Model LEDBAR Instruction Manual
Contents
1. h on h on h on h on h on h on off off off off off off off off off off off of off off off off off off 12 0 0800 12 h on h on h on h on h on h on h on h on h on h on h on off off off off off off of off of off of off off of off off off 13 0 0900 13 h on h on h on h on h on h on h on h on h on h on h on h on off off off of off off off of of of off of off off off off 14 0 1000 14 h on h on h on h on h on h on h on h on h on h on h on h on h on off off off of of of of off of of off off off off off 15 0 2000 15 h on h on h on h on h on h on h on h on h on h on h on h on h on h on of of of of off of of off of off off off off off 16 0 3000 16 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off of off off of off off off off off off off off 17 0 4000 17 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off of off off of of off off off off off off 18 0 5000 18 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on of off off of of off off off off off off 19 0 6000 19 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off of off off of off off off off off 20 0 7000 20 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off off off of off off off off off 21 0 8000 21 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off off off off of off off off 22 0 9000 22 h o2. 01H set the vacuum level to a steady 1980 millitorr and slowly turn the potentiometer on the right until the DIGIVAC gauge reads 1980 millitorr b For the 201V set the vacuum level to Atmosphere approximately 760 Torr and slowly turn the potentiometer on the right until the DIGIVAC gauge reads 760 Torr being careful not to over span c If you adjust the span recheck the zero then the span and the zero one last time 7 0 NOTES ON CALIBRATION The DIGIVAC is calibrated in nitrogen which has thermal properties virtually identical to air If you are using a thermocouple vacuum gauge other gasses will affect the readings by an amount proportional to the thermal conductivity of the gases In most cases the gases present in a vacuum system will be air nitrogen or oxygen and no appreciable errors will occur Certain other gases however have thermal conductivity significantly greater than air and will cause the instrument to read higher than the actual amount of pressure Examples of such gasses are water vapor fluorocarbon refrigerants and acetone Conversely other gasses have thermal conductivity significantly lower than air and will cause the instrument to read lower than actual pressure Examples of such gasses include helium oxygen and to a lesser extent CO2 When interpreting readings using gasses other than air it should be borne in mind that the DIGIVAC reads Torr which is a measure of absolute pressure that is the opposite
3. 8 10 0 Attachments and lllustrations LEDs L R Pressure LE lt State 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 2 1 1 0 0005 off off off off off off off off of off off off off off off off off off off of off off off off off off off off 1 0 0010 1 2 0 0020 2 h on off off off off off off off off off off off of of off of off of off off off off off off off off off off 3 0 0030 3 h on h on off off off off off off off off off off of of of of of off of off off off off off off off off off 4 0 0050 4 h on h on h on of off off off off off off off off off off of of of of of of off of off off off off off off 5 0 0070 5 h on h on h on h on off off off of of off of of off of of of of of of off of of off off off off off off 6 0 0100 6 h on h on h on h on h on off off off off of of of of off off of off of of off of off off of off off off off 7 0 0100 7 h on h on h on h on h on h on off off of off off off off off of of of of off off off of of off off off off off 8 0 0400 8 h on h on h on h on h on h on h on off off off off of of of of off of of off of off off of off off off off off 9 0 0500 9 h on h on h on h on h on h on h on h on off off off of of off of of of of of of of off of off off off off off 10 0 0600 10 h on h on h on h on h on h on h on h on h on off off off off of off of of off of of of of off off off off off off 11 0 0700 11 h on h on h on h on
4. DigiVac Precise Practical Personal INSTRUCTION MANUAL DIGIVAC LightBarVac Digital Vacuum Gauge with Progressive LED visual indication YOU MUST READ THIS MANUAL BEFORE USE millitorr 10 50 100 1000 ATM The DIGIVAC Company 105B Church Street Matawan NJ 07747 www DIGIVAC com 732 765 0900 732 765 1800 FAX 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 Attachments and Illustrations 11 0 Terms amp Conditions DIGIVAC LightBarVac Instruction Manual Page 2 1 0 DESCRIPTION AND PRINCIPLE OF OPERATION The DIGIVAC LightBarVac is a visual digital vacuum control instrument that is designed to be extremely easy to use This device can simplify process work by giving a progressive visual indication of vacuum pressure that is easy to remember from across the room It also features Cylon set points that make it very obvious when a particular vacuum level is reached If in doubt about what gauge sensor you have consult the DIGIVAC packing list that came with your instrument for positive identification Consult the DIGIVAC website www DIGIVAC com for information about other DIGIVAC va
5. Y OTHER WARRANTY EXPRESSED OR IMPLIED LIMITATION OF LIABILITY You agree and acknowledge DIGIVAC shall have no liability to you whatsoever for any direct indirect punitive incidental special consequential damages arising out of or connected with the use or misuse of its products In particular given the nature of DIGIVAC products you agree and acknowledge under no circumstances whatsoever shall DIGIVAC be liable to you for any consequential damages for damage to any non DIGIVAC product or service arising from the failure use or misuse of a DIGIVAC product including but not limited to any vacuum system engine vehicle factory or the like In the event a court of law with proper jurisdiction finds DIGIVAC liable to you for any purpose you agree and acknowledge DIGIVAC s maximum liability shall not exceed the purchase price of one unit of product giving rise to such liability or 250 00 whichever is greater ENTIRE OBLIGATION These terms and conditions express the entire obligation of DIGIVAC with respect to its products If any part of these terms and conditions are deemed void invalid unenforceable or illegal including but not limited to the warranty disclaimers liability disclaimers and liability limitations set forth above then the unenforceable clause or sentence may be disregarded with the remainder of these terms and conditions valid and enforced In the event the unenforceable clause or sentence leaves a void in these terms
6. amination of the system may result 6 1 FACTORY REPAIR AND CALIBRATION The vacuum gauge assembly is designed to provide years of trouble free service and the liberal internal use of plug in components make it easily repairable No field servicing of the unit is recommended other than replacement of the gauge tube but factory servicing and calibration are available at a nominal cost and turn around times of 24 hours are typical 6 2 FIELD CALIBRATION Each DIGIVAC vacuum gauge controller is calibrated to the particular vacuum gauge sensor that is shipped with the unit While changing the gauge tube is possible it will result in a slightly different reading as all gauge tubes are not created equal Although it is preferable that all calibration be performed at DIGIVAC field calibration can be accomplished DIGIVAC LightBarVac Instruction Manual Page 5 Before re calibrating the instrument it should be ascertained that the instrument is in fact incorrect In many cases the problem will be with a tube that is fouled or a system that is operating improperly It is recommended that a spare tube be kept on hand and stored in a clean dry place Then in cases of suspect readings the tube should be changed before proceeding further If adjustments are to be made for thermocouple vacuum gauges proceed as follows A Remove the Instrument from the panel B Remove the front panel cover of the instrument and locate the two calibration potent
7. and conditions a provision closely matching the intent of the unenforceable provision should be deemed inherent within these terms and conditions slightly modified to render such provision valid and enforceable GENERAL These terms and conditions are governed by the laws of the State of New Jersey USA You hereby consent to the exclusive jurisdiction and venue of the Courts of New Jersey in all disputes arising out of or relating to the use of this product Use of this product is unauthorized in any jurisdiction that does not give effect to all provisions of these terms and conditions MODIFICATION OF TERMS AND CONDITIONS DIGIVAC reserves the right to change the terms conditions and notices under which their products are offered DIGIVAC LightBarVac Instruction Manual Page 11
8. cable ordered an AC power adapter and an instruction manual In the event of a loss during shipment a claim should immediately be made to the common carrier or the postal service as applicable The DIGIVAC warranty pertains only to the instrument and does not cover losses in shipping Each LightBarVac should come with o User Manual this document o Display controller black box o Power supply o Sensor and cable 4 0 INSTALLATION The instrument should be located in a clean dry environment for best results DIGIVAC LightBarVac Instruction Manual Page 3 Thermocouple 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 Since the instrument works on the principle of temperature rise the probes will not work if they become filled with a liquid such as vacuum or diffusion pump oil The gauge tube should be protected against oil and other contaminants by installing it in such a way to protect it A good practice is to mount the gauge tube in the most vertically distant place from oil and other contaminants as applicable The gauge tube should be mounted in the most stable pressure region of the vessel to be measured For example it would be bet
9. cuum controllers and gauges The DIGIVAC LightBarVac configured with a Varian 531 Thermocouple gauge tube senses vacuum by measuring the temperature rise of an electrically heated thermocouple exposed to a vacuum As vacuum increases or more correctly as absolute pressure decreases fewer and fewer molecules of gas are available to cool the thermocouple With fewer molecules the air temperature rises and the thermocouple gauge thus senses the vacuum A precision reference inside the DIGIVAC in conjunction with an integrated circuit amplifier controls the electrical excitation of the sensor filament 2 0 CONSTRUCTION The DIGIVAC consists of the indicating and controlling instrument the sensor configured the sensor cable the output interfaces and an international AC power adapter The instrument is housed in a rugged free standing vinyl clad metal enclosure The gauge tube houses the various thermocouple sensing heating and compensating elements and terminates in an octal connector On this model the connector wiring terminates at the instrument with a 6 position RJ24 Regulating circuitry in the DIGIVAC provides constant current for gauge tube excitation and thus compensates for resistance in the probe leads 3 0 UNPACKING AND INSPECTION After the instrument is received it should be carefully unpacked and inspected for damage during shipment and for completeness The package should contain as a minimum the instrument the sensor and
10. icates the current pressure When the left most LED blinks the instrument is indicating below 1 millitorr The DigiVac LightBarVac has 1 visual Cylon set point that can be used to visually indicate a vacuum pressure of interest To set this set point 1 Attain vacuum level that you would like the set 2 Push recessed switch in the back of the unit labeled set point for 1 second a The set point is now entered When a vacuum pressure at or below the set point is attained the LEDs to the left of the current pressure LED will Cylon back and forth think of the red light movement of the battle star galactic Cylon robots or the red light movement in the Knight rider car b To disable set points set for any pressure for over 400000 microns 400 Torr or Atmosphere 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 After cleaning with solvents the gauge tube should be completely dried or flushed with a volatile solvent to assure that it is dry prior to re installing it If this is not done cont
11. iometers The Zero potentiometer is to the right as you look at the LED Display the ATM or span adjust is to the left closest to the outside of the board C Precalibrate a Set the device on a table top with the tube plugged in b Place a voltmeter lead on ground center pin below display c Place the positive voltmeter lead on the lower side of the beige capacitor on the top of the board to the left of the display d Adjust the Zero POT to read 1 77 Volts e Place the Positive voltmeter lead in the via that is located on the left side of the board towards the edge f Adjust the span pot so the voltage is 1 185 Volts D Operate the vacuum system at the lowest attainable pressure and allow the system and the gauge tube to stabilize for several minutes Factory zero setting is done at a pressure of 1 millitorr 1 micron or less E Adjust the zero setting potentiometer so the unit reads zero Make sure not to under span Allow the measurement standard to rise to 1 millitorr and make sure the gauge reading also reads 1 millitorr Note the POTS are counter intuitive clockwise makes the value go down and vice versa and are very sensitive F Check the operation of the gauge at other pressures Normally adjustment of the zero will not be interactive with the readings of the instrument at higher pressures G The ATM adjustment is normally not necessary If necessary adjust the span with the ATM potentiometer a For the 2
12. n h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off off off of off off off 23 1 0000 23 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off off off off off off 24 2 0000 24 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on of off off off off 25 5 0000 25 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off off off off 26 10 0000 26 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off off off 27 20 0000 27 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off off 28 200 0000 28 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on off 29 400 0000 29 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on 30 760 0000 30 h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on h on DIGIVAC LightBarVac Instruction Manual Page 9 Below is the typical response of a thermocouple vacuum gauge tube DIGIVAC gauges which use pre
13. o protect and insure accuracy of the internal circuitry 5 0 OPERATION After installation the DIGIVAC is ready for immediate operation The unit will normally provide accurate readings immediately when used with a thermocouple gauge however occasionally a gauge tube will have absorbed material during storage and may require as much as 24 hours of operation before accurate readings are attained It is recommended that the DIGIVAC be energized continuously during vacuum system operation In this way the hot filament will not allow contaminants to condense Only connect and disconnect cables with the power to the unit unplugged Make connection to sensor with the power disconnected NEVER DISCONNECT SENSOR WIRES WHILE UNIT IS POWERED UP DIGIVAC LightBarVac Instruction Manual Page 4 In cases where the system has contaminants as is often the case with metalizing and coating equipment it is often effective to isolate the gauge tube with a solenoid or manual valve during periods when contamination is most active millitorr 10 50 100 1000 ATM a0 The operation of the LightBarVac is simple simply plumb the sensor in connect the cables and start reading Vacuum When exposed to atmospheric pressure all 30 LEDs will be lit As the vacuum is applied the number of LEDs will reduce indicating the current pressure The right most green LED ind
14. of vacuum Thus a lower numerical reading actually is a higher level of vacuum For more information refer to section 8 0 Note that isolated transducers like capacitance manometers are independent of gas type DIGIVAC LightBarVac Instruction Manual Page 6 8 0 UNDERSTANDING TORR The DIGIVAC and many similar instruments are calibrated in microns or millitorr It is appropriate to discuss what microns are and to relate microns to other measures of pressure and vacuum 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 Atmospheric pressure varies greatly with altitude It decreases approximately 1 inch of mercury per thousand feet of altitude It also varies widely with local weather conditions Variations of one half inch in a single day are common The word vacuum means pressure lower than atmospheric or suction but in describing negative pressure the atmosphere is only a satisfactory reference if we are dealing with values of vacuum down to about 27 inches of mercury Below that it is much more usef
15. onditions as set forth in its User Manual or as indicated otherwise by DIGIVAC Any use of the DIGIVAC Product for any purpose or under any conditions other than those specified shall render any limited warranty void and shall expressly invalidate any liability of DIGIVAC for damages as a result of such misuse USER LIMITATION You may not modify copy distribute transmit display perform reproduce publish license create derivative works from transfer or sell any information software products or services obtained from or created by DIGIVAC to any third party without the express written consent of DIGIVAC to do otherwise Any violation of this provision shall give rise to an indemnification of DIGIVAC by you for any third party claims arising out of such violation THIRTY 30 DAY LIMITED WARRANTY All DIGIVAC products are warranted against any manufactured defect for a period of thirty 30 days from date of purchase unless such product is a custom work for you and not a standard DIGIVAC product Any product qualifying as a custom work shall not be warranted against any defects for any purpose and your acceptance of such custom work shall relieve DIGIVAC of any liability for any purpose WITH THE EXCEPTION OF THE LIMITED WARRRANTY ABOVE YOU AGREE ANY DIGIVAC PRODUCT IS PROVIDED AS IS EXCLUSIVE OF ANY WARRANTY INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE NON INFRINGEMENT OR AN
16. ssure transducers are linear Milli Milli Torr volts 0 10 Digivac 500 Series Gauge Tubes 5 9 57 10 9 32 20 8 81 25 8 54 35 8 11 50 7 46 19 6 63 100 5 96 150 5 04 200 4 38 300 3 56 500 2 2 750 2 24 1000 1 97 1500 1 71 1900 1 59 im SASSRUSRHSEH0R008 000085 Pade ed sees sil GL ile tel EO Papell lie A foes E eDiets ILE Ha CECEC EEE EEE EEE Output Millivolts ee PET TLS TI OT TOT SIPS TST eat ey E Va Tt PET TT TTT TT TTT TT TT TE TT TET EE EE et PET TT TTT TTT Te TTT TT TT TT TE EE ee TT See ee A TE eee TT TT ret ha oI ETT A eT SES el i Fea isles elle Rae Mo tale esl ese E Me age fl PITT TTT TTT TTT TT TT TT TT TET ee Pere TT aaa spine Joa Ale Jesh 2 ee e ee PET TT TTT TT TTT TT TE TT et PET TT TTT TT TTT TT TT TT TET TT 50 100 200 1000 1900 Pressure Millitorr DIGIVAC LightBarVac Instruction Manual Page 10 11 0 TERMS AND CONDITIONS TERMS OF USE LIMITED WARRANTY amp 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 EXCLUSIVE OBLIGATION The DIGIVAC product you are purchasing has been designed for a specific use within a set of suitable operating c
17. ter to install the gauge tube on a tank rather than on the pipe that is directly connected to a vacuum pump In the event of contamination see section 6 0 for gauge tube cleaning instructions lf the gauge is used in a Neon sign processing facility the following is recommended to protect the gauge from damage from bombarding e The gauge tube should be isolated from the system with a stopcock The stopcock should be closed when bombarding e There should be at least 2 feet of tubing between the electrode and the DIGIVAC For best results the tubing should be metal e In extreme cases the gauge can be absolutely protected by installing a normally open solenoid valve between the gauge tube and the system The solenoid valve coil should be in parallel with the bombarding transformer In this way the solenoid will be closed and the gauge tube will be positively protected whenever bombarding is done e fa gauge is damaged by bombarding it can generally be brought back to operating condition by replacing the Op amp which controls the gauge tube current Consult DIGIVAC Set Point Sensor Power OFF The set point recessed button is used to set the set point The sensor wire plugs into the jack labeled sensor The power adapter plug plugs into the jack labeled Power Although it is not necessary you may turn the unit off Please use the supplied 5V AC adapter with your Instrument This adapter provides clean short protected power t
18. ul to talk in terms of absolute pressure starting from absolute zero The DIGIVAC and all similar instruments do just this One TORR a commonly used unit is an absolute pressure of one millimeter of mercury A millitorr is equal to one thousandth of a TORR A MICRON is the same as a millitorr The full scale reading of a DIGIVAC is 1999 microns and is equivalent to 1 999 TORR of approximately 2 760 of atmospheric pressure This is less than 1 inches of mercury and less than 05 PSI DIGIVAC LightBarVac Instruction Manual Page 7 9 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 This case holds a DIGIVAC 100tc battery powered gauge in the optimal reading position The operator can open the Velcro cover pull out the gauge tube cable plug it into the tube on the equipment and see the reading lt was developed to assist in field service of cryogenic tank farms and vacuum jacketed piping 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 Gauges have been provided for Hastings Varian Thermionics Veeco VRC and Fredericks gauge tubes DIGIVAC LightBarVac Instruction Manual Page
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