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PCM

Operation Manual 15

dBmA

Distance

Figure 4.9: dBmA fault graph

In gure 4.10, the line marked ‘A’ to ‘E’ is the data

collected, whilst the line ‘1’ to ‘4’ is the interpreted data.

Note that at position ‘A’ the current falls and then returns

to almost its original level. This is probably due to eld

distortion of the locate signal possibly caused by another

utility line above the pipeline and should be ignored or

further investigation undertaken.

Steps ‘B’ to ‘E’ show denite steps (with some eld

distortion at the point of fault) and loss of signal. Note

the recovered reading is less than the signal before the

trouble.

Further investigations using the PCM

A-Frame should

now be undertaken so as to pinpoint the exact position

of the faults.

Figure 4.10: Collected data and interpreted results

0 200 400 600

Distance

Same level

Different levels

Table of Contents3
Section 1 - Introduction5
About this Manual5
Manual Outline5
Overview of the PCM System5
Section 2 - Transmitter Functions7
Transmitter Control Panel7
Frequency Select7
Output Current Select7
Figure 2.1: Tx Facia7
Figure 2.2: Frequency Selector7
Warning Lights and Indicators8
Display8
Signal Connection8
Figure 2.3: Rectifier Connection to Pipeline9
Figure 2.4: PCM Connection to Pipeline9
Power Supply Connections10
Figure 2.5: PCM Connection Using Test Point10
Figure 2.6: PCM Connection Using Sacrificial Anode for Grounding10
Section 3 - Receiver Operation12
Control Panel and LCD Features12
Figure 3.1: Receiver Controls12
Software Revision and Calibration Date13
Setting Controls13
Batteries13
Operating Frequency Modes13
Depth Measurement14
Locate Current14
Recording Measurements14
Section 4 - Basic Locating16
Pinpointing a Target Line16
Peak Procedure16
Null Procedure16
Depth and Current Measurement16
Figure 4.1: Peak Mode16
Current Direction17
Mapping Current Measurements17
Figure 4.3: Pipeline Current Flow17
Figure 4.4: Pipeline Current Flow17
Figure 4.5: Pipeline Fault17
Using Dbma for Pipeline Current Mapping18
Figure 4.6: Ma Fault Graph18
Figure 4.7: Dbma Fault Graph18
Figure 4.8: Ma Fault Graph18
Figure 4.9: Dbma Fault Graph19
Figure 4.10: Collected Data and Interpreted Results19
Section 5 - Taking Measurements20
Pipelines and Distribution Systems20
Figure 5.1: Tie Line 120
Figure 5.2: Tie Line 220
Figure 5.3: Loop20
Figure 5.4: Looped System 120
Figure 5.5: Looped System 220
Pipelines and Pipeline Defects21
Figure 5.6: Distributed System21
Figure 5.7: Interpreting Distributed Systems21
Figure 5.8: Poor Coated Steel Shield21
Figure 5.9: Perfect Coating21
Section 6 - Applications22
Parallel Pipes22
Figure 6.1: Parallel Pipes Example 122
Figure 6.4: Example 2 Interpretation23
Figure 6.5: Parallel Pipes Example 323
Figure 6.6: Example 3 Interpretation23
Figure 6.7: Angled Pipes Example 123
Figure 6.8: Parallel Pipes Example 424
Figure 6.9: Parallel Pipes Example 524
Section 7 - PCM + A-Frame25
About the A-Frame25
Operation25
Comparing Fault Severity26
Saving PCM FF Readings26
Data Upload - PCM FF Data26
Section 8 - Interpreting Results27
Introduction27
Avoiding Errors27
Identifying Interference27
Locate Current27
PCM + Current27
Direction Arrows27
Interpreting Survey Results28
For the PC and PDA29
Section 10 - Appendix30
Technical Specifications30

Brand	SPX
Model	Radiodetection PCM+
Category	Water Pump
Language	English

SPX Radiodetection PCM+ User Manual

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