Hach Flo-Dar Bedienungsanleitung Seite 15

Review the guidelines that follow to find the best location for the sensor.
• Examine the upstream and downstream flow characteristics. Use a mirror if necessary. Install the
sensor above the water where the flow is stable. Do not install the sensor where there are
standing waves, pools or objects or materials that can disrupt the flow profile.
• If the upstream flow characteristics are acceptable, install the sensor on the upstream wall of the
manhole with the sensor pointing upstream. This location will make sure that the measured flow is
the same as the flow in the pipe and that the sensor cable points away from the wall.
• Install the sensor away from the sides of the pipe and in the very center of the flow where the fluid
is at the maximum depth.
• Install the sensor in a location that is accessible for maintenance.
Items to collect:
• Assembled frame and wall mount bracket assembly
• Anchors with nuts and washers
• Tools: mirror, ruler or tape measure, marker
Complete the steps to install the frame on the wall of the manhole above the flow. Make sure to obey
all codes and/or directives that are relevant to the location. Refer to
on page 9.
1. Make a mark on the wall that identifies the location of the top of the sensor frame. Refer to
Figure 11. The wall brackets will be installed above and below this mark.
• Sensor without SVS—make sure that when the sensor is in the frame, the radar beam is not
stopped by the wall or channel. Refer to
• Sensor with SVS—the top of the sensor frame must be installed at an exact distance above the
top of the channel. For pipe diameters that are more than 635 mm (25 in.), measure 127 mm
(5 in.) from the interior crown of the pipe to the top of the frame. For pipe diameters that are
less than 635 mm (25 in.), measure 152.4 mm (6 in.) from the interior crown of the pipe to the
top of the frame.
2. Put the wall mount brackets above and below this mark.
3. Attach the brackets to the wall using the supplied anchors. Install the anchors into 3/8-in.
diameter holes at a depth of 38.1 mm (1.5 in.).
4. Connect the frame to the wall bracket with a spacer. Refer to
use the 12-inch spacer to position the sensor farther from the wall when there is a large pipe lip.
Site location guidelines
Figure 13 on page 18.
Figure 11. It may be necessary to
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