Hach Flo-Dar, Руководство пользователя

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19
Installation
3.2.2.2 Install the frame on the wall
DANGER
Explosion hazard. Review the safety information in
2.1.3 Confined space
precautions on page 6 before entering a confined space.
DANGER
Danger d'explosion. Revoyez les informations concernant la sécurité à la section
2.1.3 à la page 8 avant d'entrer dans un espace restreint.
Sensor location guidelines
Review the following guidelines 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 steady. 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.
Prerequisites
• Frame and wall mount bracket assembly (assembled in section 3.2.2.1 on page 17 )
• Anchors with nuts and washers
• Tools: mirror, ruler or tape measure, marker
Procedure
Complete the steps to install the frame on the wall of the manhole above the flow. Be
sure to follow all codes and/or directives that are relevant to the location (refer to
3.2.1 on
page 12 ).
1. Make a mark on the wall that identifies the location of the top of the sensor frame
(
Figure 9 ). The wall brackets will be installed above and below this mark.
• Flo-Dar without SVS—make sure that when the sensor is in the frame, the radar
beam will not be blocked by the wall or channel (
Figure 11 ).
• Flo-Dar with SVS—the top of the sensor frame must be installed at an exact
distance above the top of the channel. For pipe diameters greater than 25 inches,
measure 5 inches from the top of the channel to the top of the frame. For pipe
diameters less than 25 inches, measure 6 inches from the top of the channel to
the top of the frame.
2. Position 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
-inch diameter holes at a depth of 1½ inches.
4. Connect the frame to the wall bracket with a spacer as shown in Figure 9 . The
12-inch spacer may be necessary to position the sensor farther from the wall when
there is a large pipe lip.