Dwyer MS2 - Manual (Page 5)

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 first 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 flow. 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 flow or a pressure. After adjusting the
Area parameter, the display will indicate if the adjustment is set for pressure or flow.
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 final installation of the Series MS2 Magnesense
® II Differential Pressure
Transmitter, no routine maintenance is required besides zeroing the transmitter
occasionally. Besides routine calibration and installation of the LCD, the Series
MS2 is not field 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(Ft 2 ) x K-Factor x 4004.4 x √(Diff. Press. (in of w.c.)
Flow (m 3 /h) = Flow (cfm) x 1.6992
aPPENDIX II
Maximum flow
Max Displayed flow Range
in w.c.
0.5
5
28
CfM
5885000
5885000
5885000
M 3 /H
9999000
9999000
9999000
CfM Mode
2037.2
644.2
272.2
M 3 /H Mode
154.5
59.9
25.3
Max (K factor x area)