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The AF70982 111-412-000-012 is an API 670-compliant, TQ412 series intrinsically safe (Ex i) reverse-mount eddy current proximity transducer. It features a 3/8"-24UNF imperial stainless steel body combined with a Torlon wide-temperature advanced engineering plastic tip, providing a high protection rating of IP68.
Non-contact measurement system based on eddy current principle
Certified for use in potentially explosive atmospheres
Voltage or current output with protection against short circuits
The Vibro-Meter AF70982 111-412-000-012 proximity system allows contactless measurement of the relative displacement of moving machine elements. It is particularly suitable for measuring the relative vibration and axial position of rotating machine shafts, such as those found in steam, gas and hydraulic turbines, as well as in alternators, turbo-compressors and pumps. The system is based around a TQ 412 non-contact transducer (specifically designed for reverse-mount applications) and an IQS 450 signal conditioner. Together, these form a calibrated proximity system in which each component is interchangeable.
The system outputs a voltage or current proportional to the distance between the transducer tip and the target, such as a machine shaft. The active part of the transducer is a coil of wire that is moulded inside the tip of the device, made of Torlon. The transducer body is made of stainless steel with an imperial thread. The target material must, in all cases, be metallic.
The AF70982 111-412-000-012 has an integral coaxial cable, terminated with a self-locking miniature coaxial connector. It can be matched with a single EA 402 extension cable to effectively lengthen the front-end to a calibrated total system length. The IQS 450 signal conditioner contains a high-frequency modulator / demodulator that supplies a driving signal to the transducer to generate the necessary electromagnetic field used to measure the gap. The conditioner circuitry is made of high-quality components and is mounted in an aluminium extrusion.
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 AF70982 111-412-000-012 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.
Thermal Power Generation
Installed on the main shaft bearing pedestals of large steam turbine generator sets to monitor radial shaft vibration and axial displacement in real-time, preventing shaft bending or damage caused by unbalance or friction.
Petrochemical & Refining
Used in core rotating equipment such as cracking gas compressors and large hydrogenation feed pumps to continuously measure dynamic shaft orbits and axial float, ensuring equipment interlock safety in hazardous and flammable environments.
Hydropower Generation
Installed at the guide bearings (upper, lower, and turbine guide bearings) of medium-to-large hydro-generator units to monitor hydro-turbine shaft swing, axial displacement, and rotational speed.
Metallurgy & Steel
Used for high-precision, non-contact speed and vibration monitoring on blast furnace blower units, Top Gas Recovery Turbine (TRT) systems, and large rolling mill drive shafts.
Nuclear Power Plants
Acts as a critical detector in the Machinery Monitoring System on large feedwater pumps, main coolant pumps, and steam turbines in nuclear or conventional islands, providing early fault warnings for reactor auxiliary equipment.
Wind Power Engineering
Used on the input/output shafts of speed-increasing gearboxes and the main shafts of direct-drive permanent magnet generators in megawatt-class wind turbines for unbalance and bearing wear phase tracking via Keyphasor signals.
When using the AF70982 111-412-000-012 eddy-current displacement sensor, it is critical to precisely adjust the initial mechanical gap to the linear midpoint voltage (typically -10V DC) via a dedicated reverse-mount bracket. During installation and operation, the Torlon probe tip must be strictly protected from physical impacts, and the target shaft surface must be smooth, scratch-free, and perfectly match the factory material calibration (typically AISI 4140 steel).
Furthermore, the miniature coaxial connector at the cable end must be fitted with an insulating protective sleeve to prevent accidental grounding against the machine casing or shaft, and the total electrical cable length of the complete system (probe, extension cable, and conditioner) must match strictly.
API 670 Ex-i reverse-mount proximity probe, DC-20kHz frequency response, 5m system, IP68, -40 to +180°C. Ideal front-end for turbine/compressor shaft vibration, displacement, and speed monitoring.
It is a TQ412 series reverse-mount non-contacting eddy-current proximity/displacement transducer originally manufactured by Vibro-Meter.
What is the probe diameter and measuring range of AF70982 111-412-000-012?
The sensor features a standard 8 mm probe diameter, providing a typical standard linear measuring range of 2 mm when paired with its signal conditioner.
Can AF70982 111-412-000-012 directly output a 4-20mA signal?
No. It outputs a high-frequency, high-impedance signal and must be connected to a signal conditioner (such as IQS450 or IQS900) to convert it into an industry-standard voltage or current signal.
What is the mechanical mounting thread specification for AF70982 111-412-000-012?
This specific model features a metric M10x1 fine thread specification on its transducer body.
Does AF70982 111-412-000-012 come with an external flexible armored sleeve?
No. This specific model's cable is supplied without an additional external flexible metallic armor or conduit protection.
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