Used PG7601 primary pressure
standard for great sale

What we offer:
An used (second hand), but complete and in excellent general condition PG7601 primary pressure standard is offered here, with a purchasing price that we believe even lower than half in respect to the official Manufacturer European list pricing.
If you don’t know what exactly is a PG7601 pressure standard, have a trip here before.
As better explained later, the piston-cylinder have indeed just some weeks (or just few months overall) of true operation, so this should allow us to consider this high accuracy pneumatic standard indeed as like a brand new condition. Offered primary standard is accomplished both by the manufacturer calibration certificates (NIST traceable) for the piston-cylinder assembly and the mass set, as also by a further full title Cofrac Lne (French member of EA circuit) nominal calibration certificates too (copies of such certificates are available under request). The PG7601 "hystorical" is fully documented and it can submitted to any of your further request for more detail. Where it will be considered necessary, and under request, we can also supply you the serial number of our PG7601 for any of your further verification you wish.   PG7601 we offer is free from any taxation (VAT don’t apply), as it was a company asset. 

Where we are

Obviously we wish to ensure to any purchaser to see the system before any purchasing, and this can be made available for any evaluation here in Italy, in the centre of Italy, near Ancona, on the opposite sea side of Rome.  After a previous agreement and with a reasonable warning time, we can make available our primary pressure standard for any of your visit and investigation. Please note that if you will be satisfied by what you will see, and if you will indeed buy our PG7601, we are available to deduct the documented travel expenses you faced to came here in Italy, from the agreed PG7601 price amount. If you are interested, please feel free to contact us without any arising obligation.

Who we are

We are a small Italian company that unfortunately have failed its metrological services business plan due to several unpredictable reasons, the main of which shall be addressed to an unexpected low and delayed local market answer to the nature of our services. After some “years” of bureaucracy, we are now going to close definitely the company, and obviously, before this, we are trying to sell all of our company instrumental assets.
 

Offered PG7601 actual configuration

The full complete PG7601 high accuracy pressure standard system we are going to sell, is capable to generate up to 70 bar pneumatic pressure, and it was used by us only with certified clean, high purity nitrogen bottles (not included in our offer). The nitrogen bottle inlet pressure is easely controlled by a MCPI-1000 (made by the same manufacturer of PG7601) manual pressure controller (that we include in the same "bundle" with our PG7601 pneumatic pressure standard offered here). Consequently, the full PG7601 "package" offered here is currently configured and equipped as follow:

- PG-7601 gas operated piston gauge;
- PG terminal (operator interface), for PG7601 operation;
- MCPI-1000 manual pressure controller, complete with user manual & PG7601 connections;
- PC-7600-200 Kn = 200 kPa/kg ceramic piston, tungsten cylinder (with retaining sleeve);
- manufacturer piston cylinder calibration certificate;
- additional Cofrac LNE France EA) piston cylinder nominal calibration (area error: < than 20 ppm)
- MS-76000 set of 35 kg mass set, complete with trim masses
- manufacturer mass set calibration certificates;
- additional Cofrac LNE France (EA) mass set nominal calibration (mass error: < than 5 ppm)
- mass carrying tray with protective cover;
- mass loading bell;
- bell jar, for vacuum operation (vacuum pumps and required connections not supplied);
- wear subjected parts kit;
- operating manual (English);
- two military standard storage and transportation cases + piston cylinder storage container.

If you will need any further clarification, please do not hesitate longer and feel free to ask for any further detail or information. The system is indeed in a true "mint condition", and we are not afraid of any verification you wish to perform over our very high accuracy pressure standard system. Please remind that also the original bell jar for vacuum operation is included in the "bundle" (vacuum pumps and any further required vacuum connections are not included). On the side picture, you can see how you will receive the PG7601 if you will buy it, as we will supply inside its original military standard storage and trasportation cases, including the piston cylinder storage container.  Trasportation of PG7601 to your site will be at your charge and responsibility.




DEFINING A NEW GENERATION OF PRESSURE STANDARDS

The pressure balances fundamental operating principle and excellent long-term stability have made it an indispensable tool in high accuracy pressure metrology. As accuracy levels increase, quality assurance requirements intensify and automation spreads through the work-place, the pressure balance must evolve to continue to fill its essential role in the measurement system. The PG7601 pressure calibration system - by the thorough application of new technology combined with the refinement of traditional techniques - has been designed from the ground up to meet this challenge.

OPTIMISING FUNDAMENTAL PRESSURE BALANCE TECHNOLOGY

The PG 7601 pressure balance incorporates many improvements and refinements of traditional pressure balance technology. These include;

• A new family of large diameter piston-cylinders. A high purity ceramic material is used for the low-pressure pistons to reduce weight and improve performance. New proprietary lapping techniques achieve geometry within 0.1 micron of ideal and radial clearances of less than one micron. The combination of excellent geometry, small annulus and large diameter minimises possible gas species and operating mode effects.
• The piston-cylinder mounting system is simplified to eliminate all parasitic sources of stress and to allow the piston-cylinder and its mounting sleeve to be mounted as a single assembly in a simple one-step procedure without exposing critical piston-cylinder surfaces.
• An automated piston rotation system operates "as needed" to maintain optimum rotation speed without interfering with piston position or movement. The operator is alerted prior to engagement.
• The vacuum reference is contained under a one-piece bell jar, all metallic surfaces exposed to vacuum are electropolish finished low carbon stainless steel, and large diameter (KF25) vacuum connections are used to ensure rapid evacuation and lower ultimate pressures. Piston position and rotation rates are detected by non-interfering LVDT and optical sensors.
• Power supplies and displays are mounted in the PG Terminal remote from the pressure balance platform to avoid on-board heat sources and thermal instability. 

MEASURING AND ACCOUNTING FOR ALL SYSTEM VARIABLES. REAL TIME

The pressure defined by a high accuracy pressure balance is affected by many environmental and system variables. In the past, the technical and practical difficulties of accurately obtaining values and calculating for all of the significant variables led to certain parameters being assumed to be constant or ignored completely. Though this may have been acceptable at the +100 ppm accuracy level, to assure accuracy of +50 ppm or better it is indispensable that all of the parameters are accurately accounted for. PG7601 does this systematically.

On-board PG7601 sensors continuously measure ambient pressure, temperature and humidity, vacuum reference, piston-cylinder temperature and piston behaviour. Using these real time measurements and extensive stored information, embedded software applies the complete pressure equation and delivers fully validated pressure to mass or mass to pressure data - every 2 seconds.


REMOVING OPERATOR INFLUENCE FROM THE MEASUREMENT PROCESS

The PG7601's automated control features and extensive on-board measurement and analysis capabilities are used to remove the influences of operator technique and judgment on measurement results. The operator interacts with the system through the PG Terminal's keypad and display. After entering the desired pressure, the system prompts for the mass value to be loaded. Once the operator confirms that the mass has been loaded, the PG7601 system takes over executing all the necessary functions to float and rotate the piston, evaluate operating conditions and provide a "ready" indication when all necessary conditions for in-tolerance measurements are met.

Automated functions and objective system criteria rather than operator technique and subjective judgment assure, among other things, that the vacuum reference is adequate, that pressures are set in a repeatable manner, and that piston rotation speed and fall rate are within limits. On-board diagnostics assist the operator in troubleshooting when ready conditions cannot be achieved. For example, excessive decay in piston rotation speed may indicate an unclean piston-cylinder or an excessive fall rate implies a leak in the test system. Manual override capability of all functions is also available to bypass automated control when desired.

Finally, COMPASS 7601 computer software is available to interact with the system and step the operator through complete automated calibration routines, record test results in data files and edit and print calibration certificates.

PUTTING TOGETHER A SYSTEM

A PG7601 system is made up of components ordered separately to tailor a system to your specific requirements. PG7601 system components include:

• The PG7601 pressure balance platform with the PG Terminal.
• The mass set.
• Piston-cylinder(s). One to three assemblies depending on the pressure ranges desired.
• A pressure generation and control component for manual or automated operation.
• System configuration accessories: interconnecting hardware, vacuum pumps.
• Calibration assistance software.

Pressure Balance Platform with Terminal
Part Number: PG7601

Purpose: The PG7601 platform is designed for mounting of the piston-cylinder assembly, rotating the piston, applying pressure beneath it and establishing a vacuum reference around the mass load. It includes on-board electronic sensors, signal conditioning and logic for determination of all ambient and piston-cylinder behaviour variables and computation of fully compensated pressure to mass and mass to pressure values. The PG Terminal is a miniature console unit that contains the platform's power supplies and provides a keypad and display for simple local user access to all system functions. System functions can also be accessed by simple ASCII commands over the included RS232 port and IEEE 488 interface.

Ordering description: PG7601 gas operated pressure balance complete with PG Terminal, mass carrying bell, bell jar, IEEE 488 and RS232 interfaces, spare wear subjected parts kit, accessories, user's manual, technical data, reusable storage and transport case.

Mass Set

Part Number: MS-7601 -35
Purpose: Applies the load to the piston-cylinder as needed to achieve the desired pressure increment. Mass set composition allows any load between 200g and 35kg to be loaded within 10 mg.

Ordering description: 35kg mass set complete with trim masses, mass tray, dust cover, calibration certificate, two reusable storage and transport cases.

Piston Cylinders

Part Numbers:
PC-7600-10 [5 to 350 kPa (0.7 to 50 psi)]

PC-7600-50 [25 to 1750 kPa (3.5 to 250 psi)]
PC-7600-200 [100 to 7000 kPa (14.5 to 1000 psi)]

Purpose: The basic metrological element that determines the pressure range. The final digits in the identifier specify the nominal Kn mass to pressure conversion coefficient in kPa/kg. The resulting ranges are from 0.5 x Kn to 35 x Kn corresponding to the minimum and maximum mass loads. The PG7601 mass set composition allows pressures to be defined in any engineering unit.

Ordering description: Kn = 10 (or 50 or 200) kPa/kg piston-cylinder assembly complete with retaining sleeve, calibration certificate, reusable storage and transport case.

Pressure Generation And Control Component Automated Pressure Controller
Part Number: PPC1 -1000

Purpose: Controlled by the PG7601 to provide automated pressure setting in the system and to automatically float and maintain piston position. Automated function can be overridden and pressure controlled by front panel push buttons or optional joystick when desired.

Ordering description: Positive shut-off pressure controller complete with power cord and user's manual.


Manual Pressure Controller
Part Number: MPC1-1000

Purpose: Provides manual pressure control to set pressure in the system and float and maintain piston position. 

Ordering description: Manual pressure controller complete with user's manual.

System Configuration Accessories Pneumatic Interconnections Kit With Test Connection
Part Number: PK-7601 -PPC/MPC

Purpose: Completes the pneumatic circuit of a PG7601 system by providing pneumatic interconnections between the PG 7601, an MPC1 or PPC1, and a test connection. The test connection is a quick connector on a mounting stand.

Ordering description: Interconnections kit for a PG7601 /PPC1 /MPC1 system including quick connection to test with 1/8"NPTF, and 37 degree flare quick connectors.


Vacuum Kit For Pressure Controller
Part Number: VA-PPC/MPC-REF

Purpose: Connects to PPC1 or MPC1 to provide vacuum capability for setting pressures under atmosphere. Needed only if the system will be used to define absolute pressures under atmospheric pressure.

Ordering description: Vacuum package for PPC1 /MPC1 with interconnecting hardware, vacuum pump and instruction sheet.


Vacuum Kit For PG 7601 Platform Reference
Part Number: VA-7601 -REF

Purpose: Connects to PG7601 reference vacuum port to evacuate the PG7601 bell jar. Needed only if the system will be used to define absolute pressures with a vacuum reference.

Ordering description: Vacuum package for PG7601 reference with interconnecting hardware, vacuum pump and instruction sheet.


High Accuracy Barometer
Part Number: RPM1 -A0015

Purpose: Interface with PG7601 to provide atmospheric pressure measurements with higher accuracy than the PG7601's internal sensor. Recommended for making absolute pressure measurements above atmospheric pressure without using a vacuum reference and for negative gauge pressures and gauge pressures very near atmospheric pressure.

Ordering description: RPM1 -A0015 reference pressure monitor complete with utility software, RS232 cable, calibration certificate, power cord and manual.

Calibration Assistance Software
Part Number: COMPASS®7601

Purpose: Standard personal computer software interacts with system to automate complete calibration routines, log test results in data files and edit and print calibration certificates.

Ordering description: Calibration software with user's manual.

SPECIFICATIONS

Piston-cylinders
Range 1 Kn = 10 kPa/kg	Pressure range: 5 to 350 kPa (0.7 to 50 psi) Nominal diameter: 35 mm Nominal area: 10 cm2 Material: Ceramic piston in tungsten carbide cylinder Nominal piston mass with head: 200 g Fall rate; Min. float time: 0.2 mm/min max., 25 min.
Range 2 Kn = 50 kPa/kg	Pressure range: 25 to 1750 kPa (3.5 to 250 psi) Nominal diameter: 1 6 mm Nominal area: 2 cm2 Material: Ceramic piston in tungsten carbide cylinder Nominal piston mass with head: 200 g Fall rate; Mm. float time: 0.5 mm/min max., 10 min.
Range 3 Kn = 200 kPa/kg	Pressure range: 100 to 7000 kPa (14.5 to 1000 psi) Nominal diameter: 8 mm Nominal area: 0.5 cm2 Material: Piston and cylinder in tungsten carbide Nominal piston mass: 200 g Fall rate; Min. float time: 1 mm/min max., 5 min
Mass set	Nominal total mass: 35kg Composition: 1 x 4.5 kg 5 x 5 kg 2 x 2 kg 1 x 1 kg 1 x 0.5 kg 2 x 0.2 kg 1 x 0.1 kg Trim mass set from 50 g to 10 mg Mass type: 5 to 1 kg: solid. 500 g to 100 g: adjustable 50 g to 10 mg: NIST S1 Material: AISI 304L non-magnetic stainless steel Finish: Electropolished Adjustment tolerance: ±20 ppm of nominal value Accuracy of reported values: ± 5 ppm
Pressure Measurements Accuracy in gauge and absolute modes using nitrogen, helium or air. Uncertainties are calculated using 2 sigma, root sum squared techniques as recommended in lSO/TAG4/WG3. Reported values are directly traceable to NIST. Note that current absolute accuracy is limited by the uncertainty on the reference values available for calibration, not by the intrinsic performance of the PG7601, so higher accuracies are possible when improvements in reference values occur.
Range 1	±20 ppm
Range 2	±35 ppm
Range 3	±50 ppm
System Temperature Operation: +10 to 40°C   Storage: -25 to 85°C Power requirements   85 to 264 VAC, 47 to 440 Hz, 22VA max Communication ports IEEE-488: for communication with a host computer   (3) RS232 ports COM1: for communication with a host computer COM2: for communication with RPM high accuracy barometer COM3: for communication with PPC pressure controller   PG terminal: serial and power lines On-board measurements - Temperature (internal)     Range: 0 to 40°C   Resolution: 0.01 °C   Accuracy: ±0.1°C   -Temperature (external)     Range: 0 to 40°C   Resolution: 0.1 °C   Accuracy: ±1 °C   -Atmospheric pressure     Range: 70 to 110kPa   Resolution: 10 Pa   Accuracy: ±0.2% of reading   -Vacuum     Range: 0 to 20 Pa Resolution: 0.01 Pa   Accuracy: ± 0.1 Pa or 10% whichever is greater   -Humidity     Range: 5 to 95% RH   Resolution: 1%   Accuracy: ±10%   -Piston position     Piston stroke: +4.5 mm   Resolution: 0.01 mm   Accuracy: ±0.2 mm Piston rotation system Automated with override capability. Operates "as needed" to maintain rotation rate within defined limits. "Not ready" indicated when rotation system is engaged Pressure control Automated (PPC1) or manual (MPC1) Processors Platform: Motorola 68302.   Terminal: Hitachi 64180 On-board data handling Continuous calculation of mass to pressure or pressure to mass from piston-cylinder and mass set file information and real time measurement of operating conditions. Continuous ready/not ready indication. Diagnosis of non-ready condition Supported test gases: Nitrogen, Helium, and Air
Due to a policy of continuous improvement all specifications are subject to change without notice. Want to see this page on our mirror websites: - PG7601 (ITA) - PG7601 (ITA).