Special Applications; Locating Non-Metallic Pipes And Sewer Lines; Taking Depth Measurements; Advanced Locating Techniques - Two Person Swap - Amprobe UAT-505 Manual De Usuario

4. SPECIAL APPLICATIONS

4.1. Locating Non-Metallic Pipes and Sewer Lines

The UAT-500 locator can indirectly trace non-metallic conduits and pipes.
1. Insert fish tape or wire inside the conduit or pipe. For sewer lines, use the sewer drain cleaning machine to insert
a cleaning cable.
2. Follow steps as described in the Direct Test Leads Connection Mode – Tracing an Individual Pipe or Cable
section 3.5. Connect the red test lead to the fish tape or the drain cable.
The Receiver will pick up the signal conducted by the fish tape or wire, indicating the location of the non-metallic pipe.

4.2. Taking Depth Measurements

Depth measurement is only available when the Receiver is set to
33 kHz frequency. It is NOT available in 50/60 Hz or Radio Modes.
To take a depth and current measurement, first pinpoint the position
of the line. Place the tip of the Receiver on the ground making sure it
is vertical and across the line. Press and hold the
" " button until the screen changes to display a dialog box.
Checking for depth errors due to signal distortion
One way to determine if the depth measurement is likely to have been affected by distortion is to take a depth
reading at ground level, then raise the Receiver a known distance off the ground (such as one foot). Retake the
depth reading at the new depth and confirm that the depth has increased by this amount. If the depth has changed
by something other than the actual change, then the readings should be treated as suspect.
Distorted signals will cause the located line position to be displaced from the actual position. The errors are more
pronounced using the arrows in Null Mode than the Peak Mode bar graph. Hence, if the arrow/null position and peak
bar graph position indicate differently, the signal likely distorted and the readings should be treated with caution.
�WARNING
Never mechanically dig over the path of a buried pipe or cable. Always dig carefully.
4.3. Advanced Locating Techniques – Two Person Swap
1. Set up the Transmitter as described in the Induction Mode – Locating Utilities section 3.4.
2. Turn the Receiver on by pressing the power button for two seconds and select 33 kHz frequency by pressing
button.
3. Select the area to be checked. One person holds the Transmitter with the handle in line with the direction of
movement and the other holds the Receiver (as shown below).
4. Stand at least 15 feet (5 m) apart holding the equipment as below, with the Transmitter and Receiver in line with the
direction of movement.
5. Adjust the sensitivity of the Receiver so that the meter reads approximately 20% signal strength.
6. Walk slowly across the site keeping parallel with each other. As a service is approached, the signal level on the
Receiver will increase. When the signal is at a maximum, stop the Transmitter and place it on the ground. Then
pinpoint the position of the service with the Receiver as described in the Receiver Locating section 3.1. Mark this
position and plot the route across the site if necessary.
7. Continue to the sweep across the site and then, if possible, repeat the process at 90 degrees to the sweep
already completed.
18
262
3'11"
3.45mA