sluggishness, offsets, and erratic
readings are indicators that you may need to clean or replace the electrodes.
Procedure
1. To remove oil deposits, clean the electrodes with a mild, non-
abrasive detergent.
2. To remove scale deposits, soak electrodes for 30 to 60 minutes in a
five percent hydrochloric acid solution.
3.2 Replace reference junction and recharge sensor
electrolyte
The reference junction and reference fill gelled solution are replaceable to
facilitate longer sensor life. Over time, the electrolyte depletes and the
junction may become plugged or contaminated.
Prerequisites
Use the junction replacement kit and replacement fill gel.
Procedure
1. Remove the junction cap by turning it counter clockwise.
2. Remove the liquid junction by pulling the junction straight out.
The reference electrolyte may cause skin or eye irritation
Avoid contact with skin and eyes.
3. Rinse with water to remove the old reference fill gel.
4. Fill the reference fill chamber with the reference fill gel using the
syringe, and remove any air bubbles. Top off the reference fill
chamber until it is completely filled.
5. Replace the junction O-ring and liquid junction by sliding them over
the glass electrode.
Excess reference gel should flow out.
6. Replace junction cap by turning clockwise.
Hand tighten the junction cap only; do not use pliers to tighten the
cap.
18
WARNING
November 2020
Emerson.com/Rosemount