Magnetic Flux Leakage Probes

Thickness and Flaw Inspection Solutions

TFB - Attached

The magnetic flux leakage probes offer a superior high-saturation optimized magnetic design. Changeable wear rings improve wear resistance. These probes are ideal for air-cooler tubing inspection (with aluminum fins) and for circumferential crack detection.

Features

Superior high-saturation optimized magnetic design.
Improved wear resistance and changeable wear rings.
Can detect outside volumetric defects.
Suitable for air-finned coolers.

Faster is better - Available for shortest delivery times

The probes listed below are regularly stocked for quick delivery. If the probe you require is not indicated, consult the "Alternate probe diameter" column in the Tube Inspection Probe Catalog to find an alternate probe diameter.

Part ID

Rowspan=2

Item Number

Rowspan=2

Diameter

in.

TFB-120-N20

U8280231

0.472

TFB-132-N20

U8280135

13.2

0.520

TFB-170-N20

U8280137

0.669

TFB-179-N20

U8280111

17.9

0.705

TFB-187-N20

U8280246

18.7

0.736

TFB-198-N20

U8280361

19.8

0.780

TFB-242-N20

U8280099

24.2

0.953

Standard/Custom Probes (Made to Order)

Use the nomenclature and the chart below to configure your part number.

Chart TFB

Probe Type

Rowspan=2

Probe Diameter (use mm in part ID)

Colspan=3

Cable Length

Rowspan=2

Part Number Diameter

mm**

in.**

TFB: Magnetic flux leakage probe

Rowspan=11

120*

12.0

0.472

20 m (65 ft)
30 m (100 ft)

Rowspan=11

132*

13.2

0.520

161*

16.1

0.634

170*

17.0

0.669

179

17.9

0.705

187

18.7

0.736

198

19.8

0.780

229

22.9

0.902

242

24.2

0.953

283

28.3

1.114

296

29.6

1.165

_{* Smaller-diameter probes have less sentitivity to external defects, because the probe core section is much smaller than the tube section. However, the sensitivity to internal defects is still very high.}

_{** These probes have an overall diameter that is slightly larger than the part number reference.}

MFL Probe Selection Based on Tube Size

High-Saturation MFL Probe (TFB Model) Selection Guide for Common Carbon Steel Tube Sizes

Warning: If your tubes are dirty, a smaller probe might be required for the inspection. Evident is not responsible if you select a probe that is not compatible with your application. If you require assistance, please contact an Evident representative.

Example: For a one-inch tube with a wall thickness of 2.41 mm, the required probe would be TFB-187-N20. This probe has an overall diameter of 19.4 mm and changeable hardened steel half-rings.

Colspan=3

Probe ID Diameter - mm (in.)

Colspan=11

Tube Dimensions

Colspan=3

12.0 (0.472)

13.2 (0.520)

16.1 (0.634)

17.0 (0.669)

17.9 (0.705)

18.7 (0.736)

19.8 (0.780)

22.9 (0.902)

24.2 (0.953)

28.3 (1.114)

29.6 (1.165)

OD
mm (in.)

Rowspan=2

BWG

Rowspan=2

WT
mm (in.)

Rowspan=2

Overall Diameter (including wear system) - mm (in.)

Colspan=11

12.5
to 12.8 (0.49 to 0.50)

13.7
to 14.0 (0.54 to 0.55)

16.6
to 16.9 (0.65 to 0.66)

18
(0.71)

18.7
(0.73)

19.4
(0.77)

20.5
(0.81)

23.8
(0.94)

25.1
(0.99)

29.2
(1.15)

30.5
(1.20)

19 (0.75)

Rowspan=4

1.65 (0.065)

●

2.11 (0.083)

●

2.41 (0.095)

●

2.77 (0.109)

●

25.4 (1.0)

Rowspan=8

1.65 (0.065)

●

1.83 (0.072)

●

2.11 (0.083)

●

2.41 (0.095)

●

2.77 (0.109)

●

3.05 (0.12)

●

3.40 (0.134)

●

3.76 (0.148)

●

31.75 (1.25)

Rowspan=4

2.41 (0.095)

●

2.77 (0.109)

●

3.05 (0.12)

●

3.40 (0.134)

●

38.1 (1.5)

Rowspan=4

2.77 (0.109)

●

3.05 (0.12)

●

3.40 (0.134)

●

3.76 (0.148)

●

Wear System

colspan=3

Carbide beads (fixed)

colspan=3

Hardened steel half-rings (changeable)

colspan=8

● This is the recommended probe size.

Δ This size can be used if you do not have the recommended size.