RS PRO 123-8775 User manual

ULTRASONIC
LEAKAGE DETECTOR
RS Stock No : 123-8775
Your purchase of this
ULTRASONIC LEAKAGE
DETECTOR marks a step
forward for you into the
field of precision
measurement. Although
this ULTRASONIC
LEAKAGE DETECTOR is a
complex and delicate
instrument, its durable
structure will allow many
years of use if proper
operating techniques are
developed. Please read
the following instructions
carefully and always keep
this manual within easy
reach.
OPERATION MANUAL

TABLE OF CONTENTS
1. THEORY OF ULTRASONIC LEAKAGE
DETECTION..................................................................................................................
1
2.
FEATURES.........................................................................................................................................................
2
3.
SPECIFICATIONS.................................................................................................
2
4
FRONT PANEL DESCRIPTION...........................................................................................................
3
4-1 Sensor Horn.....................................................................................................................
3
4-2 Bar LED Display Panel.....................................................................................................
3
4-3 Battery Condition Indicator..............................................................................................
3
4-4 Power Button...............................................................................................
3
4-5 Battery Test Button....................................................................................................
3
4-6 Sensitivity Setting Dial.......................................................................................................
3
4-7 Earphone Jack.................................................................................................
3
4-8 Battery Cover/Compartment.................................................................................................
3
5.
MISCELLANEOUS ACCESSORIES ............................................................................................................
4
6.
MEASURING PROCEDURE...................................................................................................................
5
7.
IMPORTANCE of the MEASURING WARNING.....................................................
6
8.
APPLICATIONS.................................................................................................................
6
9.
BATTERY REPLACEMENT.............................................................................................
7
10. MINIMUM FLOW RATE GRAPH.....................................................................................................................
8

1. THEORY OF ULTRASONIC GAS
LEAKAGE DETECTION
Human ear can hear sound frequency up to 18 KHz.
The sound frequency above 20 KHz is categorized as
ultrasonic sound which is not audible.
Ultrasonic sound is very directional in nature. We can
utilize this nature to pinpoint the exact origin of the sound
source where the leak is located.
Physics tells us that the gas always flows from the higher
pressure region to the lower one. When the pressure
difference is only a small opening, the turbulence created
by the gas through the small hole then generates ultrasonic
sound.
When any gas flows through a small opening at a rate
greater than
10
−5
atmospheric ml/sec(milliliter per
second), the gas is then generally viewed in the viscous
flow dominion. As you know, the bigger the pressure
difference across an opening, the faster the velocity. As
the velocity increase, the frequency of the emitted
ultrasonic sound will become higher too. The overall
spectra of the emitted ultrasonic sound is generally called
"white noise".
The velocity and volume of a leaking gas are affected by
the viscosity of the gas. The higher viscosity of the gas, the
velocity is slower and the volume is smaller through an
opening.
ULTRASONIC GAS LEAKAGE DETECTOR is
designed based on above simple physics.
1

2. FEATURES
This ULTRASONIC GAS LEAKAGE DETECTOR is
designed to locate the source of the ultrasonic emissions
generated by gas or air leaks. The leakage level is displayed
by "Bar LED Display Panel", and is covered to audible
sound by either internal buzzer or to external optional
earphone).
3. SPECIFICATIONS
Leakage Bar LED display panel & audible tone.
Sensitivity (Bar LED display is a relative measurement
Indicator only. Audible tone is the frequency of the
received ultrasonic sound divided by 32.)
Frequency 20 KHz to 100 KHz.
Response
Minimum Leak See Fig. 4(page 8)
Power Supply 006 P DC 9V battery
(Heavy duty, Alkaline type).
Power Approx. DC 22 mA.
Consumption
Operating 0 to 50 ℃ ( 32 to 122 ℉ ).
Temperature
Operating Max. 80% RH.
Humidity
Weight Approx. 185 g/0.41 lb (without battery).
Size HWD 255 x 85 x 35 mm
10.0 x 3.3 x 1.4 inch
2

Accessories
Operational manual............................................
1 PC
Included Rubber bottle plug with plastic
tubing....................................................................................
1 PC
1/2 inch PVC pipe...............................................
1 PC
Hard carrying case..............................................
1 PC
Accessory Earphone, model : EA-100
(Optional) Ultrasonic transmitter, model : GS-400
4. FRONT PANEL DESCRIPTION
Fig. 1
4-1 Sensor Horn
4-2 Bar LED Display Panel
4-3 Battery Condition Indicator
4-4 Power Button
4-5 Battery Test Button
4-6 Sensitivity Setting Dial
4-7 Earphone Jack
4-8 Battery Cover/Compartment
3

5. MISCELLANEOUS ACCESSORIES
(accessories included)
(1) Rubber bottle plug with plastic tubing.
This accessory can be used to extend the sensor horn,
carrying the sound from places too tight, too dangerous for
human contact, to eliminate the background noise.
Refer to fIG. 2.
Fig. 2
(2) 1/2 inch PVC pipe
The horn of the ultrasonic leak detection unit is designed
so that the pipe will fit into the horn to eliminate the
background noise & protect the operator from an area of
danger. Refer to Fig. 3.
Fig. 3
4

6. MEASURING PROCEDURE
(1) Plug in the optional earphone into the "Earphone
Jack"(4-7, Fig. 1) if so desired.
(2) Press the "Battery Test Button"(4-5, Fig. 1) to check the
battery level. The LED display panel will lit in "BAT.
OK" position if it is adequately powered, otherwise,
the battery should be replaced.
(3) Press and hold the "Power Button"(4-4, Fig. 1) during
the whole measuring period.
(4) Set the "Sensitivity Setting Dial"(4-6, Fig. 1) to the
"HIGH" position. (Note: The "Power Button" is still held
down.
(5) Approach the object under test from different angles
and to different positions. The level of the audible tone
and the level of the LED display panel will change in this
process.
(6) Try to locate a point or an aera where the audible tone is
louder and the level of the LED display panel shows the
maximum.
(Note : When the LED at the right-hand side of the
display panel is lit, it indicates the maximal reading of
detector to that specific sensitivity range setting.)
(7) Change the "Sensitivity Setting Dial"(4-6, Fig. 1) to a
lower setting. Repeat step (6).
(8) Repeat steps (6) and (7) until the leaking source is
located.
5

7. IMPORTANCE of THE MEASURING
WARNING
(1) If there is quite a bit of background noise, you may
muffle the leak detector to hear the actual leaks. This
can be accomplished with the "rubber plug with plastic
tubing" & "PVC pipe"
MISCELLANEOUS ACCESSORIES).
(2) For very noisy environments, the optional earphone
are suggested to allow the operator to hear the
converted ultrasonic sound.
(3) This detector is not intend designed to measure
the flammable gas leakage.
For safety consideration, please should not take the
detector to near the flammable gas environment.
8. APPLICATIONS
Ultrasonic Leakage Detector only
(1) Leaks in refrigeration and air condition
systems.
The leakage detector be used to detect vacuum leaks or
pressure leaks in refrigeration and air conditioning
installation. A leak will emit an ultrasonic sound as the
refrigerant escapes the unit. The detector can be used to
pinpoint the exact location of the leak by "homing" in on
this sound.
(2) Leaks in heating system.
(3) Internal leaks in steam transfers.
(4) Compressed air leaks.
(5) Tire & tube leaks.
(6) Engine seals.
6

(7) Electrical arcing.
Electrical arcing can be detected with the ultrasonic
leakage detector. Arcing produces a rich ultrasonic
spectrum that is quite noisy. Used the PVC pipe
accessory to extend the sensor horn of the dector for
safety purpose.
(8) To check the bearing problems.
(9) Bake system.
Ultrasonic Leakage Detector +
Ultrasonic transmitter(GS-400, optional)
(1) Air leaks around door & window gaskets & seals.
(2) Water leaks in roofs.
(3) Conduit & pipe identification.
(4) Door & trunk seals.
(5) Windshield leaks.
9. BATTERY REPLACEMENT
(1) Please ref to Section 6, "MEASURING
PROCEDURES", step 2.
Press and hold the "Power Button"(4-4, Fig. 1) during
battery level. The LED display panel will lit in "BAT.
OK" position if it is adequately powered, otherwise,
the battery should be replaced.
(2) Open the Battery Cover (4-8, Fig 1) at the back of
tester and remove the battery.
Replace with a 9V battery(heavy duty) and reinstate the
cover.
7

10. MINIMUM FLOW RATE GRAPH
Fig. 4
8