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Potter OSYSU-2, Outside Stem and Yoke Valve Supervisory Switch, 2 SPDT Contacts
Potter OSYSU-2, Outside Stem and Yoke Valve Supervisory Switch, 2 SPDT Contacts

Potter OSYSU-2, Outside Stem and Yoke Valve Supervisory Switch, 2 SPDT Contacts

Manufacturer:Potter Electric
Manufacturer Part#:1010202
Our Part#:1010202
Stock Status: Call for Availability
Retail Price:$150.50
Your Savings:$34.73(23%)
Your Price:$115.77


Potter Electric







Feature 5




Feature 7

Switch Type:Valve Supervisory Switch|Pipe Type:Steel|Nominal Pipe Size:2 to 12|Mounting Type:Screws|Activation Type:Tamper|Activation Delay (Retard):No|Contact Type:SPDT
GSA logo


The OSYSU is used to monitor the open position of an OS&Y(outside screw and yoke) type gate valve. This device is available in two models; the OSYSU-1, containing one set of SPDT (Form C) contacts and the OSYSU-2, containing two sets of SPDT (Form C) contacts. These switches mount conveniently to most OS&Y valves ranging in size from 2" to12" (50mm to 300mm). They will mount on some valves as small as 1/2" (12,5mm).

The cover is held in place by two tamper resistant screws that require a special tool to remove. The tool is furnished with each device and should be left with the building owner or responsible party. Replacement or additional cover screws and hex keys are available.

Optional Cover Tamper Switch

A field installable cover tamper switch is available as an option which may be used to indicate removal of the cover.


The OSYSU and its associated protective monitoring system should be inspected and tested in accordance with applicable NFPA codes and standards and/or the authority having jurisdiction (manufacturer recommends quarterly or more frequently).

5 Stars
Facilities Planning and Design
Item shipped quickly and was as ordered. It is a direct replacement for a 70+ year old switch. Easy to install and calibrate.
Did you find this helpful?  9 of 11 Found Helpful
Reviewed by:  from Indianapolis, In. on 6/10/2015
5 Stars
OSYSU2 Potter
This item was very easy to install, and this company has very reasonable prices and quick shipping. Will order from them again.
Did you find this helpful?  3 of 5 Found Helpful
Reviewed by:  from New Martinsville, WV. on 6/3/2014
2 Stars
Manager of Fire & Life Safety
We have found that the internal switch mechanism is extremely sensitive and very hard to properly adjust. These switches are very temperamental and come out of alignment easily causing false supervisory signals and frustrations getting them realigned properly. The switching mechanism of the System Sensor OSY2 switch is much more reliable however they only have a single knockout so a junction box is required in applications where multiple tamper switches are installed. Even with the single knockout, the System Sensor OSY2 is a much better and more reliable tamper switch.
Did you find this helpful? 
Reviewed by:  from Spokane. on 8/19/2020

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