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Quick Start Guide
WARNING
Corrosive substance
Hydrochloric acid is toxic and highly corrosive.
Avoid skin contact.
Wear protective gloves.
Use only in a well-ventilated area.
Do not inhale fumes.
In case of an accident, consult a doctor immediately.
•
For ORP (metallic) electrodes only, polish with moistened baking
soda.
4.6
Replace pH/ORP sensor reference junction and
recharge sensor electrolyte
Emerson has designed certain Rosemount pH/ORP sensor models
(3300HT, 3300HTVP, 3400HT, 3400HTVP, 3500P, and 3500VP) to allow
the reference junction and reference fill gel solution to be replaced.
Emerson has designed the Rosemount 350A pH/ORP Sensor to allow
the reference junction and reference fill air solution to be replaced.
Replacing the reference junction and recharging the electrolyte may
be an alternative to replacing the entire sensor when you observe a
high zero offset error during a calibration.
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.
28
WARNING
May 2023
Rosemount pH/ORP Sensors
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