TPI 721 Manuel utilisateur

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

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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)

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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.

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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

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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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