Ametek Crystal Pressure nVision User manual

nVision Operation Manual
for Reference Recorder

Contents
Overview...............................................................1
Introduction..............................................................1
Quickstart................................................................2
Functions ..............................................................3
On/O...................................................................3
Measurements & Recording ................................................3
Numerical Display Overview ................................................5
Graphical Display Overview ................................................5
Graphing ................................................................6
Averaging Mode ..........................................................7
Dierential Mode .........................................................7
Run Tags .................................................................8
Chassis .................................................................9
Chassis Controls ..........................................................9
Serial Numbers ..........................................................13
nVision Reference Recorder Specications ...................................14
Modules ...............................................................15
Module Installation Instructions............................................15
Pressure Module (PM) Instructions .........................................17
Pressure Module (PM) Specications ........................................18
Barometric Reference (BARO) Module Instructions ............................22
Barometric Reference (BARO) Module Specications ..........................23
Absolute Pressure Specications ...........................................24
Current, Voltage, and Switch Test (MA20) Module Instructions ..................25
Current, Voltage, and Switch Test (MA20) Module Specications ................27
Temperature (RTD100) Module Instructions .................................29
Temperature (RTD100) Module Specications ................................32
Resistance Temperature Detectors (RTD) ....................................33
Power ..................................................................35
Battery Power ...........................................................35
USB Power ..............................................................37
Reset ...................................................................37
Safety and Certifications ........................................38
Hazardous Locations .....................................................38
Certications ............................................................38
Multi-language Safety Instructions .........................................39
Support ...............................................................44
Troubleshooting .........................................................44
Calibration ..............................................................46
Accessories and Replacement Parts .........................................47
Contact Us ..............................................................48
Trademarks .............................................................48
Warranty................................................................48

Overview 1
nVision Operation Manual
Overview

INTRODUCTION
Thank you for choosing the nVision Reference Recorder from Crystal Engineering Corporation. The philosophy behind nVision:
nVision lets you visualize measurements graphically, with or without a pc, in real time as it is being recorded. It is much easier to identify trends or anomalies
visually, than in tables of data or spreadsheets.
nVision is tremendously exible and can be congured to measure and record a variety of combinations of measurements. In addition to pressure, modules
for temperature, voltage and current can be used.
Because all of these inputs can be displayed individually as numbers or as graphs, or in combination with other inputs (numerically and graphically) we also
provide a way to simplify nVision, so you can limit the available screens to only those that are of use to your specic task.
Accuracy is up to 0.025 percent of reading
– so any nVision can typically replace several gauges or calibrators you may have been using. The nVision is fully
temperature compensated
– so there is no change in accuracy throughout the entire operating temperature range!
The nVision features two identical bays allowing conguration of the reference recorder to meet your requirements. All modules are eld-replaceable allowing
you the exibility to react to changing needs and module calibration requirements.
The nVision’s case is made from a rugged injection molded polymer utilizing a gasket to seal the enclosure against dust and water intrusion. Even the mini
USB B connector is fully sealed (with or without the protective boot cover). Circuitry is mounted in a shock-absorbing elastomeric system and the batteries are
easily accessible by removing four captive screws.
Other features include:
•Log and display 500,000 points at up to 10 readings per second on up to two modules simultaneously
•Interactive real-time graphing of measurements
•ATEX / IECEx Scheme intrinsically safe
•IP67 rated enclosure —1 meter immersion for 30 minutes
•Uses Crystal’s CPFttings and hose system (leak-free and nger-tight to 10 000 psi (700 bar)) U.S. Patent No. 8,794,677
We hope your nVision meets your expectations, and we’re interested in any comments or suggestions you may have. You can send us a note at:
[email protected]. Many features in this and our other products are a direct result of your comments!
Crystal Engineering is the company that designs, manufactures, and services the nVision reference recorders, XP2i series pressure gauges, 30 series pressure
calibrators, MultiCal multimeter pressure modules, and a variety of industry specic pressure measuring equipment.
Crystal Engineering pioneered features like full temperature compensation and“of reading”rated gauges and calibrators. Pressure measuring equipment is
the only thing we do and that’s why we say:
™
Your nVision can be customized to meet
your specic test needs through the use
of CrystalControl™ software. Your personal
computer can disable, enable, or modify a
variety of features of your nVision. Look for
the logo for user program-
mable features, like:
•User dened pressure units, and/or disable
unused pressure units
•Password protection to prevent unauthor-
ized changes to gauge settings and/or
product keypad access
•Expand or decrease allowable Zero range
•Set the gauge to a dierent density of water
factor (4°C, 60°F, or 68°F)
•Store custom ID or tag numbers in
non-volatile memory
•Adjust calibration values
CrystalControl is included with your nVision,
and is also available as a download from our
website at ametekcalibration.com.

Overview 2
nVision Operation Manual

QUICKSTART
This icon represents a component that can be modied with CrystalControl software
Upper Module Bay
Home button:
Brings you back to the default screen
(Change Home Screen)
Next button:
Progress through the display screens
LED Indication alerts:
: Flashes while recording
(Flashes quickly when recording ends)
: Flashes when a module's range is exceeded
Record button:
Start/Stop data recording
(Adjust Logging Interval)
Backlight button:
Turn on/o display backlight
(Adjust Backlight Shuto)
Power button:
Turn your nVision on/o
Zero button:
Press to zero Pressure Module reading (- - - - -)
Hold for 5 seconds to clear any zero value (- - -)
(Adjust Zero Limit)
Lower Module Bay
Setup Button:
Locate additional features:
• Clear Peaks
Units (Adjust Available units)
• PM Mode: Gauge or Absolute
Settings
• Contrast
• Lock/Unlock Chassis
Summary
• Chassis, Upper, Lower
Recording
• Start/Stop
• Erase All Runs
Navigation & Select
Back button:
Previous Display Screen
Power Icon Key
Icon
Description
External
Power
(USB)
100% 75% 50% 25% 0%*
Power Remaining
*Replace Batteries or connect to USB Power

Functions 3
nVision Operation Manual
Functions

ON/OFF
Power button
Press and hold the (power)button for 1 second to turn the nVision on or o. The nVision will automatically power down if not used for the time period
dened in CrystalControl.
Automatic Shuto - Low Power Mode
Adjust your Automatic Shuto time (shut o time in absence of key press) to optimize battery life. This feature is adjustable from 30
seconds to“always on.”During a recording, the nVision will enter Low Power Mode instead of shutting o.
When powered by USB, the nVision does not employ any power management strategies. Therefore, it will not automatically shut o to the settings dened by
CrystalControl.
During a recording with a Logging Interval of 1 reading/minute or slower, your nVision will enter Ultra-Low Power Mode after the rst reading elapses and the
Automatic Shuto Timer runs out.
The Backlight Shuto is set separately in CrystalControl. It is unaected by other settings.

MEASUREMENTS & RECORDING
Recording
The nVision can record at rates from 10 readings per second to 1 reading per hour as set in CrystalControl. Adjust your recording rate to optimize battery life
and data recording space.
Your nVision is capable of recording more than 500,000 data points when both module bays are populated. With one bay populated, this
number doubles. CrystalControl will give you a more accurate view of recording times based on the logging rate and enabled screens for your nVision.
When connected to CrystalControl you can congure, control, and graph an nVision recording directly from your PC, without handling the nVision chassis.
To start or stop a recording run from any screen:
1Press the (record)button for one second.
Note: You may be prompted to enter a Run Tag, if enabled. For more information, see Run Tags.
2The red LED will start ashing when the recording begins.
3To stop recording, press the (record)button again. The red LED will ash twice.
Note:
The nVision records data for all screens enabled in Crystal Control. Even if you are viewing data for the lower module numerical display,
data for the upper module will still record if any of the screens for that module are enabled. Use CrystalControl to check which data screens are enabled.

Functions 4
nVision Operation Manual
Zero
To zero the nVision:
•Press the (zero)button for at least 1 second while vented to atmosphere until the dashed lines (- - - - -) appear.
To clear the zero value:
•Hold the (zero)button for 5 seconds until the display changes from (- - - - -) to the zeroed value, then to (- - -).
You can adjust the Zero Limit at which the (zero)button will display “- -HI- -”in CrystalControl. You can also disable the (zero)button
entirely, by setting the zero value to a negative number less than -15 psi.
Note: If you attempt to zero the gauge with more pressure applied than the Zero Limit set in with CrystalControl, the command will be ignored, and“- -HI- -”
will display.
Note: You can never zero the BARO sensor.
! WARNING: This gauge can display zero pressure when connected to a source of pressure! Do not rely on the display indication before disconnecting—
it may not be indicating true pressure. Never disconnect pressure instrumentation without rst relieving system pressure!

Functions 5
nVision Operation Manual
Lower Module Screen
Dual Module Screen Data Point Screen (Single Sensor)
Upper Module Screen
Selectable Units (via Setup button)
(Enable, disable, or create units)
Vertical Scale:
Applied versus
full-scale pressure
(Pressure Module Only)
Sensor Reading biased towards applicable
module location in the chassis
Indicates current data point
Current readingDate & Time Stamp
High / Low:
Peak always measured
at 10 readings per
second
Filter:
Average of most recent
20 readings

NUMERICAL DISPLAY OVERVIEW
Numerical Upper and Lower Module screens Numerical Dual Mode Screen
(Both Sensors)
Data Point Counter Screen
Note:
To change the displayed units
on any Numerical Display,
see the Units section.
Note:
To change the displayed units
on any Graphical Display,
see the Units section.
BARO module reading
Lower Module Screen
Dual Module Screen
Upper Module Screen
For safety, live readings are
displayed regardless of
cursor location or zoom level
Date and Time Stamping
Date and Time
Stamping

GRAPHICAL DISPLAY OVERVIEW
Graphical Upper and Lower Module screens Graphical Dual Mode Screen
(Both Sensors)
Graphical BARO Screen
(Both Sensors)
Dual Module Screen
Displays barometric pressure from
BARO module vs. output from one
pressure module (Upper or Lower)
Left y-axis indicates the scale of the
lower module. Right y-axis indicates
the scale of the upper module
Pressure module reading
Maximum Working
Pressure:
(Pressure Module Only)
/min:
Rate of change per
minute
On all graphical screens
the triple-arrow icon
indicates the module
currently displayed

Functions 6
nVision Operation Manual

GRAPHING
Navigating the Graphical Display
In the graphical modes the nVision navipad enables you to control how you view your data. The ()& ()keys allow you to navigate to
specic points along your run, while displaying reading and time information. The ()& ()keys allow you to zoom in and out of your
recorded run to suit your needs.
Panning Across the Data Set
To inspect the latest or current data recording, use the ()& ()keys to move the cursor within the display window. During live recording, data streams
from the right side of graphical display screens. Therefore, the most recent data will always appear on the far right of the display.
Cursor location
Live recording area
Zooming in on Specic Data
To see more detail on the latest or current data recording, you may zoom in or out on your cursor.
1Use the ()and ()arrows to zoom in or out in any graphical display, during or after recording.
2To return to the fully zoomed out view (viewing the complete run) simply hold the ()arrow for 5 seconds, or until you are completely zoomed out.
Normal View Zoom View
During any zooming keystroke a zoom
in ( ) or zoom out ( ) icon appears
When zoomed in, small arrows appear on
the horizontal time bar.

Functions 7
nVision Operation Manual

AVERAGING MODE
Averaging mode reports the average reading during the recorded run. If this screen is enabled, data displayed here represents the average of all past data
points, over the duration of a recording. The start date and time, duration of the recorded run, and the live reading are displayed.
nVision calculates averages as follows:
r1 +r2 +r3 ...+rn
n
rn=current reading
n=total number of readings
Averaging Mode

DIFFERENTIAL MODE
The nVision automatically displays numerical and graphical dierential screens if two similar module types are installed. ΔP becomes available if your nVision
is populated with two PM modules. ΔT becomes available if your nVision is populated with two RTD100 modules.
In the case of the pressure modules (PM), this mode does not require them to be the same full scale range.
! WARNING: Two MA20 modules cannot be installed at once. This conguration may permanently damage your nVision.
In Dierential Mode the ΔP or ΔT represents a ltered reading of the upper module – lower module + tare reading.
Filtered live reading of upper module
Filtered live reading of lower module
Tare value equalizes the upper and lower modules
Dierential Mode
The units selected for this view are independent of the units selected for the other screens such as the Numerical or Graphical views. Data viewed in the
Graphical screens will represent the data acquired from either module and not represent the specialized view of the Dierential Mode.
Note: To change the displayed units on any Dierential Display, see the Units section.

Functions 8
nVision Operation Manual
Tare
Using the Tare function improves your dierential measurement uncertainty signicantly if used properly. The Tare function equalizes (normalizes) the nVi-
sion’s two modules at a non-ambient datum. The Tare reading displays the same units as the main ΔP or ΔT reading.
If you apply the same static line pressure, temperature, or resistance signal to both sensors simultaneously, you should have a dierential reading of zero. Due
to the allowable error tolerance for each module, the reading may not be zero. The Tare function allows you to normalize both readings so that the dierential
reading is zero. This gives you a more accurate dierential reading than if this process were not completed.
Note: Tare should be reestablished every time your measurement conditions change, including vent condition. For instance if your ΔP reading has 8 inH20 of
Tare at 1500 psi static, when you return to vent condition this 8 inH20 of Tare will remain in place on your ΔP reading until cleared with the Tare button.
To Tare:
1Use the (next)button to select the Dierential Mode Numerical Screen.
2Press the (zero)button until the display ashes dashed lines (- - - - -).
3To clear the Tare value in the Dierential Mode, hold the button for 3 seconds until the main display readings change from (- - - - -) to (- - -).

RUN TAGS
Run Tags are 22 character identiers you can enter to name each data run. They are enabled by selecting the Enable Run Tags checkbox.
The Run Tags you choose will display in CrystalControl's DataViewer and your downloaded data.
To use Run Tags:
1Press (record)from any screen. A QWERTY keyboard will appear, giving you the option to add your Run Tag.
2Use the (), (), (), and ()arrows and the (select)button to edit your Run Tag on the QWERTY keyboard.
3Press the (next)button, or move to the onscreen checkbox and press the (select)button.
Your recording will begin immediately.
You can also enter up to ve predened Run Tags when the Predened Run Tags box is checked.
1Press
(record)from any screen.
2Use the (), ()arrows and the (select)button to choose a Run Tag from the list.
3Use the (), (), (), and ()arrows and the (select)button to edit your Run Tag on the QWERTY keyboard.
4Press the (next)button, or move to the onscreen checkbox and press the (select)button.
Your recording will begin immediately.
Note: If you enable Run Tags in CrystalControl, you will be prompted to select a Run Tag prior to every recording. You can also see your Run Tag info through
the setup button during a recording. See View the current Run Tag during a recording for instructions.

Chassis 9
nVision Operation Manual
Chassis

CHASSIS CONTROLS
Setup Button
Pressing the (setup)button brings up a selectable menu including Clear Peaks, Units, Settings, Summary,and Recording.On the (navipad), use the
()and ()arrows to move to the desired feature and use the (select)button or ()and ()arrows to move into the desired function.
The nVision Setup menu
Clear Peaks (Resetting Hi and Lo Peaks)
Note: Dashed lines will briey appear across the peak value indicators. Clearing the peaks will not aect the zero values or the Filter value.
Units
Selecting Units allows you to change the displayed units on any screen. See the module specications in the Modules section for a list of available units. With
a BARO module installed, you can switch between absolute and gauge pressure. On the Dierential Mode screen, you can switch the units of the dierential
measurement. When you change the displayed units for a module, the units for that module will change in every screen—except Dierential Mode.
Note: The unit displayed at the beginning of a recording run remains the default unit for that run. All other units enabled in
CrystalControl will be available in CrystalControl’s DataViewer.

Chassis 10
nVision Operation Manual
Changing Units—Single Module, Numerical or Graphical Screen
Changing Units—Dual Module, Numerical or Graphical Screen
Changing Units—Dierential Screen
Changing Units—BARO, Numerical or Graphical Screen
Changing Between Absolute and Gauge Pressure—Numerical or Graphical Screen

Chassis 11
nVision Operation Manual
Settings
Adjust Contrast (100%) (50%)
(75%)
Lock the nVision
The Screen Lock Password feature will also be found in Settings, if enabled in CrystalControl. Prevent access to your nVision by protecting
your device with a 4-digit keypad lockout set in CrystalControl.
To unlock the nVision, simply enter the 4 digit password with the arrow keys and press the (select)button. The correct password will allow you back into
standard nVision operation. An invalid code will reject your attempt and allow you to enter another password.
Note: In the event you lose the password, you will need to contact the factory for an unlock code, which will remove the password protection.

Chassis 12
nVision Operation Manual
Chassis Summary
•Serial Number
•Firmware Version
•CPLD Version
•Date/Time
•Automatic Shuto
•Backlight Shuto
•Logging Interval
•Message Store
•Installed Modules
Module
•Model
•Serial Number
•Firmware Version
•Calibration Date
•Calibration Due
•Message Store
•Userspan
•Available Units
Module Specic Information
•Temp. Coecients (RTD100)
•Base Resistance (RTD100)
•Lead Type (RTD100)
•Zero Limit (PM)
Summary Screen
The Summary screen allows you to view details or settings in your chassis or module.
View a Module Summary
Once you have selected a summary screen, you may also use the ()and ()arrows to move to the next summary screen.
Press the (Setup)button again to exit the summary screen.
Note: If a BARO module is installed, BARO Module will appear in the Summary drop-down menu list below Lower Module.
Summary Contents
The specic information in the Summary screens are:

Chassis 13
nVision Operation Manual
Recording
Start a Recording
Press the (record)button until the red LED indicator ashes.
View the current Run Tag during a recording
Erase All Runs
A conrmation screen will ask, Are You Sure?. Press (select)to continue and erase all the data runs on this nVision. Press the (back)button to cancel.
! CAUTION: Never remove power (either battery or USB) during the erasing process.

SERIAL NUMBERS
All serial numbers can be viewed using the nVision Summary screens or in CrystalControl.
Each product has a maximum of four serial numbers, one for the chassis and one for each of the modules (upper, lower, and BARO). Chassis serial numbers are
located in the power bay. Module serial numbers are located on the module and can also be viewed in the power bay of the Reference Recorder. Serial Num-
bers consist of 6 numbers, with the left most digit representing the year of manufacture. For example: 937834 was manufactured during 2009.

Chassis 14
nVision Operation Manual

NVISION REFERENCE RECORDER SPECIFICATIONS
Temperature (Operating and Storage)
Operating & Compensated. . . . . . . -20 to 50°C (-4 to 122°F).
Storage. . . . . . . . . . . . . . . . . . . . . . . . . . - 40 to 75°C (-40 to 167°F).
Humidity
<95% Relative, non-condensing
IP Rating
IP67 rated enclosure (1m immersion for 30 min) per IEC 60529
Electrical Connection
Electrical Connection . . . . . . . . . . . .mini-USB B (environmentally sealed chassis connector).
nVision under USB power consumes less than 100 mA.
! WARNING: The mini USB B connector shall not be used within the hazardous atmosphere. It shall
be used in the non-hazardous atmosphere with either“Safety Extra Low Voltage
Circuits”(SELV) or“Protective Extra Low Voltage Circuits” (PELV). The USB connector
has a Um of 6V.
SELV and PELV denitions per IEC60079-11 are:
Safety extra-low voltage (SELV): Extra-low voltage system (i.e. normally not exceeding 50 VAC or 120
V ripple-free DC) electrically separated from earth and from other systems in such a way that a single
fault cannot give rise to an electrical shock.
Protective extra-low voltage (PELV): Extra-low voltage system which is not electrically separated from earth but which otherwise satises the requirements
for SELV.
Note: A 50V center-tapped earth system is a PELV system.
Mounting
Permanent Mounting . . . . . . . . . . . . four M4 x 0.7 threaded inserts: 8mm deep (see drawing for location)
Enclosure
Impact resistant injection molded housing and elastomeric protective boot compatible with common industrial uids, including Skydrol.
Weight: 680g (1.5 lbs) including one each PM and RTD100 module, 4AA battery module, and protective boot.
51
2.00
0.60
15
37
1.44
25
SENSOR
DIAPHRAGM
SURFACE
1.00
ALL DIMENSIONS ARE IN MILLIMETERS [INCHES] RTD100 MATING CONNECTOR
FOR RTD PROBE SHOWN
INSTALLED
RTD100 CONNECTOR
SHOWN WITHOUT
PROTECTIVE CAP
PHILLIPS X 4
THUMBSCREWS WITH
SHOWN
4AA BATTERY MODULE8MM [0.31 in] DEEP
THREADED INSERTS
M4 X 0.7
4 PLACES
C
L
40 X 12 [1.6 X 0.5]
MOUNTING SURFACE
2 PL
21
0.81
1.20
2 PLACES
5.50
140
30
0.75
FLATS
WRENCH
19
3.93
ACCESS
BATTERY
100
2.88
ACCESS
73
BATTERY
20
0.79
MINI USB-B
ACCESS
FLAP
[2.41]
60
MEDIUM PRESSURE FEMALE (MPF)
PRESSURE MODULE (PM) SHOWN
CRYSTAL CPF SYSTEM:
RTD100 MODULE SHOWN
WITH INCLUDED
PROTECTIVE CAP
[7.08]
178
110
[4.38]
204
MAXIMUM
WITH TWO
PRESSURE
MODULES
8.05
TUBE SYSTEM
(1/4" MEDIUM PRESSURE
WITH 7/16"-20 INTERNAL THREADS)
The nVision enclosure

Modules 15
nVision Operation Manual
Modules

MODULE INSTALLATION INSTRUCTIONS
The nVision’s upper and lower bays allow for removal of modules in the eld. All module changes should be completed in a dry, clean environment, indoors.
Proper electrostatic discharge (ESD) grounding techniques should be taken into account prior to the module change over. If you’re removing a module with-
out installing a replacement, a blank plate (P/N: BNKPLT) must be installed to ensure your IP67 rating and to protect the product.
! WARNING: Do not install two MA20 modules simultaneously. Permanent damage may occur.
! CAUTION: Do not proceed unless you have a suitable replacement module or blank plate for the module bay in question.
Note: Follow these steps to change modules.
1Before removing or replacing any modules, ensure that all recorded data has been archived properly through the use of Export Data in
CrystalControl.
2Clean exterior of nVision, if necessary, to ensure no moisture or foreign matter will enter the enclosure when disassembled.
3Power o nVision and remove any existing power or USB connections.
! WARNING: Failure to disconnect nVision from 4AA, USB, or AC power before module removal or installation may cause damage.
4
Loosen the four T10 Torx screws retaining the module face plate and carefully pull the module straight out of the chassis (avoid twisting). Make note of the
orientation of module connector (located closest toward the display) in relation to the nVision chassis.
Note: Please ensure that the module's o-ring is also removed with the module.
(4x)
(4x)
Note: Due the physical form and the IP67 sealing strategy employed, some modules may be dicult to remove. If necessary, connect a tting or RTD cable to
the appropriate module to aid in module removal. Never force the separation of a module from an nVision chassis.

Modules 16
nVision Operation Manual
5Install a new module in the same orientation as the one removed in step 4. The tri-lobe design of the module will not allow improper installation; do not
force installation of the module as permanent damage may occur.To ensure an IP67 rated seal, lightly lubricate the module’s o-ring (P/N: 4110) with Dow
111 silicon lubricant or equivalent.
(4x)
Lightly lubricate the o-ring, then install the module in the proper orientation.
Note: If installing a Blank Plate, conrm orientation is at and even within the module bay for proper sealing.
6Tighten face plate T10 Torx screws to 50 in-oz (0.35 newton meter (N-m)) torque.
7
Replace power module/plug and tighten to 50 in-oz (0.35 newton meter (N-m)) torque to ensure IP67 seal. When power is rst applied the unit will automatically
turn on. Ensure that nVision recognizes the new module by conrming in CrystalControl or the Summary screens.
8Before using the nVision to record, Erase All Data. See Recording in the Chassis chapter.
9If you have any problems during this process, check the Troubleshooting section for relevant information or contact us at
[email protected] or [phone].

Modules 17
nVision Operation Manual

PRESSURE MODULE PM INSTRUCTIONS
Pressure Connection
Crystal CPF System: Medium Pressure Female (MPF) (1/4” medium pressure tube system with 7/16-20 threads). See our CPF Brochure for further information.
CPF o-ring size and material: AS568A-012, Viton 90 durometer (P/N 3981).
For most applications CPF Fittings can be hand tightened (no tools required). Wrench tightening is recommended (to achieve a metal to metal cone seal) for
applications where chemical compatibility of the process uid and the o-ring are a concern. Cone seals require only moderate assembly torque to seal up to
10000 psi (700 bar). We recommend a tightening torque of 120 in-lbs ±20 in-lbs for our CPF ttings. Please note this is only a fraction of the typical torque
required to seal a 1/4”NPT tting. If a torque wrench isn’t practical to use, the ttings can be assembled as follows: Hand tighten tting fully
until the cone has bottomed out. Tighten an additional 20º using a wrench. Apply a small amount of media-compatible lubricant to the gland threads and
male cone to increase tting life, reduce the likelihood of galling, and promote sealing.
! CAUTION: To achieve CPF maximum allowable working pressures no o-ring substitutions are allowed. See our CPF brochure and
CES-003 CPF Safety Guide available from the website at ametekcalibration.com for further detail.
Measuring Vacuum
All versions of the nVision can be used to measure moderate vacuum.
When measuring pressure less than ambient barometric conditions, a minus (-) sign will appear.
! CAUTION: The nVision is not recommended for continuous use at high vacuum.
Water Density (Inches of Water)
The following applies only to models where inches of water is a selectable pressure unit. As shipped from the factory, the nVision is set to display inches of
water corresponding to the density of water at 4°C (39.2°F).
You may require a dierent water density for your application. CrystalControl allows the user to select the appropriate water density desired
at 4°C (39.2°F), 20°C (68°F), or 15.6°C (60°F) temperatures.
Overpressure Conditions
The nVision will read pressure up to approximately 110% of the rated pressure range. Above 110% of the range the display will start ashing and the readings
will not be reliable. The zero function does not aect when the display starts ashing to indicate overpressure, so depending on the zero value it is possible
that the display can start ashing without the maximum pressure being displayed.
For instance, if a 100 psi nVision is zeroed when 30 psi is being applied, it will indicate that the overpressure condition has been reached at 80 psi
(i.e., 110% x 100 psi – 30 psi = 80 psi).
Overpressure can aect accuracy, but the eect is only temporary unless the sensor has been destroyed. See Pressure Module (PM) Specications for maximum
allowable overpressure ratings.

Modules 18
nVision Operation Manual

PRESSURE MODULE PM SPECIFICATIONS
Pressure Module Tables
Module
Range
0 - 30%
Gauge Full Scale
30 - 110%
Gauge Full Scale
psig ± (% Full Scale) ± (% of Reading)
psi
30 0.0075% 0.025%
100 0.0075% 0.025%
300 0.0075% 0.025%
1000 0.015% 0.05%
3000 0.015% 0.05%
10000 0.015% 0.05%
15000 0.015% 0.05%
barG ± (% Full Scale) ± (% of Reading)
bar
30.0075% 0.025%
10 0.0075% 0.025%
30 0.0075% 0.025%
100 0.015% 0.05%
300 0.015% 0.05%
700 0.015% 0.05%
1000 0.015% 0.05%
kPaG / MPaG ± (% Full Scale) ± (% of Reading)
kPa /
MPa
300 0.0075% 0.025%
10.0075% 0.025%
30.0075% 0.025%
10 0.015% 0.05%
30 0.015% 0.05%
70 0.015% 0.05%
100 0.015% 0.05%
kg/cm2G ± (% Full Scale) ± (% of Reading)
kg/cm2
30.0075% 0.025%
10 0.0075% 0.025%
30 0.0075% 0.025%
100 0.015% 0.05%
300 0.015% 0.05%
700 0.015% 0.05%
1000 0.015% 0.05%
Accuracy (Gauge)
0 to 30% of Full Scale . . . . . . . . . . . . . . . ±(0.0075% of Full Scale) or ±(0.015% of Full Scale)
30 to 110% of Full Scale. . . . . . . . . . . . . ±(0.025% of Reading) or ±(0.05% of Reading)
Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . For 100 psi / 10 bar / 1 MPa / 10 kg/cm² and lower
±(0.06% of Full Scale*)
For 300 psi / 30 bar / 3 MPa and 30 kg/cm²
±(0.06% of Full Scale*) ±1 LSD
*Full Scale = -14.5 psig, -1.0 bar, -99.9 kPa, -1.0 kg/cm2.
Accuracy specications include all eects of linearity, hysteresis, repeatability, temperature, and stability for one year.
Note: Exposure to environmental extremes of temperature, shock, and/or vibration may warrant a more frequent
recertication period.
PM modules must be exercised and re-zeroed whenever exposed to signicant changes in environmental conditions to achieve these
specications. To exercise a gauge, cycle the gauge between zero (ambient barometric pressure) and the pressure of interest.
A properly exercised gauge will return to a zero reading (or return to the same ambient barometric reading).
! CAUTION: Pressure Modules (PM) are not recommended for continuous use at high vacuum.