Teledyne 4250, Installation And Operation Manual, Page: 97 / 204

4250 Flow Meter
Section 3 Installation
3-7
3.3 Flow Meter Mounting
and Installation
The 4250 Flow Meter is a portable device; you may install it per-
manently or temporarily. You can suspend the flow meter in tem-
porary installations, such as sewers, or mount it permanently in
other installations, such as treatment plants, at your option.
CAUTION
Before any flow meter is installed, the proper safety precau-
tions must be taken. The discussions of safety procedures pro-
vided in the back of this manual are only general guidelines.
Each situation in which you install a flow meter varies. You
must take into account the individual circumstances of your
installation. Additional safety considerations, other than those
discussed, may be required.
3.3.1 Carrying Handle To help carry or suspend the flow meter, a handle is provided in
the accessory package. To use the handle, clip the hooks at both
ends onto the two metal brackets at the top of both side of the
case.
3.3.2 Location of the Flow
Meter
Because the flow meter uses an AV sensor for flow measurement,
you do not have to install it directly above the measurement
point, or even particularly close to the flow stream. You can
install the flow meter in a convenient, protected location and
route the AV sensor cable to the place where the level sensor is
mounted. For example, you can install the flow meter above
ground for protection and easy accessibility, and then you only
need to enter the manhole for sensor installation and calibration
(and occasionally thereafter for maintenance and inspection).
You will need to mount the unit within 25 feet (7.6 m), (or 50 feet
[15.3 m] with the 30 foot sensor) if you connect the sensor
directly to the flow meter.
WARNING
The 4250 Flow Meter has not been approved for use in
hazardous locations as defined by the National Electrical
Code.
You can extend the distance to 50 feet (15.3 m) if you use the
optional
25-Foot Extension Cable . Connecting two extensions
together lets you increase the distance to 75 feet (22.8 m). Do not
exceed 75 feet with the extensions; this will slow the response of
the sensor to level and atmospheric changes.
For distances from 75 to 1,000 feet, (304.8 m) use the optional
Quick-Disconnect Box . Distances greater than 1,000 feet are
not recommended. Details on the extension cable and Quick-Dis-
connect Box can be found in Section 4.
3.3.3 Mounting the 4250
The 4250 does not have any special requirements for mounting.
You can locate it on any relatively flat surface either horizontally,
supported by the two mounting pads and the stainless steel
mounting bracket, or vertically, supported by the two plastic rails
on the bottom of the case.