DigiVac Bullseye Piezo User manual

Bullseye Piezo User Manual
Software Version K19L16
YOU MUST READ THIS
MANUAL BEFORE USE

1020 C a m p u s D r i v e W e s t , M o r g a n v i l l e , N J 0 7 7 51
732-765-0900 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 2020, DigiVac, Inc., All rights reserved.
TABLE OF CONTENTS
Section 1: OVERVIEW...........................…………………………………………………………………………...3
Section 2: QUICK START GUIDE ..........................…………………………………………………...……….4
Section 3: MENU SETTINGS FLOWCHART……………………………………..……….5
Section 4: WHY PIezo?................................................................... ................….…………………….......6
Section 5: DISPLAY OPTIONS…………………………………………………………... ......................... …...7
Section 6: service and maintenance……………………………………………..............................…...11
Section 7: Accuracy……………………………………………………………......................14
Section 8: Specifications………………………………………………………...................14
Section 9: Units of Measurement…………..………………..………………................15
Section 10: options.……………………………………………………………………..........16
Section11:bluetooth connectivity…………………………………….……………17
Section 12: terms and conditions………………………………………….…………18

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Section 1: Overview
The Bullseye Precision Gauge Piezo was developed to make vacuum measurement easy, useful and
intuitive. The Bullseye Piezo is a rugged portable vacuum instrument that is sensitive and highly
accurate. It was designed to suit the demands of field use. Its main features include a graphical LCD
display with a white backlight for showing large numerical fonts and digital graphics to show line
graphs and time horizons of data from 2 minutes to 2 hours. This graphical display of vacuum
pressure makes understanding system trends easy by showing points of inflection and small changes
in pressure with sub second resolution.
Portable
•Rugged design for field or laboratory use
•Dimensions: 6.2” x 3.7” x 1.3”
•Only requires 4 AA alkaline or Micro-B USB to Power
Precise
•Range of 1 to 775 Torr, -29.92 to 0.59 inches Hg, and mbar
•+/- 2 Torr, +/- 0.08 inches Hg Accuracy
•Numerical graphing display
•Resolution of +/- 0.1 Torr, +/- 0.01 inches Hg
•12 Units: microns, millitorr, Torr, mbar, Bar, kPa, pascals, PSIA, mmHg, inHg, mmH2O, inH2O
Reliable
•Isolated sensor –Low risk of sensor contamination
•Battery life of 2800mah/25ma, or 127 hours ~ 5 days (for longer power needs use Micro-B
USB)
•Vacuum Interface of ⅛” NPT male or PTFE hose barb, KF/NW adaptable
•CE & RoHS compliant
•Simple, easy-to-use design
Features
•On/Off soft switch
•LCD graphical, white backlight, sunlight readable
•Large numerical font
•Digital graphics to display line graphs and time horizons of 2 minutes and 2 hours
•7-foot sensor cable length
•Sensor electrical interface: M12
•Magnet

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Section 2: Quick Start for Bullseye Precision Gauge Piezo
While this vacuum instrument has many features, it is very simple to use. Start by unpacking the unit
to verify you've received everything you've ordered.
Packing List
•Vacuum instrument with white backlight and black rubber boot
•Attached: 7' sensor cable with keyed connector designed to thread directly into the sensor
•Piezo vacuum sensor with 1/8” NPT fitted to 5/16” hose barb
•Quick Start guide or (this) user manual
Setting Up the Bullseye Piezo
1. Power
•Your gauge comes with 4 Pre-installed AA batteries
•Alternatively, you can power by attaching a Micro-B USB power cable
•To change Batteries:
◦Remove protective boot
◦Remove the battery cover and install 4 AA batteries then replace the battery cover and
protective boot
2. Plumb into system
•Plumb the Piezo 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
•Attach the sensor cable onto the sensor (cable connector is keyed)
3. Get ready to read vacuum
•Power on the device by pressing the PWR/EXIT button. It will take about 5 seconds to fully
power up and for the reading to settle.
•If need be, turn on the backlight. The backlight does not affect gauge reading or accuracy.
•Read vacuum!

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Feel free to explore the latest copy of this manual at www.digivac.com for all the features that
make this a truly useful tool.
Section 3: Menu Settings Flowchart

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Section 4: Why Piezo?
The Bullseye Precision Gauge Piezo incorporates an isolated Piezo resistive sensor (. A piezo resistive
sensor is effectively a silicon strain gauge. When the pressure is placed upon the silicon, the
resistance of a MEMS measurement resistor changes which can be measured by the sensor
electronics. The sensor itself incorporates a wheatstone bridge that is very sensitive to absolute
pressure levels from 1 Torr = 1 mbar to 775 Torr = 1033 mbar.
Piezo resistive sensors are often referred by their full scale or maximum pressure that they measure.
For example, our 775i sensor has a maximum pressure sensitivity of 775 Torr or 15PSIA. There are
other piezo-resistive types of sensors that are sensitive in other pressure levels. Other pressure levels
that are common with piezo resistive sensors are 30 PSI, 100 PSI, 200 PSI and 1000 PSI.
MEASURE BOTH PRESSURE AND ROUGH VACUUM
Our specialized piezo sensors allow you to easily measure both
Piezoresistive sensors have exceptional durability combined with low cost and better than 1% full scale
accuracy. They are chosen when a combination of durability, cost and accuracy are all important.
The accuracy of a piezo resistive sensors are typically given in % of full scale. For example, a 100 PSI
piezo sensor that is 1% accurate would have an accuracy of ± 0.01 * 100 PSI or ± 1 PSI. Note this
makes the % of reading accuracy very good near its full range of 100 PSI, but not so good near its base
pressure (lowest detectable pressure) of 1 PSI. The 775i sensor has an accuracy of ± 2 Torr, or 0.25%
of full scale. This would make its accuracy at 10 Torr ± 2/10 or ± 20% of reading at an actual pressure
of 10 Torr and at 200 Torr, ± 2/200 or 1% of reading.
TWO SENSOR OPTIONS FOR VERSATILITY
Choose from two different sensors based on your specific needs
Sensor Specifications
BPG Piezo 775i
BPG Piezo Vac2PSI
Sensor Method
Direct
Direct
Sensor Protection
Isolated
Isolated
Full Range
0.5 - 775 Torr
20 Torr - 85 PSIG
Most Accurate Range
2-775 Torr
50 Torr - 85PSI
Accuracy
+/- 2 Torr
+/- 15 Torr +/- 0.5 PSI
Target Application
Rotary Evaporation, Falling Film
Rotary Evaporation, Extraction

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The most important thing about accuracy is knowing what you need for your process. You should
choose the sensor that meets your needs. All sensors have tradeoffs of cost, type of reading
technology, and accuracy.
For example, a more accurate alternative to the Bullseye Piezo is a 1000 Torr capacitance manometer.
Some can be had at 0.15% of reading and are also isolated. However, they tend to be expensive, don’t
travel well (easily damaged), and require frequent maintenance to maintain that accuracy, especially
around 10 Torr. The Bullseye Precision Gauge Piezo was built from the ground up to be rugged and
thrive with field use.
ISOLATED SENSORS
For use in dirty environments or where corrosive gases are in use
The isolated part of the sensor is important. Isolated means that the sensing electronics are
separated and protected from the process gas pressure being measured.
When do you need an isolated sensor?
When measuring clean dry gasses, isolated doesn’t matter. Non-isolated sensors where the silicon die
of the piezo resistive encounters clean dry gasses (like air and nitrogen) will work. These electronics
can survive a lifetime exposed to clean dry air and even low humidity or an occasional splash of water
(when not energized).
Isolated is needed in corrosive environments: Corrosive gasses on the other hand will corrode
the silicon die and wires that make up a sensor just like the ocean would corrode a steel bolt thrown
into it. Over time the sensor will degrade and cease to operate. The isolation in the 775i and the
Vac2PSI sensor is achieved through a stainless-steel diaphragm that comes in contact with the media
to be measured, commonly called the wetted surface. These sensors will operate fine in diesel fuel,
gas, nitrogen, alcohol, or other corrosive environments.
The only time these sensors may degrade is when substances calcify on the stainless-steel diaphragm
preventing its movement. If the readings seem sluggish, check the sensor. When in doubt, use an
otoscope to look in the sensor to see if any foreign matter is stuck near the diaphragm. Wash out with
solvent, but do not poke the diaphragm. If the foreign matter is still obvious then it may be time to
replace the sensor. The sensors are easily replaced and have excellent interchangeability. Isolated
sensors are immune to damage from corrosive processes and materials.

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Section 5: Display Options
The Bullseye Piezo has two modes of display: numeric and graphical. The graphical display mode
features a line graph with time horizons of 2 minutes or 2 hours.
Display Options
The numeric display has three numeric formats: Low Resolution, High Resolution and Scientific
Notation.
Display modes are selected from the display menu 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 “mbar” 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 PWR/EXIT button turns the gauge on or off.
Display Bar Graph
The bar graph visualizes the current sensor reading with a 6-stage stepped bar.
The pump down graph plots time horizontally and log pressure vertically. The vertical
pressure scale is logarithmic, indicating order of magnitude from less than 1 Torr to

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atmosphere.
Display Line graph
The auto-scaling (or, auto-ranging) time graph is a microscope into the pump down 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. The top right figure is the current or most recent value in the instrument.
Please Note: Sometimes this visualization is not useful, showing noise. This noise comes from the
instrument’s process of measurement, as well as the vacuum system under measurement. In this
sense, the auto scaling graph is a data visualization microscope.
Useful Quick Tip: This visualization can show a very small climbing or descending trend that the
vacuum analysis algorithm has not declared as a leak or pumping.
High Resolution
The High-Resolution format has three digits of precision. For example, an internal vacuum value of
1234 millitorr (μm Hg) would be displayed as 1.23 Torr in the Precision numeric format with Torr units.
Additionally, this format gives the raw vacuum measurement data which may be useful for trending
but may result in a noisier reading.
Scientific
The scientific format has two digits of precision with a base ten exponent following conventional
usage. For example, an internal vacuum value of 52 Torr (mm Hg) would be displayed as 5.2 x E+1.
Current or most
recent pressure
Maximum &
Minimum value
is measured
range

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Display Large number
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 unit
is “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 PWR/EXIT button turns the gauge on or off.
The battery indicator shown at full strength
The numeric display shows when the vacuum sensor is disconnected or failed
The numeric display shows overrange when the vacuum pressure is above the useful range of the
BPG-775i

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The numeric display shows under range when the vacuum pressure is below the useful range
of the BPG-775i
Section 6: SERVICING AND MAINTENANCE
GAUGE TUBE SERVICING
In many cases, a gauge sensor may become fouled with oil or other foreign matter, but the 775i sensor
is isolated so there is less risk for contamination. It is however, recommended that the sensor be
checked regularly and cleaned as needed. Is you would like to review how to clean a sensor, you can
find one on thermocouple sensor cleaning here.
Bluetooth Models Operation
For Bluetooth Models: Bullseye Piezo comes equipped with a Bluetooth module, which interfaces with
the Vacuum Gauge Application for remote, real-time vacuum monitoring via Apple Store at
https://appsto.re/us/B1Ix5.i ,or Google Play Store at
https://play.google.com/store/apps/details?id=com.digivac.bullseye ranging up to 300 feet under
ideal conditions.
To enable Bluetooth monitoring, scroll to the menu section marked Bluetooth, and enable or disable
the signal with the up or down arrow. See the included Vacuum Gauge Application instructional
addendum to enable app functioning.

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Maintenance
The Bullseye Precision Gauge Piezo is designed for trouble free use with little or no maintenance
required. A few best practices should be followed. While not required for accuracy, it is best to
mount sensor in stem down orientation where the threads are down towards the ground, and the
wire is up. This will facilitate draining of any foreign matter from the sensor to help mitigate physical
obstruction of the diaphragm.
Keep the measurement unit clean and dry to prevent foreign matter or water from entering the
display and controller electronics. The unit is not waterproof, so splashes of water while the gauge is
powered on can damage the electronics. If a weatherproof version is required, consult DigiVac.
NOTES ON CALIBRATION
There is inherent drift in all sensors including the DigiVac piezo sensors. Drift is specified in the
datasheet, but the specification is typically a worst-case scenario as drift is not easily predicted and
depends on operating environment. DigiVac offers calibration services, including NIST calibration
which provides vacuum data on the gauge. This could be useful to help you determine when the gauge
has drifting out of your determined specifications and will help you determine your optimal calibration
schedule. All DigiVac gauges are sold calibrated against a NIST standard, but only those purchased with
a NIST calibration come with the data. You can pull this information yourself, when you are first using
the gauge to determine its measurement parameters. Having this information will allow you to
determine the optimal calibration interval. The generally accepted calibration interval is 1 year but
depends on what accuracy you require and your standard operating procedures.
Note the sensors have excellent accuracy by themselves. Additional accuracy is gained by calibrating
the sensor controller (the thing with the display and cable coming out of it) to the sensor. The sensor
itself cannot be calibrated, but the sensor-controller pair is. Note: that the 775i sensors accuracy
applies to any type of measurable gases. Readings will be the same regardless of the type of gas you
are trying to measure.

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Vacuum Calibration
The calibration screen contains the numbers necessary to calibrate the gauge to a known good
standard. The “Vacuum” number on in the top right corner is millitorr x 10. For example, in the above
picture 1.3 Torr is displayed. The next number is counts, which is an internal number that literally
represents what is coming into the microcontroller’s A2D converter and is a useful diagnostic. The
numbers on the bottom are:
•760T –the Atmospheric pressure calibration number
•3T –the vacuum or low-pressure calibration number
These numbers on the bottom represent the digital calibration points to be adjusted in order to
achieve optimal calibration. There are 2 ways to calibrate: Manually and Automatically. Press the
circular arrow Select button to cycle through the calibration presets. Each function will capitalize
when highlighted.
Automatic Calibration Procedure:
1. Press select until you get to calibration mode
2. Press select until you get to automatic
3. Set the manifold to 5.0 Torr
4. Press up and down simultaneously
5. Set the manifold 760.0 Torr
6. Press the up and down arrows simultaneously
7. Press up and down again simultaneously to store (This is the step where the calibration
numbers get stored)
At pressures above 775 Torr, the unit may display the text “Overrange”; this is typical as this is the
sensor's highest rated pressure range. For optimal accuracy, readings above 775 Torr, if displayed at
all, should not be used for precision readings.

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*The screen will go negative when the up and down arrows are pressed simultaneously to indicate the
success of the button push.
Section 7: Accuracy
Instrument Repeatable Accuracy
Range
Accuracy
1 ~ 775 Torr
+/- 2 Torr
1 ~ 1033 mbar
+/- 2.665 mbar
0.59 ~ -29.88 inches of Hg
+/- 0.08 inches of Hg
Section 8: SPECIFICATIONS

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Specifications
Vacuum Reference:
Absolute
Sensor:
Piezo P/N SEN-775i-NPT
Resolution:
+/- 0.1 Torr, +/- 0.01 inches Hg
Units:
Torr, microns, mbar, bar, kPa, inches of Hg, mm Hg,
millitorr, inches of water, PSI, Pa
Accuracy:
+/- 2 Torr, +/- 0.08 mbar
Range
1 to 775 Torr, -29.88 to 0.59 inches Hg
Mount
Desktop, Desktop with kickstand or strong magnet
Display
Graphical with LCD
Product Dimensions
6.2” x 3.7” x 1.3”
Power
4 AA batteries or Micro-B USB
Compliance
CE and RoHS
Wetted Materials
316SS
Numeric and graphical displays
See your vacuum readings in either numbers or easy to read graphs
Bluetooth Capabilities (with Bluetooth
models)
Receive your pressure readings on your phone or tablet with the
DigiVac app
Digital Graphs
Easily view line graphs and time horizon of 2 minutes and 2 hours
7-foot Sensor Cable Length
Long cable length for portability and field use
Stability
+/- 0.25% per year
Proof Pressure
60 PSI
Burst Pressure
200 PSI
Section 9: Units of Measurement
This instrument is calibrated in microns or "millitorr." Understanding Microns: Microns are not really
a measure of vacuum at all, but rather of absolute pressure.
The pressure of the atmosphere is 14.696 or approximately 14.7 pounds per square inch at sea
level. One TORR 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.
This pressure is due to the weight of all the air in the earth's atmosphere above any specific square
inch. Note: 14.696 PSI is equivalent to the pressure produced by a mercury column approximately
29.92 inches high or .76 meters (~ 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 with local weather conditions. (Variations of 0.5 inches in a day
are common.) The word “vacuum” means pressure lower than atmosphere. However, in describing
negative pressure, the atmosphere is only a satisfactory reference if we are dealing with vacuum levels

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down to about 27 inches of mercury. Below that, it is more useful to talk in terms of absolute
pressure, starting from absolute zero, which is how the Bullseye Precision Gauge Piezo operates.
Section 10: Options
Product
Part
Number
Interface
CE/
RoHS
Features/Benefits
Bullseye Hard Case
CAS-HARD-
BPG
Y
Hard Case with protective form fitting
foam insert designed to protect
Bullseye, with room for fittings
Bullseye Soft Case
CAS-SOFT-BPG
Y
Soft Carrying Case for Bullseye
Vacuum Gauge, with Digivac Logo
KF25 Adaptor
ADP-KF25
Y
1/8” FNPT to KF25 Adaptor
¼” barb adaptor
ADP-1/4”
Y
1/8” FNPT to ¼” ID hose barb
5/16” barb adaptor
Adp-5/16”
Y
1/8” fnpt to 5/16” id hose barb
3/8” barb adaptor
Adp-3/8”
Y
1/8” FNPT to 3/8” ID hose barb
Section 11: Bluetooth Connectivity
Bluetooth
▪Versatile digital vacuum gauge that you can monitor right from your phone or tablet
(Apple ios and android)
▪Enables remote monitoring and troubleshooting
▪Set low and high alarm from your phone
▪Email vacuum data to document leaks, baseline pressure or pump-downs
Portable and Precise
▪Rugged thermocouple vacuum gauge ideal for understanding: Leaks, Pump Downs,
Outgassing or Stable Systems
▪Includes a powerful magnet and kickstand to enable hands-free operation
▪Long battery life and versatility with 12 different measuring units (micron, 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

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Graphing and Analysis
▪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
Android:Links via Bluetooth Low Energy to Bullseye Piezo with Bluetooth to view, alarm,
log readings and email data for graphing pump down curves. Ideal for vacuum pump test
or finding leaks. For the medium vacuum range with typical measurements in the micron or
millitorr range.
Apple: Links via Bluetooth Low Energy to Bullseye Piezo with Bluetooth to view, alarm, log
readings and email data for graphing pump down curves. Compatibility: Requires iOS 7.0 or
later. Compatible with iPhone, iPad, and iPod touch.

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Section 12: 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.
Exclusive Obligation: The DIGIVAC product you are purchasing has been designed for a specific use within a set of suitable
operating conditions, 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 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 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 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.