Hach Flo-Dar, User Manual

Page: 9 / 44

7
General information
Definition of a confined space:
A confined space is any location or enclosure that presents or has the immediate
potential to present one or more of the following conditions:
• An atmosphere with less than 19.5% or greater than 23.5% oxygen and/or more than
10 ppm Hydrogen Sulfide (H
2
S).
• An atmosphere that may be flammable or explosive due to gases, vapors, mists, dusts
or fibers.
• Toxic materials which upon contact or inhalation, could result in injury, impairment of
health or death.
Confined spaces are not designed for human occupancy. They have restricted entry and
contain known or potential hazards. Examples of confined spaces include manholes,
stacks, pipes, vats, switch vaults, and other similar locations.
Standard safety procedures must always be followed prior to entry into confined spaces
and/or locations where hazardous gases, vapors, mists, dusts or fibers may be present.
Before entering any confined space check with your employer for procedures related to
confined space entry.
2.1.4 FCC regulations
Use of this device is subject to the following conditions:
• There are no used serviceable items in this device.
• The user must install this device in accordance with the supplied installation
instructions and must not modify the device in any manner whatsoever.
• Any service involving the transmitter must only be performed by Hach Company.
• The user must ensure that no one is within 20 cm of the face of the radar transmitter
when operating.
2.2 Product overview
The Flo-Dar Sensor measures the flow velocity and liquid depth in open channels using
radar and ultrasonic technology. The unit is designed to withstand submersion during
surcharge conditions. The optional surcharge velocity sensor provides velocity
measurements during surcharge conditions.
Figure 1 on page 8 shows the configuration of a Flo-Dar system in a non-hazardous
location.