Housing - 381 - Guarded Electrode Housings for Headplates with Threaded 3/4" DIN Access

Guarded Electrode Housings for Headplates with Threaded 3/4" DIN Access

Specifications
How to Select the Correct Housing
Ordering Information

The Model 381 housing threads directly into the top plate of older benchtop and pilot scale vessels with 3/4" DIN threaded access. It will replace the vessel’s original compression fittings. This housing accepts the metric Fermprobes® and D140 and D145 OxyProbes®. Different housing lengths are available to accommodate the desired insertion depth of the probe. The short housing with 50 mm guide is the most common for both pH and D.O. sensors. However, if sensor breakage is a concern, the longer housing is often used to protect the glass body of pH electrodes.

SPECIFICATIONS

• 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.

How to Select the Correct Housing

(1) Confirm the headplate opening has 3/4" DIN threads.

(2) Determine which type of sensor will be used, pH or D.O. The Model 380 housing will accept any probe with a Pg13.5 threaded cap.

(3) If the housing is to be used with a D140 or D145 OxyProbe, the short housing with 50 mm guide tube is the best choice. Skip to #5 to determine the sensor length.

(4)If measuring pH, 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.

(5) Determine how far the housing and sensor should extend into the vessel by answering each of the following questions.

• Will the sensor hit the bottom of the vessel?
• Will the sensor tip be above the surface of the media?
• Will the sensor hit anything in the vessel (i.e. agitation paddles or sparge ring) when the fermentor is assembled?

When the answer is “no” to all, the correct length has been selected.

Ordering Information

Call 1-800-288-2833 – For Price & Delivery

Housing Model

Class

Typical Insertion Length

Used With Electrode Models

Used With Electrode Length

Housing Part Number

Guarded Housings

381

184 mm (7.3")

F-635, F-695

225 mm

381-61-H180

381

284 mm (11.2")

F-635, F-695

325 mm

381-61-H280

Unguarded Housings

380

180 mm (7.1")

F-635, F-695, D140

225 mm

380-61-H180

380

280 mm (11.0")

F-635, F-695, D145

325 mm

380-61-H280

Short Housing with 50 mm Guide Tube

380

Any

variable

F-635, F-695, D140, D145

Any

380-61-H050