Mechanical Installation - Hach AF7000 SCM Manuel D'utilisation De Base

Installation guidelines
This instrument is rated for an altitude of 2000 m (6562 ft) maximum. Use of this instrument at an
altitude higher than 2000 m can slightly increase the potential for the electrical insulation to break
down, which can result in an electric shock hazard. The manufacturer recommends that users with
concerns contact technical support.
• For best results, the pH of the sample must be reasonably constant or controlled before
coagulation.
• Install the instrument as near to the sample mixer as possible. The sample measurement must
occur within 30 seconds after the coagulant is fully mixed with the sample at all expected flow
rates.
• Install the instrument as near to the point of chemical addition (coagulant and pH adjustment) as
possible and make sure that the sample is well-mixed when measured. Typically, this means that
the instrument is installed in a location where the sample will reach the instrument within
30 seconds of chemical addition at all expected flow rates.
• Installation of the instrument indoors is recommended. Install the instrument in a relatively dust-
free location away from direct sunlight.
• If the instrument is installed in an outdoor environment, put the instrument in an enclosure that
supplies protection from precipitation and direct sunlight. The enclosure must also supply good
ventilation and temperature control.
• Make sure that there is sufficient drainage for any sample that flows through the overflow ports.
• Make sure that sufficient airflow is supplied around the motor so that the motor does not become
too hot.
• Make sure that the sample flow is more than 1 L/minute. A flow rate of 2–4 L/min is recommended.
A sample flow more than 4 L/min will cause water to leak from the weep hole in the piston shaft.
• If the sample water contains sand or fibrous material, install an inlet filter (Y-strainer). A 40-mesh
strainer is sufficient for most applications.

Mechanical installation

Attach the instrument to a wall
Personal injury hazard. Instruments or components are heavy. Use assistance to install or move.
Attach the instrument vertically to a wall or structure that is able to hold at least 86 kg (190 lb) of
downward force. Make sure that there is sufficient airflow around the motor.
User-supplied hardware:
• Four bolts, 10 × 40 mm (7/16 × 1.5 in.)
Figure 2 shows the installation dimensions.
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