Bulletin P-A-435-A
A
n option for Magnesense
®
I
I Differential Pressure Transmitter models that do not
h
ave a display would be to use a Model A-435-A remote display tool which can plug
i
nto the connector shown in Figure 1. The remote display tool has two buttons that
function identically to the buttons on the PCB.
Figure 1
CALIBRATION
Zero Calibration
The zero calibration can be set by applying zero pressure to both the pressure
ports and pressing the zero button for 3 seconds. The display will read ZEro 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.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P
.O.
BOX
373
•
MICHIGAN
CITY
,
INDIANA 46360,
U.S.A.
Fax:
219/872-9057
e-mail:
[email protected]S
PAN Calibration
T
he span calibration can be adjusted only after setting the zero adjustment. It must
b
e completed within 5 minutes of the last zero calibration. The span calibration
button will be ignored until the zero calibration is completed. Apply pressure to the
ports of the transmitter that is associated with the maximum output of the
transmitter (20 mA, 5 V, or 10 V depending on output being used). Press and hold
the span button for 3 seconds. The display will read SPAn and then sequence back
t
o the home display. If the span calibration is attempted before adjusting the zero
calibration, the FAIL error message will flash on the display. For bi-directional
ranges, separate spans can be performed for positive and negative sides of the
range. A failure will also occur if the span operation is performed too closely to the
z
ero point pressure.
D
isplay Error Messages
ovEr = 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.
Specifications - Installation and Operating Instructions
Model A-435-A Remote Display Tool
Access
Security
Level
0
1
2
3
Setting
000
111
222
333
View
Menu
Yes
Yes
No
No
Edit
Menu
Yes
No
No
No
Span
Yes
No
No
No
Zero
Yes
Yes
Yes
No
There is a 5 second delay from the time the zero or span
calibration buttons is released until the time that the change in
calibration takes place. 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
(8 pages)
(4 pages)
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