When Your Machine Protection Chain Goes Silent
A failed proximity probe does not announce itself. The reading drifts, the gap voltage wanders, and suddenly your API 670 protection logic has nothing trustworthy to act on. The 111-912-000-011-A1-B6-E5000-F0-G0-H05 from Vibro Meter (Meggitt) is built to keep that chain honest — a non-contact eddy-current measuring system with a 5 m total chain length and a 3/8″-24UNF body thread.
This is the TQ912 proximity sensor configuration: standard environment, 5000 mm integral cable, no flexible hose, no optional protection. It ships as a complete, calibrated measurement chain.
Solving Four Real Engineering Pain Points
Pain Point 1: Harsh Environments Kill Sensors
The sensor head — tip and integral cable — carries an IP68 rating to IEC 60529. The sensor operates from −40 to 180°C, with short-term survival to 220°C for up to 2 hours. Cabling and connectors handle −40 to 200°C. Vibration tolerance reaches 5 g peak between 10 and 500 Hz, and shock resistance hits 15 g peak (half sine-wave, 11 ms).
Pain Point 2: Drift Destroys Measurement Confidence
The temperature-compensated design keeps measurement drift under 5% across −30 to 150°C for 1, 5 or 10 m chains. Calibration is performed at +23°C ±5°C against VCL 140 steel. Frequency response spans DC to 20 kHz (−3 dB), with a linear measurement range of 2 or 4 mm.
Pain Point 3: Signal Integrity Over Distance
The FEP-covered 70 Ω coaxial cable measures Ø3.6 mm and uses self-locking miniature coaxial connectors — hand-tightened until locked. Current-signal transmission travels up to 1 km. The sensor requires a high-frequency power source from an IQS900 signal conditioner, which offers removable screw-terminal connectors and DIN-rail mounting.
Pain Point 4: Safety and Diagnostics
Optional diagnostic circuitry detects sensor, cabling and signal conditioner problems. The design suits functional safety contexts: SIL 2 per IEC 61508 and Cat 1 PL c per ISO 13849. It conforms to API 670 5th edition.
Where This Chain Earns Its Keep
Steam turbine monitoring. The IP68 head and 180°C operating range handle the radiant heat near bearing housings. The 5 m chain reaches from the probe mount to the signal conditioner without an extension cable.
Compressor protection. API 670 conformance means the chain slots into existing machinery protection philosophies. The 2 or 4 mm linear range covers typical shaft displacement measurements.
Functional safety loops. Where SIL 2 or Cat 1 PL c is required, this system is designed for that context — with diagnostic circuitry available to flag sensor and cabling faults before they become trips.
Integration and Selection Notes
This sensor needs an IQS900 signal conditioner to operate — it does not run standalone. Confirm your conditioner model and chain length before ordering. The 3/8″-24UNF thread is fixed for this configuration; verify your mounting adaptor matches. The 5000 mm integral cable is fixed, so plan routing accordingly.
Oil AutoTech supplies spares when you need them for oil, gas and industrial automation applications. Contact Oil AutoTech today for pricing and availability.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
