BALUN BL506 Manuale utente
User Manual
Model BL506 Vacuum Deadweight Tester
Dear Customer,
We are delighted that you have decided to buy a BL506 vacuum deadweight tester. Please read
these operating instructions for the BL506 vacuum deadweight tester carefully before connecting
and configuring it, and operate the device in compliance with the instructions. Operational safety
and the function of the device can only be guaranteed if the generally applicable legal safety and
accident prevention regulations, plus the safety instructions provided in the operating instructions,
are complied with.
We do not accept liability for any damage caused by improper use or incorrect operation. Please
ensure that all persons operating the device have read and understood the operating instructions.
Keep these operating instructions in a safe place so that they are accessible at all times when
needed. If you require further information, please don’t hesitate to contact with us using the
following contact details:
1322, F/3, Bldg 1, 33 Zique Rd, Haidian, Beijing 100095, China
Phone: +86 (0) 10 6240 6768 [email protected] www.baluntech.com
TABLE OF CONTENTS
1. INTRODUCTION .................................................................................................................................................1
2. SPECIFICATION .................................................................................................................................................4
3. SAFETY REQUIREMENTS ..................................................................................................................................9
4. SETTING UP THE DEAD WEIGHT TESTER ...................................................................................................... 11
5. OPERATION .................................................................................................................................................... 16
5.1 PREPATATION .......................................................................................................................................... 16
5.2 VACUUM CALIBRATION OPERATION......................................................................................................... 16
5.3 PRESSURE CALIBRATION OPERATION .............................................................................................. 21
6. MAINTENANCE ............................................................................................................................................... 25
6.1 PISTON DISASSEMBLY ....................................................................................................................... 25
6.2 PISTON CLEANING ............................................................................................................................. 25
6.3 PISTON RE-ASSEMBLY ....................................................................................................................... 26
7. TROUBLESHOOTING ...................................................................................................................................... 27
Page 1
1. INTRODUCTION
1.1 DESCRIPTION
With high precision accuracy, the BL506 vacuum deadweight tester have dual vacuum and pressure modes. Pressure
and vacuum application can be operated by hand pump or external gas supply. To guarantee an excellent metrology-logic
characteristics, all pistons and cylinders are made of tungsten carbide. Because of the extreme hardness of this material,
the pressure distortion (expansion) coefficient is negligible. The low friction coefficient provides minutes of turning with just
a little swing of the masses.
1.2 OPERATING PRINCIPLE
A deadweight tester is based on a high accurate manufactured piston and cylinder assembly. This cylinder is mounted in
a column. The piston can rotate and freely move up and down. Accurately calibrated masses are loaded on top of the
vertically mounted piston. A pressure is applied on the bottom of the piston to lift the piston with masses. This creates a
balance between the downward force made by the masses and the upward force made by the pressure. With the known
effective area of the piston the pressure can be calculated. In formula: P=F/A, Where:
P = the pressure being derived
F = the force applied by the weights
A = the effective area of the piston cylinder
Page 2
1.3 DETERMINE OF THE PRESSURE
The reference level of the deadweight tester is at the top of the sealing of the pressure connection. If the weight set is
marked with a pressure unit (MPa; bar; psi or kg/cm²) the pressure can be determined by the formula:
P= m·g(1
－
ρ1
／
ρ2) .
So (1
＋
λPo) [1
＋
(α1
＋
α2)(t
－
20)]
Where is:
P: Measurement pressure Pa (MPa)
m: Mass (kg)
g: Standard gravity 9.80665 m/s² or customized local gravity (m/s²)
ρ1: The density of the ambient air at the reference level, the typical air density value is 1.2 kg/m³
ρ2: The density of mass, ρ value of stainless steel =7.93x10³kg/m3 , ρ value of carbon steel =7.8x103kg/m3
So: Effective area at zero pressure @ t=20℃ (m²)
λ: Pressure distortion coefficient piston cylinder system (MPa-¹)
Po: It is the pressure value when piston system doesn’t be deformed, can be instead by P (MPa)
α1: Thermal expansion coefficient of piston, the typical value is 4.5×10-6 ℃-1
α2: Thermal expansion coefficient of cylinder, the typical value is 4.5×10-6 ℃-1
T: The temperature of piston when the deadweight tester is in the status of measurement (℃)
1.4 PISTON CYLINDER ASSEMBLY
Page 3
The piston cylinder assembly is the heart of the dead weight tester and responsible for its high accuracy. We
manufactures piston cylinder with accuracies from 0.05% up to 0.005% of reading. To give an idea of the manufacturing
skills, the space between the piston and the cylinder is in the um range and can only be measured in a climate room. To
guarantee an excellent metrology-logic characteristics, all pistons and cylinders are made of tungsten carbide. Because of
the extreme hardness of this material, the pressure distortion (expansion) coefficient is negligible. The low friction
coefficient provides minutes of turning with just a little swing of the masses.
1.5 EFFECTIVE AREA
For all dead weight testers, the effective area is determined by cross floating with a known reference primary standard
deadweight tester. The exact pressure can be calculated. As per the formula of the item 1.4, compensation factors are
listed for air buoyancy, local gravity, surface tension of the used oil and temperature and pressure expansion of the piston
cylinder assembly. All necessary data are listed in the calibration certificate provided with each dead weight testers.
1.6 MASS SET
The masses of the dead weight tester are made of carbon steel or nonmagnetic stainless steel. They are laser marked
with a serial number and mass or the equivalent pressure. The weights are tare out to add stainless steel to an internal
chamber. This is easy for recalibration or adjustments for gravity compensation. The mass of all weights are listed in the
certificate. For small pressure steps, a box with small weights is optionally available.
Page 4
2. SPECIFICATION
2.1 GENERAL SPECIFICATION
Accuracy: 0.05%rdg, 0.02%rdg, 0.01%rdg, 0.005%rdg
Piston and cylinder material: Tungsten carbide
Mass material: 304SS (Forged 316 stainless steel is optional)
Tester base and pump material: Stainless Steel
Medium: Dry and clean air, or nitrogen
Pressure connector: Metric, (NPT and BSP is optional)
Gravity: Standard 9.80665 m/s², or customize local gravity.
Tester dimension: 500mm(H) x 650mm(L) x 500mm(D) / Pump dimension: 225mm(H) x 455mm(L) x 380mm(D)
Tester weight: Appro.25kg / Pump weight: Appro.15kg
Recalibration: Every 2-5 years
2.2 PRESSURE RANGE SELECTABLE SHEET
P/N
Pressure
A
ccuracy
Area
K
n
. factor
Mass Set
KYQZ100
(
-
100~100) kPa
0.05, 0.02, 0.01, 0.005
10cm
2
10kPa / kg
10kg + 10kg
KYQZ160
(
-
100 ~ 160) kPa
0.05, 0.02, 0.01, 0.005
5 cm
2
20kPa / kg
5kg + 8kg
KYQZ250
(
-
100 ~ 250) kPa
0.05, 0.02, 0.01, 0.005
5 cm
2
20kPa / kg
5k
g + 12.5kg
KYQZ400
(
-
100 ~ 400) kPa
0.05, 0.02, 0.01, 0.005
5 cm
2
20kPa / kg
5kg + 20kg
KYQZ600
(
-
100 ~ 600) kPa
0.05, 0.02, 0.01, 0.005
2 cm
2
20kPa / kg
5kg + 30kg
KYQZ1M
(
-
100 ~ 1000) kPa
0.05, 0.02, 0.01
2 cm
2
20kPa / kg
5kg + 50kg
Page 5
2.3 MASS QUANTITY AND MEASURING RANGE
Part # Pressure
Piston
& Bell Pressure measure range and Mass Quantity
KYQZ100 (-100~100)kPa 5kPa
Pressure
-
10kPa
-
5kPa
5kPa
10kPa
Pieces
9
2
2
9
KYQZ160 (-100~160)kPa 5kPa
Pressure
-
10kPa
-
5
kPa
5kPa
10kPa
20kPa
Pi
eces
9
2
2
5
5
KYQZ250 (-100~250)kPa 5kPa
Pressure
-
10kPa
-
5
kPa
5kPa
10kPa
20kPa
50kPa
Pieces
9
2
2
2
1
4
KYQZ400 (-100~400)kPa 5kPa
Pressure
-
10kPa
-
5
kPa
5kPa
10kPa
20kPa
Pieces
9
2
2
15
12
KYQZ600 (-100~600)kPa 5kPa
Pressure
-
10kPa
-
5
k
Pa
5kPa
10kPa
20kPa
50kPa
100kPa
Pieces
9
2
2
2
1
1
5
KYQZ1M (-100~1000)kPa 5kPa
Pressure
-
10kPa
-
5
kPa
5kPa
10kPa
20kPa
50kPa
100kPa
Pieces
9
2
2
2
1
5
7
Page 6
2.4 SCOPE OF DELIVERY
Page 7
2.5 INSTRUMENT OUTLINE FOR VACUUM DEADWEIGHT TESTER BASE
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