System Sensor OSYEXP - Manual (Page 3)

D770-27-00 3 I56-1429-002R
Position the switch on the valve with the bolts on the
inside (preferably) or outside of the yoke, depending on
clearances. Adjust the position of the OSYEXP as far as
possible from the valve gland and in a location where
the actuating lever contacts the unthreaded section of
the valve stem (if the valve stem is already grooved,
proceed directly to step 6).
3. When the switch is in position on the valve, slide the
open end of the clamping bar onto the bolts and under
the retaining washers. If necessary, adjust the length of
the actuating lever by loosening the lever screw. The
lever is properly adjusted when it clears the clamping
bar. Tighten the nuts by hand and slide the OSYEXP until
the switch trip point is found as the lever rests on the
valve stem. This approximates the final position of the
OSYEXP after the valve stem is grooved. Carefully check
all clearances of the bolts, actuator, mounting bracket,
clamping bar, and OSYEXP cover. Adjust the position as
necessary. If clearance is a problem, refer to the Limited
Clearance Valves (page 1) section of this manual.
4. Mark the point on the valve stem where the actuating
lever contacts the valve stem.
5. Remove the OSYEXP by loosening the nuts and sliding
the clamping bar from beneath the retaining washers.
Remove the OSYEXP from the valve and set it aside.
(a) Valves 1
1 /
2 ″ in diameter and smaller only.
Use a 1 /
2
″ untapered round file to file a groove 3 /
32
″ deep
in the valve stem at the mark that was made in step 4.
Be sure to remove any burrs resulting from the filing
to avoid damaging the valve stem packing gland.
(b) Valves larger than 1 1 /
2
″ inches in diameter only.
Use a 3 /
8
″ untapered round file to file a groove 1 /
8
″ deep
in the valve stem at the mark that was made in step 4.
Be sure to remove any burrs resulting from the filing
to avoid damaging the valve stem packing gland.
Figure 2: 6. Mount the switch loosely with the actuating lever cen-
tered in the groove. When the switch is in position on
the valve, slide the open end of the clamping bar onto
the bolts and under the retaining washers, as indicated
in Figure 1.
7. Ensure that the actuating lever does not hit the clamping
bar at any point in its travel. If it does, adjust the length
of the lever by loosening the lever screw, sliding the
lever in or out, as needed, and retightening the screw.
8. Adjust the supervisory switch position on the valve so
that the switch is open when the actuating lever is in
the groove with the valve in the full open position. The
circuit should close when the valve is closed
1 /
5
of its
travel or 2 full turns of the handle, whichever is less. The
switch produces an audible “click” when it closes. The
switch closure can also be tested electrically by using an
ohmmeter to test for continuity between its terminals.
9. Tighten the nuts securely with a wrench and check
the operation of the OSYEXP as in step 8. If necessary,
reposition the OSYEXP and test it again.
10. Wire the supervisory switch as shown in Figure 3.
NOTE: When removing the cover of the OSYEXP use
provided allen wrench in box.
11. Replace the OSYEXP cover.
12. Test the operation of the OSYEXP by closing the valve
the 1 /
5
of its travel distance or two full turns, whichever
is less. The circuit should indicate a closure during
this procedure. If it does not, readjust the supervisory
switch and actuator positions until the switch closes
when the valve is operated.
Testing
Test the operation of all supervisory switches before they
are placed into service and at least semiannually, or as
required by the authority having jurisdiction.
NOTE: Notify the proper authorities that the supervi-
sory switch(es) is (are) undergoing maintenance
and, therefore, will be temporarily out of service.
Disable the system or zone undergoing testing to
prevent unwanted alarms.
Test the operation of the OSYEXP by closing the valve the
1 /
5
of its total travel distance or two full turns, whichever is
less. A contact closure must occur during this procedure.
If it does not, readjust the supervisory switch and actuator
positions until the switch closes when the valve operated.
YOKE
GROOVE
CLAMPING BAR NOT SHOWN
THREADED VALVE
GLAND HEX NUT
OR BOLT
VALVE
STEM
GLAND
STEM HEX
W0209-00