WIKA Mensor CPA2501 User manual

Operating Instructions
Air Data Test Indicator
Air Data Test Indicator CPA2501 PN 0018909001F • 02/2019
CPA2501

2 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
Warning
!
This Warning symbol indicates that danger of injury for
persons and the environment and/or considerable damage
(mortal danger, danger of injury) will occur if the respective
safety precautions are not taken.
!
Caution
This Caution symbol indicates danger for the system and
material if the respective safety precautions are not taken.
i
Notice
This Notice symbol does not indicate safety notices but
information for a better understanding of the facts.

Operating Instructions - CPA2501 3
Air Data Test Indicator
CPA2501
1. General Information 7
1.1 Warranty 7
1.2 Important Notice 7
1.3 FCC Radio Frequency Emission Notice 7
1.4 Trademarks and Copyrights 8
1.5 Software License Agreement 8
1.6 Mensor Service Plus 8
1.6.1 After the Warranty 8
1.6.2 Calibration Services 8
1.6.3 Certications and Accreditations 8
1.7 Packaging for Shipment 8
2. Safety Notices 9
2.1 User Responsibilities 9
2.2 General Safety Notices 9
2.3 Warnings and Caution Notices 10
3. General Description 11
3.1 Denitions 11
3.2 Features 11
3.3 Turning On 13
3.4 Front Panel 13
3.5 Display 14
3.6 Chassis Assembly 14
4. Specications  15
4.1 Transducer Specication 15
4.2 Measurement & General Specications 16
5. Installation 17
5.1 Unpacking the Instrument 17
5.2 Dimensions (inches) 18
5.3 Mounting 19
5.4 Rear Panel 19
5.4.1 Pressure Connections 19
5.4.2 Pressure Port 19
5.4.3 Qc Reference Port 20
5.5 Remote Communication Connections 20
5.6 Power Up 20
Table of Contents

4 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
6. Local Operation and Setup 21
6.1 General Operation 21
6.1.1 Setup Applications 21
6.1.2 Display Screen Features 21
6.2 Initial Setup 22
6.2.1 Contact and Version Information Application 22
6.2.2 Language Selection 22
6.3 Application Selection and Parameter Inputs 23
6.4 Applications 24
6.4.1 Measure Application 24
6.4.1.1 Pressure Mode / Emulation Mode 25
6.4.1.2 Auxiliary Displays 25
6.4.1.3 Zero Button 26
6.4.1.4 Tare Button 27
6.4.2 Settings Application 28
6.4.2.1 Languages 28
6.4.2.2 Brightness 29
6.4.2.3 Volume 29
6.4.2.4 User Base Units / Base Units Multiplier 30
6.4.2.5 Barometer Units 30
6.4.2.6 Instrument Mode 31
6.4.2.7 Conguration 31
6.4.3 Frames Application 32
6.4.3.1 Frame Format 32
6.4.3.2 Frames Channel 33
6.4.4 Transducer Application 34
6.4.4.1 Transducer Channel Selection 34
6.4.4.2 Qc or Pt Emulation 35
6.4.4.3 Transducer Filter 35
6.4.4.4 Transducer Resolution 36
6.4.4.5 Auxiliary Displays 37
6.4.4.6 Cal Function 38
6.4.5 Remote Application 39
6.4.5.1 Remote Command Set 39
6.4.5.2 Remote Communication Settings 40
6.4.6 Info Application 41
6.4.7 Leak Test Application 42
6.4.8 Troubleshooting Application 43

Operating Instructions - CPA2501 5
Air Data Test Indicator
CPA2501
6.4.9 Service Application 44
6.4.10 Unlocked Service Application 45
7. Remote Operation 46
7.1 Command Set 46
7.2 IEEE-488 46
7.2.1 IEEE-488.2 Commands 46
7.3 Ethernet 47
7.4 Serial 48
7.4.1 Serial Cable Requirements 48
7.5 Mensor Command Set 49
7.6 Command and Query Format 49
7.7 Command Set Denitions 49
7.8 Output Formats 50
7.9 CPA2501 Commands and Queries 50
7.9.1 Units Command Syntax for Measurement Units 55
7.9.2 CPA2501 Error Codes 56
7.9.3 SCPI Commands and Queries 56
7.9.4 SCPI Commands Error Messages and Error Codes 58
7.9.5 GPIB Capability Codes 58
7.9.6 Interface Functions 58
8. Options 59
8.1 Barometric Reference 59
8.1.1 Gauge Pressure Emulation 59
8.1.2 Absolute Pressure Emulation 59
8.1.3 Emulation Mode Accuracy 59
8.1.4 Barometric Reference Calibration 59
8.1.5 Barometric Reference Specications 60
8.2 External Transducers (CPT6100 and CPT6180) 60
8.2.1 External Pressure Transducer Connection Cable 60
8.3 Rack Mount Kit 60
8.4 Fittings 60
8.5 Remote Calibration 60
8.5.1 Remote Calibration Kit for Internal Transducers. 61
8.5.2 Barometric Reference Calibration Sled 62
8.5.3 External Calibration Procedures 63
8.5.3.1 Transducer Removal 63
8.5.3.2 Barometric Reference Removal 63

6 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
9. Maintenance 64
9.1 Beyond the Warranty 64
9.2 Spare Parts 64
10. Calibration 65
10.1 Calibration Services by Mensor or WIKA worldwide 65
10.2 Environment 65
10.3 Pressure Standards 65
10.4 Media 65
10.5 Setup 66
10.6 Calibration Data 67
10.7 One Point Cal Application 67
10.8 Two Point Cal Application 68
10.9 Linearization 69
10.10 Head Pressure 71
11. Appendix 72
11.1 Measurement Units 72
11.2 Conversion Factors, PSI 73
11.3 Conversion Factors, Millitorr 74
11.4 Conversion Factors, Pascal 75

Operating Instructions - CPA2501 7
Air Data Test Indicator
CPA2501
1 General Information
1.1 Warranty
All products manufactured by Mensor are warranted to be free of defects in workmanship and materials for
a period of two years from the date of shipment. No other express warranty is given, and no armation of
Seller, by words or actions, shall constitute a warranty. SELLER DISCLAIMS ANY IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSES WHATSOEVER. If any defect
in workmanship or material should develop under conditions of normal use and service within the warranty
period, repairs will be made at no charge to the original purchaser, upon delivery of the product(s) to the
factory, shipping charges prepaid. If inspection by Mensor or its authorized representative reveals that the
product was damaged by accident, alteration, misuse, abuse, faulty installation or other causes beyond the
control of Mensor, this warranty does not apply. The judgment of Mensor will be nal as to all matters con-
cerning condition of the product, the cause and nature of a defect, and the necessity or manner of repair.
Service, repairs or disassembly of the product in any manner, performed without specic factory permis-
sion, voids this warranty.
MENSOR MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MANUAL, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. Mensor shall not be liable for errors contained herein or for incidental or con-
sequential damages in connection with the furnishing, performance, or use of this material.
1.2 Important Notice
The product specications and other information contained in this manual are subject to change without
notice.
Mensor has made a concerted eort to provide complete and current information for the proper use of
the equipment. If there are questions regarding this manual or the proper use of the equipment, contact
Mensor at:
Mensor WIKA Alexander Wiegand SE & Co. KG
201 Barnes Drive Alexander-Wiegand-Straße 30
San Marcos, Tx 78666 63911 Klingenberg / Germany
tel: [phone] tel: [phone]
1-800-984-4200 (USA only)
fax: [phone] fax: [phone]
email: [e-mail] email: CT[email protected]
[e-mail]
website: www.mensor.com website: www.wika.de
1.3 FCC Radio Frequency Emission Notice
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment.This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the in-
struction manual, may cause harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which case the user will be required to cor-
rect the interference at his or her own expense.
USE SHIELDED CABLES TO CONNECT EXTERNAL DEVICES TO THIS INSTRUMENT TO MINIMIZE
RF RADIATION.

8 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
1.4 Trademarks and Copyrights
Mensor is a registered trademark of Mensor, LP. All other brand and product names are trademarks or
registered trademarks of their respective companies. ©2014, Mensor, LP. All rights reserved.
1.5 Software License Agreement
This product contains intellectual property, i.e., software programs, that are licensed for use by the end
user/customer (hereinafter “end user”).
This is not a sale of such intellectual property.
The end user shall not copy, disassemble or reverse compile the software program.
i
Notice
The software programs are provided to the end user “as is” without warranty
of any kind, either express or implied, including, but not limited to, warranties
ofmerchantabilityandtnessforaparticularpurpose.Theentireriskofthe
quality and performance of the software program is with the end user.
Mensor and its suppliers shall not be held to any liability for any damages suered or incurred by the end
user (including, but not limited to, general, special, consequential or incidental damages including dam-
ages for loss of business prots, business interruption, loss of business information and the like), arising
from or in connection with the delivery, use or performance of the software program.
1.6 Mensor Service Plus
If you have problems and you don’t nd the answer in this manual, contact Mensor at 1-800-984-4200
(USA only) or 1-512-396-4200 for personal assistance, or at any of the contact addresses listed on the
rear cover of this manual. We are ready to help.
1.6.1 After the Warranty
Mensor’s concern with the performance of this instrument is not limited to the warranty period. We pro-
vide complete repair, calibration and certication services after the warranty for a nominal fee.
1.6.2 Calibration Services
In addition to servicing our own products Mensor can perform a complete pressure calibration service,
up to 30,000 psi, for all of your pressure instruments. This service includes an accredited calibration.
1.6.3 CerticationsandAccreditations
Mensor is registered to ISO 9001:2008.The calibration program at Mensor is accredited by A2LA, as
complying with both the ISO/IEC 17025:2005 and the ANSI/NCSL Z540-1-1994 standards.
1.7 Packaging for Shipment
If the product must be shipped to a dierent location or returned to Mensor for any reason through a com-
mon carrier it must be packaged properly to minimize the risk of damage.
The recommended method of packing is to place the instrument in a container, surrounded on all sides
with at least four inches of shock attenuation material such as styrofoam peanuts.

Operating Instructions - CPA2501 9
Air Data Test Indicator
CPA2501
2 Safety Notices
2.1 User Responsibilities
To ensure safety, the user must make sure that:
• The system is used properly, no dangerous media are used and that all technical specications are
observed.
• The system is operated in perfect operating condition.
• This operation manual is legible and accessible to the user at the system’s location.
• The system is operated, serviced and repaired only by authorized and qualied personnel.
• The operator receives instruction on industrial safety and environmental protection, and is knowledge-
able of the operating instructions and the safety notices contained therein.
2.2 General Safety Notices
i
Notice
The system should only be operated by trained personnel who are familiar with
this manual and the operation of the instrument.
Warning
!
WARNING: A condition for trouble-free and safe operation of this system is proper
transport, proper storage, installation, assembly and proper use as well as careful
operation and maintenance.
Any operation not described in the following instructions should be prohibited.
The system must be handled with care required for an electronic precision instru-
ment(protectfromhumidity,impacts,strongmagneticelds,staticelectricityand
extreme temperatures). Do not insert any objects into the instrument.
The system is powered via the power cable with a voltage that can cause physi-
cal injury. Even after disconnecting the system from the power supply, dangerous
voltages can temporarily occur due to capacitance.
Extreme care must be taken with pressure connections when using hazardous or
toxic media.
Repairs must only be performed by authorized service personnel.
i
Notice
Additional safety notices are found throughout this manual.

10 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
2.3 Warnings and Caution Notices
Warning
!
WARNING: HIGH PRESSURE! High pressure gases are potentially hazardous.
Energy stored in these gases and liquids can be released suddenly and with
extreme force. High pressure systems should be assembled and operated only by
personnel who have been trained in proper safety practices.
Warning
!WARNING: NOT EXPLOSION PROOF! Installation of this instrument in an area
requiring devices rated as intrinsically safe is not recommended.
Warning
!
WARNING: POSSIBLE INJURY! The tubing, valves, and other apparatus attached
to the gauge must be adequate for the maximum pressure which will be applied,
otherwise physical injury to the operator or bystanders is possible.
!
Caution
CAUTION: USE THE PROPER PRESSURE MEDIUM! Use only clean, dry, non-corro-
sivegasesunlessotherwisespeciedbyMensor.Thisinstrumentisnotdesigned
for oxygen use.
!
Caution
CAUTION: As with most sensitive electronic equipment, switch the power switch
obeforeconnectingordisconnectingtoapowersourcetopreventdataloss.Do
notpositiontheequipmentsothatitisdiculttodisconnecttheDCpowerjack.
CAUTION: ESD PROTECTION REQUIRED. The proper use of grounded work
surfaces and personal wrist straps are required when coming into contact with
exposed circuits (printed circuit boards) to prevent static discharge to sensitive
electronic components.
Additional Warning and Caution notices are found throughout this manual.

Operating Instructions - CPA2501 11
Air Data Test Indicator
CPA2501
3 General Description
The CPA2501 can be a single channel altitude/altitude rate indicator (Ps only), a single channel airspeed/
airspeed rate indicator (Qc only) or it can be a dual channel unit congured with a Ps channel and Pt
channel or a Ps channel and a Qc channel. In the Ps/Pt version, Qc is calculated using the equation Qc
= Pt - Ps and is displayed in a “virtual” channel. In the Ps/Qc version, Pt is also calculated using the same
equation and is displayed in a “virtual” channel. Pressure in each channel can also be read in standard
pressure units. An optional barometer can also be installed and displayed as a channel.
Figure 3.1 - Desk top version
3.1 Denitions
Static Pressure (Ps): The absolute pressure of still air surrounding a body. Ps is pressure that would
have existed in the aircraft’s location if the aircraft had created no pressure disturbances; the atmospheric
pressure. Ps is proportional to altitude. The relationship between Ps and Altitude is non-linear.
Total Pressure (Pt): The sum of the local atmospheric pressure plus impact pressure created by the
aircraft moving through the atmosphere.
Impact Pressure (Qc): The pressure a moving stream of air produces against a surface which brings
part of the moving stream to rest. It is the dierence between the Total and Static Pressures (Qc = Pt
- Ps). Qc is proportional to the aircraft speed relative to the surrounding air (indicated airspeed).The
relationship between Qc and indicated airspeed is non linear.
Qc = Pt - Ps
3.2 Features
Signicant features designed into the CPA2501:
• A removable, highly stable, temperature compensated air data transducer package with Ps/Qc or Ps/
Pt conguration.
• Variant conguration: Single Ps Channel, or Single Qc Channel
• 7” Color LCD with touch screen

12 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
• Emulation of Pt or Qc from native internal transducer package.
• Multiple languages; change the language for on-screen text and number/date formats by simply
touching one of the “national ag” icons available in the setup screen.
• Desk top or rack mount
• Local Operation, or command and read remotely.
• An optional removable internal high accuracy barometric reference transducer.
• Optional external transducer: Model CPT6100 or CPT6180.

Operating Instructions - CPA2501 13
Air Data Test Indicator
CPA2501
3.3 Turning On
You can conrm that your CPA2501 is operational right now. Apply power to the power connector on the
rear of the instrument with the included power adapter, remove any plastic plugs from the rear panel
pressure ports, and press the power switch to ON. The system will go through an initialization process,
which takes about 45 seconds, and then a display will appear similar to the screen shown below.
Power Switch
ON/OFF
To see information about the conguration of your new CPA2501, touch the Information Application (App)
icon (see below) on the menu and a window will appear listing the Mensor customer service contact,
model number and the transducers that are installed. Press the Measure App [ ] to return to the main
screen.
Information Application
3.4 Front Panel
The CPA2501 front panel includes a 7” color LCD with touch screen. Operator input is accomplished by
pressing the words or App icons presented on the display. There is a single discrete on/o button and a
USB on the right hand side.The front panel also shows the model number designation and brand logos.

14 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
3.5 Display
The display is made up of two sections. In the main screen (“Measure Application”), the left two thirds
shows the transducer channels that are congured for display, along with the air data or pressure read-
ing, units, channel label, and any auxiliary indications that have been chosen. The right one third of the
screen has Application Icons (“Apps”) for setting viewing options, transducer settings, communication
settings plus a “Page Down” button [ ] that, when pressed, shows a second and third page of icons for
calibration, remote communication error checking and a leak test application.
Transducer Channels Settings Apps
Channel label
and range
Reading
Units and Mode
Auxiliary Indications
Page Down
Buttons, Labels and Windows: The CPA2501 touch screen has many buttons with relevant graphic
icons or text which, when pressed, will open a related window where changes can be made or informa-
tion viewed. Some of these buttons will toggle from one state to another, others present choices or dis-
play a numerical data entry screen. Text or icons that are displayed, but do not respond to being touched,
are called labels or windows. Operators will quickly become accustomed to the particular characteristics
of the frequently used buttons.
Main Screen: The main screen or “Measure Application” appears after power-up. This screen contains
the channel frames and settings button. It will remain as congured after a power cycle.
Transducer Channel Frame(s): The transducer channel frames (left 2/3 of the screen) contain informa-
tion specic to a channel. Up to three channels can be displayed at once, two are shown in the picture
above. The channel frames are color coded with Ps channel red, Qc channel green, Pt channel Blue,
and the remote channel red.The optional barometer channel is sky-blue. If only one channel is installed,
a full frame will be displayed in the color of the channel connected. The channel frame contains the pres-
sure reading, units, and any auxiliary displays that have been chosen.
3.6 Chassis Assembly
The chassis assembly is the housing for the system and the removable transducers. The system has no
user-serviceable parts, and therefore the chassis should not be opened except by qualied repair per-
sonnel at Mensor or certied service locations for any reason except to change the removable transduc-
ers.

Operating Instructions - CPA2501 15
Air Data Test Indicator
CPA2501
4 Specications
Accuracy specications presented herein are obtained by comparison with primary standards traceable
to a national metrology institute or recognized international standard organization. These specications
are obtained in accordance with the ISO Guide to the Expression of Uncertainty in Measurement (GUM).
The calibration program at Mensor is accredited by the American Association of Laboratory Accreditation
(A2LA) as complying with both the ISO/IEC 17025:2005 and the ANSI/NCSL Z540-1-1994 standards. If
there is an exception to the requirements and recommendations of Z540 during a calibration the excep-
tion is noted on the individual calibration certicate.
Mensor reserves the right to change specications without notice.
4.1 TransducerSpecication
Air Data Transducer Package Ps/Qc (CPR8001) or Ps/Pt (CPR8001)
Ps Transducer 0 ... 29.5 to 0 ... 37 (0 ... 950 to 0 ... 1253) in HgA @ 0oC (mbar)
Accuracy (1) 0.009% IS-50 (2)
Pt Transducer 0 ... 40 to 0 ... 110 (0 ... 1355 to 0 ... 3725) in HgA @ 0oC (mbar)
Accuracy (1) 0.01% IS-50 (2)
Qc Transducer -1 ... 3 to -1 ... 100 (-34 ... 100 to -34 ... 3386) in HgD @ 0oC (mbar)
Accuracy (1) 0.01% Full Span
Barometric reference range 17 to 34 (575 to 1151) in HgA @ 0oC (mbar)
Accuracy (1) 0.01% R
Calibration Interval 365 days
Media Compatibility
Metals in contact with media 6000/7000 series Aluminum, 316 SS, brass
Non-metals in contact with media PTFE (Teon®), Urethane, Silicone, RTV, Silicone grease, PVC, Epoxy, Buna-N, uoroelastomers
(Viton®)
Transducer
Reading rate 33 readings/second
Calibration adjustments Internal zero adder and span multiplier, up to 11 point linearization for each transducer
(1) Accuracy is dened by total measurement uncertainty with the coverage factor (k=2) and includes the intrinsic performance of the instrument (linearity, hysteresis, repeatability), the measure-
ment uncertainty of the reference instrument, long term stability, inuences of ambient conditions, drift and temperature eects over the calibrated range, with periodic zero point adjustment.
(2) The Intelliscale (IS) specication is a percent of reading specication combined with a percent of full scale specication. For example the designation “0.01% IS-50”, simply means that the
uncertainty of the transducer is 0.01% of reading above 50% of Full Scale, and 0.01% of 50% of Full Scale below 50% of the Full Scale. The 0.008% IS-33 specication is the same except the
uncertainty is 0.008% and the break over from percent of reading to percent of Full Scale is at 33% of Full Scale. Same rules apply for bidirectional ranges.

16 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
4.2 Measurement&GeneralSpecications
Basic Instrument
Instrument
Instrument version Standard: Table top with tilt feet
Option:
-19” rack-mounting for single instrument mount.
-19” rack-mounting for dual instrument mount.
Dimensions See technical drawing
Weight 12.5 lbs./ 5.7 kg (with all internal options)
Warm-up time Approximately 15 minutes
Display
Screen 7” color LCD
Resolution Selectable from 4 to 6 digits, depending on range and units
Data entry Touch screen keypad
Pressure Measurement Units psi, psf, osi, atm, inH20@4C, inH20@20C, inH20@60F, mbar, bar, Dy/cm2, pascal,
hPa, kPa, MPa, inHg@0C, inHg@60F, mTorr, Torr, mmHg@0C, cmHg@0C, mHg@0C,
mmH20@4C, cmH20@4C, mH20@4C, mmH20@20C, cmH20@20C, mH20@20C,
mSW, ftH20@4C, ftH20@20C, ftH20@60F, inSW, ftSW, tsi, tsf, g/cm2, kg/cm2, kg/m2, %
of Range, + plus 2 user dened units (multiplier from psi, bar or pascal)
Rate Units /sec., /min., /hr., /3-hr
Languages English, German, Spanish, French, Italian, Portuguese, Polish, Russian, Chinese,
Japanese, Korean
Measurement lters O, Low, Normal (default), High
Connections
Number of integrated transducer
(selectable)
Standard: 1 reference transducer
Optional: 2nd reference transducers, external transducer, internal barometric reference
Pressure connections Ranges ≤ 6015 psi: 7/16 - 20 female SAE/MS (adapters provided)
Pressure adaptors Standard: 1/8 in. FNPT
Optional: 1/4 inch tube, 6 mm tube, 1/4 in FNPT, 1/8 in. FBSP.
Overpressure limits 110 % FS typical, optional external relief valves are available
Voltage supply
Power input requirements 100-120 or 200-240 VAC, 50-60Hz, 24VA max
Switching power supply Output: 12 VDC, 1.7 A (includes 4 region specic plugs adapters)
Permissible ambient conditions
Storage temperature range 0 to 70 deg C
Operating environment 0 ... 95 % RH (relative humidity, non-condensing)
Operating temperature range 15 ... 45 deg C
Operating Altitude <3048 meters (10,000 ft)
Communications
Remote interface IEEE 488, RS-232, USB and Ethernet
Command sets Mensor, WIKA SCPI
CE conformity and certicates
CE compliance EN61326-1:2013 electromagnetic compliance
EN61010-1:2010 safety/CB scheme
EN50581:2012 hazardous substances
Calibration Calibration certicate per ISO/IEC 17025:2005. Accreditation is by the American
Association for Laboratory Accreditation (A2LA).

Operating Instructions - CPA2501 17
Air Data Test Indicator
CPA2501
5 Installation
5.1 Unpacking the Instrument
In addition to functional testing, each unit is inspected for appearance prior to leaving the factory. Upon
receipt, please examine the instrument for shipping damage. Report any apparent damage to the carrier
immediately.
In addition to this manual you should have:
• CPA2501 Air Data Test Indicator;
• Power Supply;
• Fitting adapters ordered;
• Any accessories ordered;
• An envelope containing the calibration certicate.

18 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
5.2 Dimensions (inches)
Front view
Single mount - Front view
Side view
Dual mount - Front view
19” rack mount
Desk top case
Rear Panel
IEEE-488
Baro ref port
(baro ref option)
Remote Transducer
connection
RS-232
USB (device)
USB (host)
Ethernet port
Power
Ps Port
Qc or Pt Port
Qc Reference

Operating Instructions - CPA2501 19
Air Data Test Indicator
CPA2501
5.3 Mounting
The instrument can be set up on a desk top or it can be rack-mounted. Rack mount hardware is optional
on the CPA2501 (see Section 5.2 Dimensions and Section 8, Options).
The special sensors used in the CPA2501 are relatively insensitive to tilt and vibration. However to further
assure stability and accuracy, avoid mounting the instrument on surfaces subject to excessive motor or
machinery vibration.
5.4 Rear Panel
A single dual transducer is installed in the CPA2501 chassis consisting of a Ps/Qc or a Ps/Pt transducer
set. The CPA2501 is also available in a single channel conguration with a Ps (altitude) or Qc (airspeed)
channel only. In the upper right corner is a hose barb tting which is connected to the baro ref if installed.
Positioned on the left side is a remote transducer connection, the RS-232, Ethernet, IEEE-488, USB de-
vice connections for communication, the USB host connection and the 12 VDC power input.
Figure 5.4 - Rear Panel
5.4.1 Pressure Connections
i
Notice
Whenmakingupaconnectiontoano-ringadapterttingportuseaback-up
wrench to prevent over-stressing the threads in the manifold block.
The pressure ports on the rear of the CPA2501 are female 7/16 - 20 SAE/MS straight threads per
MS16142 and SAE J514 table 14. Connected adaptors require a tube tting boss seal with an o-ring per
MS33656. Mensor can provide a variety of adapter ttings (see Section 8, Options) with the instrument.
Do not use sealant on ttings sealed with an o-ring. The integrity of each seal is particularly important
since even microscopic leaks can cause errors in measurements.
5.4.2 Pressure Port
The CPA2501 will precisely measure the altitude or airspeed corresponding to the pressure connected to
the pressure port up to the full scale range of the transducer installed.

20 Operating Instructions - CPA2501
Air Data Test Indicator
CPA2501
5.4.3 Qc Reference Port
The reference port is available on Qc units. This port must be connected to the Ps pressure side, or both
open to atmosphere for an accurate Qc reading . This is due to the common mode correction. The correc-
tion is used to remove osets of both zero and span when the reference pressure is changed. The correc-
tion utilizes the Ps channel’s pressure value. In a Ps/Pt transducer, this port is plugged.
5.5 Remote Communication Connections
See Section 7, Remote Operation, for connections and commands for operation over IEEE-488, Ether-
net, USB or RS-232 ports.
5.6 Power Up
Apply power to the power connector on the rear of the instrument using the power adaptor included, and
switch the power switch on the front of the unit ON. The instrument will go through an initialization pro-
cess and system check. As soon as the system check is completed the system will default to a screen
similar to the one shown in Section 6.1.2 - Display Screen Features. The main measurement screen may
be congured in many dierent ways but initially it will be in a default conguration. Subsequently, the unit
will power up in the conguration that it was in when last powered o. Allow at least 15 minutes of warm
up before performing critical pressure measurements.