Graco 311200A User Manual

Instructions - Parts List

Leak Detection
System

For detecting leaks in your diaphragm pump system.

Not for use in explosive atmospheres.

Part No. 234576

120 psi (0.8 MPa, 8 bar) Maximum Air Input Pressure

Important Safety Instructions

Read all warnings and instructions in this manual.
Save these instructions.

See page 2 for Table of Contents.

311200A

Graco Inc. P.O. Box 1441 Minneapolis, MN 55440-1441

Copyright 2005, Graco Inc. is registered to I.S. EN ISO 9001

TI6850A

Contents

Warnings

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 10

Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 10

Warnings

The following general warnings are for the safe setup, use, grounding, maintenance and repair of this equipment. The
exclamation point symbols alert you to general warnings and the hazard symbols refer to procedure-specific risks.
Refer back to these warnings. Additional product-specific warnings may be found throughout the body of this manual
where applicable.

WARNING

ELECTRIC SHOCK HAZARD

Improper grounding, setup, or usage of the system can cause electric shock.

• Turn off and disconnect power at main switch before disconnecting any cables and before servicing
equipment.

• Connect only to grounded power source.

• All electrical wiring must be done by a qualified electrician and comply with all local codes and regu­lations.

• Do not expose to rain. Store indoors.

EQUIPMENT MISUSE HAZARD

Misuse can cause death or serious injury.

• Do not exceed the maximum working pressure or temperature rating of the lowest rated system
component. See Technical Data in all equipment manuals. For complete information about your
material, request MSDS from distributor or retailer.

• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipment manuals. Read fluid and solvent manufacturer’s warnings.

• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine Graco
replacement parts only.

• Do not alter or modify equipment.

• For professional use only.

• Use equipment only for its intended purpose. Call your Graco distributor for information.

• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.

• Do not kink or over bend hoses or use hoses to pull equipment.

• Comply with all applicable safety regulations.

• Keep children and animals away from work area.

• Do not operate the unit when fatigued or under the influence of drugs or alcohol.

PERSONAL PROTECTIVE EQUIPMENT

You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, inhalation of toxic
fumes, burns, and hearing loss. This equipment includes but is not limited to:

• Protective eyewear

• Clothing and respirator as recommended by the fluid and solvent manufacturer

•Gloves

• Hearing protection

2 311200A

Overview

Overview

Usage

The leak detector monitors air operated double dia­phragm pumps for diaphragm rupture or other leaks that
may contaminate the fluid being pumped. The system is
made up of a main control box and two liquid detection
sensors. The sensors are screwed into the air side of
each diaphragm on the pump. When liquid is sensed by
either one of the sensors, an alarm will sound, indicating
a diaphragm rupture has occurred. The control box also
has the ability to control an external device such as an
alarm, light, or an air solenoid via an onboard relay.

During normal operation, the LED indicators on the con­trol box and each sensor will flash once per second,
indicating proper operation. If a system fault or a leak is
detected, an alarm will sound and the LED on the con­trol box will blink three times per second. See table,
page 8.

Component Identification and
Description

Before you install the system, you should be familiar
with the parts discussed in the following paragraphs.

Sensors

The sensors are mounted on the pump to detect liquid
on the air side of the diaphragm. See F
F

IG. 5.

IG. 1, FIG. 2, and

Having both conductive and optical sensors allows the
sensor to detect as many liquids as possible. When both
sensors are in air, both lights (blue and yellow) flash
once per second.

When the sensor is immersed in a conductive liquid, the
blue LED will stop flashing. When the sensor is
immersed in a liquid compatible with the optical sensor
the yellow LED will stop flashing.

Control Box

The control box powers and monitors the sensors and
sound the alarm when a leak is detected.

The control box powers and reads the sensors every
second. If the sensors detect liquid, the control box will
alarm and set it’s fault relay.

Relay

The relay has two sets of contacts that can be used to
indicate an error by turning off a valve, lighting a light,
etc. The contacts are located at J4 on the circuit board.
See F

IG. 6.

There are two separate sets of Common, NO/NC con­tacts labeled CRS.

• C (Common)

• R is Reset, which is connected to Common during
normal operation. (NO)

The sensors use two methods of detection: optical and
conductive.

Sensors Definition

Conductive The two metal pins on the sensors.

Controls the blue light and its signal
is the white wire.

Optical The plastic dome in the center of the

sensor. Controls the yellow light and
its signal is the green wire.

311200A 3

• S is Set, which is connected to Common when an
error is detected. (NC)

For example, if an air valve was held open during normal
operation, the power to the valve would enter at C and
exit at R. During normal operation C and R are con­nected and would open if liquid were detected by a sen­sor. This would stop the pump. Power must be
maintained to the control box for the pump to operate.
When the control box loses power it will set the relay.
Both sets of CRS contacts are floating contacts and are
electrically isolated from each other and the electronics
on the control board. They do not supply power and
should be used as a switch only.