T-Guard Leak Detection Sensor

INFICON T-Guard Leak Detection Sensor delivers the sensitivity and speed helium leak detectors are known for, at a cost similar to pressure decay systems.


T-Guard works with simple chambers at atmospheric pressure, so there is no need for costly and complex high vacuum chambers and pumps. That makes automated systems based on T-Guard an attractive alternative to pressure decay and water bath leak detection, providing up to 100 times the sensitivity with low cost of ownership and high ease of use. The measurements are also highly repeatable, even with large, warm or humid test objects.


• T-Guard Leak Detection Sensor brings increased levels of productivity, reliability and sensitivity to any stage of production when testing automotive components, valves and similar products.


• Up to 100 times more sensitive than pressure decay and water bath
• Detects 3 x 10-4 mbar l/s (0.018 sccm) in a 10 l chamber in less than 20 seconds
• Works at atmospheric pressure – no need for costly vacuum chamber or high vacuum pump
• Maintenance-free INFICON Wise Technology , proven in more than 1000 systems
• Measurements are not affected by temperature and humidity
• Simple design maximizes reliability, reduces cost of ownership
• Small and light for easy integration in any system
• Multiple measurement modes for flexibility
• Designed for automated systems
• Flexible control by PLC, PC, Profibus or optional display unit

Typical Applications

• Wherever pressure decay and water bath systems are used or are not sensitive enough
• Leak detection for room air conditioner components
• Manufacturers of automotive gas lines, small heater coils, etc. that are now demanding greater leak tightness
• Leak detection involving warm, humid or large parts, where the pressure decay method is ineffective
• Other markets where helium vacuum leak detection has been considered too costly or complex

Type T-Guard Leak Detection Sensor
Minimum detectable leak rate mbar•L/s 1E-5
Measurement range 5 Dekaden
Test chamber pressure 1 atm (Atmosphäre/Normaldruck)
Operation modes 2 automatisch, 1 fortgeschritten
Maximum carrier gas flow sccm 1.000.000
Probe gas flow FINE/GROSS sccm 180 / 90
Time constant of the leak rate signal s <1
Run up time min <3
Control inputs SPS Kompatibel (max.35V)
Status / Trigger outputs 8 x Relaiskontakte (max. 60V DC / 25V AC / 1A)
recorder output lin/log 0-10v
Recommended fore pump Membranpumpe, zweistufig
Power supply demand V (dc) 24
Typical power consumption Watt 100
Hose connectors mm 6
Type of protection IP 40
Dimensions (LxWxH) in 13 x 9.45 x 11×1
mm 330 x 240 x 280
Weight kg 4,5
lb 10
Part Number Description
540-001 WISE Technology T-Guard Sensor
Part Number Description
551-100 Display unit, table top use
551-101 Display unit, rack installation
551-102 Connecting cable, display unit, 5m
551-103 Connecting cable, display unit, 0.7m
590-571 Sensistor ILS500 F Leak Detection Filler
590-573 Sensistor ILS500 F-HP Leak Detection Filler, high pressure model
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