DMTA-10040-01EN, Rev. E, February 2018
Chapter 5
216
The subtracting frequency should be at least half of the prime frequency. However,
since the NORTEC 600 allows fully independent frequencies, the best results are
obtained with a ratio of 4:1 between the highest and lowest frequency. This section’s
procedure has been prepared with frequency 1 as the highest frequency, though the
NORTEC 600 will function equally as well with frequency 2 as the highest frequency.
Inspection materials are shown in Figure 5-135 on page 216.
Figure 5
‑
135 Materials—dual frequency for heat exchanger tubing
The following products are used in this procedure:
•
Eddy current bobbin probe for heat exchanger tubing: absolute/differential,
14.8 mm (0.583 in.) diameter, 15 kHz center frequency, 20 m (65.6 ft) cable;
P/N: TEA-148-015-N05 [U8282109]
Cable—part 3 of
foot switch
Auxiliary absolute
tube adaptor
EC bobbin probe
Foot switch—part 1
Connector—part 4
of foot switch
Cable—part 2 of foot switch
Calibration tube with ring
Top of instrument
Содержание nortec 600
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