HUALIAN HVC Series User manual

Content
Preface/Instruction .....................1
1. Product Description
1.1 Product Usage..............................2
1.2 Products Features ........................2
1.3 Operation Principle.......................2
1.4 Naming of the Model.....................3
1.5 Main Components.........................4
2. Security
2.1 Preparation...................................6
2.2 Notice for Security .......................6
2.3 Operating Environment.................7
3. Carrying
3.1 Carton Packing ...........................7
3.2 Wooden Case Packing.................7
4. Installation
4.1 Prerequisite for Installation...........8
4.2 Environment for Installation..........8
4.3 Filling oil........................................9
4.4 Connecting Electric.....................10
4.5 Connecting Gas-filling System ...11
4.6 Connecting Vacuum System......12
5. Start and Operation
5.1 Control Panel..............................13
5.2 Power on.....................................15
5.3 Check the Turning Direction of the
Vacuum pump ...........................15
6. Standard Operation and
Parameter Setting
6.1 Standard Operation....................17
6.2 Instruction of Controlling Program’s
Cycle...........................................18
6.3 Parameter Setting.......................20
6.4 Optimal Parameter......................22
6.5 Packing Liquid Products.............22
6.6 Optimal Packing..........................23
7. Maintenance
7.1 Standard Maintenance Schedule24
7.2 Vacuum Pump Maintenance ......24
7.3 Special Oil for Vacuum Pump..........27
7.4 Replace Teflon cloth and Flat Heating
wire...................................................27
7.5 Replace Silicon Strip........................29
7.6 Replace Sealing Ring......................30
7.7 List of maintained components........30
8. Trouble shooting
8.1 Trouble shooting of the machine body
.........................................................31
8.2 Trouble shooting of Vacuum Pump.32
8.3 Trouble shooting of Solenoid Valve.32
8.4 Trouble shooting of the Sealing
Device..............................................33
9. Technical Parameter
9.1 Parameter of A Series.....................34
9.2 Parameter of B Series.....................34
9.3 Parameter of C Series.....................35
9.4 Parameter in Common....................36
10 Storage
10.1 Storage for short time......................36
10.2 Storage for long time.......................36
10.3 Restart after storage .......................36
11 Diagrams
11.1 Diagram of Arch Vacuum Lid ........37
11.2 Diagram of Ultra-thin Vacuum Lid .38
11.3 Diagram of Shallow Vacuum
Chamber ........................................39
11.4 Diagram of Flat Vacuum Chamber 40
11.5 Diagram of Housing ........................41
12 Electric Schematic Diagram
12.1 Electric Schematic Diagram of
Relay-controlling .............................42
12.2 Electric Schematic Diagram of
Computer Panel-controlling ............44
13 Diagram of Gas circuit.............45

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Preface
Thank you for your choice of our HVC Series Automatic Continuous Vacuum Packing
Machine. The content of this instruction is as following:
Product Description
Notice for Security
Carrying and Storage
Installation and Commissioning
Operating Guide
Maintenance and Repairing
Troubles and Solutions
This manual introduces the installation and Operation of the product, the following items are
included: Carrying, Storage, Installation, Startup, Operating condition, Maintenance, troubles and
solutions, and Repairing.
Notice:
Please read this introduction carefully and get it through before your use.
Make sure this introduction is possessed by the operator or the managerial personnel of this
product.
Please keep this manual after reading and make sure it is touchable for reference in future.
Any questions please contact the supplier.
Responsibility:
This instruction is specially edited by great care. The manufacturer is irresponsible for the
mistakes or the user’s misunderstanding.
The manufacturer is irresponsible for the damage or problems raised by having not adopted
the required spare part.
The manufacturer has the right to amend the parameter or the spare part no further notice will
be given to the buyer.
The manufacturer has the reserved rights. Don’t reprint any part of the instruction without our
written agreement.
Terms:
Teflon Cloth: PTFE Coated Fabric. It features High temperature resistance and nonstick.
Heating Block: Consist of Aluminum Profile (or Sealing bar), Sealing wire, Teflon cloth, etc.

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1. Product Description
1.1 Usage and Application
HVC series vacuum packaging machine possesses the advantages of superior function, easy
operation, simple maintenance, wide application etc. It applies to the soft packing material such as
composite film or aluminum-plastic composite film and so on. It can pack grain, food, fruit, seed,
medicine, chemical product, electronic product, precision instrument and meter, rare expensive
metal solid etc in liquid, powder or paste shape. The products after packing can be prevented from
oxidization, mildew, moth, rot and damp, so quality and freshness is guaranteed to prolong the
food’s storage period.
1.2 Product Features
The machine possesses oil-mist removing function, so it unnecessary to connect a pipe for
exhaust.
It is easy to operate this machine. The whole procedure, including lowering the synthetic glass
vacuum lid, vacumizing, gas-filling (if any), heat-sealing, label printing, cooling, air intake and
lifting the vacuum lid, is completed automatically.
The wide range of the temperature of sealing mouth can be applied to the packing bags with
different materials and thickness
There is an emergent stop switch in the control panel. If any exception in the extracting
process, press STOP can interrupt the packing procedure and return to standby state.
1.3 Operating Principle
Put the bags in the vacuum chamber and lower the vacuum lid. Startup the machine, the vacuum
pump runs and will form a vacuum space between the vacuum lid and the vacuum chamber.When
the vacuumizing finished, fill the gas to the vacuum chamber if it is needed. Then the airbag or the
cylinder will force the heating block to lift to hold down the bags in the effect of the pressure
difference inside the vacuum chamber and the outside. The flat heating wire in the heating plate
will become hot and the seal the bag when it is connected with low-voltage heavy current.
Consequently, fill the vacuum chamber with air after cooling down. The whole vacuum packing is
completed

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1.4 Naming of the Model
HV C XXX X / X X –X X X
Vacuum pump option (optional)
Blank: internally installed
E: external connected
N: no vacuum pump
Automatic lid closing (optional)
Blank: without this function
L: auto lid closing
Gas flushing(optional)
Blank: without gas flushing
G: with gas flushing
The vacuum chamber styles
A：vacuum chamber + arch lid
B：flat vacuum chamber + arch lid
C：flat vacuum chamber + thin lid
D：vacuum chamber + flat lid
Sealing Bar quantity
(1pc or 2pcs or 4pcs)
Model code
S：double chamber
T：table type
F：floor type
Sealing length(mm）
（410；510；610）
Vacuum machine with chamber
Hualian vac

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1.5 Main Components
HVC-510S/2A(-G) Double-room Vacuum Packing Machine
HVC-510S/2B(-G) Double-room Vacuum Packing Machine
2
5
7
6
4
1
3
8
2
5
6
7
4
1
3
8

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HVC-510S/2C Double-room Vacuum Packing Machine (Standard)
No
Components
Remarks
1
Handle
2
Vacuum chamber
Arch lid/ultra-thin lid
3
Connecting rod
4
Lower sealing assembly
5
Vacuum chamber
Shallow/flat chamber
6
Housing
7
Control Panel
Computer pane/Relay
8
Caster
2
5
6
4
7
1
3
8

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2. Security
2.1 Preparation
This instruction is a detailed description of the carrying, storage, installation, startup, working
condition, maintenance, troubles and repairing.
It is recommended that the machine be installed by trained professional worker.
Please do abide the maintenance instruction.
Please read carefully and understand thoroughly this instruction before the use of the
machine.
Any problem please contact the supplier.
2.2 Notice for Security
Please check the power voltage and the frequency in case of error. No matter three phases
(AC380V/50Hz) or single phase, the yellow-green wire is the protective grounding wire.
Please don’t remove.
Power cord should be placed without pressure or drag and it should be put away when it is
not used.
Don’t’ operate this machine in a corrosive or dusty environment.
Don’t replace the components at will.
Keep the machine clean and remove timely the attached dust in the vacuum chamber.
Cut off the power when the machine is not used.
Please replace the vacuum pump oil timely.
Please keep this manual well for reference.
This machine is produced as per the latest technology and security standard. There maybe
danger or damage under improper operation. Please notice the keywords “DANGEROUS”,
“WARNING”, “TAKE CARE”.
E.g.:
DANGEROUS!
Ignorance of this notice will lead to damage even fatal accidence.
WARNING!
Ignorance of this notice will lead to damage even fatal accidence.

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TAKE CARE!
Ignorance of this notice will lead to injury or property loss
2.3 Operating Environment
The design of this product is running under normal temperature indoor. If the environment is in bad
condition, such as corrosive atmosphere or temperature over 35℃or less than 5℃,please
contact the manufacturer or the supplier.
The vacuum pump oil can be separated in maximum extent during its running, but not totally
separated.
TAKE CARE! UNHEALTHY!
There is residual oil of the exhaust from the vacuum pump. Breathe this gas
for long time is not good for health. This product should be placed in a
ventilating room.
Please choose the special vacuum pump oil if this machine is used for food industry.
3. Carrying
3.1 with carton packing
If the machine is packed by carton with expanded gasket,
Remove the expanded gasket from the carton.
If the machine is packed by carton with foam material,
Remove the foam material from the carton.
3.2 with wooden case packing
If the machine is fixed by screw to the base of the case,
Unscrew the screw between the machine and the base of the case.
If the machine is fixed by locking belt,
remove the locking belt
TAKE CARE！
Don’t walk, stay or work under the lifting goods.

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Note: Please fasten the attached belt or cord to the suitable position of the machine. Pay
attention to the gravity of the machine.
Make sure the cord is safely and tightly fastened to the machine.
Hang the hanger to the tackle with safe locker.
Use crane to lift.
Note: Floor-type machine has equipped with caster and it can move in the flat ground. If the
caster has locking mechanism, please unlock the mechanism before moving.
TAKE CARE! DAMAGE TO THE MACHINE!
Lean the vacuum pump full of oil will lead much oil into the pump chamber.
The vacuum pump may be damaged if there is too much oil when the
vacuum pump startup. Don’t move the vacuum pump after it is filled with oil.
Note：Please drain the vacuum pump oil before moving the machine.
4. Installation
4.1 The Prerequisite of Installation
Good and reliable protecting ground wire. To ensure the personal safety, please connect the
protecting ground wire firmly to the PE terminal of the machine or the appointed position in the
ground sign.
The power should have a breaker controller with leakage protection function.
Take care! Damage!
If the installation prerequisite can’t be reached, the machine will be
damaged.
Take care! Injured!
Make sure the installation environment meet the basic security regulation
4.2 Installation Environment
No inflammable and explosive gases around.
Temperature: 5-30℃. If the machine will be operated in other environment, please contact the
manufacturer or the supplier.
Environment pressure: standard atmospheric pressure.

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Make sure the Power meet the requirement. (see the name plate in the machine)
Make sure the machine stands stably. Use foot plate to fix the machine after it is moved to a
suitable position. The caster should leave the ground if there is any.
Make sure the machine is laid in a horizontal position, which is one of the essential of
trouble-free operation of the machine.
4.3 Filling Oil
TAKE CARE! DAMAGE!
There is no vacuum pump oil in the newly delivered machine. The vacuum
pump works without oil will damage the pump, even in a short time.
Please make sure the vacuum pump has filled with the oil before startup.
Note: The vacuum pump should be transported without oil。
TAKE CARE! DAMAGE!
Filling the oil to the vacuum pump through other position of the pump may
damage the vacuum pump. The oil should be filled through the oil filler
hole.
TAKE CARE! SCALD!
The oil tank is full with high-temperature and high-press oil mist. The user
may get scald by the hot oil mist if the oil filler hole is open. Only when
the oil filler plug is unscrewed can the vacuum pump stop running. Please
screw the oil filler plug when the vacuum pump is working.
Unload the back cover.
Unscrew the oil filler plug with wrench in right size.
Fill the machine with appropriate special oil for vacuum pump. Please refer to the Chapter 7.3
Special Oil for Vacuum Pump.
Make sure the oil level is between 1/2 and 3/4 of the oil level indicator.
Make sure the sealing ring is installed in the oil filler plug. Replace the ring when needed.
Screw the oil filler plug.
Wait for several minutes.
Check whether the oil level is between 1/2 and 3/4 of the oil level indicator. If it is less than 1/2,
please add more.
If the oil level is between 1/2 and 3/4 of the oil level indicator, fix the back cover.

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4.4 Connecting electric
DANGEROUS! ELECTRIC SHOCK!
Please make sure all the plugs have protective ground wire.
TAKE CARE! Unmatched power will damage the machine. Please check
the power parameter of the power referring to the label on the machine.
Please abide the regulation of safe operation and the national protective
measure of accident.
Power/Grounded connection
Check whether the power voltage is in accordance with the one written in the label of the
machine.
Please exam the turning direction of the vacuum pump when the machine is connected to
three phases power.
Make sure the machine is connected correctly to the grounded plug to avoid fire or electric
shock. (The grounded wire is yellowish green.
The cable should be movable to avoid extrusion.
Please replace the cable if it is damaged.
Please cut off the power when the machine is in problem or maintenance.
Please put the cable away if the machine will be left unused.
If the machine employs single-phase plug:
Connect the power cord and the machine correctly.
Connect the other side of the power cord to the wall power socket.
If the machine employs three-phase power:
Connect the power cord accurately.
Connect protective ground wire.
TAKE CARE! DAMAGE!
The incorrect turning direction of the vacuum pump motor will damage
the vacuum pump in even a short time. Please make sure the turning
direction id correct before startup.
For the vacuum pump equipped with three-phase motor:
Check the turning direction of the vacuum pump according to the instructive mark.
Turn on the power and lower the vacuum lid slightly to make the vacuum pump running (Refer
to the Start Chapter).

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Observe the fan of the vacuum pump motor if possible and determine the turning direction
before the fan stops.
If it is impossible to observe the turning direction, please listen to the sound of the motor. The
vacuum pump running in reverse direction will beep. Look at the vacuum gauge as the
vacuum pump in reverse direction can’t produce vacuum.
If it is necessary to change the turning direction:
Exchange any two phases of the three-phases power.
4.5 Connecting Gas-filling System (if any)
WARNING! EXPLOSION!
Do not use flammable gas or the combined gas with more
than 20% oxygen constitute, or the explosion may occur.
TAKE CARE! DAMAGE!
The pressure of the air supply should not be higher than
0.1Mpa, or the machine will be damaged.
Do not use flammable gas or the combined gas with high Oxygen constitute, or the explosion
may occur. The manufacturer is irresponsible for the accident or
damage caused by the violation of this rule.
The gas tank should be closed correctly. Please close the master
switch of the gas tank when no gas-filling or when the machine is
unused.
The value of the pressure valve in the gas tank should be not higher
than 0.1Mpa, or the machine may be damaged.
The diameter of screw ends in the gas-filling tube is 10mm. The
screw ends locate in the side or the back of the machine.
If any question about the gas tank please contact the supplier of the
gas tank.
Note: The sealing may complete abnormally if the sealing begins when the vacuum degree
is over 0.06MPa because of overfilling.

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4.6 Connecting Vacuum System (suitable for external vacuum pump)
If you purchase the machine with built-in vacuum pump, it is unnecessary to follow this step. If you
purchase the machine with external vacuum pump, please connect correctly the external vacuum
pump.
No
Components
Specification
1
External vacuum pump connector
Φ32mm
1

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5. Start and Operation
5.1 Control Panel
Control Panel for Relay-controlling
Panel of HVC series (without gas-filling function)
No
Name
Instruction
A
Power indicator
Show the state of power. The indicator will light when
the machine get electricity.
B
Vacuum time
Relay
Set the vacuummizing time, range from 0 to 60s.
C
Sealing time
Relay
Set the sealing time, range from 0 to 6s.
D
Cooling time
Relay
Set the cooling time, range from 0 to 6s.
E
Vacuum gauge
Show the vacuum degree of the vacuum chamber.
F
Power switch
Turn on/off the power.
G
Emergent stop switch
For emergent stop, the machine stops when the button
is pressed.
H
Heat-sealing voltage
Option switch
Option switch for heat-sealing voltage, separately high
and low two options.
Panel of HVC series (with gas-filling function)
No
Name
Instruction
A
Power indicator
Show the state of power. The indicator will light when the
machine get electricity.
B
Vacuum time
Relay
Set the vacuummizing time, range from 0 to 60s.
C
Sealing time
Relay
Set the sealing time, range from 0 to 6s.
D
Gas-filling time
Relay
Set the gas-filling time, range from 0 to 6s.
E
Vacuum gauge
Show the vacuum degree of the vacuum chamber.
F
Power switch
Turn on/off the power.
B
C
D
F
G
H
A
E

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G
Emergent stop switch
For emergent stop, the machine stops when the button is
pressed.
H
Heat-sealing voltage
Option switch
Option switch for heat-sealing voltage, separately high
and low two options.
Note：The cooling time relay of HVC series (with gas-filling function) is installed inside the
electric box of the machine.
No.
Figure
Name
Remarks
A
Monitor
Shows the state of the functions during the working and
the numbers will diminish.
Shows numbers of the parameter value of the selected
function.
Shows “_ _”for standby state.
Shows “□□”when in air-releasing state.
Shows “E d”when the program is finished.
B
Emergent
Stop
It is used to end the program. The emergent switch can
be pressed in any time to stop running. The machine
will stop all the working when this button is pressed,
Skipping to the deflating function and the vacuum lid will
open automatically.
C
Function
Select
It is used to choose a function, like vacuumizing,
gas-filling, sealing and cooling, or to change the relative
parameter. When one function is selected, the indicator
on the left side will light.
D
Up
adjustment
The parameter of the selected function will increase by
one unit every time this button is pressed.
E
Down
adjustment
The parameter of the selected function will decrease by
one unit every time this button is pressed. Press this
button and not loose, the value will decrease by about 5
units.
B
C
D
E
F
A
J
I
H
G
K

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F
Temperature
select
It is used to choose the temperature. The indicator on
the right side of the monitor will flicker (high,
Intermediate, low) as indication every time the button is
pressed. (Note: If these three indicators don’t light, the
sealing can’t be acted.)
G
Working
indicator
The indicator lights (red) during the working period.
H
Function
indicator
The corresponding indicator will light when one function
is executed during the working period.
When the Function Select button choose one function,
the corresponding indicator will light (red).
I
Temperature
indicator
When the sealing function is executed, the
corresponding indicator will light (green) during the
working period. When Temperature Select button
choose one temperature, the corresponding indicator
will light (red).
J
Vacuum
gauge
Shows the pressure value in the vacuum chamber.
K
Power
switch
Turn on/off the power.
5.2 Power on
DANGEROUS! ELECTRONIC SHOCK!
Please obey the safe operation rules.
Start the machine by turning or pressing the Power Switch.
After the power is turn on, the indicator of the machine with relay-controlling panel will light,
the monitor of the machine with computer panel-controlling shows “_ _”, which indicates the
machine is in the standby state and it can be used.
5.3 Check the turning direction of the motor
(For the vacuum pump equipped with three-phase motor)
TAKE CARE! DAMAGE!

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The incorrect turning direction of the vacuum pump motor will damage
the vacuum pump in even a short time. Please make sure the turning
direction id correct before startup.
For the machine adopting three phases power, there is a built-in vacuum pump or a power
connector for connecting vacuum pump. The vacuum pump may be damaged if the turning
direction of the vacuum pump is incorrect. Please make sure the turning direction is in the right
way.
Check the turning direction of the vacuum pump according to the instructive mark.
Turn on the power and lower the vacuum lid slightly to make the vacuum pump running (Refer
to the Start Chapter).
Observe the fan of the vacuum pump motor if possible and determine the turning direction
before the fan stops.
If it is impossible to observe the turning direction, please listen to the sound of the motor. The
vacuum pump running in reverse direction will beep. Look at the vacuum gauge as the
vacuum pump in reverse direction can’t produce vacuum.
If it is necessary to change the turning direction:
Exchange any two phases of the three-phases power.

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6. Standard Operation and Parameter Setting
TAKE CARE! INJURED!
Please operate according to this manual.
Don’t remove the necessary guard cover or housing.
TAKE CARE! UNHEALTHY!
There is resin exist in the exhaust from the vacuum pump. Breathe the
gas for long time is unhealthy. The machine should be used in a
ventilating room.
TAKE CARE! SCALD!
The heating block can reach to the high temperature of more than 200℃
when it is heating. Even after cooling, it is still in a high temperature.
Don’t pack the goods that may be damaged when vacuumizing or after vacuumization with
this machine.
If you have any question about the operation and the function that haven’t offered in this
manual, please contact the manufacturer or the supplier.
If the machine is running irregularly or make strange noise, please turn off the power
immediately, stop the running and finally cut off the power.
Once there is any problem, please contact the manufacturer or the supplier.
6.1 Standard Operation Procedure
Turn on the power switch to startup and the screen shows “_ _”.
Please employ the compound bag suitable for vacuum packing and the bags should be
sterilized before packing foods.
Put the products in the bags. Choose the proper bags for the products. Don’t choose the
oversize bags. Ensure a clean environment during the operation. The packing materials and
the hands are better to be dry.
Place the bag in the vacuum chamber or on the base plate (if any). The bag mouth should be
placed on the heating block or the silicon strip. If the bag is lower than the heating block or the
silicon strip, please insert the base plate (if any) included of the machine, which can make the
operation simple and the cycle time short.
As to the gas-filling system, please cover the bag mouth on the gas-filling connector.

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Several bags can be placed simultaneously on the heating block or the silicon strip as long as
the heating block or the strip is longer than the bags. Bags can’t be stacked. If the machine
has more than one silicon strip, these strips can be used simultaneously.
Set correct parameter for the vacuum and sealing function. Please refer to Control Panel
section.
Close the vacuum lid and the machine can complete the whole program, including
vacuumizing, gas-filling (if any), sealing and cooling. The vacuum lid will open automatically
when the last deflating finishes.
Remove the bags from the machine after the cycle is finished.
Press Emergent Switch to stop the working if necessary, then the machine will stop running
and deflates immediately. The vacuum lid opens automatically.
Circulate as the above.
Note: The vacuum lid can’t be open automatically when there is power cut or other
accidents. The machine will execute the deflation function as soon as the electricity is
reconnected and the vacuum lid will open automatically.
Note: If the machine stands in high altitude, the atmospheric pressure will decrease and the
value in the vacuum pressure gauge will reduce accordingly.
6.2 Program controlling cycle instruction
Controlling cycle of relay-controlling
No.
Process
Remarks
1
Close the
vacuum lid
The machine starts to work.
2
Vacuumizing
The machine begins to vacuumize to extract the air in the
vacuum chamber.
The “ON”indicator of vacuum time relay lights.
The pointer of the vacuum gauge shifts slowly t0 left side.
The “UP”indicator of vacuum time relay lights when the
vacuumizing finishes.
3
Gas-filling (if
any)
The gas-filling begins and fills gases to the bags as soon as
the vacuumizing finishes.
The “ON” indicator of gas-filling time relay lights.
The pointer of the vacuum gauge shifts slowly t0 left side.
The “UP” indicator of gas-filling time relay lights when the
gas-filling finishes.
4
Sealing
The sealing begins as soon as the vacuumizing and gas-filling
finish.
The “ON” indicator of sealing time relay lights.
The pointer of the vacuum gauge keeps stay.
The “UP” indicator of sealing time relay lights when the sealing
finishes.

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5
Cooling
The cooling begins and cool the sealed bags as soon as the
sealing is completed.
The “ON” indicator of cooling time relay lights.
The pointer of the vacuum gauge keeps stay.
The “UP” indicator of cooling time relay lights when the cooling
finishes.
6
Deflating
The deflating begins as soon as the sealing is completed. The
air comes into the chamber and the pressure inside the
chamber is equal to the outside. The vacuum lid will open
automatically.
The pointer of the vacuum gauge shifts to right dramatically.
7
Complement
The pointer of the vacuum gauge return to the 0 position and
the vacuum lid opens automatically.
All the indicator of time relays goes out.
The products are packed well.
Controlling cycle of computer-control panel
No.
Process
Remarks
1
Close the
vacuum lid
The machine starts to work.
The indicator lights.
2
Vacuumizing
The machine begins to vacuumize to extract the air in the
vacuum chamber.
The indicator in front of Vacuumizing lights.
The monitor: the value decrease second by second from the
set time (maximum 99s).
The pointer of the vacuum gauge shifts slowly t0 left side.
3
Gas-filling (if
any)
The gas-filling begins and fills gases to the bags as soon as
the vacuumizing finishes.
The indicator in front of Gas-filling lights.
The monitor: the value decrease by 0.1 second each time from
the set time (maximum 9.9s).
The pointer of the vacuum gauge shifts slowly t0 right side.
4
Sealing
The sealing begins as soon as the vacuumizing and gas-filling
finish.
The indicator in front of Sealing lights.
The monitor: the value decrease by 0.1 second each time from
the set time (maximum 9.9s).
The pointer of the vacuum gauge keeps stay.
5
Cooling
The cooling begins and cool the sealed bags as soon as the
sealing is completed.
The indicator in front of Cooling lights.
The monitor: the value decrease by 0.1 second each time from
the set time (maximum 9.9s).
The pointer of the vacuum gauge keeps stay.