Graco Fluid Defender 25V475 User manual

3A7279B
EN
Instructions
Fluid Defender™
Level Sensor
For monitoring lubrication fluid tank levels in above ground, stationary tanks. Not for use
with tanks containing gasoline or any other Class I NFPA 30 flammable fluids. Not for use
with tanks without required overfill containment protection, not a replacement for overfill
containment protection. For professional use only.
Not approved for use in explosive atmospheres or hazardous (classified) locations.
Models:
25V475 - Sensor, Single, High Level, 3 ft
25V476 - Sensor, Single, Low Level, 10 ft
25V577 - Sensor, Single, Low Level, 30 ft
25V478 - Sensor, Dual Level, 10 ft
25V479 - Sensor, Dual Level, 30 ft
Related Manuals
Important Safety Instructions
Read all warnings and instructions in this
manual before using the equipment.
Save these instructions.
Manual in
English Description
130641 Pulse® Fluid Management, Register Your
Devices quick guide
3A9335 Fluid Defender
3A7280 Air Control Solenoid Valve for Fluid
Defender

Warnings
2 3A7279B
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The
exclamation point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks.
When these symbols appear in the body of this manual or on warning labels, refer back to these Warnings.
Product-specific hazard symbols and warnings not covered in this section may appear throughout the body of this
manual where applicable.
WARNING
FIRE AND EXPLOSION HAZARD
When flammable fluids are present in the work area, such as gasoline and windshield wiper fluid, be
aware that flammable fumes can ignite or explode. To help prevent fire and explosion:
• Use equipment only in well-ventilated area.
• Eliminate all ignition sources, such as cigarettes and portable electric lamps.
• Ground all equipment in the work area.
• Keep work area free of debris, including rags and spilled or open containers of solvent and gasoline.
• Do not plug or unplug power cords or turn lights on or off when flammable fumes are present.
• Use only grounded hoses.
•Stop operation immediately if static sparking occurs or you feel a shock. Do not use equipment
until you identify and correct the problem.
• Keep a working fire extinguisher in the work area.
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system
component. See Technical Specifications in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical
Specifications in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For
complete information about your material, request Safety Data Sheets (SDSs) from distributor or
retailer.
• Turn off all equipment and follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
manufacturer’s replacement parts only.
• Do not alter or modify equipment. Alterations or modifications may void agency approvals and
create safety hazards.
• Make sure all equipment is rated and approved for the environment in which you are using it.
• Use equipment only for its intended purpose. Call your 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.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
PERSONAL PROTECTIVE EQUIPMENT
Wear appropriate protective equipment when in the work area to help prevent serious injury, including
eye injury, hearing loss, inhalation of toxic fumes, and burns. Protective equipment includes but is not
limited to:
• Protective eyewear, and hearing protection.
• Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufacturer.

Typical Installation
3A7279B 3
Typical Installation
There are multiple system configurations possible. The typical installations shown in FIG. 1 - FIG. 3 are the three
targeted applications for the Fluid Defender. Each typical installation shown is configurable as a single separate
channel. Follow all local codes and regulations for tank installations. Consult your local Graco representative or
distributor for system design assistance.
Waste Oil High Level Shut Off
FIG. 1

Typical Installation
4 3A7279B
Fresh Oil Low Level
FIG. 2

Typical Installation
3A7279B 5
Remote Bulk Fill Stop
FIG. 3

Overview
6 3A7279B
Overview
Fluid Level Sensors
The fluid level sensors detect the tank fluid level and
signals the Fluid Defender to activate the alarm and
deactivate the air control solenoid valve (if configured
on the specific channel).
Control level sensor: A level sensor connected as a
control level sensor to the Fluid Defender that controls
the output of an air control solenoid valve. Either a high
level or low level sensor may be connected as a control
level sensor
Monitor level sensor: A level sensor connected to the
Fluid Defender as a monitor level sensor that monitors a
tank fluid level. Either a high level or a low level sensor
may be connected as a monitor level sensor.
NOTE: Level sensors are preconfigured at the factory.
Do not attempt to reconfigure a level sensor by
changing the float orientation. High level sensors are
unable to be configured into low level sensors, and low
level sensors are unable to be configured into high level
sensors.
High Level Sensors
A sensor that is used to detect a full tank. The float is in
the down position and the sensor contacts are closed
during normal operation (FIG. 4, illustration a).
The float moves to the up position and the sensor
contacts are open during a high level condition,
triggering the Fluid Defender alarm (FIG. 4,
illustration b).
Low Level Sensors
A sensor that is used to detect an empty tank. The float
is in the up position and the sensor contacts are closed
during normal operation (FIG. 4, illustration c).
The float moves to the down position and the sensor
contacts are open during a low level condition,
triggering the Fluid Defender alarm (FIG. 4,
illustration d).
NOTE: For clarity, FIG. 4 does not show the splash
guard.
FIG. 4

Installation
3A7279B 7
Installation
Installation of Level Sensors
NOTE: Install level sensors in stationary tanks. The
sensors are not designed to monitor mobile tanks.
1. Apply thread sealant to the threads of a 2 npt bung
adapter to seal the tank.
2. Install level sensors away from inlet ports or pumps
to minimize inaccurate readings.
3. Ensure that the sensor body is free hanging from
the bung adapter housing.
NOTE: Level sensors are for vertical mounting only.
4. Set level sensor height by loosening the cord grip
on the bung adapter housing and adjust the length
of the suspended wire to set the desired activation
height.
NOTE: For guidance on calculation of installation height
of overfill devices, refer to Petroleum Equipment
Institute (PEI) RP600 Recommended Practices for
Overfill Prevention for Shop-Fabricated Above Ground
Tanks, Appendix A (www.pei.org).
a. The activation height is indicated on the splash
guard of the sensor.
b. High level sensors monitor the high tank fluid
level to prevent overfill.
NOTE: The level sensor height should be set to
activate following all local codes and regulations.
c. Low level sensors monitor the low tank fluid
level to prevent pump runaway conditions.
NOTE: The level sensor height should be set at
least 2 in. - 3 in. above the pump inlet.
d. Tighten the cord grip on the cable to finger
tight, plus one-half of a turn.
NOTE: Failure to properly tighten the cord grip may
cause the level sensor to move from the fixed
position.
5. Connect the level sensor wires following the
instructions in Fluid Defender manual, see Related
Manuals, page 1.
NOTE: Attach all accessory wires to the Fluid
Defender control box following all local codes and
regulations.
Reference the Technical Specifications, page 12,
for information on maximum wire runs and shielded
cable requirements.
All accessory circuits are low voltage (less than 48
VDC).

Operation
8 3A7279B
Operation
High Level Sensors
When the tank level is not at full, the float is in the down
position, normal condition, the contact is closed: no
alarm (FIG. 5, illustration a).
As the tank level rises and reaches the level sensor, the
float moves to the up position and opens the contacts
(FIG. 5, illustration b).
Low Level Sensors
When the tank is not empty, the float is in the up
position, normal condition, the contact is closed: no
alarm (FIG. 5, illustration c).
As the tank level falls and reaches the level sensor, the
float moves to the down position and opens the
contacts (FIG. 5, illustration d).
NOTE: For clarity, FIG. 5 does not show the splash
guard.
FIG. 5

Maintenance
3A7279B 9
Maintenance
Periodic Testing
Weekly (and before every remote bulk fill)
1. Press and hold the RESET button to test the siren,
rotating beacon, remote lights, and Fluid Defender
alarm lights.
2. Press the RESET button to reset the alarm.
Monthly
1. Relieve pressure following the pressure relief
instructions in your pump manual.
2. Remove the level sensors from the tanks and
manually raise or lower the float to verify that the
system goes into alarm mode.
3. Inspect the level sensors and remove magnetic
particles from fluid contamination that may interfere
with operation.
4. Manually test all of the accessories to verify they
are functioning properly.
5. Confirm that all wires are properly connected to the
Fluid Defender and accessories.
Recycling and Disposal
End of Product Life
At the end of a product’s useful life, recycle it in a
responsible manner.
Troubleshooting
Follow the pressure relief instructions in your pump
manual, before checking or repairing the system.
See Fluid Defender manual, Related Manuals, page 1
for Troubleshooting information.
AUTOMATIC SYSTEM ACTIVATION HAZARD
Unexpected activation of the air control solenoid
valves could result in serious injury from connected
equipment. The Fluid Defender manages the
connected air control solenoid valves that open the
air supply to connected equipment when the Fluid
Defender is powered,
Before installing, testing, or removing the Fluid
Defender, or any of its components, relieve pressure
following the pressure relief instructions in your
pump manual.
NOTICE
Disable the Fluid Defender or immediately replace
failed equipment upon any and all test failures.
Equipment failures will not allow the Fluid Defender to
monitor tank conditions and may result in a tank
overfill.

Kit
10 3A7279B
Kit
Part No. 25V592
FIG. 6
Ref. Description
1 Float
2 Retaining clip
3 Splash guard
4 O-ring

Dimensions
3A7279B 11
Dimensions
FIG. 7

Technical Specifications
12 3A7279B
Technical Specifications
Fluid Defender Level Sensor
US Metric
Type Single/Dual Point Magnetic Level Sensor/Reed Switch
High Level Normally closed - open on the rise
Low Level Normally closed - open on the fall
Mounting Configuration Vertical static applications (not designed for mobile applications)
Mounting 2 npt 2 npt
Minimum Head Space 5.5 in. 14.0 cm
Minimum Detectable Tank Level 2.0 in. 5.1 cm
Operational Tank Height Adjustable - 10 ft (3.0 m) and 30 ft (9.1 m) tank height options
Maximum Fluid Viscosity 2000 centipoise
Minimum Specific Gravity 0.75
Maximum Voltage 24 VDC
Maximum Current 0.01 A
Termination Style SJOOW Wire Leads (18 gauge)
Maximum Line Length (18 gauge) to Fluid
Defender*
1000 ft 304.8 m
Maximum Line Length (20 gauge) to Fluid
Defender*
600 ft 182.9 m
Maximum Line Length (22 gauge) to Fluid
Defender*
375 ft 114.3 m
Maximum Line Length (24 gauge) to Fluid
Defender*
230 ft 70.1 m
Temperature Range 14°F to 122°F -10°C to 50°C
Storage Temperature Range -40°F to 185°F -40°C to 85°C
Ingress Protection IP65
Wetted Components Brass, Polyamide (Nylon), Fluoroelastomer, Chlorinated
Polyethylene, Chloroprene Rubber, Berylium Copper
*Shielded cable is required for runs over 100 ft (30.5 m)

California Proposition 65
3A7279B 13
California Proposition 65
CALIFORNIA RESIDENTS
WARNING: Cancer and reproductive harm – www.P65warnings.ca.gov.

All written and visual data contained in this document reflects the latest product information available at the time of publication.
Graco reserves the right to make changes at any time without notice.
Original instructions. This manual contains English. MM 3A7279
Graco Headquarters: Minneapolis
International Offices: Belgium, China, Japan, Korea
GRACO INC. AND SUBSIDIARIES • P.O. BOX 1441 • MINNEAPOLIS MN 55440-1441 • USA
Copyright 2023, Graco Inc. All Graco manufacturing locations are registered to ISO 9001.
www.graco.com
Revision B, August 2023
Graco Standard Warranty
Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from defects in
material and workmanship on the date of sale to the original purchaser for use. With the exception of any special, extended, or limited warranty
published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by
Graco to be defective. This warranty applies only when the equipment is installed, operated and maintained in accordance with Graco’s written
recommendations.
This warranty does not cover, and Graco shall not be liable for general wear and tear, or any malfunction, damage or wear caused by faulty
installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or substitution of
non-Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of Graco equipment with
structures, accessories, equipment or materials not supplied by Graco, or the improper design, manufacture, installation, operation or
maintenance of structures, accessories, equipment or materials not supplied by Graco.
This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for verification
of the claimed defect. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The equipment will be
returned to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect in material or
workmanship, repairs will be made at a reasonable charge, which charges may include the costs of parts, labor, and transportation.
THIS WARRANTY IS EXCLUSIVE, AND IS IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
Graco’s sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above. The buyer agrees that no other remedy
(including, but not limited to, incidental or consequential damages for lost profits, lost sales, injury to person or property, or any other incidental
or consequential loss) shall be available. Any action for breach of warranty must be brought within two (2) years of the date of sale.
GRACO MAKES NO WARRANTY, AND DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, IN CONNECTION WITH ACCESSORIES, EQUIPMENT, MATERIALS OR COMPONENTS SOLD BUT NOT
MANUFACTURED BY GRACO. These items sold, but not manufactured by Graco (such as electric motors, switches, hose, etc.), are subject to
the warranty, if any, of their manufacturer. Graco will provide purchaser with reasonable assistance in making any claim for breach of these
warranties.
In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment hereunder,
or the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract, breach of warranty, the
negligence of Graco, or otherwise.
FOR GRACO CANADA CUSTOMERS
The Parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings entered
into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties reconnaissent avoir convenu
que la rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires exécutés, donnés ou intentés,
à la suite de ou en rapport, directement ou indirectement, avec les procédures concernées.
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For patent information, see www.graco.com/patents.
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Phone: [phone] or Toll Free: 1-800-533-9655, Fax: [phone]