System Sensor OSYEXP User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

CAUTION

OSYEXP Explosion Proof
Gate Valve Supervisory Switch

Specifications

Contact Ratings: One SPDT (Form C) Switch
15 A @ 125/250/480 VAC; 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC
1/2 A @ 125 VDC; 1/4 A @ 250 VDC
Dimensions: 7″L X 3.125″D X 4.875″H
Maximum Stem Extension: 2.875″
Bracket Span: 7″
Operating Temperature Range: –40° - 160°F (–40°C – 71°C)
Shipping Weight: 2-1/4 lb.
Enclosure Rating: UL Listed explosion proof switch enclosure for use in hazardous locations.
Class I, Groups C and D; Class II, Groups E. F and G

Important

Please Read Carefully And Save

This manual contains important information about the
installation and operation of supervisory switches. These
instructions apply to System Sensor switches for outside
screw and yoke valves only. Read all instructions carefully
before beginning installation.

To prevent ignition of hazardous atmospheres, disconnect
supply circuit before opening. Keep assembly tightly closed
when in operation. Do NOT leave unused wires exposed.

All supervisory switch installations must comply with local
codes and ordinances and the requirements of the author­ity having jurisdiction. Additional information is available
in National Fire Protection Association standards NFPA 13,
13D, 13R, 71, and 72.

General Installation Considerations

The OSYEXP Supervisory Switch can be mounted on open
yoke valves between 1/2″ and 12″ in diameter. The switch
is designed to supervise the open condition of the OS & Y
Gate Valve in hazardous locations.

All OSYEXP models are equipped with a ground screw
inside the switch housing for those applications where
grounding is required.

Narrow Yoke Valves

As Figure 1 suggests, installing the valve with mounting
bolts inside the yoke is recommended. However, some
valves may have yokes that are too narrow for this arrange­ment. If this is the case, the bolts can be positioned on the
outside of the yoke.

Limited Clearance Valves

The OSYEXP mounting bracket fits most of the open yoke
valves used in fire protection systems. However, some of
these valves, especially those less than 11/2″ in diameter,
have irregularly shaped yokes or such limited clearances
that the clamping bar cannot be installed properly and/or
it causes the valve to bind. If this is the case, the use of
the supplied J-bolts is required to attach the OSYEXP to the
valve (see J-Bolt Detail, Figure 1).

Installation Procedure

See Figures 2 and 3, as required, while performing the pro­cedure that follows.

Perform step 1 on valves 11/2″ in diameter and smaller
only. Proceed directly to step 2 if the switch is being
installed on a valve larger than 11/2″ in diameter.

1. Remove and discard the two C-clips and roller from the
actuating lever.

2. Set the valve to its fully open position. Remove the
OSYEXP Supervisory Switch from the carton and adjust
the position of the retaining washers to provide suffi­cient bolt length for the yoke thickness of the valve.

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: [phone]

www.systemsensor.com

D770-27-00 1 I56-1429-002R

Figure 1:

Switch Housing

Actuating Lever

Mounting Bracket

Yoke

Retaining Washer

Nut

Hex Wrench

Clamping Bar

Carriage Bolt

Slide Clamping
Bar to remove
or install

W0182-00

J-Bolt Detail:

NOTE:

Larger gate valve shown (2″ through 12″). When install­ing supervisory switch to smaller gate valves (1/2″ through
11/2″), carriage bolts are to be located on outboard side of
yoke. On small valves with limited clearance, J-bolts may
be used.

W0207-00

D770-27-00 2 I56-1429-002R