Near Field Probes

Near Field Probes
TRD series probes
Features
■■ Ideal for carbon steel fin-fan tubes
■■ No need for a reference probe or extension
■■ Excellent detection of internal corrosion and
axial cracks based on sensitivity of eddy
current to lift-off (or fill-factor)
Standard near field testing probe with stainless steel casing
Lead RX coil
Driver coil
Trail RX coil
■■ Absolute and differential channels
■■ High-quality amplitude-based signals for
very fast and simple data analysis
■■ Thick stainless-steel casing for increased
wear resistance
Eddy Current on
thin ID layer only
■■ Compatible with the MultiScan MS 5800R
instrument
NOTE: These probes are not designed to detect OD defects
or circumferential cracks.
Sensitivity zone
The all-new near field technique (NFT) eddy current technology is a rapid and inexpensive
inspection solution designed specifically for ID defect detection in carbon steel fin-fan
tubes. NFT probes cut costs and improve ease of use because they do not require expensive
and cumbersome externally referenced coils.
This new technology, which is based on a simple eddy current driver/pickup design, provides signals that are very easy to analyze. Because NFT probes operate within the same
frequency range as remote field technique (RFT) probes, NFT probes are manufactured for
use with the standard MultiScan MS 5800 RFT connector.
NFT Signal
Tube cut
60% ID
groove
0.25 in. hole
40% ID
groove
Corroded tubes pulled from service
Typical calibration data
920-134A-EN
Probe Part Number Example
Near field probe model (TRD), 17.0 mm diameter (170), 300 Hz center frequency (300), nylon-type standard cable (N), 30-meter cable
length (30).
TRD-170-300-N30
Probe diameter (17 mm)
Cable Length (30 m)
Also available: 20 m
Probe Outside Diameter
Standard probe diameters are available from 16.0 mm (0.63 in.) to 28.0 mm (1.10 in.). The part number shows the diameter in tenths of
a millimeter (1/10 mm): therefore, 17.0 mm = “170”. The standard diameters available are listed in the chart below:
Probe diameter (catalog)
160
170
180
220
240
260
280
300
Diameter value
16.0 mm (0.63 in.)
17.0 mm (0.67 in.)
18.0 mm (0.71 in.)
22.0 mm (0.87 in.)
24.0 mm (0.94 in.)
26.0 mm (1.02 in.)
28.0 mm (1.10 in.)
30.0 mm (1.18 in.)
Probe Center Frequency
The only available central frequency is 300 (300 Hz) and the frequency range is from 100 Hz to 1 kHz.
Probe Cable
Probe cable material is nylon (N) only.
Cable lengths are in meters: 30 m (100 ft) is the most common length. Also available in a 20 m (65 ft) length.
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NFT_Probe_0803 • Printed in Canada • Copyright © 2008 by Olympus NDT.
All specifications are subject to change without notice. All brands are trademarks or registered trademarks of their respective owners.