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Class I Leak Detection Systems Highest level of monitoring and prevention of
double walled tanks and pipes,
according EU Standard EN 13160-2
Vacuum systems
working principle…
www.thomas-leak-detection.com
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Leak Detection acc. EN 13160 Class I
Working principle - Vacuum system
Vacuum leak detector
(e.g. THOMAS-ASF IIIF)
Green operation light
Normal Operation
- Leak detector shows normal
operation by green light
- Interstitial space of the double
walled tank (or pipe) is
evacuated up to system setup
„Pump OFF“
- Normal pressure differences,
caused by the system or
temperature changes balanced
by the pump
Note:
If the starting frequency of the
pump increasing more and more,
this points to an increasing
leakage.
2
Suction
line
Measuring
line
Vacuum in the
Interstitial
Air
flow
Pump
Interstitial
space
OFF
OFF
Double
walled tank
(or pipe)
ON
ON
Leak Detection acc. EN 13160 Class I
Working principle - Vacuum system
Vacuum leak detector
(e.g. THOMAS-ASF IIIF)
Red alarm light
Leakage in the system…
 Air leakage
- Air is sucked through the inner
(or outer) wall into the interstitial
 called air leakage
- Vacuum level in the interstitial
space drops
Air
- At set point “Pump ON”, pump
flow
starts
- For a higher leakage, the pump
can‘t balance, the vacuum level
… inner
tank
changes down to the
set point
wall, above the
“Alarm ON”
liquid level
- Alarm situation indicated
by visual
red light and acoustic buzzer
- Switch off the buzzer,
call for service
Alarm buzzer switch
Buzzer disabled indicated
by yellow light
Vacuum in the
Interstitial
… in the
outer tank wall
or
Pump
OFF
OFF
ON
ON
Leak Detection acc. EN 13160 Class I
Working principle - Vacuum system
Vacuum leak detector
(e.g. THOMAS-ASF IIIF)
Leakage in the system…
 Liquid sucked into the interstitial
- Liquid is sucked through the wall
into the interstitial
- Liquid volume in the interstitial is
slowly increasing
- Vacuum level drops because of
Air
decreasing air volume
flow
Vacuum in the
Interstitial
Pump
… inner tank
wall, below the
liquid level
OFF
OFF
ON
Leak Detection acc. EN 13160 Class I
Working principle - Vacuum system
Vacuum leak detector
(e.g. THOMAS-ASF IIIF)
Leakage in the system…
 Liquid sucked into the interstitial
- Liqiud is sucked through the wall
into the interstitial
- Liquid volume in the interstitial is
slowly increasing
- Vacuum level drops because of
Air
decreasing air volume
flow
- At set point “Pump ON”, pump
starts
- The interstitial will be filled with
liquid step by step
Vacuum in the
Interstitial
Pump
OFF
OFF
ON
ON
Leak Detection acc. EN 13160 Class I
Working principle - Vacuum system
Vacuum leak detector
(e.g. THOMAS-ASF IIIF)
Leakage in the system…
 liquid barrier closes
- On the tank top, liquid is sucked
into the suction line
- Liquid barrier filled up and
closes
- Connection suction line to the
interstitial and measuring line
blocked
Air
flow
Vacuum in the
Interstitial
Pump
OFF
ON
ON
Leak Detection acc. EN 13160 Class I
Working principle - Vacuum system
Vacuum leak detector
(e.g. THOMAS-ASF IIIF)
Leakage in the system…
 Alarm indication
- Remainimg vacuum in the
measuring line will absorb liquid,
Vacuum level decreases
- At set point “Alarm ON”,
Alarm situation indicated by visual
Air
red light and acoustic buzzer
flow
- Switch off the buzzer,
call for service
- The vacuum level in the
measuring and suction line will
keep the liquid in the interstitial
space for a certain period of
time
 preventing leaking into the
environment
Red alarm light
Alarm buzzer switch
Buzzer disabled indicated
by yellow light
Vacuum in the
Interstitial
Pump
OFF
ON
ON
Focus on Safety,
For A Clean Environment.
Proven ASF
Leak Detector Technology
Contact
Mail: [email protected]
Phone: +49 (0)89 809 00 1170
Web: www.thomas-leak-detection.com
Copyright – Gardner Denver Thomas GmbH, D-82178 Puchheim, 02/2014
Thomas does not warrant, guarantee or assume any obligation or liability in connection with this information.
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