INSTRUCTION MANUAL DIGIVAC Model 200 Pirani Digital Vacuum Gauge Revsion K13A YOU MUST READ THIS MANUAL BEFORE USE Readings from 1 – 2000 millitorr The DIGIVAC Company 105B Church Street Matawan NJ 07747 www.DIGIVAC.
CONTENTS 1.0 Description and Principle of Operation. 2.0 Construction. 3.0 Unpacking and Inspection. 4.0 Installation. 5.0 Operation. 6.0 Servicing and Calibration. 7.0 Notes on Calibration. 8.0 Understanding Microns, Torr, and Absolute Pressure. 9.0 Accessories and Modifications 10.0 Terms & Conditions Instruct/200 Pirani.
1.0 DESCRIPTION AND PRINCIPLE OF OPERATION. The Model 200 Pirani is a full featured vacuum instrument that is fast, accurate and rugged. This unit builds on the engineering philosophy that made the Model 200 our best selling vacuum instrument: simple is best and robust is a must. The model 200 Pirani employs a VRC Pirani tube instead of a Varian 531 gauge tube. The instrument features large, bright LEDs visible from across the room with a hard, vinyl clad metal enclosure.
Pirani gauge tubes must be installed in a thread-down orientation in a clean, dry vacuum system. While threading the gauge tube in to the manifold, the gauge tube cable should be disconnected to avoid damage. In this way, twisting of the cable and the octal socket on the tube is avoided. Care should be exercised to install the tubes in a dry part of the system.
If you purchased the Ethernet option, please refer to the model 200 Ethernet Addendum for initial setup. Your 200 Pirani should be set by default with the IP address 192.168.0.200. Surf over to http://192.168.0.200 (or whatever your IP address was set to) and say “yes” to security screens authorizing a DIGIVAC applet to run in your browser.
And then you should see a terminal window popup that you can execute all the commands in: Press carriage return or enter to submit the query or change the set point. Note that while the web terminal is open, the main 200 Pirani screen will not update. If at any time the web terminal or the main 200 Pirani applet window becomes unresponsive, close the browser (not just reloading the tab or closing the tab) and reconnect.
6.0 SERVICING - GAUGE TUBE CLEANING. In many cases, a gauge tube may become fouled with oil or other foreign matter. It is often possible to restore the functionality of contaminated probes with cleaning. If the contaminant is known, the tube should be filled with a fluid that is known to be a solvent to that contaminant. As an example, ether is often effective in removing residues of some oils. Commercial carburetor cleaners are very powerful solvents and are highly effective against some contaminants.
Microns are not really a measure of vacuum at all, but rather of absolute pressure. It will be recalled that the pressure of the atmosphere is 14.696 or approximately 14.7 pounds per square inch at sea level. This pressure is due to the weight of all of the air in the earth's atmosphere above any particular square inch. This 14.696 psi is equivalent to the pressure produced by a mercury column of approximately 29.92 inches high or .76 meters (about 3/4 of a yard) or 760 millimeters of mercury.
.0 ACCESSORIES AND MODIFICATIONS. The following are offered as accessory equipment or field-installed modifications. Padded shoulder strap Case with Velcro closure- For instruments that will be used in the field, particularly in cryogenic applications, a padded shoulder strap case is available. COMPATIBILITY WITH OTHER GAUGE TUBES. On special order, DIGIVAC Instruments can be provided to use with most other vacuum gauge tubes. AC and DC excitation are available.
.0 TERMS AND CONDITIONS . TERMS OF USE, LIMITED WARRANTY & LIABILITY WAIVER THE DIGIVAC COMPANY (“DIGIVAC”) offers all of its products with the following terms and conditions and notices as follows. By accepting and/or using a DIGIVAC product, you hereby acknowledge and agree to the following terms and conditions, and acceptance of these terms and conditions are a condition precedent to any purchase/sale agreement between you and DIGIVAC.
