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133396-01
Overspeed Detection I/O Module
In Stock
Ships by Saturday, July 18
Fast Shipping Available
Product Describe：
Overspeed Detection I/O Module
2 independent channels accepting
proximity probes or magnetic pickups
Accepts transducer signal range from +10.0 V to -24.0 V
The 133396-01 is a specialized Overspeed Detection Input/Output (I/O) Module engineered to function within the 3500/53 Overspeed Detection System framework, a vital component of the 3500 series Machinery Protection System. Positioned at the rear position of the standard 3500 machinery monitoring rack, this hardware serves as the primary physical termination and wiring interface for speed sensors located on high-speed critical rotating equipment, such as steam turbines, gas turbines, and large industrial expanders.
Multi-channel speed acquisition
High-level physical protection
Hardware-level security output
The terminal blocks on the 133396-01 plate accommodate raw pulse signal streams directly from magnetic pickups or proximity transducer systems. The hardware is configured with integrated heavy-duty mechanical relays and specialized solid-state output paths that pair directly with automated emergency trip system (ETS) loops and safety interlocks. When utilized within safety-critical architectures, multiple units of this module can be installed adjacent to one another in groups of three to achieve a Triple Modular Redundant (TMR) structural configuration, supporting hardware-level voting logic to prevent single-point failures and accidental asset trips.
The entire module assembly is packaged within a rugged industrial frame to operate reliably within harsh, high-noise ambient power plant environments, providing a standardized, line-replaceable unit (LRU) solution for plant turnarounds and scheduled hardware maintenance cycles. The Bently Nevada 133396-01 module is positioned as a rear-mount component that secures via fixed mounting screws directly onto the 3500 rack chassis backplane. Wiring integration is managed through high-density terminal blocks featuring Euro-style or barrier strip connection options to maintain continuous physical clamping on external pickup conductors.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil & Gas
Monitors the rotational speed of gas turbine-driven compressors in large natural gas pipelines. If the speed exceeds the safety threshold, the module triggers an Emergency Shutdown (ESD) to prevent high-pressure gas leaks and compressor catastrophic failure.
Petrochemical & Refining
Used for hydrocracking recycle hydrogen compressors in refineries. Since the handled medium is flammable and explosive high-pressure hydrogen, the module ensures shaft stability via overspeed protection to avoid severe mechanical accidents.
Thermal Power Generation
Monitors large coal-fired or gas-fired steam turbine generator sets. Generators are prone to overspeed (runaway) during sudden grid load rejection, this module closes main steam valves within milliseconds to protect turbine blades.
Nuclear Power Plants
Applied to main feedwater pump steam turbines and main generator units in nuclear power plants. It provides redundant overspeed voting logic (e.g., 2-out-of-3) to ensure the absolute safety of mechanical equipment in primary and secondary loops.
Hydroelectric Power Generation
Monitors the speed of large hydro turbines (such as Francis or Kaplan turbines). If the governor fails and water flow goes out of control, the module commands the guide vanes or emergency gates to close, preventing overspeed destruction.
First, ensure the correct configuration of channel redundancy and voting logic (e.g., 2-out-of-3), and perform regular non-destructive online overspeed testing to prevent false trips or failures to trip. Second, strictly standardize the installation gap and cable shielding of sensors (such as eddy current or magnetic pickups) to eliminate speed signal distortion caused by electromagnetic interference.
Lastly, module hot-swapping or wiring changes must be conducted under power-off conditions, and verify that its firmware version is fully compatible with the 3500 rack and configuration software to maintain its high-standard intrinsic safety ratings.
The 133396-01 overspeed detection I/O module incorporates multiple input channels constructed with high galvanic and transient isolation barriers to structurally segregate sensitive internal rack processing circuitry from volatile field lines and external electromagnetic interference (EMI).
The 133396-01 is an Overspeed Detection I/O Module within the Bently Nevada 3500/53 Electronic Overspeed Detection System.
What is the core function of 133396-01?
Its core function is to continuously measure the rotational speed of the equipment shaft in real time and immediately trigger protection or alarm signals if an overspeed condition exceeding the safe setpoint is detected.
How to install and connect 133396-01?
The module must be inserted into the rear slot of a Bently Nevada 3500 rack (as an I/O module) and connected to external speed sensors, such as proximity probes or proximitors, via terminal blocks.
How does 133396-01 receive signals?
It receives magnetic or eddy-current signals from proximity probes, where the frequency is proportional to the shaft rotational speed.
What critical machinery does 133396-01 monitor?
Used in critical machinery such as steam turbines and compressors in petrochem and power industries.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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