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TQ9xx-based proximity measurement chains allow contactless measurement of the relative displacement of moving machine elements, and provide an output signal proportional to the distance between the sensor tip and the target. Accordingly, these measurement chains are ideally suited 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. A TQ9xx-based proximity measurement chain consists of a TQ9xx proximity sensor, an optional EA90x extension cable and a IQS900 signal conditioner, configured for a particular industrial application. The EA90x extension cable is used to effectively lengthen the front-end, as required. Together, these form a calibrated proximity measurement chain in which each component is interchangeable.

The active part of a TQ9xx proximity sensor is a coil of wire that is moulded inside the tip of the device, made of PPS (polyphenylene sulfide), a high-performance, high-temperature engineering thermoplastic. The sensor body is made of stainless steel. The target material must, in all cases, be metallic. The TQ902 and TQ912 proximity sensors are essentially the same except that the TQ902 is intended for standard-mount and the TQ912 is for reverse-mount applications. Both sensor bodies are available with metric or imperial threads and have an integral coaxial cable terminated with a self-locking miniature coaxial connector. A TQ9xx sensor’s integral cable and the EA90x extension cables are available in various lengths, which can be combined to obtain a particular total system length (TSL) for an application. Optional interconnection protectors (IP172), junction boxes (JB118) and other housings are available for the mechanical and environmental protection of the connection between a TQ9xx sensor’s integral cable and a EA90x extension cable.

Equally important, TQ9xx-based measurement chains using a IQS900 with diagnostics are SIL 2 “by design” so they bring enhanced reliability and significant risk reduction, making them suitable for use in safety-related applications (functional safety contexts). Further, TQ9xx-based measurement chains are form, fit and functionally equivalent replacements that match or better the outstanding performance of TQ4xx-based measurement chains. Each component is interchangeable, so existing TQ4xx-based proximity measurement chains can be quickly and easily replaced or upgraded. For example, a IQS900 signal conditioner without diagnostics is a direct replacement for a IQS45x in most TQ4xx-based measurement chains. Note: A TQ9xx-based measurement chain using a IQS900 configured with a current output and a GSI127 galvanic separation unit, allows transmission over distances up to 1 km – longer than any other solution.

General

Sensor input requirements : High-frequency power source from a IQS9xx signal conditioner

Environmental

Temperature range

• Sensor : −40 to 180°C (−40 to 356°F) operating. 180 to 220°C (356 to 428°F) short-term survival for 2 hours max.

• Sensor and cabling : Temperature for use in an Ex Zone: see Potentially explosive atmospheres on page 4

• Cabling, connector and optional protection : −40 to 200°C (−40 to 392°F) Measurement drift

• Sensor and cabling with a total system (chain) length of 1, 5 or 10 m : <5% for −30 to 150°C (−22 to 302°F)

Pressure between sensor tip and body : 6 bar (100 psid) max.

Protection rating (according to IEC 60529) : The head of the sensor (sensor tip and integral cable) is rated IP68

Vibration (according to IEC 60068-2-26) : 5 g peak between 10 and 500 Hz

Shock acceleration (according to IEC 60068-2-27) : 15 g peak (half sine impulse, 11 ms duration)

Physical characteristics

Sensor construction : Wire coil Ø8 mm, PPS (polyphenylene sulfide) high-performance thermoplastic tip, crimped to a stainless-steel body (AISI 316L)

Integral and extension cables : FEP covered 70 Ω coaxial cable, Ø3.6 mm

Connectors : Self-locking miniature coaxial connectors.

Note: When connecting, these should be hand-tightened until locked.

Optional protection

• Flexible stainless-steel hose (protection tube) with FEP sheath (extruded fluorinated ethylene propylene) : The combination of stainless-steel hose with FEP sheath provides sealed (leak-tight) mechanical and electrically insulated protection.

Note: The FEP sheath also provides resistance to almost all chemicals and low permeability to liquids, gases and moisture, while being flexible, low friction and mechanically tough.