Seametrics PT35 Operating Manual

PT35

ISO

DUAL PULSE TIMER
INSTRUCTIONS

Bright LED Display
+ visible in low light

Setting Knob
+ increase clockwise
+ decrease counter-clockwise

PT35 DUAL PULSE TIMER INSTRUCTIONS

Input Indicator Light

Test Buttons
Force One
Timed Output

Easy-Off Cover

Meter Input Connector

Pre-Wired Outputs
and Power Cord

9 001:2008

CERTIFIED COMPANY

GENERAL INFORMATION

INPUT CONNECTOR

The PT35 digital counter-timer is designed to be used with

Seametrics (or similar) meters and ow sensors that produce a

pulse signal. It is typically used in water treatment and chemical
dosing applications, most often in cooling towers and boilers.
The PT35 serves as either a single or a dual timer, depending
on whether one or both of its independent accumulators and
timed outputs are used.

In single timer applications, one accumulator counts pulses
coming from the meter. When a pre-set number of pulses has
been reached, output power turns on for a set time, and then
the cycle repeats.

In dual timer applications (typically, one chemical feed and one
water bleed), both accumulators and timers are set to operate
independently with input from a single meter. A sequential
function can be selected to lock one timer out while the other
is operating. This prevents feed and bleed from occurring
simultaneously.

INSTALLATION and CONNECTION

Mounting. Use a secure surface that will accept screws.
Remove the front clear cover by use of the thumb screws to
access the mounting holes at the four corners. 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.

The PT35 can be used with dry contact meters (e.g. Seametrics
MJR meters), contacting-head meters with solid-state pickups

(e.g. Seametrics MJE meters), or insertion ow sensors (e.g.

Seametrics IP, TX, and EX Series).

SPECIFICATIONS*

Power

Sensor Power

Output (2)

Enclosure

Accumulator Range

Timer Range

Maximum Input Frequency

Relay Contact Rating

Temperature

*Specications subject to change • Please consult our website for current
data (www.seametrics.com).

PT35 Connections Diagram

115 Vac

12 Vdc

115 Vac

5” x 7” polycarbonate

1 - 9999 pulses

1 - 9999 seconds

1000 Hz

5 A resistive @ 115 Vac, or 1/4 HP

32˚ - 130˚ F (0˚ - 55˚ C)

PT35

Connect the Meter. Because the PT35 comes standard with

a built-in meter connector, the simplest method of connect­ing your Seametrics meter to the PT35 is to order a mating

“Seametrics connector” pre-installed on your meter or ow

sensor. If your meter does not have a Seametrics connector,
there are three alternatives: 1) Any wire ends can be con­nected to the PT35 terminal block (see Connections diagram
at right). 2) A cable-with-connector can be factory-ordered

and eld-wired to your meter. 3) A connector can be factory­ordered and eld-installed on your meter output cable (see

Connector Field Installation diagram below).

Connector Field Installation

3

1

2

Hall-effect or transistor switch

1POWER GND
2 INPUT SIGNAL
3POWER OUTPUT +12 Vdc

BLACK

WHITE

RED

To Connector Pin 1

To Connector Pin 2

To Connector Pin 3

POWER

Ground
Neutral

Hot

3AG-10A-SB

Fuse

H V G

Hot Normally Open

Hot Normally Closed

GND
SIGNAL

GND
SIGNAL
+12 Vdc

PUMP+
GND
SIGNAL

+12Vdc

Neutral
Ground

OUTPUT 2

NO NC N G

DRY CONTACT
TYPE METER

EXTERNALLY- PACED
METERING PUMP

OUTPUT 1

SOLID STATE
TYPE METER

SOLID STAT E
TYPE METER

NO NC N G

Ground
Neutral
Hot Normally Closed
Hot Normally Open

P
G
S
V

Input Connections

Connect the Load. Two output cords are provided for connec-

tion of 115 Vac loads. The unit can be hard-wired if necessary,
using the terminals inside.

Dry contact

To Connector Pin 1

To Connector Pin 2

Connect Power. A power cord is provided. Connect by plugging
in to any standard grounded outlet. (See Connections Diagram
above for conduit connection.)