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Switch Calibration Procedure
Never perform switch calibration procedure while area is know to be hazardous
For intrinsically safe models,
S-K094A.
For standard explosion-proof models,
the Ohm setting across COM and NO. When the switch is active, the meter will read ≤0.5 Ohms, or the Diode
setting may be used simply to indicate continuity.
If a 120VAC source is used, an appropriately sized resistor must be used in series to limit current to a maximum
of 1.5 Amperes when circuit rating is unknown or permanent damage may occur.
For target adjustment of DXN models mounted in parallel and perpendicular orientation
Step 1: Remove 3 Phillips head screws and magnet clamp plate and target magnets.
Step 2: With the valve CLOSED position, slide target magnet#1 over switch 1 so that it activates. Ensure the
magnet is seated against target hub and o-ring.
Step 3: Rotate the valve to the OPEN position, slide target magnet#2 over switch 2 so that it activates. Ensure
the magnet is seated against target hub and o-ring.
Step 4: Place magnet clamp plate onto target hub aligning the three holes. Attach clamp plate with 3 Phillips
head screws. Torque screws to 160 in-oz minimum.
Step 5: Cycle the valve CLOSED and OPEN several times to ensure proper calibration. If recalibration is
required repeat stepts 1 through 4.
For reverse acting applications (CCW to close), the switch functions will be transposed. Sw 1 becomes open.
Sw 2 becomes closed.
The target disk has been designed to accommodate various applications and rotations. If your
application is different from those outlined here, please consult the factory for further information.
Terms and Definitions
Process valve: A valve that is being controlled either by actuator or cylinder and the use of a Valvetop product
with or without a control valve.
Control valve: A valve used to power an actuator or cylinder that is in turn used to actuate a process valve.
Clockwise (CW): Rotated in the direction of a clocks normal movement.
Counter clockwise (CCW): Rotated in the opposite direction of a clocks normal movement.
Normal acting: Full CW is when the process valve is closed and CCW is when the process valve is open.
Reverse acting: Full CW is when the process valve is open and CCW is when the process valve is closed
Parallel orientation: Process valve flow is parallel to the direction of the side conduit entries of the enclosure
Perpendicular orientation: Process valve flow is perpendicular to the direction of the side conduit entries of
the enclosure.
the unit must be wired in accordance with the control drawing S-K094 and
the calibration may be preformed using a Volt-Ohm meter by using
GO Switch Replacement Part
SPDT 35 Series Nuclear GO Switch
35N
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