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This 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 402 or TQ 412 non-contacting transducer and its matching IQS 452 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 (e.g. machine shaft). The active part of the transducer is a coil of wire that is moulded inside the tip of the device, which is made of Torlon (polyamide-imide). The transducer body is made of stainless steel. The target material must, in all cases, be metallic.

The transducer body is available with metric or English thread. The TQ 412 version is intended for reverse-mount applications. The TQ 402/412 has an integral coaxial cable, terminated with an AMP-type connector. Various cable lengths (integral and extension) may be ordered. The IQS 452 signal conditioner contains an HF modulator/demodulator that supplies a driving signal to the transducer. This generates 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. The TQ 402/412 transducer can be matched with a single EA 402 extension cable. Optional junction boxes and housings offer mechanical protection of the integral and extension cable connectors. The proximity system is powered by associated processor modules or a rack power supply.

OUTPUT CHARACTERISTICS Voltage output, 3-wire configuration • Voltage at min. GAP : -1.6 V • Voltage at max. GAP : -17.6 V • Dynamic range : 16 V • Output impedance : 500 Ω • Short-circuit current : 45 mA Current output, 2-wire configuration • Current at min. GAP : 15.5 mA • Current at max. GAP : 20.5 mA • Dynamic range : 5 mA Output capacitance : 1 nF

Output inductance : 100 μH SUPPLY Voltage : -20 V to -32 V Current : 13 ± 1 mA (25 mA max.) Supply input capacitance : 1 nF Supply input inductance : 100 μH ENVIRONMENTAL CHARACTERISTICS (According to DIN 40040) Temperature range • Operation : -30°C to +70°C • Storage : -40°C to +80°C Humidity • Operation and storage : Max. 95% non condensing Vibration • Operation and storage : 2 g peak between 10 Hz and 500 Hz Protection class : IP 40 PHYSICAL CHARACTERISTICS Construction material : Injection moulded aluminium ELECTRICAL CONNECTIONS Input : Stainless steel coaxial female socket Output and power : Screw terminal strip WEIGHT Standard version : Approx. 140 g Exi version : Approx. 220 g