PRESSURE BENCH OPERATING INSTRUCTIONS

Transcription

1 PRESSURE BENCH OPERATING INSTRUCTIONS

2 Overview: The pressure bench system allows the user to apply a variety of calibrated pressures to a variety of high and low pressure transducers. In addition the system has a pressure tank and impulse cylinder to provide for dynamic pressure changes. Plumbing: The bench has two air supply systems, a shop air line connected through a regulator, and a high pressure air bottle supplying the dead weight calibrator. For proper operation of the bench both air supplies must be turned on. The following diagram shows the plumbing of the system. Valve A: This valve supplies pressure from the regulator to the tank. Valve B: This valve supplies air from the regulator to the transducer manifolds at a low flow rate. This valve should never be open when Valve E is in the deadweight position.

3 Valve C: When this valve is open the tank is connected to the transducer system. This valve should never be open when valve E is in the deadweight position. Valve D: This is an electrically operated solenoid valve that will vent the tank when turned on. Caution should be taken that Valve E is not in the deadweight position when using the pressure tank. The high pressure bottle has a limited capacity and excessive flow from the dead weight tester out to atmosphere will drain the bottle quickly. Valve E: This valve will connect the transducer manifolds to either atmospheric vent or the deadweight tester. When not in use this valve should be in the closed position. Valve F: This valve connects the impulse air cylinder to the pressure manifolds. This valve should never be opened while pressure exists in the system or the cylinder may extend quickly causing injury. Valve G: This valve allows pressure into the high pressure manifold. Under normal operations this valve is open. Valve H: This valve allows pressure into the low pressure manifold. This valve should ONLY be open when very low pressures are being measured. There is a low pressure relief valve to prevent damage to the low pressure system, however care must be taken not to open this valve if high pressure is in the system, or damage to the low pressure transducers may result from the high pressure surge. Dead Weight calibrator: The dead weight calibrator is a device designed to apply very precise, known pressures. The unit is fed from a high pressure air bottle with a regulator set at 120PSI. The front of the unit contains two valves for operation. Under normal conditions they are set as indicated below.

4 The system generates pressure through a hanging weight system. The carrier sits on a small ball and hangs freely as indicated in the image below. It is important that the ball NOT be removed from the holder. There are two carriers and weight sets, one for Inches of water( shown hanging on the ball in the image to the left) and one for high pressure (PSI). The low pressure carrier weighs 4 of water and is never to be used with the high pressure weights. The high pressure carrier consists of a cylinder and a weight. The total weight of this combination is 1 PSI, and the pair is never to be separated. Pressures are generated by adding the appropriate weights to the carrier, and allowing the system to stabilize. Once the system has come to the pressure equal to the dead weights, a slight hissing sound can be heard from air escaping around the ball, and the carrier will balance on the suspended ball. Transducers: The system has a number of transducers connected to the high and low pressure manifolds as indicated on the plumbing diagram. These are powered and pre-wired to a jack panel to allow easy connection between the computer data acquisition system and transducer. Care should be taken to make sure that the ground connection of the daq system to the black terminal. Care should also be taken to never connect the 24V power supply to the daq system. Doing so will damage the data acquisition board permanently. Most of the transducers are voltage output, however two are not. The PX GV is a millivolt output transducer, and the PX GI is a 4-20ma current output. To make things easy, this transducer has a 500 ohm resistor placed on its output to allow the computer data acquisition system to be able to read it. When taking reading from this transducer remember to

5 convert the indicated voltage back into current. The data sheets for each of the transducers are included at the end of this manual. Computer program: The system is set up with a computer and data acquisition system to acquire data and store it to files. The system has two sections, a static display that shows the voltage of input lines 4 through 7, with both meters and digital readouts. There is a Save button to allow the data to be logged to a file. If no file name is entered into the file path box, then you will be prompted for one. If the name exists in the field, then the data will be appended to the existing file. This also saves whatever is in the comment field to that file. There is also a dynamic portion. This will allow the four channels to be acquired in a high speed mode and displayed to the screen. A field allows you to select an acquisition time between.5 and 10 seconds. If you are satisfied with the trace, a save button will allow you to record the traces to a text file for later analysis. Data trace file definition: The file is a tab delimitated file to allow easy import into a graphing or spreadsheet program. Trace Time per sample Data Time Voltage

Pressure Sensors for Test and Measurement For Precise Pressure Measurement in Static and Dynamic Applications Piezoelectric Pressure Quartz and PiezoStar crystals are the heart of Kistler piezoelectric

MAKING MODERN LIVING POSSIBLE Data sheet Pressure transmitter for industrial applications Type MBS 4500 The high accuracy pressure transmitter MBS 4500 is designed for use in almost all industrial applications,

Data sheet Pressure transmitter for general industrial purposes MBS 3000 and MBS 3050 The compact pressure transmitter, type MBS 3000, is designed for use in almost all industrial applications, and offers

1 2 3 4 5 6 7 8 Do not use corrosive or flammable gases or liquid with this product. Please use within the rated pressure range. Do not apply pressure beyond recommended maximum pressure, permanent damage

Data sheet Pressure transmitter for marine applications MBS 33M The standard pressure transmitter MBS 33M is designed for use in almost all marine applications, and offers a reliable pressure measurement,

BRQB011206E THE INSIDE STORY OF THE QB3: IP65 enclosure allows it to withstand the elements and be washed down without harm Precision pressure control vacuum to 150 psi (10.34 bar ) at high flow rate saves

Product Description The MediaGauge digital pressure gauges have better accuracy, longer life and standard multiple functions which make it a better choice than mechanical pressure gauges. The MediaGauge

Measurement Instrumentation When it comes to gauges, whether mechanical or digital, The Standard is Meriam. SM PICTURE. PERFECT. PRECISION. The Meriam Process Technologies name and corporate identity reflect

Type 1001 I/P & E/P Description The Type 1001 is a patented family of electropneumatic instruments that is used to reduce a supply pressure to a regulated output pressure which is directly proportional

PRESSURE TRANSDUCERS Keeping pressure under control AN ISO 9000 COMPANY Pressure Transducers Bailey & Mackey have been manufacturing high quality pressure instruments for over 75 years. The product range

Board Mount Pressure Sensors Line Guide The pressure is on. The answer is here. No matter the need, Honeywell Sensing and Control (S&C) has the microstructure, pressure sensor solution. Our sensing element

The INFICON Standard Gauges,,, PSG510- S and, employ the most advanced digital technology available in themarketplace. The rugged stainless steel sensor cell and compact design qualifythem for use on semiconductor

Compact Vacuum Regulator Series ITV RoHS For single unit and single unit for manifold ITV Pressure range kpa Power supply voltage 4 VDC ±% to VDC How to Order N Cable connector N Without cable connector

Electro-Pneumatic Regulator/Electronic Vacuum Regulator Series Stepless control of air pressure proportional to an electrical signal // series are compatible with various input specifications, including

2 Inert Isolation PTFE 3-Way Solenoid Valve Series 1 The Series 1 diaphragm type valve has a low internal volume and rapid response time, which enables users to get readings quickly for their analysis.