In potable water applications, if the chemical solution is injected
into a full, turbulent flowing pipeline, a complete mix should
o
ccur within a matter of seconds and a relatively short distance
(10-20 times the pipe’s diameter). It is very important that the
chemical solution be injected into the center one-third of the
pipeline. Under variable flow conditions such as open channels
or pipelines that are not flowing full, external mixing devices
(static mixers, mechanical mixers, flash mixers, propeller mixers,
etc.) are necessary to ensure a complete, thorough mix. These
devices should always be located just after the chemical
injection point and, to prevent off-gassing and corrosion, it is
E
SSENTIAL that the chemical solution be injected directly into
the water stream, NOT above it.
B) THE IMPORTANCE OF LAG TIMES
(See Drawing Nos. 2, 3, 4, and 5)
In a closed loop system, it is extremely important to keep the
total system hydraulic lag time within acceptable parameters,
resulting in slow, non-erratic deviations and a smooth
adjustment cycle for the SMARTVALVE when responding to
the residual analysis. In systems with variable water flow, the
lag time will also vary. Under laminar flow conditions, such as
open channel wastewater applications, the TOTAL system lag
time should always be kept as short as possible (less than 5
minutes) when the system is operating at average (50 %) water
flow. Keep in mind that the lag time will increase as the water
flow decreases and vice versa.
The total system lag time is generally the sum of three individual
times (T1, T2, and T3) as illustrated in drawing Nos. 2, 3, 4,
and 5. T1 and T3 are FIXED lag times and T2 can be either
FIXED OR VARIABLE.
1) T1 is the time it takes for the chemical solution to travel
from the throat of the ejector to the point of application.
Keep this time as short as possible by installing the ejector
close to the application point.
2) T2 is the time it takes for the chemical solution to mix
with the water and travel to the sampling point of the
analyzer. This time will vary ONLY if the water flow varies.
3) T3 is the time it takes for the water sample to travel from
the point it is drawn to the sampling cell of the analyzer.
This time should be kept as short as possible by
installing the analyzer close to the sample point.
NOTE:
AN EFFECTIVE WAY OF MEASURING THE
SYSTEM LAG TIME IS EXPLAINED LATER IN THIS
BULLETIN UNDER SYSTEM STARTUP (SECTION 7.0).
C) THE IMPORTANCE OF PROPER SIZING
OF SYSTEM COMPONENTS
Use the following guideline to properly size the system components.
1) The REGAL Gas Feed System should be sized so the
average gas feed rate falls within the middle third of the
system’s capacity (maximum feed rate).
2) The Residual Analyzer should be sized so the established
set point falls as close as possible to the midpoint (12mA)
of a 4-20mA analog signal range. e.g. - If the residual
set point is 1.00 PPM, the best size analyzer would
have a range of 0 (4mA) to 2.00 (20mA) PPM.
3) The water flow meter and transmitter must be sized, or
scaled, so the maximum water flow coincides with the
m
aximum feed rate (capacity) of the SMARTVALVE.
D) TRANSIENT VOLTAGE SURGE SUPPRESSION
(See Drawing No. 9)
In order for automatic control systems to operate properly, the
individual components must have “clean” signals that are free
of accumulated transients and protected against electrical
p
ower surges. Electrical surges travel along AC lines, data
lines, analog signal lines, communication lines, and virtually
any conductor they can find. A powerful surge can totally
destroy solid state circuits and their components. Therefore, it
is essential to install external power conditioning equipment
such as surge suppressors and filters. REGAL SMARTVALVES
should be protected with suppression devices placed on the
incoming AC power line and on the incoming DC analog signal
lines. The analog signal lines for flow inputs and residual
analyzer inputs should provide a voltage clamp at a maximum
of 12 volts.
The REGAL Models 7009 and 7010 SMARTVALVES are just
one component in a REGAL complete gas feed system.
Therefore, it is essential for all other system components to be
in proper operating condition prior to installation. If the REGAL
SMARTVALVE is being added to an existing gas feed system,
some changes to system components may be required to
ensure proper function. Refer to the Instruction Bulletin provided
with your REGAL gas feed system for more information. Also
feel free to contact your local REGAL dealer or Chlorinators
Incorporated directly.
IMPORTANT:
When shipped from the factory, the REGAL
Model 7009 or 7010 SMARTVALVE will be sized to
the capacity specified by the customer at the time of
purchase. If the capacity needs to be changed for any
reason, the Valve Plug size, Remote Meter Panel, and
other system components may also need to be changed.
Consult your REGAL dealer or Chlorinators Incorporated
for further assistance.
NOTE: It is highly recommended to use exclusively REGAL
components to ensure proper, consistent function of
the system.
A) LOCATION OF COMPONENTS
(See Drawing Nos. 1, 2, 3, 4, and 5)
The REGAL SMARTVALVE should be wall mounted at eye
level in an area where it is easily accessible and provides a
clear view for easy operation. For optimal performance, the
installation should be indoors so that temperature limitations
are not exceeded. SEE SPECIFICATIONS.
IMPORTANT:
Make sure the enclosure cover is in place
and securely fastened to prevent the entry of moisture or
corrosive gases while also eliminating the possibility of
electric shock.
7
3.0 INSTALLATION
To Next Page
Loading...