SDT270 — SDT Ultrasound Detector and Data Collector

Overview

The SDT270 is a handheld ultrasound instrument from the Belgian company SDT, designed for predictive maintenance programmes. One housing combines an ultrasound detector, an infrared thermometer, a laser tachometer and an accelerometer input. The operator walks a route, takes readings at each point and uploads them to Ultranalysis Suite 3, where trends are built, alarm thresholds are triggered and recorded signals are examined in the time and frequency domains.

The instrument has been on the market for years and is well known at industrial sites. It is chosen when a reliable data collector is needed for mechanics, lubrication, leaks and electrical inspection, and the colour screen and extended analytics of the SDT340 are not required.

What the SDT270 measures

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 from 0 to +90 dB in 10 dB steps
• The built-in airborne sensor meets Class I of ASTM E1002-11 for gas leak detection
• Heterodyne listening: the mixer frequency is set automatically from the recognised sensor

Temperature

• Non-contact IR thermometer, -70 to +380 °C
• Accuracy ±0.5 °C between 0 and 50 °C
• Adjustable emissivity from 0.01 to 1, 10° field of view

Rotational speed

• Optical tachometer with a Class II red laser
• About 10 to 99,999 RPM at a distance of 50 to 2000 mm
• Requires a reflective tape on the shaft

Vibration

• Works with any 100 mV/g ICP accelerometer
• Acceleration in g, velocity in mm/s or in/s, up to 20 g peak
• Filters 10 Hz–1 kHz (8 kSps) and 10 Hz–10 kHz (32 kSps)

Versions and data handling

Version	Software	Static data	Dynamic recordings
SDT270 SS	DataDump	100 nodes, 4,000 measurements	No
SDT270 SD	DataDump	100 nodes, 4,000 measurements	Yes
SDT270 SU	UAS3	10,000+ nodes	No
SDT270 DU	UAS3	10,000+ nodes	up to 6,675 s in total

A single dynamic recording lasts up to 80 seconds at 8 kSps. The version can be upgraded later through a licence update, without replacing the instrument.

For a full monitoring programme we usually recommend SU or DU: routes, thresholds and trends are stored in UAS3, and every reading is traceable to the operator and sensor.

Sensors

The SDT270 recognises the connected sensor automatically and selects the filters.

Sensor	Type	Tasks
RS2T	contact, threaded	mechanics, steam traps
RS2NL 100/300/500	contact, needle	mechanics, valves, hydraulics
LUBESense1	contact	bearing lubrication
FLEX ID2	airborne, flexible	leaks, electrical, tightness
PARADISH2	parabolic	electrical inspection at a distance
TTS2	airborne, enclosed	tank tightness tests
ICP 100 mV/g (Hansford)	accelerometer	mechanics

The ATEX version uses ATEX sensors: RS1T, RS1NL, FLEXEX, TTS1.

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"

See also: SDT340, SDT200, Ultranalysis Suite 3.

Applications

• Mechanics. Ultrasound trends on bearings of pumps, fans, gearboxes and conveyors. A rise of 8–12 dB above baseline usually points to a lubrication problem; 16 dB or more suggests a developing defect.
• Lubrication. With the LUBESense1 sensor, the technician adds grease in small shots and stops when the ultrasound level no longer falls, so the bearing is not over-greased.
• Leaks. Compressed air, nitrogen, vacuum, steam. Each leak found goes into a report with an estimate of losses.
• Electrical. Corona, tracking and arcing in switchgear, on insulators and in substations. With PARADISH2 the survey is done from a safe distance.
• Steam traps and valves. A recorded signal shows whether a trap cycles normally, passes steam or is blocked.
• Tightness. Hatches, doors, windows and tanks are tested with an ultrasound generator. A kit based on the SDT270 is used in the marine sector (Lloyd's Register certificate No. 17/30042 for the Sherlog kit).

Technical specifications

Parameter	Value
Ultrasound bandwidth	up to 100 kHz
Sampling rate	256 kSps, 16-bit ADC
Measuring range	-10 to 109 dBµV (with gain)
Inputs	2 channels, 7-pin LEMO
Display	backlit graphic LCD 128×64
Keypad	12 function keys
Communication	USB; Ethernet 10/100 (Standard version only)
Battery	NiMH 4.8 V, 4000 mAh, about 8 hours
Charging time	5–6 h (fast mode)
Operating temperature	-15 to +60 °C
Protection	IP30
Housing	extruded aluminium, fluorosilicone holster
Dimensions	226 × 90 × 40 mm
Weight	830 g with battery and holster
Headphones	Peltor, 25 dB NRR
Warranty	lifetime (SDT terms)

What is included

The kit depends on the tasks: mechanics, lubrication, leaks or electrical. A basic set usually includes:

• SDT270 instrument in a protective holster;
• one or more sensors for the selected tasks;
• Peltor headphones;
• USB cable and charger;
• carrying case;
• DataDump or Ultranalysis Suite 3 licence, depending on the version.

We configure the exact kit and price for your equipment. Price on request.

Supply and training in Kazakhstan

KEG TRK is SDT's official partner in Kazakhstan. We help choose the version and sensor set, supply the instrument, set up routes in UAS3 and train your staff in ultrasound inspection. If you already own an SDT270, we can help update the firmware, extend the licence or select additional sensors.