TPI 721 Manual de usuario
721
Combustible Gas Leak
Detector Instruction Manual
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TABLE OF CONTENTS
A. INTRODUCTION
1. Congratulations ..........................3
2. Product Description....................3
B. SAFETY CONSIDERATIONS ..............4
C. TECHNICAL DATA
1. Features and Benefits..................5
2. Product Applications ..................5
3. Specifications..............................6
D. MEASUREMENT TECHNIQUES
1. Controls and Functions ..............7
2. Step by Step Procedures: ..........9
E. ADDITIONAL FEATURES..................12
F. TROUBLE SHOOTING GUIDE ..........15
H. MAINTENANCE ................................15
I. ACCESSORIES ................................15
2
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A. INTRODUCTION
1. Congratulations!!
Thank you for purchasing TPI products. The 721 is easy
to use and is built to last. It is backed by a 3 year limit-
ed warranty. Please remember to complete and return
your product warranty registration card.
2. Product Description
The ergonomically designed 721 is a hand-held, com-
bustible gas leak detector. It is capable of finding com-
bustible gas leaks in pipes, fittings, regulators, etc.
Additional features include the capability to display
%LEL, leak level in ppm, and user adjustable alarm
point.
The 721 comes complete with the following accessories:
Carrying Pouch (A780)
Instruction Manual
Battery & Sensor (Installed & Calibrated)
3
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B. SAFETY CONSIDERATIONS
WARNING: Please follow manufacturers test
procedures whenever possible. Do not place the
sensor cage located on the end of the gooseneck on
hot or in hot locations.
GENERAL GUIDELINES
ALWAYS
• Turn your detector on in a “clean air” environment away
from the test location.
•Inspect the sensor cage to ensure it is securely attached.
NEVER
•Place the detector or sensor cage in or on a hot item.
4
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C. TECHNICAL DATA
1. Features and Benefits
Auto Zero Automatically sets the sensor to
zero at start up.
%LEL Displays the percentage lower explosive
limit (LEL)
PPM Displays the amount of leakage in
parts per million (ppm)
Mute Mutes the speaker and earphone alarm
Zero Manually sets the sensor to zero
Adjustable Alarm point can be set as required
Alarm
Visual Alarm LED’s located on the front and
Alarm in the sensor cage tip
Auto Off When enabled, the 721 turns off after
approximately 20 minutes to saves battery
life. Can be disabled.
2. Product Applications
Perform the following tests and/or measurements with the 721
leak detector:
• Locate combustible gas leaks in joints and fittings.
• Determine Lower Explosive Limit percentage.
• Determine the combustible gas leak level in ppm (parts per
million).
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3. Specifications
Leak Detection Sensitivity (methane): 10ppm
Gases Detected (partial listing): Acetone, Acetylene, Alcohol,
Ammonia, Benzene, Butane, Ethanol, Ethylene Oxide, Gasoline,
Hexane, Hydrogen, Methane, Naphtha, Natural Gas, Paint Thinners,
Propane, Solvents
Display Type: Dual display with backlight
Display Modes: Real (ppm), Leak Level (stepped ppm), %LEL
Ranges: Real ppm: 0 to 9999ppm
Stepped ppm: 0, 500, 1000, 3000, 5000, 9999ppm
%LEL: 0 to 19.9%
Accuracy: +/-10%
Audible Leak Indication: Adjustable tic rate via side thumb wheel
Alarm Indication: Visual and audible (User adjustable alarm level)
Sensor Test and Zero: Automatic at start up
Goose Neck: 16” long with visual alarm indicator in sensor housing
Operating Temperature: 32 to 122 (0 to 50)
Gooseneck Length: 16 inches
Battery Type: “C” size Alkaline (2)
Size: 9.4” x 2.9” x 2.2” (240mm x 74mm x 55mm)
Weight: 1 lb (454g)
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D. MEASUREMENT TECHNIQUES
1. Controls and Functions:
Push Buttons
Short Press: Turns the 721 on.
Long Press (3 seconds): Turns
the 721 off.
Short Press: Silences the alarm.
Long Press (3 seconds): Activates
Menu Mode.
Short Press: Activates sensor
zero.
Long Press (3 seconds): Turns
the backlight on and off.
Thumb Controls speed of tick rate
Wheel
7
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D. MEASUREMENT TECHNIQUES
1. Controls and Functions (continued):
Instrument Layout
Keypad
Gooseneck
Display
Sensor cage containing
the sensor and visual
alarm indicator
Speaker
Alarm LED
On Indicator
Tick adjust wheel
Earphone
Jack
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D. MEASUREMENT TECHNIQUES
2. Step by Step Procedures:
WARNING!
Turn the 721 in a “clean air” environment away from the
test area. Failure to do so may cause the 721 to display
sensor error and turn off.
Measurement Procedure:
1. Turn the 721 on by pressing the key. The 721 will begin
a 30 second countdown and “wait” will display. During this
countdown the sensor is being self tested and set to zero.
2. After the countdown is complete the 721 will display “0” and a
tic rate will begin.
3. At this point the display mode can be selected. Once the dis-
play mode is selected the 721 will turn on in the same mode
each time unless changed. If the display mode does not need
to be changed, proceed to step 8.
4. To change the display mode press and hold the key for
approximately 3 seconds to enter menu mode. The following
will be displayed:
5. Press the key to proceed to the display mode screen.
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Step by Step Procedures (continued):
6. Depending on the last display mode selected one of the
following displays will be seen. The display modes can be
changed by using the key to cycle between them.
“REAL” mode will display leak levels in ppm (parts per million)
“LEL %” will display leak levels in %LEL (Lower Explosive Limit)
“0ppm ud (ud=under)” will display leaks in steps. The steps are
0ppm, ud 500ppm, ud 1000ppm, ud 3000ppm, ud 5000ppm, ud
9999ppm
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