Dwyer instruments A-435-a User manual

Model A-435-A Remote Display Tool

Specications - Installation and Operating Instructions

Bulletin P-A-435-A

An option for Magnesense®II Differential Pressure Transmitter models that do not

have a display is to use a Model A-435-A Remote Display Tool which can plug into

the connector shown in Figure 1. The remote display tool has two buttons that function

identically to the buttons on the PCB.

CALIBRATION

Zero Calibration

In order to apply the zero calibration, vent both pressure ports to atmosphere or apply

equal pressure to both ports then press the zero button for 3 seconds. The display will

read 2Ero and then sequence back to the home display. If the current reading is not

close enough to zero (±2%), the operation will fail and FAIL will be displayed.

SPAN Calibration

The span calibration can only be adjusted after completing the zero calibration. It

must be completed within 5 minutes of the last zero calibration. The span calibration

button will be ignored until the zero calibration is completed. Apply the maximum full-

scale pressure value, indicated by the DIP switch setting, to the positive pressure port

(i.e. the pressure value corresponding to 20 mA, 5 V, or 10 V depending on selected

output). Press and hold the span button for 3 seconds. The display will read SPAn and

then sequence back to the home display. If the span calibration is attempted before

adjusting the zero calibration, the FAIL error message will ash on the display. A failure

will also occur if the span operation is performed too closely to the zero point pressure.

Display Error Messages

ouEr = The applied pressure is greater than the maximum span value causing an Over

Range Error.

UndEr = The applied pressure is less than the minimum span value causing an Under

Range Error.

FAiL = When the span or zero buttons are pressed, the pressure value is out of the

range to allow a correct setting. This may be due to a sensor failure or incorrect

pressure being applied.

Err1 = The sensor is damaged.

-rErr = Negative display value too low to display.

PROGRAMMING MENUS

Home Menu

During normal operation, the display will be in the Home Menu and will display the

current measured pressure and the engineering units.

Menu Access Security

While in the Home Menu, press and hold the Zero and Span buttons simultaneously

until SECUr appears on the display in order to access the other programming menus.

Upon releasing the buttons, the display will indicate the current security level.

If the current security level is the security level desired (i.e. Security Level 0), press

and hold the span button for three seconds to enter the Pressure, Velocity, or Air Flow

Menu.

If the security level is not the desired level, the security level can be changed

temporarily to a lower security level or permanently to a higher level of security by

pressing the zero button. A security code will be shown on the display and it can be

changed to one of the codes listed in the below table. The span button chooses which

digit and the zero button increments the value of that digit. Pressing and holding the

span button will store the value.

The level of access to the programming menus and the calibration is limited based on

the security level. The above table details the level of access for each security level.

Security

Level Setting

Access

View Menu Edit Menu Span Zero

000

111

222

333

Yes

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219-879-8000

Fax: 219-872-9057

www.dwyer-inst.com

e-mail: [email protected]

Once the zero or span calibration button is released, there is a 5

second delay before the change takes effect. This delay is used to

prevent stress related offsets on the lower ranges.

NOTICE

The security level that is set in the Programming Menu Section

of the manual will determine which calibrations, if any, may be

adjusted by the user.

NOTICE

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Mode Selection / Digital Dampening Menu

From the home display, pressing the span and zero button simultaneously for 3

seconds will access the Menu Security Level. If the level is set to 0 or 1, pressing and

holding the span button for 3 seconds a second time will access the Mode Selection

Menu. The display will default to Pressure when rst powered up. Pressing the zero

button will cycle to Velocity and Flow.

Once the desired Mode is displayed, pressing and holding the span button for three

seconds will save the selected mode and display the digital dampening or averaging

parameter. This parameter stabilizes the output and the display by averaging the

readings. There are 2.5 readings taken each second and the user can select the

number of seconds that they would like to average up to 240 seconds. The display and

the output will continue to update at a rate of 2.5 updates per second, but the moving

average is used for these updates.

PRESSURE MODE

Maximum Output Adjustment

If the Pressure Mode was selected, pressing and holding the span after adjusting the

digital dampening will enter the Pressure Mode. In this menu, the maximum output

pressure (POH) can be adjusted to any pressure between the lowest dip switch range

to the highest dip switch range. If the dip switch settings are preferred over manually

setting the range, the POH parameter can be set to off.

VELOCITY MODE

K-Factor Adjustment

If the Velocity Mode was selected, pressing and holding the span after adjusting the

digital dampening will enter the Velocity Mode and the transmitter will display the

engineering unit that has been selected by the dip switch. Pressing and holding the

span button for three seconds will enter the K – Factor adjustment. The K – Factor

can be adjusted between 0.001 to 9.999. The K-Factor can be adjusted by pressing

the span button to select the digit and pressing the zero button to increment the value

of the digit. Pressing and holding the span button for three seconds will enter the

Maximum Output Adjustment parameter.

Maximum Output Adjustment

The maximum output can be equivalent to a velocity or a pressure. After adjusting

the K-Factor, the display will indicate if the adjustment is set for pressure or velocity.

Pressing the zero button will toggle between the selections. Pressing and holding

the span button for three seconds will enter the maximum output adjustment. The

maximum output can be adjusted by pressing the span button to select the digit and

pressing the zero button to increment the value of the digit. Pressing and holding the

span button for three seconds will save this value and go to the Security Update Menu.

FLOW MODE

K-Factor Adjustment

If the Flow Mode was selected, pressing and holding the span after adjusting the digital

dampening will enter the Flow Mode and the transmitter will display the engineering

unit that has been selected by the dip switch. Pressing and holding the span button for

three seconds will enter the K – Factor adjustment. The K – Factor can be adjusted

between 0.001 to 9.999. The K-Factor can be adjusted by pressing the span button

to select the digit and pressing the zero button to increment the value of the digit.

Pressing and holding the span button for three seconds will enter the Area Adjustment

parameter.

Area Adjustment

For Flow applications, the area is multiplied by the velocity to determine the volumetric

air ow. The area will be listed in either feet or meters depending on the dip switch

settings. The units will be indicated on the display at the time of adjustment.The area

can be adjusted by pressing the span button to select the digit and pressing the zero

button to increment the value of the digit. Pressing and holding the span button for

three seconds will enter the Maximum Output Adjustment parameter.

Maximum Output Adjustment

The maximum output can be equivalent to a ow or a pressure. After adjusting the

Area parameter, the display will indicate if the adjustment is set for pressure or ow.

Pressing the zero button will toggle between the selections. Pressing and holding

the span button for three seconds will enter the maximum output adjustment. The

maximum output can be adjusted by pressing the span button to select the digit and

pressing the zero button to increment the value of the digit. Pressing and holding the

span button for three seconds will save this value and go to the Security Update Menu.

Security Update / Save Changes Menu

The Security Update Menu allows the security level to be set either higher or lower

than the current security level setting. This security level will be displayed the next

time the Menus are accessed from the home screen. Pressing the zero button cycles

through the security levels. Pressing and holding the span button for three seconds

accepts the new security level and gives the option to save all the menu changes.

Pressing the zero button will toggle between yes and no. Yes will save the changes

made to all menu items and no will discard all the changes made to all menu items. If

the display is set to yes, pressing and holding the span will save the menu items and

return the display to the Home Position.

FACTORY DEFAULT PROCEDURE

In order to reset all of the menu settings back to their factory programmed values,

press and hold both the span and zero buttons simultaneously for 10 seconds until

FACt is displayed on the LCD. Upon releasing the buttons, the unit will be factory

defaulted. Since resetting the transmitter will wipe out all changes, it is necessary to

zero (and possibly span) the transmitter before taking measurements.

MAINTENANCE/REPAIR

Upon nal installation of the A-435-A, no routine maintenance is required. The A-435-A

is not eld serviceable and it is not possible to repair the unit. Field repair should not

be attempted and may void warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact

customer service to receive a Return Goods Authorization number before shipping the

product back for repair. Be sure to include a brief description of the problem plus any

additional application notes.

APPENDIX I

Air Velocity / Air Flow Calculations

Velocity is calculated using the below equation:

Velocity(fpm) = K-Factor x 4004.4 x √(Diff. Press. (in of w.c.)

Velocity in m/s is then calculated from the equation:

Velocity(m/s) = Velocity(fpm) x 0.00508

Flow is calculated using the below equation:

Flow(cfm) = Area(Ft2) x K-Factor x 4004.4 x √(Diff. Press. (in of w.c.)

Flow (m3/h) = Flow (cfm) x 1.6992

APPENDIX II

Maximum Flow

Range

in w.c.

Max Displayed Flow Max (K Factor x Area)

CFM M3/H CFM Mode M3/H Mode

0.5

5885000

9999000

2037.2

644.2

272.2

154.5

59.9

25.3

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APPENDIX III

Quick Start Guide

MENU FLOW CHART

ZERO

SPAN

ZERO

SPAN

ZERO

SPAN

ZERO

SPAN

ZERO

SPAN

BUTTON

PRESS

LEGEND

=PRESS

PRESS

ZERO

BUTTON

=PRESS

PRESS

SPAN

BUTTON

=PRESS

PRESS

AND

HOLD

ZERO

BUTTON

=PRESS

PRESS

AND

HOLD

SPAN

BUTTON

=PRESS

PRESS

AND

HOLD

ZERO

AND

SPAN

BUTTONS

CONVENTIONS

ENTER

DISPLAY

HOME

POSITION:

CALIBRATE

UNIT

ZERO

PRESSURE.

CALIBRATE

UNIT

SPAN

PRESSURE.

DISPLAY:

SEQUENCES

MAIN

ITEM,

AND

ITEM

CHANGED

TEMPORARILY

SAVES

THE

SELECTION

SEQUENCES

THROUGH

SUB

SELECTIONS

INCREMENTS

DIGITS

DISPLAY

NOT

NECESSARY

SEQUENCE

DIGIT.

ACTIVE

DIGIT

WILL

BLINK.

HOME

POSITION

FACTORY

SETTINGS

RESTORED,

THEN

RETURNS

HOME

POSITION

HOLD

SECONDS

HOME

POSITION

WHEN

BUTTONS

ARE

RELEASED

DISPLAYS

CURRENT

SECURITY

LEVEL

WHILE

BUTTONS

ARE

PRESSED

CHANGE

SECURITY

LEVEL

=BLINKING

BLINKING

DIGIT

SECURITY

LEVEL

SETTING

000

111

222

333

SECURITY

SET

0,1,

SECURITY

SET

PRESS

ANY

KEY

WAIT

SECONDS

SECURITY

LEVEL

SELECTION

MODE

SELECTION

PRESSURE,

VELOCITY,

FLOW

ADJUST

AVERAGING

SELECT

MODE

INCREMENT

DIGIT

INCREMENT

DIGIT

SELECT

DIGIT

SELECT

DIGIT

TO "

PRESSURE,

VELOCITY,

FLOW

FLOW "

MENUS

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PoH

SPAN

SPAN SPAN

SPAN

FROM

AVERAGING

PRESSUREPRESSURE MODEMODE MENUMENU

ADJUST

PRESSURE

OUTPUT

HIGH

UPON

RELEASE

SET

PoH

DESIRED

VALUE

PoH

=DIP

DIP

SWITCH

FULL

SCALE

SETTING

288

ZERO

SPAN

INCREMENT

DIGIT

SELECT

DIGIT

UNITS

SET

DIP

SWITCH

WILL

BLINK

THIS

DEPENDS ON

DIP

SWITCH

SETTING

TO " UPDATE

UPDATE

SECURITY

AND

SAVE

"MENU

ZERO

AdJ

FROMFROM

MENUS

uoH

SPAN

FROM

AVERAGING

VELOCITY

MODE

ADJUST

VELOCITY

OUTPUT

HIGH

UPON

RELEASE

UPON

RELEASE

UPON

RELEASE

ZERO

SPAN

INCREMENT

DIGIT

INCREMENT

DIGIT

SELECT

DIGIT

SELECT

DIGIT

UPDATE

SECURITY

ANDAND SAVESAVE "MENUMENU

0233

AdJ

diSP

d1000

UnIt

SELECTED

UNITS

DISPLAYED

UNITS

SELECTED

DIP

SWITCH

SETTING

ADJUST

DISPLAY

FACTOR

SELECT

MAXIMUM

OUTPUT

SET

BY PRESSURE

PRESSURE

VELOCITY

FPM

M/S

BASED

DIP

SWITCH

SETTING

PoH

PRESSUREPRESSURE

MODE

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SPAN

FROM

AVERAGING

FLOWFLOW MODEMODE MENUMENU

SELECTED

UNITS

DISPLAYED

UNITS

SELECTED

DIP

SWITCH

SETTING

ARE

SPAN

UPON

RELEASE

SQ.

FEET

SQ.

METERS

BASED

DIP

SWITCH

SETTING

ZERO

SPAN

INCREMENT

DIGIT

SELECT

DIGIT

SPAN

ADJUST

FLOW

OUTPUT

HIGH

UPON

RELEASE

UPON

RELEASE

UPON

RELEASE

ZERO

SPAN

INCREMENT

DIGIT

INCREMENT

DIGIT

SELECT

DIGIT

SELECT

DIGIT

"UPDATE

UPDATE

SECURITY

AND

SAVE

"MENU

ADJUST

DISPLAY

FACTOR

SELEC

SELECT

MAXIMUM

OUTPUT

SETSET

PRESSURE

FLO

FLOW

FPM

OR M/S

M/S

BASED

DIP

SWITCH

SETTING

PoH

PRESSUREPRESSURE

MODE

SAuE

YES

SEC

FROM

UPDATE

SECURITY

AND

SAVE

UPDATE

SECURITY

LEVEL

SAVE

CHANGES

ZERO

SPAN

UPON

RELEASE

0.0

HOME

POSITION

UnIt

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NOTES

__________________________________________________________________________________________________________________________________________

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219-879-8000

Fax: 219-872-9057

www.dwyer-inst.com

e-mail: [email protected]

All manuals and user guides at all-guides.com

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