Shocker Pass-1500-12VAR Positive Air Shutoff System w VR Speed Sensor

Shocker PASS-1500-12VAR Positive Air Shutoff System, 12 V Electronic Controller with VR (Variable Reluctance) Speed Sensing, Complete Intake Valve Kit with Hoses/Clamps/Wiring, Emergency Lock-Out Switch & Auto-Reset Breaker

Condition: New other — partially assembled as pictured; never installed; includes manuals, control kit, wiring harness, valve, silicone hoses, correct number/size of clamps, standard military-type switch with lock-out cover, electronic controller, auto-reset breaker & cover.

The Shocker PASS-1500-12VAR is a complete, vehicle-ready positive air shutoff (PASS) kit designed to protect diesel engines from overspeed and runaway. The core of the system is a fast-acting intake shutoff valve driven by an electronic controller that monitors engine speed via a VR (variable reluctance) speed sensor. If the controller detects an overspeed condition—or if the operator commands a shutdown—the valve closes to choke intake air and stop combustion within seconds. This 12 V kit arrives with the appropriate valve body for your intake size, silicone couplers, clamps, a pre-terminated wire harness, auto-reset circuit protection, a standard military-type guarded switch (on/off or momentary-off options available), and clear installation/operation manuals. It’s a robust solution for oil & gas, mining, military, marine, and mobile service fleets where diesel runaway risk and regulatory requirements demand engineered intake shutoff.

Identifiers:
• Model/Series: PASS-1500-12VAR (12 V; electronic control; VR speed input)
• Includes: Valve body, controller, VR speed sensor interface, harness, auto-reset breaker & cover, switch + lock-out cover, manuals, silicone hoses, correctly sized clamps, installation hardware. Study pictures for more information.

Features

• True Positive Air Shutoff (intake): Starves the engine of air during overspeed/runaway or manual E-stop.
• VR Speed Sensing: Uses a variable-reluctance sensor for accurate RPM monitoring on diesel engines.
• 12 V Electronic Controller: Continuous speed monitoring, self-check at power-up, and automatic trip on overspeed.
• Manual & Automatic Trip: Close via control logic or via guarded, military-type operator switch (on/off or momentary-off).
• Auto-Reset Circuit Protection: Included breaker with cover streamlines a clean, serviceable install.
• Complete Plumbing Kit: Silicone hose lengths and appropriately sized stainless clamps for the supplied valve body.
• Serviceable Valve Assembly: Inline body with quick-access fasteners for inspection and cleaning.
• Lock-Out Safety Cover: Prevents accidental actuation; supports safety/permit-to-work procedures.
• Supplied Wire Harness: Labeled leads for keyed power, ground, sensor, switch, and valve actuator.
• Installation/Operation Manuals Included: Clearly outlines mounting orientation, sensor placement, and commissioning.

Technical Snapshot (typical for PASS-1500-12VAR series)

• System Voltage: 12 V DC nominal
• Sensing Input: VR (variable reluctance) speed sensor (e.g., crank, flywheel, alternator tone wheel)
• Control Modes: Automatic overspeed trip; operator-initiated emergency trip via guarded switch
• Circuit Protection: Auto-reset breaker included
• Valve Type: Inline intake shutoff; rapid-close actuator
• Hose & Clamp Set: Silicone couplers and stainless clamps sized to the provided valve body
• Switching Hardware: Standard military-type switch with lock-out cover; on/off or momentary-off versions
• Harness: Pre-terminated/labeled; designed for engine-bay routing
  (Exact valve bore size, closure time, and current draw depend on the specific valve supplied in this kit; the “appropriate valve body” note indicates the package was configured for a particular intake diameter.)

What’s Included

• Positive air shutoff valve body (size matched)
• Electronic controller (12 V) with VR speed sensor interface
• Wire harness (pre-terminated)
• Auto-reset breaker with protective cover
• Standard military-type switch (on/off or momentary-off) with lock-out cover
• Silicone hose lengths and correct number/sizes of clamps
• Installation manual and operation instructions
• Control kit components as pictured (mounting hardware, connectors)

Applications & Industries

• Oil & Gas / Well Servicing: Workover rigs, coil tubing units, snubbing, and frac support equipment near hydrocarbon releases.
• Mining & Quarry: Loaders, dozers, haul trucks where gas ingestion risk exists.
• Military & Defense: Tactical vehicles requiring guarded emergency engine stops.
• Marine & Port Operations: Dockside equipment and service trucks.
• Industrial & Municipal Fleets: Vacuum trucks, sewer jetters, and recovery vehicles.
• Hazardous Locations Compliance: Helps meet site rules where engine runaway mitigation is required.

Cross-Referenced Models (Shocker PASS family)

• PASS-1500-12VAR — this listing (12 V, VR sensor input)
• PASS-1500-24VAR — 24 V version with VR sensor input
• PASS-1500-12V — 12 V, electronic control without VR option (switch/manual trip + alternative triggers)
• PASS-1500-24V — 24 V counterpart
• PASS-1500 series — general family designation for electronically actuated intake shutoff kits

Comparable Products (same function/class)

• AMOT: 4050 / 4090 / 4420 electrically actuated air intake shutoffs
• Chalwyn (AMOT brand): EV/ELV series electric intake shutoff valves
• Roda Deaco: E2/E6 electric intake shutoff systems with electronic overspeed control
• Pyroban / Chalwyn: X-series mechanical spring-return valves (manual-trip style)

System Integration & Installation Notes

• Mounting: Install the valve in the intake tract upstream of the manifold (often pre-turbo or between intercooler and manifold based on packaging and kit size). Maintain straight-run lengths where possible.
• Orientation: Follow arrow/flow marking; keep actuator clear of contact and heat sources.
• Sensor Placement: VR sensor aimed at a ferrous toothed wheel (flywheel or accessory). Maintain the prescribed air gap.
• Electrical: Power from keyed 12 V through the included auto-reset breaker; ground to clean chassis/engine point.
• Commissioning: Set overspeed threshold per manual, verify manual trip, and perform a no-fuel test to confirm full closure.
• Operator Interface: Guarded switch with lock-out cover helps prevent unintended activation; momentary-off option supports hold-to-trip policies.
• Maintenance: Periodic inspection of couplers/clamps; confirm valve cycles freely and sensor gap remains within spec.

Trademarks

Shocker, AMOT, Chalwyn, Roda Deaco, and other brand names are trademarks or registered trademarks of their respective owners. All trademarks are used here strictly for identification and comparison purposes.

Related

positive air shutoff system; diesel engine runaway protection; intake shutoff valve kit; VR speed sensor shutdown; 12 volt PASS controller; guarded emergency engine stop switch; military lock-out switch cover; silicone intake couplers and clamps; variable reluctance RPM sensor; electronic overspeed protection; oilfield truck safety device; device to stop diesel by cutting air; engine overspeed controller; air intake emergency stop valve; shutdown system for vacuum truck; mining equipment safety shutoff

Common Requests:

1. “How to wire a PASS-1500-12VAR with VR sensor to keyed power and breaker?”
2. “What intake bore sizes are supported by the Shocker 1500 series valves?”
3. “PASS-1500-12VAR overspeed setpoint adjustment and commissioning checklist.”
4. “Can I use the military-type momentary-off switch instead of on/off with this controller?”
5. “Maintenance schedule and valve closure test procedure for Shocker PASS.”

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