Dwyer MS2 - Manual (Page 4)

Setting the Engineering Units
Magnesense
® II comes with the selection of four engineering units (in w.c., Pa, mm
w.c., or kPa). The engineering units are selected using DIP Switch 4 and 5. The
units will be displayed on the optional LCD display.
Setting the Output Voltage Range
Voltage output can be either 0 to 10 V or 0 to 5 V depending on the position of DIP
Switch 6.
• When the switch is in the ON position, the output will be 0 to 10 V
• When the switch is in the OFF position, the output will be 0 to 5 V
Setting the Input / Output action
The output will either directly or indirectly follow the input based on the position of
DIP Switch 7.
• When the switch is in the ON position, the output directly follows the input (i.e
output increases as the input increases)
• When the switch is in the OFF position, the output acts in reverse of the input (i.e.
output decreases as the input increases)
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. If either the remote or local LCD is
present, the display will read ZEroand then sequence back to the home display.
SPaN Calibration
The span calibration can be adjusted only after setting the zero adjustment. 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 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. If either the remote or local LCD is present, 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 flash on the display. On bi-directional models, separate spans can be
performed on the positive and negative sides of the range.
LCD DISPLaY
The Magnesense
® II can be ordered with an optional, integral LCD. If the display is
not needed for normal operation, the transmitter can be ordered without the LCD.
An A-MS2-LCD field upgradeable display is available. It comes with a housing
cover with the overlay cut out for the display. The display will plug into the pins as
shown in Figure 6.
figure 6
Another option for models that do not have a display would be to use a Model A-
435-A remote display tool which can plug into the connector shown in Figure 7. The
remote display tool has two buttons that function identically to the buttons on the
PCB.
figure 7
Display 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.
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.
DIP Switch Units
4
OFF
OFF
ON
ON
5
OFF
ON
OFF
ON
Pressure
kPa
mm w.c.
Pa
in w.c.
Velocity
m/s
m/s
m/s
FPM
Air Flow
m 3 /h
m 3 /h
m 3 /h
cfm
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
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