Seametrics PT35 - Manual (Page 2)

2
3 1
INPUT CONNECTOR
1 POWER GND
2 INPUT SIGNAL
3 POWER OUTPUT +12VDC
TO CONNECTOR PIN 1
TO CONNECTOR PIN 1
TO CONNECTOR PIN 2
TO CONNECTOR PIN 2
TO CONNECTOR PIN 3
BLACK
WHITE
RED
ME, IP, WT FLOW METER
MR METER (or other dry contact)
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Installation
Mounting. Use a secure surface which will accept
screws. To gain access to the mounting screw holes,
remove the front clear cover by use of the thumb screws.
Mounting holes are at the four corners, under the cover.
Using the box as a template, mark the centers of the
holes with a pencil and drill. Insert screws through the
four corner holes and tighten.
Terminal Access. It is not normally necessary to ac-
cess the terminals, since the units come pre-wired for
external pigtail connection. However, terminals are pro-
vided internally for conduit connection. To reach these
terminals, remove the metal front plate after loosening
the four screws which hold it on. Terminals are behind
the plate.
Connect the Meter. Standard units provide a meter con-
nector. The mating half of this "SeaMetrics connector"
can be ordered pre-installed on any SeaMetrics meter
or flow sensor, or a cable with connector can be ordered
as a separate item, part no. 12050. If no connector is
immediately available, any wire ends can be connected
using the terminals inside (see "Terminal Access",
above).
Connect the Load. On standard units, a short pigtail
cord with receptacle is provided for connection of a 115
VAC load. The unit can be hard-wired if necessary, us-
ing the terminals inside.
Connect Power. A power cord is provided. connect by
plugging in to any standard grounded outlet. (See "Con-
nections Diagram" for conduit connection.)
Setting
Using the thumb screws, remove the front cover. 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 is reached. Then press
SET again. The red TIMER indicator will light. Set the
desired time. For a PT 35, repeat the process to set ac-
cumulator 2 and timer 2. Press SET again to get the dis-
play "SEq" (sequential). Turning the knob in either direc-
tion will 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.
One more press of the SET button returns the unit to
normal operation.
Pin Numbers for Connector - Field Installation
How To Determine Accumulator Setting(s):
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 = 12 (accumulator setting)
How To Determine Timer Setting(s).
The timer setting is based on the desired amount of
chemical to be fed or water to be bled, and is
specific to the pump, valve, etc. being used. When
calculating the time be sure it isn’t more than the
expected time between cycles, to avoid overlapping.
Check by calculating:
Cycle Size (Gallons)
Max. Flow Rate (GPM) = min. between cycles
x 60 = sec. between cycles
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