Seametrics PT35 - Manual (Page 3)

If the meter pulses once every gallon, set the
accumulator for the number of gallons desired
between timer cycles. For meters with multiple pulses
per gallon, multiply the desired number of gallons
by the pulses per gallon. For meters with multiple
gallons between pulses, divide the desired gallons by the
gallons per pulse.
Example:
The goal is one timer output every 60 gallons.
The meter has a 5 gallons per pulse (G/P) output.
60 gallons
5 gallons/pulse
How To Determine TIMER (Power On Time) Setting(s).
The TIMER time is set to release the desired amount
of chemical to be fed or water to be bled, and is
specific to the pump, valve, etc. being used. When deter-
mining the power on time, check that it isn’t more than
the expected time between cycles, to avoid feeding and
bleeding out of order or possible overlap conditions, by
calculating:
If this result is greater than the determined power on
time, enter the determined power on time into the TIMER
setting.
INSTALLATION and OPERATION
INSTALLATION
Setting. Using the thumb screws, remove the front cover.
Test for TImer Output. To test the timed output(s), press the
“TEST 1” or “TEST 2” button. The red output indicator should
light and remain on for the pre-set number of seconds.
How To Determine Accumulator Setting(s):
OPERATION
Press the SET button. The green ACC (accumulator) light
at the upper left corner of the display will begin blinking,
indicating that the accumulator is ready to be set.
Turn the knob clockwise to increase or counter-
clockwise to decrease until the desired number of
pulses is reached.
Press SET again. The red TIMER indicator will light.
Set the desired time in seconds for output power to
turn on.
Repeat the process to set Accumulator 2 and Timer 2
as needed.
Press SET again to display "SEq" (sequential).
Turn the knob in either direction to switch from "SEq" to
"nSEq" (non-sequential). Sequential operation prevents
the Timer 2 output from operating while Timer 1 is on,
so that chemical feed does not occur during bleed.
Non-sequential operation allows either timer to operate
immediately when its count is reached.
Press SET again to return to normal operation.
1)
2)
3)
4)
5)
6)
7)
8)
= 12 pulses (accumulator setting)
After setting (when the unit has returned to normal operation,
indicated by no blinking indicators), any display can be selected
at any time by turning the knob. Turning the knob clockwise
causes clockwise rotation among the indicator lights. Stop
turning the knob after arriving at the desired display. This is the
display that will remain until another display is selected.
Possible Overlap Conditions. If the power on time is longer
than the time between on cycles, the on time won’t elapse
before the next on cycle is supposed to start. If this happens,
the power output will remain on, and “OUF” (Overlap, Under
wait time, Failure) will appear on the screen, to alert the user
that a problem has occured. This situation can be avoided by
following the equation above in “How To Determine TIMER
(Power On Time) Setting(s)”. Also note that if in sequential
mode, the sum of the on time, must be less than the minimum
seconds between cycles. Otherwise, one relay will hold up the
other and an overlap condition will occur.
Accumulator Function. The accumulator adds received
pulses once every second, and when the accumulator number
is reached or exceded, the power will turn on. However, any
pulses above the accumulator number will not roll over to the
next cycle, so if the accumulator is set to 20, with 19 pulses
already having been received, and 2 more are received in the
next second, the accumulator will read 0 once the power is
turned on, and not 1.
Cycle Size (Gallons) 60 sec minimum seconds
Max. Flow Rate (GPM) Min. between cycles
X =