
Vigilant: Permanent Ultrasonic Monitoring of Steam Traps and Valves
Up to 30% of traps may be failed; a 3 mm leak can cost €6,000+/year. How SDT Vigilant delivers online diagnostics for critical traps and valves — European plant case (−25% steam loss, €120,000/year).

Source. SDT Ultrasound materials on Vigilant and steam trap/valve failure prevention.
Why routes alone are not enough
Up to 30% of traps may be failed at any time. A ~3 mm leak can waste €6,000+ per year. Route surveys with SDT340 cover the fleet; the most critical 5–10% stay blind between rounds.

What Vigilant does
Vigilant provides up to 8 channels of ultrasound/vibration plus process inputs. A contact sensor on a trap or valve flags blow-through or blockage in real time.


Equipment covered in this article

Vigilant - Permanent Ultrasound Monitoring
A permanent ultrasound monitoring system for critical equipment, 24/7
European plant case
In the first six months:
- −25% steam losses;
- €120,000 annual energy savings;
- fewer emergency interventions.
Mobile ultrasound remains for the rest of the fleet. KEG TRK — contact.
Equipment in this article
KEG TRK quotes prices and delivery times to Kazakhstan on request. We will prepare a commercial offer for your application.

Vigilant - Permanent Ultrasound Monitoring
A permanent ultrasound monitoring system for critical equipment, 24/7

SDT340 - Advanced Ultrasound Detector
The most advanced ultrasound detector for collecting, analysing and trending data
Also in this article: TRAPChecker - Steam Trap Testing
Read also
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Case Study: Auditing 420 Steam Traps at a Plant — How the SDT340 Recovered 78 Million Tenge a Year
A typical steam-system audit case using the SDT340: 420 traps, 23% faulty, a loss calculation, payback in 3 weeks, and a plan for an ongoing diagnostic program.
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How to test a steam trap: ultrasound and temperature
A steam trap is tested with two readings: temperature finds blocked traps, ultrasound before and after the trap finds steam blow-through. Signs by trap type, the procedure and steam losses.
7/22/2026
How to Survey Steam Traps with SDT Ultrasound: Step-by-Step Method
Practical steam trap survey method from SDT: upstream/downstream readings, temperature for failed closed, blow-through signatures, how to read the cycle. Field photos with SDT340.
