Model 325 Housing (Standard 25 mm port – Pg13.5)

Name: Model 325 Housing (Standard 25 mm port - Pg13.5)
SKU: 445

These sensor housings are designed to be used with model F-235, F-285, F-635, F-695, F-835 and F-895 Metric FermProbes^® and models D540 or D545 12 mm OxyProbe^® II dissolved oxygen sensors. They are also compatible with any 12 mm sensor that has Pg13.5 threads. These housings fit nearly all standard 25 mm ports found on production and pilot plant vessels. Different housing lengths are available to accommodate various application or vessel requirements.

Category: Housings

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Description
Ordering Information
How to select the correct housing

The sensor threads directly into this metric housing, eliminating the threaded retainer ring. In order to prevent twisting the cable, the metric FermProbes have a detachable cable.

Guarded and unguarded versions are also available. Using a guarded housing is highly recommended for pH electrodes to provide maximum protection against damage to the sensing bulb. However, highly viscous media is prone to clog the guard.

Specification

316L stainless steel construction.
Serialized for traceability to mill steel specifications.
RA32 finish with electropolish on all wetted parts.
Permanently secured port retainer ring for additional operator safety.

Housing Model	Class	Typical Vessel Insertion Length	Used With pH Electrode and DO Sensor Models	Used With Electrode Length	Housing Part Number
Model 325	D	37 mm ( 1.5″)	F-235, F-285, F-695, F-635, F-835, F-895, D-540, D-545	120 mm	325-61-H070
Model 325	F	113 mm ( 4.5″)	F-235, F-285, F-695, F-635, F-835, F-895, D-540, D-545	200 mm	325-61-H150

Confirm the opening is a standard 25 mm side port.
Determine whether the application will permit the use of a bulb guard on the housing. The bulb guard is highly recommended for all applications except when the media is very viscous. Highly viscous media is prone to clog the guard.
Determine how far the housing and sensor should extend into the vessel.
Confirm the sensor is a metric FermProbe, models D540 or D545 OxyProbe II or European sensor with Pg13.5 threads.

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