VacuGuard User`s Manual - Pascal Technologies, Inc
Contents
1. No further adjustment of the instrument is necessary Begin by connecting the optional cable between your Televac type 2A thermocouple sensor and the modular cable port on the rear of the instrument The instrument cable port is labeled input Televac has supplied you with the mating connectors for the Setpoint and Analog Output REC OUT ports If you plan to use these features please wire the connectors to your external devices now Refer to Specifications section of this User s Guide for further information on these features We recommend a dedicated ground wire be connected between a known ground point in your facility and the ground screw designated with the universal ground symbol on the rear of the instrument Connect the supplied 115 VAC power cable to its port on the rear of the instrument There is no power switch The instrument will automatically power up Proceed to step 3 0 e C NCNO 4 mii EF uz REC 77 INPUT OUT Figure 1 Page 2 3 0 Checking Pressure and Adjusting Setpoints Reference to Figure 2 The instrument should now be measuring and diaplaying a pressure presuming the instrument is properly cabled to a functioning type 2A sensor and the pressure is within the sensor s range i e between 20 torr and 1 millitorr 20 000 microns and 1 micron The instrument is equipped with dual setpoints which are adjustable from the front panel To adjust the setpoint value Press the button lab2. Recommended Options and Spares section of this manual for details Procedure A Using Reference Standard to achieve a three point calibration Attach the Reference Standard to the end of the sensor cable in place of the 2A sensor and set the Reference Standard s selector to 0 Power the instrument from a 110VAC source Press and simultaneously hold both SP 1 and SP 2 buttons to enable adjustment While holding the SP buttons press the Up or Down buttons until a 0 reading is achieved Repeat this procedure using the 100 and 1000 millitorr selector positions on the Reference Standard Procedure B Using a 2A sensor to achieve a two point calibration With the MV2A powered up and attached to a 2A sensor reduce the vacuum system s pressure to at least one decade of pressure less than the sensor will read i e 0 1 millitorr Press and simultaneously hold both SP 1 and SP 2 buttons to enable adjustment While holding the SP buttons press the Up or Down buttons until a 0 reading is achieved Increase the vacuum system pressure to 800 millitorr Press and simultaneously hold both SP 1 and SP 2 buttons to enable adjustment While holding the SP buttons press the Up or Down buttons until a 800 is displayed Page 4 6 0 Useful Information 6 1 Vacuum Terminology and The MVZA Atmospheric pressure is defined at 760 torr at sea level when the barometric pressure is 29 92 Hg One Torr is 1 760 of a
3. TELEVAG MV2A User s Guide TELEVAC UP DOWN spe SP Div OF THE FREDERICKS co Televac The Finest In Vacuum Instrumentation Instrument Part No 2 7900 071 Some Thoughts From Televac Thank you for purchasing the MV2A Thermocouple Vacuum Instrument The MV2A is a unique and rugged power supply controller and display device for Televac type 2A thermocouple vacuum sensors It is easy to use and will provide you with many years of trouble free service This manual is designed to help MV2A users gain the greatest benefit from the instrument s use Please review the manual before attempting to operate the instrument 1 0 Unpacking amp Inspection Inventory the Contents Compare the list of items from your original purchase documents against the items listed on our shipping documents Compare these against the actual contents of the shipping container Report any differences to Televac Damage In the unlikely event that the shipping container was damaged in transit carefully inspect the contents for damage If the MV2A Instrument or any of its accessories were damaged in transit contact the freight carrier and tell them you wish to make a damage claim Contact Televac for further instructions on replacement of damaged materials If the shipment arrived in good order proceed to step 2 0 2 0 Wiring and Initial Start Up Reference to figure 1 Your MV2A was factory tested calibrated and met Televac s high quality standards
4. eled SP 1 The previously stored setpoint will be displayed Continue pressing SP 1 and now press either the Up or Down button to increase or decrease the value of the setpoint until the desired value is displayed Releasing the SP 1 button will overwrite the old value and store the new value in memory Repeat this process with the SP 2 button if a second setpoint is needed TELEVAL X OF THE FREDESICEB x uP DOWN Setpoint Selector Buttons Setpoint Value Adjustment Buttons Figure 2 Note Factory settings can be restored by pressing the SP 1 SP 2 Up and Down buttons simultaneously The setpoints will be established at 100 and 200 millitorr 4 0 Analog Output A 0 5VDC analog output port is provided at the rear of the instrument The output voltage is linear and proportional to pressure between 1000 and O millitorr per the following table MILLITORR VOLTAGE MILLITORR VOLTAGE 0 0 000 200 1 000 1 0 005 300 1 500 5 0 025 400 2 000 10 0 050 500 2 500 20 0 100 600 3 000 30 0 150 700 3 500 40 0 200 800 4 000 50 0 250 900 4 500 60 0 300 1000 5 000 70 0 350 80 0 400 90 0 450 100 0 500 Page 3 5 0 User Calibration of the MV2A Under normal operating conditions the user may wish to calibrate the MV2A once or twice per year This procedure simple to perform and two optional methods are given One method requires the use of a Televac Reference Standard 2A Simulator while the other uses a 2A sensor Refer to
5. g us Our main telephone number is 215 938 4444 and our normal hours are 8 00am to 5 00pm eastern time Our fax number is 215 947 7464 Our main email address is vacuum televac com You can locate the name and contact information of your local Televac representative through our website www televac com Page 5 7 0 Troubleshooting 7 1 No Digital Display L1 Power Cable is loose or missing Reconnect L1 Fuse blown Remove 4 screws of rear of instrument case to access and replace fuse 7 2 Improper Reading Note Most improper readings are the result of a contaminated sensor If in doubt measure a sensor or reference standard that is known to be working properly L1 Cable not properly matched to instrument Calibration may be necessary L1 Thermocouple sensor may be defective Test a known good thermocouple sensor or reference standard 7 3 Setpoint does not engage L1 Make sure that adjustment is at the poper level Adjust if needed per step 3 0 L1 Connector or cable is disconnected Reconnect L1 External device is defective Repair or replace 8 0 Specifications Power Input 115VAC 60Hz single phase Both input legs fused with Buss GMA fuses Display Red LED 3 5 digits Sensor Input Televac 2A or 2A Miniature Sensor Cable Interface RJ modular jack Display Output Torr or Millitorr as appropriate to pressure Setpoint Relays Dual SPDT rated at 5A 240VAC Relays are energized below setpoint value Analog Output Li
6. near 0 5VDC between 0 and 1000 millitorrr Size 1 8 DIN enclosure Maximum overall dim 5 55 L x 3 78 W x 1 88 H Weight 2 44 pounds including mounting hardware Recommended Options amp Spares 2A sensor forged brass body with 1 8 NPT connection p n 2 2100 10 2A sensor stainless steel body with 1 8 NPT connection p n 2 2126 001 VacuMini 2A miniature sensor p n 2 2100 102 NASA 2A miniature sensor p n 2 2100 31 2A miniature sensor cable used for VacuMini or NASA 2A p n 2 9800 082 2A sensor cable 3 length p n 2 9800 076 2A sensor cable 10 length p n 2 9800 077 2A sensor cable 20 length p n 2 9800 078 2A sensor cable 35 length p n 2 9800 079 2A sensor cable 50 length p n 2 9800 080 Televac 2A reference standard 1000 100 and 0 millitorr p n 2 2100 242 consult factory for other sensor flange connection types A Division of The Fredericks Company 2400 Philmont Avenue Huntingdon Valley PA 19006 0067 Phone 215 947 2500 Fax 215 947 7464 www televac com
7. tmospheric pressure One Torr can also be expressed as 1000 Millitorr or 1000 Microns One Millitorr or one Micron is 1 760 000 of atmospheric pressure The thermocouple sensors that are used with your MV2A instrument are designed to measure a small portion of that wide band of reduced pressure that extends from atmospheric pressure to a region known as very ultrahigh vacuum 14107 torr This total spectrum of measurable vacuum contains about 18 decades of pressure For example The Televac 2A series sensor measures from 20 torr to 1 millitorr Five decades Please realize that the smaller the dynamic range of the sensor the less visibility the user has to pressure changes 6 2 Practical issues to consider with thermocouple sensors y The most common failure mechanism is gross contamination If there is a probable risk of contamination by particulate or liquids we recommend the use of one of our sensor filters y Vertical orientation with electrical pins up where practical is usually preferred to inverted or horizontal orientation y If your application requires a sensor that s immune to shock vibration excessive heat and or severe weather conditions contact us for information on our family of Miniature 2A sensors y It is usually useful to have a known reference to periodically check the instrument and or sensor performance Refer to the informationon the next page about our inexpensive reference standards 6 3 Contactin
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