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DigiVac Bullseye Precision Gauge Pirani, User Manual

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DigiVac Bullseye Precision Gauge Pirani User Manual Download Page 10

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1 0 5 B   C h u r c h   S t ,   M a t a w a n ,   N J   0 7 7 4 7                                                                        
7 3 2 - 7 6 5 - 0 9 0 0

       

s a l e s @ d i g i v a c . c o m

     

w w w . d i g i v a c . c o m                                                                                                

Copyright 2015, DigiVac, Inc., All rights reserved.

 

 

 

Numeric display with the “High Resolution” format

 

 
 

Large number display with the “scientific” format

 

The numeric display shows the currently configured units; in these examples the vacuum pressure units 

are “microns” or “torr”.

 

 
In any display mode, the UP and DOWN buttons turn the backlight on and off (respectively), the SEL 
button enters the configuration menu, and the ENT button turns the gauge on or off.  
 
The battery indicator shown at full strength 

Summary of Contents for Bullseye Precision Gauge Pirani

Page 1: ......

Page 2: ...1 0 5 B C h u r c h S t M a t a w a n N J 0 7 7 4 7 7 3 2 7 6 5 0 9 0 0 s a l e s d i g i v a c c o m w w w d i g i v a c c o m Copyright 2015 DigiVac Inc All rights reserved ...

Page 3: ...utes to 2 hours Rugged design for field use Dimensions 6 2 x 3 7 x 1 3 Only requires 4 AA or Micro B USB Range of 1 millitorr to 50 Torr Accuracy from 50 millitorr 30 Torr 7 Calibration points of 5mt 50mt 1T and 30T Sensor resolution of 2 5mt display resolution of 0 1mt Number of Units 12 microns millitorr Torr mbar Bar kPa pascals PSIA mmHg inHg mmH2O inH2O Scientific notation or decimal display ...

Page 4: ...rger Quick Start guide or this user manual Remove protective boot Install batteries or attach a Micro B USB press the POWER button and verify that the display lights up Plumb Pirani vacuum sensor into the system to be measured taking care to differentiate between the threaded end and the end connecting the sensor to the cable Thread sensor cable into sensor cable connector is keyed Power on the de...

Page 5: ...5 1 0 5 B C h u r c h S t M a t a w a n N J 0 7 7 4 7 7 3 2 7 6 5 0 9 0 0 s a l e s d i g i v a c c o m w w w d i g i v a c c o m Copyright 2015 DigiVac Inc All rights reserved ...

Page 6: ...measure the heat loss of the chip resistor which is an indirect indication of pressure Most DigiVac instruments incorporate a more traditional thermocouple sensor using heated dissimilar conductors that make contact and create a temperature differential which in turn produces a voltage later translated into a vacuum reading Inexpensive Largely interchangeable Measures a wide range of vacuum Suscep...

Page 7: ... Low Resolution High Resolution and Scientific Notation Display modes are selected from the display menu Display and numeric formats are selected from the Setting option Display The SEL button enters and traverses the Settings menu The numeric display shows the currently configured units In these examples the vacuum pressure units are microns or torr In any display mode the UP and DOWN buttons tur...

Page 8: ...wn data In this mode the pump down graph is shown with a linear pressure scale that is fit to the pressure range of the data set The height of the graph display is the pressure range of the data set in a linear scale not log The top left figure is the maximum value in this range and the bottom left figure is the minimum value in this range Sometimes this visualization is not useful showing noise T...

Page 9: ...but may result in a noisier reading Low Resolution The Low Resolution format has two digits of precision For example an internal vacuum value of 1234 microns μm Hg would be displayed as 1 2 torr in the Low Resolution numeric format with torr units This number format also gives a filtered number depending on the accuracy of the gauge in the pressure range of measurement which results in a quieter g...

Page 10: ... Resolution format Large number display with the scientific format The numeric display shows the currently configured units in these examples the vacuum pressure units are microns or torr In any display mode the UP and DOWN buttons turn the backlight on and off respectively the SEL button enters the configuration menu and the ENT button turns the gauge on or off The battery indicator shown at full...

Page 11: ...hanges based on the current level of pressure The numeric display shows when the vacuum sensor is disconnected failed or when an over range condition exists pressure above 50 Torr The numeric display shows OVERRANGE when the vacuum sensor tube is disconnected failed or when an over range condition exists pressure above 50 Torr The bar graph visualizes the current sensor reading with a 6 stage step...

Page 12: ...display is the pressure range of the data set in a linear scale not log The top left figure is the maximum value in this range and the bottom left figure is the minimum value in this range The top right figure is the current or most recent value in the instrument Sometimes this visualization is not useful showing noise This noise comes from the instrument s process of measurement as well as the va...

Page 13: ...ith cleaning If the contaminant is known the sensor 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...

Page 14: ... Your vacuum instrument should give you many years of trouble free service There are no regularly scheduled maintenance intervals If consistent accuracy is required it is recommended that the gauge tube cable and power supply be returned for a yearly calibration check The instrument is calibrated in nitrogen which has thermal properties virtually identical to air Other gasses will affect the readi...

Page 15: ...ontroller s analog to digital converter and is a useful diagnostic The calibration points are 30 Torr the Atmospheric pressure calibration number 1 Torr Mid The middle calibration number This number literally represents the calibration curve pivot point between the high and low variables 50mT Vac The vacuum or low pressure calibration number 5mT The lowest pressure calibration number These numbers...

Page 16: ...ize the vacuum system to exactly 30 Torr then press the up and down buttons simultaneously so the unit reads exactly 30 Torr or 30000 0 Press the SEL button once more so the screen reads Press up down to Store then press up and down button simultaneously Screen will flash black and calibration offsets will be saved Pump manifold down to 1 micron and check unit reading at different points while slo...

Page 17: ...st This is done by pressing the arrow button and observing the ATM MID and VAC will be capitalized when selected Press up and down buttons simultaneously to zero out the offsets Pump manifold down to 1 micron and check unit reading at different points while slowly decreasing pressure to ensure successful calibration At pressures above 50 Torr the unit may display the text Overrange this is typical...

Page 18: ...s 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 useful to talk in terms of absolute pressure starting from absolute zero The Bullseye Pirani and all similar instruments do just this One Torr a commonly used unit is an...

Page 19: ...19 1 0 5 B C h u r c h S t M a t a w a n N J 0 7 7 4 7 7 3 2 7 6 5 0 9 0 0 s a l e s d i g i v a c c o m w w w d i g i v a c c o m Copyright 2015 DigiVac Inc All rights reserved ...

Page 20: ...20 1 0 5 B C h u r c h S t M a t a w a n N J 0 7 7 4 7 7 3 2 7 6 5 0 9 0 0 s a l e s d i g i v a c c o m w w w d i g i v a c c o m Copyright 2015 DigiVac Inc All rights reserved ...

Page 21: ...on Torr Inches of Hg kPa Inches of H20 millitorr mbar Pa PSIA mm of Hg bar and mm of H2O Calibrated under actual vacuum against a NIST standard Patent Pending vacuum graphing displays vacuum and time data Visual graphing right on the display that identifies current system status Vacuum Analytics to quickly identify vacuum pressure trends Graphical display for quick determination of vacuum level Li...

Page 22: ...HANTABILITY FITNESS FOR A PARTICULAR PURPOSE NON INFRINGEMENT OR ANY 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...

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