Performance/Safey Related Concern for Rosemount Inc. (Emerson) 396 and 398 Series pH Sensors for Use in Hazardous (Classified) Locations

FM Approvals has been made aware by Rosemount Analytical / Emerson of a manufacturing defect in Rosemount 396 and 398 Series pH sensors that led to sensors being shipped with uncured encapsulating epoxy between August 22nd and August 25th, 2023. The sensors are FM Approved for use in Hazardous (Classified) Locations (potentially explosive atmospheres).

Company Identity: Rosemount Inc
Address: 8200 Market Blvd
Chanhassen, MN 55317
United States

Contact Information: Emerson Global Customer Care (24/7 Support)
Phone: +1 (888) 889-9170
Email: [email protected]

Description: pH Sensors
Make/Model: 396, 396P, 396PVP, 396R, 396RVP, 398, 398VP, 398R & 398RVP
FM Approval Status: FM Approved in United States for use in Hazardous Locations. United States: FM17US0198X

Hazard Involved: The products in question are pH Sensors that are Approved for use in Hazardous Locations. The sensors along with their associated electronics are intended to be encapsulated using epoxy material. In the event that the epoxy material is uncured, this may result in process leaks, including the potential for the internal assembly to become disconnected from the process body. This could lead to a loss of primary pressure containment causing the escape of process fluid from the sensor body. It is also possible that the epoxy may no longer adequately protect the electronics assembly resulting in a potential hazard in an explosive gas or dust environment.