Sino Instruments HS711A User manual

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User manual
Hydraulic Comparator
HS711A

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Claim
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 insufficiently qualified skilled
personnel or unauthorized modifications 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.
Safety information
Symbol
Warning
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.
①Operate by professional
②Use the product only as specified
warns you against actions that can cause injury to people or damage to
the instrument.
points out useful tips,recommendations and information for efficient
and trouble-free operation.
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 specifications must not be attempted.

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③Please use non-damage goods
④No Disassembling
⑤Don’t calibrate oil gauge
⑥Store the item with pressure
Labeling
Huaxin Instrument(Beijing) Co., Ltd.
Manufacturer
Model
Product Name
Pressure Range
Series Number
Date of Manufacture
Model
HS711A
Product
Hydraulic Comparator
Range
(0~600bar)
No.
17016038
Date
2017.01
Don’t use the product if it is damaged.
Disassembling may cause physical injury or equipment damage.
Only qualified technicians are allowed to fix the equipment. Please
call our service staff for repair instruction and guidance if there
would be anything wrong.
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 oil gauge.
If this equipment will be in idle for a long time, please close the relieve
valve and provide pressure about 2bar.In order to avoid the air enter into
the item inside. That will affect the system stability when you use it next
time.

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Claim
Safety
1. Summary - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - 5
2. Technical Specification - - - - - - - - - -- - - - - - - - - - - - - - -- - - - - -5
3. Components - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --6
4.Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- -- - - - - - - - - - -7
5.Troubleshooting -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- 8
6.Maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --- - - -8
7.Support - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - -- -- - - --- -- -- -- -9

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1.Summary
HS711A Hydraulic comparator adopts special process with high quality aluminum alloy
and pining inside design, which make it high sealing quality, easy to clear. With the
advantage of fast connection ,easy generate pressure , quick pressurizing, long time keep
pressure, higher accuracy, it have been widely used in Lab and Field on the pressure
gauge calibration.
Functions
HS711A generate pressure for calibrating pressure gauges, such as pressure (different
pressure) transducers, precision pressure gauges, general pressure gauges and other
pressure gauges. It can be widely used in power, chemical, petrol, metallurgy, metering,
military industry, etc.
Features
Compact structure, light weight
Pressure range up to 600bar
Easy operation, saving time and energy
Fast connection, quick pressurizing
Easy increasing pressure, convenient maintenance
Simple and smart appearance
2.Technical Specification
Model:HS711A Hydraulic Comparator
Generated pressure range:(0~600)bar ; (0~700)bar
Working medium: Distilled water
Adjust resolution:0.001bar(0.1kPa)
Material: Stainless Steel/Aluminum for body; Stainless steel for outputs; Buna-N for
seals
Output interface connection:M20×1.5Female
Package: Carrying black bag. Specialized cartons and foam wrap(optional)
Dimensions:320L×240W×140H(mm)
Weight:5.0kgs

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3.Components
Output
There are two output interface. one for standard gauge, the other for gauge under test.
Venting screw
Release the venting screw during operation ;otherwise be tightened.
Relieve
Clockwise rotate the relieve knot before generating pressure，slowly anti clockwise rotate
to release the inner pressure when finished calibration.
Lead screw
Clockwise rotate the lead screw to increase the pressure, anti clockwise rotate to decrease
the pressure (pressure range :0~600bar).
Hand pump
Clockwise rotate the hand pump to pre-generate the pressure (pre-generate pressure
range: 0~50bar ) before use lead screw to increase the pressure.
Water can
Store distilled water
Plug
relieve
plug
output interface
hand pump
Oil/water cup
venting screw
lead screw

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Please fasten plug after calibration test, only release it during testing process.
4.Operation
Pressure gauge 250bar(25Mpa) as example.
(The calibration points:0bar 50bar 100bar 150bar 200bar 250bar)
A. Lay the HS711A on the test bench. anti-clockwise the relieve valve, unscrew venting
screw . Remove the plug of the outputs, connect the standard gauge and guage under test
on the two output interface
B. Please fill the work medium (distilled water) before calibration. The water position
should be at least 2/3 of the whole water can.
C. Anti-clockwise rotate the hand pump and lead screw till cannot rotated.
D. Record 0bar record, then close the ''relieve'' valve, clockwise rotate the lead screw to
generate the pressure till the standard gauge shows to about 20~30bar.
E. Then clockwise the hand pump to increase the pressure to calibration the normal
pressure gauge on the calibration points, then anti-clockwise rotate hand pump to
decrease pressure on the calibration points for calibration.
F. After finished calibration, anti-clockwise the relieve valve to release the pressure till
all the inside pressure have been released. then remove the standard gauge and gauge
under test. tighten the plug and venting screw. The whole calibration cycle have finished.
Remarks:
Please tighten the plugs after all the tests have been finished.
NOTES:
1.There must be no pressure in the system when removing pressure gauge.
2.Replace the O-rings regularly.
3.The working medium of item is water, please don’t mix any other liquid.

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5.Troubleshooting
There are some main faults of HS711A mentioned below after long term usage, the
operator can analyze and eliminate problems by these methods.
Disassemble and repair the HS711A with pressure is prohibited.
Faults
Cause
Solution
Water leakage
The O-ring seal is loose or damaged
Replace the O-ring
There is large damage on the sealing faces
of gauge under test
Check the sealing faces
Lead screw couldn't
generate pressure
No enough medium in water cup
Add medium
The internal O-ring is damaged
Replace the O-ring
The gauge under test has huge capacity
Replace the gauge under test
The pressure is
instability, the
standard gauge
depressurized quickly
Check the instrument to make sure there is
no leakage of water. Otherwise the O-ring
is damaged or there is connection
loosening
Replace O-ring, or
reassembling
Pressurize without gauge under test. if the
instrument doesn’t leak pressure, this
indicates gauge under test has problem.
Otherwise there is problem with device or
standard gauge. Check the standard gauge
and device separately
Replace standard gauge or
gauge under test
5.Maintenance
7.1. Keeping about 2bar pressure inside, and tighten the venting screw and relieve valve,
if the HS711A will be out of work for long time,
7.2 Tighten and fasten all the valve and plug to prevent water leakage during the
transportation. , it is necessary to packed with special carton and foam wrap.
7.3.Replace working medium regularly.
7.4.The working medium is distilled water or any water that can be used for calibrating
gauges.

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6.Support
The product specifications and other information contained in this manual are subject to
change without notice. If you have any questions, please call our services hotline:400
611 3558 or Tel:[phone]