TQ402 vs TQ403 | Proximity Sensor Comparison

Time: April 15, 2026

TQ402 vs TQ403 | Vibro-Meter Sensor Comparison

What are TQ402 and TQ403 Proximity Sensors?
TQ402 111-402-000-013 and TQ403 111-403-000-013 both famous as non-contact transducer. They are designed situable for shaft vibration and axial position in rotating equipment, widely used in steam, gas and hydraulic turbines, as well as in alternators, turbo-compressors and pumps. TQ402 and TQ403 have an integral coaxial cable, terminated with a self-locking miniature coaxial connector. The signal conditioner for them are IQS450, which successor is IQS900.

TQ402: High‑Precision Sensor for Small Clearances
TQ402 111-402-000-013 measurement range is 2 mm or 4 mm, workable for the system length 1m, 5m or 10 m to meet the different requirement. It meets API 670 standards, supports metric and imperial threads TQ402 has a reverse-mount version TQ412 111-412-000-013.

TQ403: Long‑Range Sensor for Large Shaft Gaps
TQ403 111-403-000-013 measurement range is 12mm, system length option is 5m and 10 m. It uses an 18 mm sensing coil and M20×1.5 thread for stable mounting. TQ403 holds Ex ia and IECEx certifications. The operation temperature same as TQ402, from -40℃ to 180℃. Unlike TQ402, there is no reverse mount version for TQ403.
TQ403 111-403-000-013

Key Differences Between TQ402 and TQ403.

	TQ402	TQ403
Measurement range	2 or 4 mm	12 mm
Sensor (tip) diameter	Ø8.2 mm	Ø18 mm
Sensitivity	8 mV/µm or 2.5 µA/µm (2 mm range), 4 mV/µm or 1.25 µA/µm (4 mm range)	1.33 mV/µm or 0.417 µA/µm
Integral coaxial cable	0.5, 1.0, 1.5, 2.0, 5.0 ,10 m	1.0, 5.0 or 10.0 m

In short, select the TQ402 for small-clearance, high-precision tasks. Choose the TQ403 when you need extended range for larger rotating machinery. Both provide stable, maintenance-friendly performance for continuous condition monitoring and equipment protection.

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TQ402 111-402-000-013
TQ403 111-403-000-013

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