Mensor CPG2400 Operating Manual

Digital Pressure Gauge

CPG2400

Operating Instructions

Digital Pressure Gauge CPG2400 Series PN 0017460001S • 10/2014

Digital Pressure Gauge
CPG2400 Series

This Warning symbol indicates that danger of injury for persons

!

Warning

!

Caution

and the environment and/or considerable damage (mortal danger,
danger of injury) will occur if the respective safety precautions are
not taken.

This Caution symbol indicates danger for the system and
material if the respective safety precautions are not taken.

This Notice symbol does not indicate safety notices but
information for a better understanding of the facts.

2 Operating Instructions CPG2400 Series

Digital Pressure Gauge
CPG2400 Series

Table of Contents

1. General Information 5

1.1 Warranty 5

1.2 Important Notice 5

1.3 Software License Agreement 6

1.4 Mensor Service Plus 6

1.4.1 After the Warranty 6

1.4.2 Calibration Services 6

1.4.3 Accreditations 6

2. Safety Notices 7

2.1 Warnings and Caution Notices 7

3. Product Description 9

3.1 General Description 9

3.2 Display 9

3.3 Power Supply 9

3.4 Serial In/Out Communications 9

4. Specications 11

5. Installation 13

5.1 Unpacking the Instrument 13

5.2 Dimensions 14

5.3 Pressure Connections 15

5.4 Electrical Connections 16

5.5 Power On 16

6. Local Operation 17

6.1 Keypad 17

6.2 Standard Display 17

6.3 Menu Screens 18

6.3.1 Main Menu Screen 18

6.3.2 Password Entry Screen 20

6.3.3 Sensor Calibration Screen 20

6.3.4 Pressure Units Screens 22

6.4 Menu Tree 23

Operating Instructions CPG2400 Series 3

Digital Pressure Gauge
CPG2400 Series

7. Remote Operation 25

7.1 General 25

7.2 Communication Syntax 25

7.2.1 Password Protection 26

7.2.2 Response String Format 26

7.2.3 CPG2400 Address 26

7.2.4 Wildcard Address Operator(*) 26

7.2.5 Commands and Queries 27

7.2.6 User Programmable Pressure Units 29

7.2.7 Pressure Units Codes and Conversions 30

8. Calibration 31

8.1 Environment 31

8.2 Equipment 31

8.3 Pressure Standard 33

8.4 Calibration Medium 33

8.5 Calibration Process 33

8.5.1 Zero Adjustment 33

8.5.2 Span Adjustment 34

4 Operating Instructions CPG2400 Series

Digital Pressure Gauge
CPG2400 Series

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 one year from the date of shipment. No other express
warranty is given, and no affirmation 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 final as
to all matters concerning 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 specific factory permission, 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 consequential
damages in connection with the furnishing, performance, or use of this material.

1.2 Important Notice

The product specifications and other information contained in this manual are subject to
change without notice.

Mensor has made a concerted effort 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 D-63911 Klingenberg / Germany
Tel: [phone] Tel: [phone]

1.800.984.4200 (USA only) Web Site: www.wika.de
web site: www.mensor.com Fax: [phone]
fax: . [phone] E-Mail: [e-mail]
e-mail: [e-mail]
[e-mail]

Operating Instructions CPG2400 Series 5

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CPG2400 Series

1.3 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.

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 fitness 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
suffered or incurred by the end user (including, but not limited to, general, special,
consequential or incidental damages including damages for loss of business profits,
business interruption, loss of business information and the like), arising from or
in connection with the delivery, use or performance of the software program.

1.4 Mensor Service Plus

If you have problems and you don’t find 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.

1.4.1 After the Warranty

Mensor’s concern with the performance of this instrument is not limited to the warranty
period. We provide complete repair, calibration and certification services after the
warranty for a nominal fee.

1.4.2 Calibration Services

In addition to servicing our own products Mensor can perform a complete pressure
calibration service, up to 20,000 psi, for all of your pressure instruments. This service
includes an accredited calibration.

1.4.3 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 Z540-1­1994 standards.

6 Operating Instructions CPG2400 Series

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CPG2400 Series

2. Safety Notices

2.1 Warnings and Caution Notices

WARNING: NOT EXPLOSION PROOF!

!

Warning

!

Caution

!

Caution

Installation of this instrument in an area requiring devices rated as
intrinsically safe is not recommended.

CAUTION: Some ranges require clean, non-corrosive pressure

media. See “Media Compatibility” in Section 4, Specications. This

instrument is not designed for oxygen use.

CAUTION: Avoid excessive overpressure to the sensor!
Externally mounted relief valves to provide overpressure protection
are available from Mensor as optional devices.

CAUTION: Use of a power supply other than the one provided by
Mensor will invalidate the warranty.

!

Caution

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 notices are found throughout this manual.

Operating Instructions CPG2400 Series 7

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CPG2400 Series

Notes

8 Operating Instructions CPG2400 Series

Digital Pressure Gauge
CPG2400 Series

3. Product Description

3.1 General Description

The CPG2400 is the lowest accuracy single-range pressure measuring instrument
available in the Mensor CPG family. With an uncertainty of 0.03% FS, and a small
package design, this unit is perfect for desk top monitoring of pressure changes and
for use in Production and Test environments. Temperature compensation from 15 to 45
degree C permits use in this temperature range without degradation of accuracy.

The unique design of the CPG2400 has modest features and simple menu options. It
has a standard RS-232 serial output port that can be used for remote communications.
It can display measured pressure along with peaks or null. Other features are a mono­chrome LCD display, null capability, a single silicon sensor and it is powered by a wall
transformer.

Optional features include external dual differential relief valves, externally mounted relief
valves, RS-485 communications (100 ft cable length recommended), and a rack mount
kit.

3.2 Display

Several different display screens are presented while operating the CPG2400. Each
screen is arranged into blocks of information, generally organized into columns and
rows. These screens are each described in further detail in Section 6, “Local Opera­tion”, and in Section 7, “Remote Operation”.

3.3 Power Supply

The power adapter is utilized to provide power to operate the CPG2400. It produces 12
VDC @ 830 mA max.

3.4 Serial In/Out Communications

The serial port can be used to configure and calibrate the CPG2400, or to read the out­put of its sensor. Depending on how your CPG2400 was ordered, the instrument came
with either RS-232 or RS-485 serial port communications. Both are explained below.

The RS-232 serial port is configured as 9600 baud, 8 data bits, 1 stop bit and no parity.
It is designed as a 9-pin DCE device so that a straight pin to pin cable can be used to
connect it to a standard PC serial port.

Operating Instructions CPG2400 Series 9

Digital Pressure Gauge
CPG2400 Series

The RS-485 serial port is configured for 4-wire plus ground connections. The port
operates at 9600 baud, 8 data bits, 1 stop bit and no parity. The device address can
be changed using a remote command. When connecting several units in a multi-drop
configuration, it is recommended that the cable length be limited to 100 ft.

Wiring requirements are provided in Section 5.4, “Electrical Connections”, and a list of
valid commands and responses is provided in Section 7.2.5, “Commands and Queries”.

10 Operating Instructions CPG2400 Series

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CPG2400 Series

4. Specications

Accuracy specifications presented herein are obtained by comparison with primary
standards traceable to the National Institute of Standards and Technology (NIST).
These specifications 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.

Mensor reserves the right to change specifications without notice.

Total Uncertainty Better than 0.03% FS for 180 days.

Calibration Interval 180 days

Pressure Ranges 7.5 to 6000 psia, 0.36 to 6000 psig.

Resolution 5 digits

Overpressure Limit 1.5X

Burst pressure Limit 3X up to 500 psig, 2X greater than 500 psig.

Compensated
Temperature Range

Storage
Temperature Range

Warm-up <1 minute

Reading Rate ~4.6 / second

Response Time <252 mS

Orientation Effects Negligible >30 psi, zero offset resettable with zero cal or null

Communications RS-232 or RS-485 (100 ft cable length recommended) fixed at

Case size 2.6” H x 4.2” W x 4.9” D (see Section 5.2, Dimensions)

Weight <2 lbs.

15 to 45ºC

-20 ... 70ºC

function.

9600 baud, no parity, 8 data bits, 1 stop bit.

Operating Instructions CPG2400 Series 11

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CPG2400 Series

Media
Compatibility

Pressure port: Clean, dry, non-corrosive, non-combustible,
non-oxidizing gases for all rated ranges.
Ranges ≥ 7.5 psi: All other media compatible with aluminum,
316 stainless steel, brass, Buna N, Viton, sealant, silicone
grease and RTV. Not designed for oxygen service. Cannot
guarantee accuracy on media other than gases.
Reference port: Clean, dry, non-corrosive gases.

Power Consumption 12 VDC, .125A

Pressure Interfaces 7/16-20 SAE, Ref: 10-24, 1/8” and 1/4” FNPT adapters

included. 1/16 inch hose barb for reference port.

Warranty One year

Options Relief valves for ranges >100 psi mounted externally.

Rack mount kit.

Pressure Units See Table 7.2.7, “Pressure Units Codes and Conversions”.

Display Monochrome 128 x64 LCD with white LED backlight.

Compliance The CPG2400 is compliant to the following CE Standards:

EN 50081 and EN 50082.

12 Operating Instructions CPG2400 Series

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CPG2400 Series

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 transducer for shipping damage. Report
any apparent damage to the carrier immediately.

In addition to this manual you should have:

• One CPG2400 Digital Pressure Gauge;

• Power adapter;

• Any accessories ordered;

• An envelope containing the Calibration Certificate.

Operating Instructions CPG2400 Series 13

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CPG2400 Series

5.2 Dimensions

Figure 5.2 - Case Outline/Dimensions

14 Operating Instructions CPG2400 Series

Digital Pressure Gauge
CPG2400 Series

5.3 Pressure Connections

The 7/16-20 SAE female NPT threaded port is the pressure input of the CPG2400. If the
sensor range is less than 20 psi and is a gauge or bi-directional sensor, there will also
be a 1/16 inch hose barb fitting above the pressure port. The barb fitting provides ac­cess to the reference port of the sensor.

CAUTION: Avoid excessive overpressure to the sensor!

!

Caution

Externally mounted relief valves to provide overpressure
protection are available from Mensor as optional devices.

Figure 5.3 - Rear view of CPG2400

Operating Instructions CPG2400 Series 15

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CPG2400 Series

5.4 Electrical Connections

For RS-232 serial port operation, connect the CPG2400 to the host computer per
Figure 5.4a. Notice that the host TRANSMIT line is connected to the CPG2400
RECEIVE line (TX to RX), and vice versa.

The power connector is a 2.1 mm standard power jack. The center pin is +12 VDC and
the outside is ground (see Figure 5.4b).

Host

DB-9

Male

2

RX

TX

3

SHLD

5

GND

TX

RX

GND

CPG2400

J1

2

3

5

Female

Figure 5.4a - RS-232 Hookup

For RS-485 serial port operation, connect the CPG2400 to the host computer per
Figure 5.4b.

Host

DB-9

9

Male

RD(A)

1

2

TD(B)

3

TD(A)

RD(B)

GND

5

TD(A)

RD(B)

RD(A)

TD(B)

GND

CPG2400

J1

1

2
3

9

5

Female

Figure 5.4b - RS-485 Hookup

5.5 Power On

After the pressure connections are secure,
press the power switch (

). The CPG2400 will run
through a brief initialization sequence and then will
display a pressure reading.

Figure 5.5 - DC Input

16 Operating Instructions CPG2400 Series

Digital Pressure Gauge

Arrow Keys (4)

The four arrow keys provide navigation
in the menus. They are also used to
adjust the displayed pressure for
calibration adjustment and adjustment
of the programmable user unit.

The "Enter" Key

The key is used as an enter
key to select the highlighted
menu choice or for single
button null.

The "Main Menu" Key

MThe key brings up the main

menu of the DPG2400.

CPG2400 Series

6. Local Operation

6.1 Keypad

A brief description of the keypad features and the display is provided below in Figure

6.1, “Keypad and Display Features”.

The Display Screen

Displays user data and menu setup screens to access
or change various functions. The standard display
screen (shown) provides user information for the pres­sure reading and engineering pressure unit.

CPG2400

Figure 6.1 - Keypad and Display Features

6.2 Standard Display

When the CPG2400 is powered on,
a pressure reading will be displayed
after the initialization screen.

Arrows Keys (4)

The four arrow keys provide navigation in
the menus. They are also used to adjust the
displayed pressure for calibration adjust­ment and adjustment of the programmable
user unit.

The “Enter” Key

The ◆ key is used as an enter key

to select the highlighted menu
choice or for single button null.

The “Main Menu” Key

The M key brings up the main
menu of the CPG2400.

Power Switch

This key is the power on/o

switch.

Figure 6.2 - Display Screen (standard)

Operating Instructions CPG2400 Series 17

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CPG2400 Series

6.3 Menu Screens

All the menu screens can be navigated by use of the arrow keys. To select a menu item,
highlight the item and press the ♦ (enter) key.

6.3.1 Main Menu Screen

If the M (menu) key is pressed at any time, the main menu is displayed:

A Setup

Peak Off Peak Rst

Null Off Cal

Units Sensor A

The items in this menu perform the following functions when selected:

Peak O (On): Toggles the peak indicator.

A Setup

Peak On Peak Rst

Null Off Cal

Units Sensor A

The current state of the peak indicator is highlighted. If
the menu item displays “Peak Off”, the peak indicator
is disabled. If “Peak Off” is selected, it will enable peak
capture. If the Sensor Setup menu is re-entered, the
menu item will display “Peak On” to indicate that the
peak capture function is enabled.

The peak indication screen will display current, maxi­mum, and minimum pressures. The instrument will con­tinuously update the peaks until “Peak Rst” is selected.

Peak Reset: Resets the peak values to the current measured pressure.

A Setup

Peak On Peak Rst

Null Off Cal

Units Sensor A

18 Operating Instructions CPG2400 Series

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CPG2400 Series

Null O (On): Toggles the null function.

A Setup

Peak Off Peak Rst

Null On Cal

Units Sensor A

The current state of the null function is displayed. If the
menu item displays “Null Off”, the null function is dis­abled. If “Null Off” is selected, the CPG2400 will subtract
the current measured pressure from any subsequent
pressure readings. A capital “N” appears just above the
“A” on the main operation screen to indicate that the
sensor is currently using a null offset.

Single button null: The null feature can also be accessed by pressing the ♦ (enter) key
while at the standard display. The null button will toggle nulling on or off. The instrument
will revert to the un-nulled state if power is cycled.

1. Peak and Null functions can be used simultaneously.

2. Pressure units must not be changed when using the null feature.

Cal: Displays the calibration password entry screen.

A Setup

Peak Off Peak Rst

Null Off Cal

Units Sensor A

Sensor A Calibration

Password Entry

Enter to Continue

Units: Displays the first of the three pressure units screens.

PSI InHg 0c

InHg 60f InH20 4c

InH20 20c mBAR

BAR more

Sensor A: Returns to sensor display.

A Setup

Peak Off Peak Rst

Null Off Cal

Units Sensor A

Operating Instructions CPG2400 Series 19

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CPG2400 Series

6.3.2 Password Entry Screen

If the calibration function is selected from the sensor setup screen, the password entry
screen will be displayed:

Sensor A Calibration

Password Entry

The 4-digit password can be entered by moving the
cursor with the left and right arrow keys under the
digit to be changed and then pressing the up or down

Enter to Continue

arrow keys to scroll through the numbers 0 to 9. When
the password is entered, press the ♦ (enter) key. The
calibration screen will be displayed.

6.3.3 Sensor Calibration Screen

The sensor calibration screen allows the zero and span to be adjusted, the calibration to
be reset to the factory defaults, and the calibration password to be changed.

A Calibration

Cal Zero Cal Span

Change PW Reset Cal

The items in the calibration menu perform the following functions when selected:

Cal Zero: Displays the currently measured pressure.

A Calibration

Cal Zero Cal Span

Change PW Reset Cal

Adjust the digits to the true pressure applied to the
sensor and press the ♦ (enter) key to store the value.
For more details, see Section 8, Calibration.

Cal Span: Displays the measured pressure for the active sensor.

A Calibration

Cal Zero Cal Span

Change PW Reset Cal

20 Operating Instructions CPG2400 Series

Adjust the digits to the true pressure applied to the
sensor and press the ♦ (enter) key to store the value.
For more details, see Section 8, Calibration.

Digital Pressure Gauge
CPG2400 Series

Change PW:

A Calibration

Cal Zero Cal Span

Change PW Reset Cal

Sensor A Calibration

Password Entry

Enter to Continue

Move the cursor with the left and right arrow keys under the digit to be changed. Incre­ment the digit with the up arrow key and decrement the digit with the down arrow key.
When the password has been changed, press the ♦ (enter) key to store it. The main
menu is then displayed.

The password is set to “0000” at the factory. When making a change
write it down and save the number. If the password is lost contact
Mensor.

Reset Cal: Displays a confirmation screen.

A Calibration

Cal Zero Cal Span

Change PW Reset Cal

Reset Calibration

Sensor A

Are you Sure?

Enter to Reset

Other Keys to Quit

If the ♦ (enter) key is pressed, the calibration is reset to the factory defaults and the
main operation screen is displayed. If any other key is pressed, the main menu screen is
displayed.

Operating Instructions CPG2400 Series 21

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6.3.4 Pressure Units Screens

Pressure units must not be changed when using the null feature.

There are three screens that allow selection of the most common pressure units:

PSI InHg 0c

InHg 60f InH20 4c

InH20 20c mBAR

BAR more

mmHg 0c cmHg 0c

Pa hPa

kPa MPa

kg/cm^2 more

cmH20 4c cmH20 20c

MSW User

Set User more

The pressure unit of the sensor is selected by highlighting the desired unit and
pressing the ♦ (enter) key. To advance to the next units screen, select “more”. The last
units screen allows selection and entry of a special “User” unit. The User unit has a
configurable conversion factor that converts from PSI to the desired value. To enter the
conversion factor, select “Set User” on the last units screen to display:

Set User Units A

+1.00000e+1

Enter to Continue

Use the left and right arrow keys to move the cursor under the digit to change and use
the up and down arrow keys to increment or decrement the digit. The conversion factor
can be set from -1.00000e+6 to -1.00000e-6 and +1.00000e-6 to +1.00000e+6. Press
the ♦ (enter) key to store the conversion factor. To apply the “user” conversion factor,
the units “User” must be selected.

For the remote programmable pressure units list and information, see
Section 7.2.6, User Programmable Pressure Units.

22 Operating Instructions CPG2400 Series

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CPG2400 Series

6.4 Menu Tree

Figure 6.4 - CPG2400 Menu Tree

Operating Instructions CPG2400 Series 23

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CPG2400 Series

Notes

24 Operating Instructions CPG2400 Series

Digital Pressure Gauge
CPG2400 Series

7. Remote Operation

7.1 General

The CPG2400 can be operated from a remote computer which communicates over an
RS-232 (standard) or RS-485 serial port. The serial port can be used to configure and
calibrate the CPG2400, or to read the output of its sensors. This section of the manual
provides information on the serial port configuration, explains the command conven­tions used in this manual, and lists the common commands and queries which are
recognized by the CPG2400.

7.2 Communication Syntax

All commands and responses are in ASCII characters; lower and upper case are in­terpreted the same. Every command or query begins with the pound symbol (#). The
question mark (?) character is significant to the CPG2400. All other punctuation charac­ters are ignored. Some commands require a password string. A carriage return (<cr>) or
linefeed (<lf>) must terminate each command or query. The global address character is
an asterisk (*). It can be sent in place of the actual CPG2400 address. See Table 7.2 for
“Command Conventions” and Table 7.2.5 for “Command Set”.

Table 7.2 - Command Conventions

Conven­tion

X Address (single character 0 through 9 or A through Z; case insensitive)

* Global address character

? Query operator

<sp> Space ( )

n One character place holder for digit or decimal point

n...n Variable length field

R Ready response

Operating Instructions CPG2400 Series 25

Description

Digital Pressure Gauge
CPG2400 Series

7.2.1 Password Protection

Certain commands require a password to be sent before a setting is changed. The
password is only effective for the next command, so the password must be sent
immediately before any password protected command string. The password string is
the password set in the CPG2400. The password is set at the factory to “0000”.

7.2.2 Response String Format

All strings sent by the CPG2400 are terminated by a carriage return <cr> and linefeed
<lf>. The CPG2400 will return an “R” character (ASCII 82) to indicate that it has received
a valid command or password rather than a query. If an invalid command or password
is sent, the “R” character will not be returned. When communicating with the CPG2400,
the “R” character must be received before sending additional commands or queries.
In the event that an invalid command could be sent, a timeout period of approximately
one second should be used before sending the next command or query.

The full command word is shown in Table 7.2.5 “Command Set” in all capital letters.
Other conventions used to describe commands are shown in Table 7.2 “Command
Conventions”.

7.2.3 CPG2400 Address

Each CPG2400 is assigned address “1” at the factory. In a multiple unit system each
device must have a unique address. Valid addresses are 0 through 9 and A through Z
(upper and lower case are interpreted the same). The “A” command is used to change
the address.

7.2.4 Wildcard Address Operator (*)

In addition to the 36 unique addresses available, an asterisk (*) functions as a wildcard
address operator. However, the wildcard must not be used in queries if more than one
device is connected to the RS-485 port.

26 Operating Instructions CPG2400 Series

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7.2.5 Commands and Queries

i

Each command that changes a parameter is volatile until the SAVE com­mand is issued.

Notice

Table 7.2.5 - Command Set

Pass-

word

Protect

No ? #X?<cr><lf> The return string from a pressure reading query”?” can

No A #XA<sp>n<cr><lf> R Sets address of CPG2400 to 0-9

No CPW #XCPW<sp>nn

No DC? #XDC?<cr><lf> X<sp>DC<sp>nn

Yes DC #XDC<sp>nnnnnn

No FL? #XFL?<cr><lf> X<sp>FL<sp>nn Returns the filter percentage.

No FL #XFL<sp>nn

No FS? #XFS?<cr><lf> X<sp>FS<sp>nnnnn Returns the CPG2400 accuracy.

Command

/ Query

Command String Return String Description

have different formats dependent upon how the unit is set
up.

If the peak function is disabled, the return string will
only contain the current pressure reading. An example
of a normal return string: 1 +14.584<cr><lf> where 1 =
address, +14.584 = pressure reading, and <cr><lf> =
termination.

If the peak function is enabled, the return string will
contain three values. The first value is the maximum
pressure, the second is the present pressure and the third
is the minimum pressure. An example of a return string
with “peak on”: 1 +14.595,+14.584,+14.575<cr><lf>
where 1 = address, +14.595,+14.584,+14.575 = pressure
readings, and <cr><lf> = termination.

or A-Z.

nn<cr><lf>

<cr><lf>

<cr><lf>

R Enter customer password.

nnnn

R Loads the date of calibration

R Sets the filter percentage ranges

Returns the date of calibration
where nnnnnn is mmddyy.

where nnnnnn is mmddyy.

from 0 to 99.

Operating Instructions CPG2400 Series 27

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CPG2400 Series

No ID? #XID?<cr><lf> X<sp>ID<sp>nn

No NULL? #XNULL?<cr><lf> X<sp>NULL<sp>n Returns mode status for null

No NULL #XNULL<sp>n<cr>

<lf>

No PEAK? #XPEAK?<cr><lf> X<sp>PEAK<sp>n Returns mode status for peak

No PEAK #XPEAK<sp>n

<cr><lf>

No R-? #XR-?<cr><lf> X<sp>R-<sp>nnnnn Returns minimum pressure range

No R+? #XR+?<cr><lf> X<sp>R+<sp>nnnnn Returns maximum pressure

No RST<sp> #XRST<sp><cr>

<lf>

No SAVE #XSAVE<cr><lf> R Saves all data to memory.

No SC? #XSC?<cr><lf> X<sp>SC<sp>nnn

Yes SC #XSC<sp>nnnnnn

<cr><lf>

Yes SCPW #XSCPW<sp>nnnn

<cr><lf>

No T? #XT?<cr><lf> X<sp>T<sp>n Returns the pressure type;

No U? #XU?<cr><lf> X<sp>U<sp>nn Returns pressure units code.

No U #XU<sp>nn<cr><lf> R Sets the units code.

No USR? #XUSR?<cr><lf> X<sp>USR<sp>nn

No USR #XUSR<sp>n

<cr><lf>

MENSOR,<sp>nnnn
64nn,<sp>nnnnnnnn,
<sp>Vn.nn

R Sets null mode

R Sets peak mode

R Resets peak values. A space

nnnn

R Sets the span correction

R Changes the password.

nnnnnnnennnn

R Sets user selected units.

Returns the CPG2400 ID string.

where n = 0 = OFF, n = 1 = ON.

where n = 0 = OFF, n = 1 = ON.

capture where n = 0 = OFF,
n = 1 = ON.

where n = 0 = OFF, n = 1 = ON.

in PSI.

range in PSI.

must be included after the RST
command.

Returns the span correction
multiplier.

multiplier.

A = Absolute, G = Gauge,
B = Bi-directional.

See Table 7.2.7.

Returns the user unit multiplier.

Ranges from -1.00000e+6 to

-1.00000e-6 and +1.00000e-6 to
+1.00000e+6.

28 Operating Instructions CPG2400 Series

Digital Pressure Gauge
CPG2400 Series

No UT? #XUT?<cr><lf> X<sp>UT<sp>n,

No UT #XUT<sp>n<sp>

N<cr><lf>

No ZC? #XZC?<cr><lf> X<sp>ZC<sp>nn

Yes ZC #XZC<sp>nnnnnn

<cr><lf>

<sp>n,<sp>n,...
<cr><lf>

R Loads the programmable units

nnnnn

R Sets the zero offset.

Returns the list of programmed
pressure units.

list. The first number is the se­quential position in the list from
0 to 7 and the second number
is the unit code as according to
Table 7.2.7.

Returns the zero offset.

7.2.6 User Programmable Pressure Units

The remote command UT can be used to modify the default pressure units available on
the units display screen. The user can select from one to eight units to be displayed by
sending a sequence of “UT” commands. The syntax is as follows:

#*UT<sp>n<sp>n<cr><lf> where the first “n” is a value from 0 to 7 and represents the
units sequential position in the displayed list. The second “n” represents the unit code
from Table 7.2.7. If the first (0) unit in the sequence is assigned a value of “0” then the
displayed units will default to all the available units from the factory. To display less than
eight units, a “0” is assigned to the next unit in the sequence.

An example of the use of the “UT” command:
#*UT 0 1<cr><lf> - assigns the first unit displayed as PSI
#*UT 1 2<cr><lf> - the next unit displayed would be InHg 0C
#*UT 2 34<cr><lf> - the third unit displayed would be hPa
#*UT 3 0<cr><lf> - terminates the displayed units to this point
#*UT 0 0<cr><lf> - allows all factory units to be displayed and used

The “SAVE” command must be sent to make changes permanent.

Operating Instructions CPG2400 Series 29

Digital Pressure Gauge
CPG2400 Series

7.2.7 Pressure Units Codes and Conversions

Table 7.2.7 - Pressure Units Codes and Conversions

Code Pressure Unit PSI Conversion Factor

0 Counts N/A

1 PSI 0

2 InHg 0C 2.03602

3 InHg 60F 2.041772

4 InH2O 4C 27.680672

5 InH2O 20C 27.729767

14 Bar 0.06894757

15 mBar 68.94757

17 cmH2O 4C 70.3089

19 mmHg 0C 51.71508

20 cmHg 0C 5.171508

22 kPa 6.894757

23 Pa 6894.757

26 kg/cm2 0.07030697

27 MSW 0C (@3.5% salinity) 0.6838528

34 hPa 68.94757

36 MPa 0.006894757

38 cmH2O 20C 70.4336

99 User User Settable

30 Operating Instructions CPG2400 Series

Digital Pressure Gauge
CPG2400 Series

8. Calibration

The CPG2400 automatically adjusts the pressure readings for the effects of temperature
within the calibrated range (see Section 4, Specifications). Thus, a calibrated CPG2400
operated within its temperature band, and with proper zero and span settings, will pro­vide accurate pressure measurements.

The transducer should have the span verified periodically to insure its stability. Initially,
the recommended period between calibrations is as specified. This period may be ex­tended as confidence is gained in the span stability.

8.1 Environment

Whenever possible, calibrate the CPG2400 at the same ambient temperature as
its normal operating environment. The temperature should be stable and within the
specified calibration range. In addition, for maximum accuracy, see that the CPG2400 is
at rest on a stable platform which is free of vibration and shock, and oriented similar to
its operating attitude.

8.2 Equipment

The following equipment is needed to calibrate a gauge transducer (see Figure 8.2):

1. A pressure source with a line-pressure regulator to cover the full scale pressure

range of the CPG2400.

2. A hand operated variable-volume pressure vernier (volume controller).

3. A metering valve and two isolating valves for Vent and Supply Pressure.

4. A pressure calibration standard.

5. Tubing and fittings adequate for the pressure range.

Additional equipment required to calibrate sub-atmospheric transducers (absolute,
vacuum or bi-directional pressure types) is illustrated in Figure 8.2. These items are:

6. A vacuum pump capable of pumping down to 300 millitorr.

7. A vacuum standard to measure pressures down to 300 millitorr.

8. One additional valve to isolate the vacuum line.

Operating Instructions CPG2400 Series 31

Digital Pressure Gauge
CPG2400 Series

PRESSURE

SUPPLY

PRESS

PRESSURE
STANDARD

LINE
REGULATOR

VOLUME

CONTROLLER

SHUT-OFF

VALVES

METERING

VALVE

DIAPHRAGM TYPE

VACUUM GAUGE

SHUT-OFF

VALVES

VENT

Setup for Absolute Pressure

SHUT-OFF

VALVES

PRESSURE

NOTE: DISCONNECT WHEN VACUUM

GAUGE RANGE IS EXCEEDED

VAC

VENT

Setup for Gauge or Differential Pressure

VENT

VACUUM

Computer
(optional)

CPG2400

PRESSURE GAUGE

RS-232

or

RS-485

PRESSURE

SUPPLY

LINE

PRESS

PRESSURE
STANDARD

REGULATOR

VOLUME

CONTROLLER

REF

METERING

VALVE

PRESSURE

REFERENCE

VENT

SHUT-OFF
VALVE

ATMOSPHERE

Computer
(optional)

CPG2400

PRESSURE GAUGE

RS-232

or

RS-485

Figure 8.2 - Calibration Setup

32 Operating Instructions CPG2400 Series

Digital Pressure Gauge
CPG2400 Series

8.3 Pressure Standard

Mensor recommends the use of appropriately accurate primary pressure standards
when calibrating this instrument. Such standards should be sufficient so that when
the techniques of the ISO Guide to the Expression of Uncertainty in Measurement
(GUM) are applied, the instrument meets its accuracy statements as required by ISO/
IEC 17025:2005, or other applicable standards. The same requirement applies to the
vacuum gauge used to set the zero offset on absolute calibrations. The recommended
absolute pressure level for setting the zero offset is ≥ 300 millitorr.

8.4 Calibration Medium

The recommended calibration medium for instrument ranges up to 2500 psi is dry
nitrogen. Hydraulic media (water or oil for example) are recommended for ranges above
2500 psi. Hydraulic media can be used with some lower range instruments. However,
special techniques must be used in filling the connection lines and pressure port.

8.5 Calibration Process

The calibration process described below is for local operation via the instrument key­pad. Connect the CPG2400 sensor to be calibrated as shown in Figure 8.2, Calibration
Setup.

When the Calibration function is selected from the sensor setup screen, the password
entry screen will be displayed. Enter the 4-digit password and then press the ♦ (enter)
key. For more information on entering or changing the password, see Section 6, Local
Operation.

8.5.1 Zero Adjustment

Access the zero calibration screen as described in Section 6, Local Operation.

For a gauge sensor: Vent the CPG2400 and adjust the display to show zero pressure by
using the arrow keys on the front panel. When zero is shown, press the ♦ (enter) key.

For an absolute sensor: Connect a vacuum source to the pressure port of the instru­ment. Apply a vacuum to the port and maintain a viscous flow, typically 300 millitorr, or
greater. (At pressures lower than 300 mTorr, the actual pressure at any particular point in
the system becomes undeterminable.) Allow sufficient time for the applied pressure to
stabilize and adjust the measured pressure on the zero calibration screen to match the
applied pressure. Press the ♦ (enter) key to store the zero offset.

For a bi-directional sensor: Apply a negative pressure source equal to R-.

Operating Instructions CPG2400 Series 33

Digital Pressure Gauge
CPG2400 Series

8.5.2 Span Adjustment

Access the span calibration screen as described in Section 6, Local Operation.

Apply a known pressure to the pressure port of the instrument to be calibrated equal to,
or slightly less than the range of the instrument. The applied pressure must be greater
than 50% of the span or span adjustments will not be accepted. Adjust the measured
pressure on the span calibration screen to match the true applied pressure. Press the
♦ (enter) key to store the span offset data.

34 Operating Instructions CPG2400 Series

Digital Pressure Gauge
CPG2400 Series

Notes

Operating Instructions CPG2400 Series 35

Mensor

201 Barnes Drive
San Marcos, Texas 78666
Phone: [phone]
Fax: [phone]
Web site: www.mensor.com
email: [e-mail]

Operating Instructions CPG2400 PN 0017460001S • 10/2014

WIKA Alexander Wiegand SE & Co. KG

Alexander-Wiegand-Straße 30
D-63911 Klingenberg / Germany
TEL: [phone]
WEB SITE: www.wika.de
FAX: [phone]
E-MAIL: [e-mail]