Sino Instruments HS703 User manual

User manual
HS703
Pneumatic Comparator

2
The operating instructions are parts of the products and must be kept in
the immediate vicinity of the instrument and readily accessible to skilled
personnel at any time.
Skilled personnel must have carefully read and understood the operating
instructions prior to beginning any work.
The manufacturer's liability is void in the case of any damage caused
by using the product contrary to its intended use, non-compliance with
these operating instructions, assignment of insufciently qualied skilled
personnel or unauthorized modications to the instrument.
HUAXIN reserve the rights to change the contents or form of these
operating instructions at any time without prior notice having been given.
Claim
......warns you against actions that can cause injury to people or
damage to the instrument.
...... points out useful tips,recommendations and information for
efcient and trouble-free operation.
In order to protect your products,your own and others safety,please read
this manual carefully before your operation,otherwise it may cause trouble.
Huaxin is not liable for any safety problems or damages caused by misuse or
incorrect operation.
Safety information
Symbol
Warning
The system must only be operated by trained and authorised personnel
who know the manual and can work according to them.
Any operation not included in the following instructions or outside the
specications must not be attempted.
Don’t use and disable the Product if it is damaged.
Operate by professional
Use the product only as specied
Please use non-damage goods
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2
3

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Disassembling may cause physical injury or equipment damage.Only
qualied technicians are allowed to x the equipment.Please call our
service staff for repair instruction and guidance if there would be
anything wrong.
No disassemble
The item belongs to non-oil equipment, if you use the item to calibrate
oil gauge,there will be oil left behind in the system,and it will not
provide pressure anymore.Meanwhile that may pollute air gauge.
If this equipment will be in idle for a long time,please shut off the
relieve valve and provide a little pressure.In order to avoid the air
enter into the item inside .that will affect the system stability when
you use it next time.
Don’t switch the reverse valve(positive/vacuum)when there is
pressure inside the system.if you switch the reverse valve when the
whole system have pressure,maybe the hand pump will spring up and
cause personal hurt.
If the item left idle, please operate the reverse valve once time each
month.Or the reverse valve couldn’t be use, at this time, please call
our service clerk.
Don’t calibrate oil gauge
Store the item with pressure
Pay attention to reverse valve
Operate reverse valve regularly
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4
6
7
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Labelling
Huxin Instrument(Beijing)Co.,LTD
Model
Range
Product
No.
Date
(-0.95-60)bar
Pneumatic comparator
140902799
2014.09
HS703
Manufacturer
Model
Product name
Pressure range
Serial number
Date of manufacture

4
Claim
Safety
1.Summary 1
2.Technical Specication 1
3.Components 2
4.Working principle 3
5.Operation 4
6.Troubleshooting 7
7.Maintenance 8
8.Support 8

1
1.Summary
2.Technical Specication
Model:HS703 Pneumatic comparator
Generated pressure range:(-0.95~40)bar,(-0.95~60)bar
Working media:Air
Adjust resolution:0.0001bar(10Pa)
Material:Body:Stainless steel/Aluminum
Seals:Buna-N
Output interface connection:M20×1.5Female
Output quantity:Two
Package:Carrying black bag.Carrying case(Select)
Weight:2.7kg
Dimension:286L×198W×140H(mm)
HS703 Pneumatic comparator is portable structure and designed to generate
pressure from vacuum to 60bar.Built-in lter protects the pump from dirty
and make maintenance easy and convenient.The F-adjust valve could
accomplish 0.0001bar(10Pa)pressure resolution.Especially the lever lead
screw design makes user operate in economize labor.The design of reverse
valve makes the switch of vacuum and positive pressure more smooth.Two
standard pressure outputs are easy to connect gauges under test without
using the wrenches.It widely calibrates pressure instruments in field and
laboratory.
HS703 provides pressure measurement for calibrating pressure instruments
in eld and laboratory.It can be extensively used in power,chemical,petrol,
metallurgy,metering,military industry,etc.
Portable structure
Built-in lter protects the pump from dirty and make maintenance easy
and convenient
User operate in economize labor
Characteristics
Functions

2
6
7
Hand pump
Generate pressure about 10-12bar by run the hand pump up and down
repeatedly.Hand pump will realize prepressing function.
Lead screw
Increase pressure by turning the lead screw clockwise,decrease pressure
by turning the lead screw anti-clockwise.
Reverse valve (positive/ vacuum)
Press the button in order to switch between positive pressure and vacuum.
(Push the reverse is positive pressure calibration, pull for vacuum).
Relieve valve
Have to close before pressure generation (clockwise).Slowly Open it to
relieve the pressure(anti-clockwise).
F-adjust valve
To realize the ne adjustment of pressure value (clockwise to increase
pressure).
Plugs
Tighten it up when not in use.
Output
There are two outputs.one is designed for standard gague,the other for
gauge under test.
1
2
3
4
5
3.Components
7
2
53
6
1
4

3
4.Working principle
Output Output
F-adjust valve
Reverse valve
Positive pressure
Hand pump
Vacuum
Lead Screw
Relieve valve
HS703 is composed of hand pump,lead screw,F-adjust valve,relieve
valve,reverse valve,outputs,etc.The pressure gauge can be installed
quickly.Push or pull reverse valve to switch positive pressure position and
vacuum position. It is easy to prepressurize by running hand pump up and
down,then compress the work medium by turning lead screw clockwise(anti-
clockwise),that could realize pressure increasing(decreasing)secondary.Fine
adjust the F-adjust valve to reach desired point more accurately.

4
Record 0bar record and close the relieve
valve.Providing pressure about 4 bar by hand
pump up and down,then adjust the F-adjust
valve to second standard point(5bar).
D
Remove the plugs of outputs.Connect the
standard gauge and the gauge under test to the
two outputs interfaces separately, it must rm
in place. Otherwise,it will be leakage.
Set F-adjust valve to the mid
position,and for lead screw,turn
all the way out.
B C
Rotate the lead screw clockwise to make
pressure value close to next standard points,and
adjust F-adjust valve to get exact values. Pressure
rising&stabilize to 10bar,15bar,20bar,25bar in
turn.Meanwhile,record the data.
E
5.Operation
Put HS703 on the level;Turn the relieve valve
anti-clockwise to open it and make sure the
reverse valve is in positive pressure position.
Take pressure gauge 25bar(2.5Mpa)as example(The standard point:0bar,5bar
,10bar,15bar,20bar,25bar)
For example(1):
A
Pressurizing by
turning it clockwise
Turn it clockwise
until closed
Fine adjust
Up and down
Fine adjust
Open by turning it
anti-clockwise
Connect
Push it to positive
pressure position
Turn all the way
out anti-clockwise
In the mid position

5
Finish the Loop calibration and open the
relieve valve to release the pressure.
Change gauge under test and
calibrate the next one.
GH
Loop calibration:Decrease pressure by
turning lead screw anti-clockwise (or
together with relieve valve),and adjust the
F-adjust valve to get exact values.Record
the data when the pressure stabilize on
20bar,15bar,10bar,5bar and so on.
F
Take vacuum pressure gauge as example (The standard point:0bar,-0.2bar,
-0.4bar,-0.6bar,-0.8bar,-0.95bar)
For example(2):
Open
Depressurizing by turn
it anti-clockwise
Fine adjust
Change gauge
Put HS703 on the level;Turn the relieve
valve anti-clockwise to open it and make
sure the reverse valve is in vacuum
position.
A
Remove the plugs of outputs.Connect the
standard gauge and the gauge under test to
the two output interfaces separately, it must
rm in place.Otherwise,it will be leakage.
Set F-adjust valve to the mid
position,and for lead screw,turn all
the way in.
B C
Connect
Turn all the way
in clockwise
In the mid position
Open by turning it
anti-clockwise
Pull it to select
vacuum position

6
Record 0bar record and close the relieve
valve.Providing pressure by hand pump and
leading screw let pressure near -0.2bar,then
adjust the F-adjust valve to get exact pressure
value.
D
Use the hand pump leading screw and
F-adjust valve to calibrate other standard
point(-0.4bar,-0.6bar,-0.8bar).If the pressure
value is up to -0.92bar,pls create negative
pressure by turning lead screw anti-
clockwise until full scale.
E
Chang gauge under test and
calibrate next one.
H
Finish the loop calibration and open the relieve
valve to release the pressure.
G
Loop calibration:Turning lead screw
clockwise (or together with relieve valve), and
adjust the F-adjust valve to get exact values.
Record the data when the pressure stabilize on
-0.8bar,-0.6bar,-0.4bar, -0.2bar and so on.
F
Remark:
1.Hold the lead screw with each hand,turn in and out slowly to complete
Turn it clockwise
until close
Up and down
Fine adjust
Open
Change gauge
Up and down
Fine adjust
Fine adjust
Anti-clockwise
Slowly,anti-clockwise
Clockwise

7
6.Troubleshooting
There may be some faults of HS703 methioned below after long term
use,the maintainer can analyse and eliminate problems by these methods.
Make sure to release all pressure of system.It is forbidden to disassemble
and repair the product with pressure.
ne adjustment.
2.Please put on the plugs after all the tests have been nished.
3.Above pictures are just for reference.
NOTES:
1.There must be no pressure in the system when removing pressure gauge.
2.Replace the O-rings regularly.
3.The item is non-oil equipment.please don’t mix any liquid.
4.The reverse valve should be switched the correct position before the
pressure generating.Otherwise,that will leak and do not generate pressure.
Faults Cause Solution
Leakage The reverse valve (positive / vacuum)
is not in the position
Push/pull the reverse
valve to the right position
The hand pump is
up
There is foreign matter in the
instrument
Disassembling and
cleaning
Hand pump couldn’t
generate pressure
The reverse valve (positive / vacuum)
is not in the position
Push/pull the reverse
valve to the right position
The pressure is
instability,the
standard gauge
depressurized
quickly
Check the instrument to make sure
there is no leakage of air.Otherwise
the O-ring is damaged or there is
connection loosening
Replace O-ring,or
reconnect the instrument
Pressurize without gauge under
test.if the instrument doesn’t leak
pressure,this indicates problem with
gauge under test.Otherwise there
is problem with device or standard
module.Check the module and device
separately
Replace standard gauge
or guange under test

8
8.Support
The product specications and other information contained in this manual
are subject to change without notice,if you have any questions,please call
our services hotline:[phone] or Tel:[phone]
7.Maintenance
7.1.If this equipment will be in idle for a long time, please turn the lead screw
clockwise till it could not move anymore,shut off the relieve valve and put on
the plugs.Provide a little pressure by running the hand pump 2-3 times.
7.2.If HS703 needs to take a long distance transport,please put on all plugs
to prevent leakage of work medium.It is necessary to pack with specialized
cartons and foam wrap.
7.3.The item belongs to non-oil equipment,It is forbidden to calibrate oil gauge.
Operate the lead screw and hand pump regularly.

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Tel:[phone]/ Fax:[phone]
Web:http://www.sino-instruments.com
HUAXIN INSTRUMENT(BEIJING)CO.,LTD
E-mail:[email protected]/
Add:No.11,Chuangxin road,Changping,Beijing,102200,China.