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SKF CMIN 400-K Ultrasonic Probe

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  • Detects pressure and vacuum leaks, including compressed air 
  • Checks steam traps and valves quickly and accurately 
  • Detects arcing, tracking and corona in electric apparatus 
  • Tests bearings, pumps, motors and compressors 
  • Frequency response: 20 to 100 kHz (centred at 38 to 42 kHz) 
  • Indicator: 10–segment LED bar graph (red)
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SKF CMIN 400-K Ultrasonic Probe

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Product Information

SKF Inspector 400 Ultrasonic Probe CMIN 400-K


Easy detection of high frequency sounds

The SKF Inspector 400 Ultrasonic Probe (CMIN 400-K) senses high frequency sounds produced by operating equipment, leaks and electrical dis- charges. It electronically translates these signals by a heterodyning process, making them audible, so that a user can hear these sounds through a headset and see them as intensity increments on a meter.


The SKF Inspector 400 Ultrasonic Probe (CMIN 400-K) can complement your condition monitoring program by providing you with the following capabilities:

Pressure/Vacuum leaks

As any gas (air, oxygen, nitrogen, etc.) passes through a leak orifice, it generates a turbulent flow with detectable high frequency components. By scanning the test area with the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K), a leak can be heard through the headset as a rushing sound or noted on the meter bar graph indicator. The closer the instrument is to the leak, the louder the rushing sound and the higher the meter reading. Should ambient noise be a problem, a rubber focusing probe may be used to narrow the instrument’s reception field and to shield it from conflicting ultra sounds.



Valve activity such as leakage or blockage can be accurately checked while the valve is on line. Properly seated valves are relatively quiet while leaking valves produce a turbulent flow as the fluid moves from the high pressure side through the leak to the low pressure side. Due to a wide sensitivity and ultrasonic frequency, all types of valves even in noisy environments can be accurately tested.


Valve stems

Valve stems may be quickly tested for leaks to atmosphere.


Steam trap inspection

Major steam trap manufacturers have recommended ultra sound inspection of steam traps as one of the most reliable methods available. By converting the ultrasonic elements of a working steam trap into the audible range, the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K) allows users to hear through headphones and see on a meter the exact condition of a steam trap while it is on line. Blowby, machine gunning, over sized traps or line blockage are all easily detected.


The SKF Inspector 400 Ultrasonic Probe (CMIN 400-K) markedly reduces confusion from extraneous sounds or from heat transfer, even when traps are extremely close together.


Electrical inspection

Arcing and corona discharge emit ultra sounds at the site of emission. This electrical discharge can be located quickly by scanning the area with the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K). The signal is heard as a frying or buzzing sound in the headset. As with pressure or vacuum leak detection, the closer the instrument is to the discharge, the more intense the signal.


Test switch gear, transformers, circuit breakers, buss bars, relays, junction boxes, insulators and other electrical gear.


General mechanical inspection

The SKF Inspector 400 Ultrasonic Probe (CMIN 400-K) can detect the early stage of a machine’s mechanical malfunction. NASA research has demonstrated that ultrasound monitoring will locate potential bearing deficiencies before they are detected by the traditional heat and vibration methods. With the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K), users hear the sound quality of a bearing as well as monitor amplitude changes on the meter. This complements other monitoring instruments and adds to the ability to trend, troubleshoot, and confirm potential bearing problems.


General mechanical inspection is easy with the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K) and with very little training, users can learn to test bearings within minutes. Current vibration programs can achieve enhanced diagnostic ability with the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K).


Prevent over-lubrication with the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K) by simply lubricating only until the meter reaches a specified level. Over lubrication is one of the more common causes of bearing failure.


General mechanical inspection of pumps, motors, compressors, gears and gear boxes: all types of operating equipment may be inspected with the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K). Since the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K) works in a high frequency, short wave environment, problems such as cavitation in pumps, compressor valve leakage, or missing gear teeth may be heard and isolated. Reciprocating compressor valve analysis has also become successful with the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K) and therefore many engine analyzer companies now offer instruments with an ultrasonic input port.

Heat exchangers, boilers and condensers


In-leakage or pressure leakage can be readily located with the SKF Inspector 400 Ultrasonic Probe (CMIN 400-K). Fittings, valves and flanges are all easily scanned for leakage. The high frequency, short wave nature of ultrasound allows operators to pinpoint the location of a leak in high noise environments.


Condenser tubes and heat exchanger tubes may be tested for leakage through two methods: vacuum and pressure.



The tube sheet is scanned for the tell-tale rushing sound produced as the leak draws air into the tube.



Additional testing may be performed when the system is off-line utilizing air pressure around the tube bundle and scanning for the rushing sound produced from the leaking tube.


  • Pressure and vacuum leak detection
  • Valve seat leak detection
  • Exhaust system leaks
  • Heat exchangers, boilers, condensers
  • Steam trap inspection
  • Bearing testing
  • Gear/Gearbox inspection
  • General mechanical inspection and troubleshooting
  • Tanks, pipes, etc., leak testing

What's In The Box

  • SKF Inspector 400 Ultrasonic Probe pistol housing with LED bar graph meter, eight-position sensitivity selection, low battery indicator
  • Scanning module
  • Rubber focusing probe
  • Stethoscope module
  • Lightweight foam lined headset
  • 9 V alkaline battery (replaceable)
  • Cordura/Nylon soft pack carrying case
  • Comprehensive instruction manual (English language)


Description SKF Inspector 400 Ultrasonic Probe
Frequency response 20 to 100 kHz (centred at 38 to 42 kHz)
Indicator 10 segment LED bar graph
Sensitivity selection 8-position precision attenuation
Power 9 V alkaline battery
Headset Lightweight foam lined double headset wired monophonic impedance; 16 Ω
Response time 300 m/s
Ambient operating temperature range 0 to 50 °C (30 to 120 °F)
Relative humidity 10 to 95% non-condensing at up to 30 °C (85 °F)
Dimensions 203 x 50 x 133 mm (8.00 x 2.00 x 5.25 in.)
Weight 320 g (11 oz.)

SKF CMIN 400-K Product Specifications Summary:
(for full specs please see the full specs tab or the data sheet)

Leakage Detectors/Ultrasonic Leak Detectors Template

Medium DetectedAir 

Test Equipment General Attributes

Unique FeaturesDetects pressure and vacuum leaks, including compressed air
Power Supply VoltageBattery Powered
Product Weight320 GRAMS (0.7055 LBS)
Battery Type9v 
Country of OriginUnited States
Other Information

Dimensions:: 203 x 50 x 133 mm



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