SDT200 — Entry-Level SDT Ultrasound Detector

Overview

The SDT200 is a handheld ultrasound detector from the Belgian company SDT. It picks up ultrasound up to 100 kHz, shifts it into the audible range for headphones and at the same time shows the signal level in dBµV. The operator therefore not only hears a defect but also gets a number that can be compared with the previous reading.

The housing contains an airborne ultrasound sensor and an infrared pyrometer with a laser pointer. Other sensors connect through a LEMO socket and are recognised automatically. Measurements are stored in the instrument and uploaded to DataDump software.

The SDT200 suits sites that are starting out with ultrasound: leak detection, bearing checks, electrical panel inspection. As the scope grows, users move to the SDT270 or SDT340.

What the SDT200 does

Ultrasound

• Bandwidth up to 100 kHz, 256 kSps sampling at 16-bit resolution
• Indicators: RMS, Max RMS, Peak and Crest Factor, refreshed every 250 ms
• Gain 0 to +90 dB in 10 dB steps, range -10 to +110 dB
• Heterodyne listening; the mixer frequency is set from the recognised sensor

Temperature

• Non-contact IR pyrometer, -40 to +380 °C
• Accuracy ±0.5 °C between 0 and 50 °C
• Adjustable emissivity from 0.01 to 1, 10° field of view
• Class II laser pointer

Data

• 100 measurement nodes, 4,000 measurements in total
• Signal recording up to 10 seconds at 8 kSps
• Each reading is linked to the operator and sensor
• USB upload to SDT DataDump

Sensors

Sensor	Type	Tasks
Built-in intUS1	airborne	leaks, electrical
FLEX ID2	airborne, flexible	leaks, electrical, tightness
PARADISH2	parabolic	electrical and leaks at a distance
RS2T	contact, threaded	mechanics, steam traps
RS2NL 100/300/500	contact, needle	mechanics, valves, hydraulics
LUBESense1	contact	bearing lubrication

Typical tasks

• Compressed air leaks. Surveys of mains, fittings and pneumatic tools. Each leak gets a tag, a dB level and a place in the report.
• Bearings. A reading at the same point once a month. A rise of 8 dB or more above baseline usually indicates lack of lubrication; 16 dB or more points to a developing defect.
• Lubrication. With LUBESense1, grease is added in small shots and the technician stops when the ultrasound level no longer falls.
• Electrical. Corona, tracking and arcing in cabinets and switchgear without opening doors, through vents and gaps.
• Steam traps and valves. A contact sensor shows whether a trap cycles normally or passes steam.

Comparison with other SDT instruments

Feature	SDT200	SDT270	SDT340
Ultrasound	up to 100 kHz	up to 100 kHz	20–50 kHz, focUS up to 256 kHz
Channels	1	2	2
IR temperature	Yes	Yes	Yes
Tachometer	No	Yes	Yes
Vibration (ICP)	No	Yes	Yes
Software	DataDump	DataDump or UAS3	UAS3
Signal recording	up to 10 s	up to 80 s	~7 h at 128 kHz
Display	LCD 128×64	LCD 128×64	colour TFT 3.5"

Technical specifications

Parameter	Value
Ultrasound bandwidth	up to 100 kHz
Sampling rate	256 kSps, 16-bit ADC
Measuring range	-10 to +110 dB
Built-in sensor sensitivity	-65 dB/V/µbar at 40 kHz
Input	1 channel, 7-pin LEMO
Display	backlit graphic LCD 128×64
Keypad	12 function keys
Communication	USB Mini
Battery	NiMH 4.8 V, 4600 mAh, about 8 hours
Charging time	5–6 h (fast mode)
Operating temperature	-15 to +48 °C
Protection	IP30
Housing	extruded aluminium, fluorosilicone holster
Dimensions	226 × 90 × 40 mm
Weight	770 g with battery and holster
Headphones	Peltor, 25 dB NRR
Warranty	lifetime (SDT terms)

Model status

According to SDT, production of the SDT200 ATEX version and regular firmware updates ended in 2024. Instruments in service remain covered by the manufacturer's lifetime warranty. For new projects we select a replacement for the task:

• routes and equipment trends — SDT270 or SDT340;
• leak detection only — LEAKChecker;
• bearing lubrication only — LUBEChecker;
• a simple general-purpose detector — ULTRAChecker.

Supply and service in Kazakhstan

KEG TRK is SDT's official partner in Kazakhstan. We help select the instrument and sensors, train staff and handle warranty repairs. If you already own an SDT200, we can supply compatible sensors or help you move to the SDT270 or SDT340. Price on request.