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The TQ402 111-402-000-012 is a TQ402 non-contact proximity sensor. Together with an IQS900 signal conditioner and an EA402 extension cable, it forms a calibrated proximity measurement system with fully interchangeable components. The complete system outputs a voltage or a current proportional to the distance between the transducer tip and the metallic target, such as a machine shaft.
Non-contact measurement system based on eddy-current principle
Ex certified versions for use in hazardous areas (potentially explosive atmospheres)
Voltage or current output with protection against short circuits
The active part of the transducer is a wire coil molded inside the tip, which consists of Torlon (polyamide-imide). The transducer body features a stainless-steel structure with metric or imperial threads. This TQ402 version has an integral coaxial cable terminated with a self-locking miniature coaxial connector. The associated IQS900 signal conditioner provides a high-frequency modulator/demodulator supplying a driving signal to the transducer to generate the electromagnetic field for gap measurement.
This sensor chain is backward compatible with legacy IQS450 installations and integrates with machinery monitoring systems such as VM600Mk2, VM600, or VibroSmart modules. Specifically optimized for critical machinery protection and diagnostic monitoring, the TQ402 system delivers precise real-time data on relative shaft vibration, axial positioning, and speed/phase reference (Keyphasor) via keyways or projections.
By measuring the contactless relative displacement of moving machine elements through oil and steam clutter, it prevents catastrophic failures like dynamic rubbing or thrust bearing degradation. Built to withstand harsh industrial environments, its ruggedized construction ensures exceptional thermal stability, chemical resistance, and vibration-proof positioning, making it the industry standard for safeguarding high-value rotating assets including steam, gas, and hydraulic turbines, alternators, turbo compressors, and high-capacity industrial pumps.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Vibro Meter TQ402 111-402-000-012 Meggitt Vibro-Meter TQ402 Proximity Transducer Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Power Generation Industry
Monitoring the axial thrust position of large steam turbine-generator shafts to prevent catastrophic blade-to-casing rubs, alongside tracking radial bearing vibrations.
Petrochemical & Refining Industry
Used to monitor the shaft orbit and dynamic runout of high-risk rotating assets like catalytic cracking units and high-pressure hydrogenation pumps, preventing hazardous media leaks caused by mechanical seal failures.
Metallurgy & Iron/Steel Industry
Monitoring the relative bearing vibration of blast furnace blowers and large exhaust fans to prevent severe bearing wear or shaft seizure under prolonged high-temperature and high-dust conditions.
Mining & Mineral Processing
Monitoring gearbox input/output shaft vibrations within heavy-duty ore ball mill and giant crusher drive systems to protect gearboxes under heavy and high-impact loads.
Chemical Manufacturing
Conducting non-contact measurements on the main agitator shafts of polymerization reactors to monitor shaft eccentricity and bending deformation, penetrating viscous or corrosive volatile gas mediums.
Pulp & Paper Industry
Monitoring the relative vibration and gap of drying cylinders and press section drive roll shafts in large paper machines to ensure uniform paper tension and prevent web breaks or bearing burnouts during high-speed operations.
During installation, the initial mounting gap (DC bias voltage) must be precisely adjusted to remain within the linear range of the IQS900/IQS450 conditioner, ensuring the transducer tip is perfectly perpendicular to the metallic shaft target. Field cabling must strictly adhere to the minimum bending radius without twisting, and the self-locking connectors should be sealed using heat-shrink tubing or junction boxes to prevent oil and moisture ingress. Crucially, the total cable length (transducer plus extension cable) must precisely match the system’s calibrated length and must never be cut or altered.
Additionally, the target shaft material (must be metallic, typically calibrated for 4140 steel), surface roughness, and residual magnetism will directly impact measurement accuracy; the sensor tip must be protected from mechanical impacts and should never be used in high-pressure or submerged environments exceeding 10 bar.
Meggitt vibro meter TQ402 Proximity Transducer 111-402-000-012 This non-contact sensor operates within shaft relative vibration and gap/position measurement chains for machinery protection and/or condition monitoring. It acts as the critical front-end sensing element to capture dynamic displacement signals from rotating components, such as steam turbines, gas turbines, and compressors.
What is the TQ402 111-402-000-012, and what is its core function?
It is an industrial-grade non-contact eddy current proximity transducer (probe) primarily used to precisely measure shaft vibration, shaft displacement, and speed of large rotating machinery.
How do you properly install and use products like the TQ402 111-402-000-012?
It must be rigidly mounted on the machine casing or internal bracket, with the probe tip facing the metallic target shaft at a predefined gap, and then connected to a signal conditioner (proximitor) via cable.
What is the operating principle of the TQ402 111-402-000-012 sensor?
It operates on the eddy-current principle. The internal coil of the probe generates a high-frequency electromagnetic field; when a metallic target approaches, eddy currents form on its surface, changing the loop impedance to measure gap variations.
Will oil contamination and moisture in the industrial field damage the TQ402 111-402-000-012?
No. It features a fully sealed structure with exceptionally high liquid and gas tightness, allowing long-term stable operation in high-heat oil mist, lubricants, and moisture environments inside bearing housings.
How large is the nominal linear measuring range that the TQ402 111-402-000-012 can measure?
Within a complete measurement chain, this standard 8 mm probe typically delivers a nominal linear measuring range of 2.0 mm.
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