Bulletin P-DM-1200
Series DM-1200 DigiMag® Digital Differential Pressure and Air Flow Gage
®
Specifications - Installation and Operating Instructions
Ø5.00
The Series DM-1200 DigiMag® Digital Differential Pressure and Air Flow Gage is
the ideal digital instrument to take the place of analog mechanical pressure gages.
The DigiMag® Digital Gages are more versatile than analog gages with their ability to
be field-programmed to select pressure, air velocity or flow operation. The DigiMag®
Digital Differential Pressure Gages have an added feature for filter applications where
a set point can be input where the display will blink when the filter is dirty, alerting the
user that a maintenance action needs to occur.
Programming the Series DM-1200 is easy using the menu key to access 4 simplified
menus which provide access to: Security level; engineering units; K-factor for use with
various Pitot tubes and flow sensors, circular or rectangular duct size for volumetric
flow operation; filter set point; view peak and valley process readings; digital damping
for smoothing erratic process applications; display update to conserve battery life; zero
and span field calibration.
The Series DM-1200 DigiMag® Digital Differential Pressure and Air Flow Gage
possesses a full-scale accuracy of 1% on ranges down to 2 in w.c. and 2% accuracy
down to the very low ranges of 1 in to 0.25 in w.c. DigiMag® Digital Differential Pressure
Gages offer power versatility by working with 9 to 24 VDC line power or simply 9V
battery power. If using line power and connecting the 9V battery, the battery will act as
a back-up if line power is lost or interrupted.
2.33
SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Materials: Glass filled plastic.
Accuracy: ±1% F.S. including linearity, hysteresis and repeatability; ±2% F.S. for
ranges 1 in w.c. and below.
Temperature Limits: 0 to 140°F (-18 to 60°C).
Compensated Temperature Limits: 32 to 122°F (0 to 50°C).
Long Term Stability: ±1% F.S. per year.
Thermal Effect: ±0.05% F.S./°F typ.; ±0.10% F.S./°F for ranges 1 in w.c. and below.
Display: 4-digit LCD (Digits: 0.60˝ H x 0.33˝ W).
Display Update: Selectable for 1 second to 10 minutes or update only from button
push.
Pressure Limits: 5 in w.c. and lower = 2 psi (13.7 kPa) 10 in w.c. and higher = 11
psi (75 kPa).
Power Requirements: 9V battery or external power supply 9-24 VDC. Battery
included but not connected.
Type of Battery: 9V alkaline battery (Duracell® PC 1604 or equivalent).
Battery Service Life: Battery life depending on the Display Update setting: 150
hours (typical) if Display Update = 1 second; 9 months (typical) if Display Update =
10 minutes; 1.5 years (typical) if Display Update is disabled. Battery may last up to
four times longer when using lithium-based battery ULTRALIFE U9VL-J.
Current Consumption: 5 mA maximum.
Electrical Connections: Removable terminal block for 16 to 26 AWG.
Electrical Entry: Cable gland for 0.114 to 0.250˝ (2.9 to 6.4 mm) diameter cable.
Process Connections: 1/8˝ (3 mm) ID tubing.
Enclosure Rating: NEMA 4X (IP66).
Weight: 1.18 lb (535 g).
Size: 5˝ (127 mm) O.D. front face.
Agency Approvals: CE, EN 61326-1 [Immunity Test Requirement for Industrial Environments] with the following SPEC: IEC61000-3-2, IEC61000-3-3, IEC61000-4-2,
IEC61000-4-3, IEC61000-4-4, IEC61000-4-5, IEC61000-4-6, and IEC61000-4-11.
Duracell® is a registered trademark of The Gillette Company
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
www.dwyer-inst.com
Fax: 219/872-9057
e-mail: [email protected]
INSTALLATION
Mounting
A vertical position required. That is the position in which all standard models are
calibrated at the factory. Provide a 4-9/16˝ diameter opening in panel. Insert gage and
secure in place with provided screws and adapters.
B1
CONN6
9V BATTERY
Included Accessories:
Mounting lugs – 3
6-20 x 2-1/2 screws – 3
4-20 x 3/8 screws – 3 (mounting hole depth is 3/8˝ [9.53])
Cable gland – 1
POWER SUPPLY
9 TO 24 VDC
Figure 1
OPERATING INSTRUCTIONS - Key Functions
Home Position
Main Menu
Function
Function
Menu
Allows access to the
Return to
menus
home position
Sub Menu
Function
Return to previous menu
Up Arrow
Displays pressure
Sequences
Increments a value
readings instantly
through menus
(rAtE KEY MODE only)
Sequences
Decrements a value
Down Arrow
through menus
Enter
Pressure Connections
Two integral tubing connections are provided on the back of the gage. They are sized
to fit 3/16˝ (4.8 mm) I.D. x 5/16˝ (7.9 mm) O.D. flexible PVC tubing. To measure single
positive pressure, connect tubing to the + port and vent the – port to atmosphere. To
measure single negative pressure (vacuum), connect tubing to the – port and vent the
+ port to atmosphere. To measure differential pressure, connect higher pressure to
the + port and lower pressure to the – port. Be sure the pressure rating of the tubing
exceeds that of the operating ranges.
Electrical Connections
A 9V battery or an external power supply 9-24 VDC can be used to power the unit. If
both battery and external power supply are connected, the battery will work as back
up power.
Battery Installation
The unit is shipped with a separate 9V alkaline battery. Remove the unit’s top back
cover then connect the 9V battery to the battery holder as shown in Figure 1.
External Power Supply Installation
Remove the unit’s back cover then connect the external power supply to the terminal
block as shown in Figure 1.
POWER MUST BE OFF WHILE WIRING CONNECTIONS
ARE BEING MADE. DO NOT EXCEED SPECIFIED SUPPLY
VOLTAGE RATINGS. PERMANENT DAMAGE NOT COVERED BY WARRANTY
WILL RESULT.
CAUTION
Displays full scale
range of unit
Enter into
SUB MENU
Changes a value or
setting. Press ENTER and
display will blink. Adjust
with UP or DOWN arrows.
Press ENTER to store.
Display will stop blinking.
Menu Map
Main Menu Programming Instructions
(Upper Right Display Reads MENU)
Security Menu: SECr-MENU
Lock out access to all menus or lock out access to all menus except Auto-Zero function
(Auto-ZERO).
Operation Menu: OPEr-MENU
Select the measurement type – pressure, velocity or flow and corresponding
engineering units (Velocity and flow are not available for Model DM-1100).
Display Menu: diS-MENU
Monitor and adjust display related settings: Filter type, filter point, dampening, display
update, peak and valley.
Advanced Menu: AdU-MENU
Perform auto-zero or full-scale calibration.
Security Menu: SECr-MENU
With the gage reading pressure (home position), press and hold the MENU key until
the Security MENU is displayed. Press the E key to show the security SUB MENU
SECr–0001. When the security SUB MENU is selected, the present security level is
displayed in the upper right hand display. To change the security level, adjust the
number displayed to the number shown in the following table for the desired security
level.
Security Level Access
Displayed
All menus access
1
2
All menus locked except the
auto-zero function
3
All menus locked
Password
Value to Enter
10
90
111
The password values shown in the table cannot be altered, so retain a copy of these
pages for future reference.
Operation Menu: OPEr-MENU
With the gage reading a numerical value (home position), press and hold the MENU
key until the Security MENU is displayed. Press the ▼ key to show the OPEr-MENU.
Press the E key to show the Operation SUB MENUS.
The Operation SUB MENUS are:
PrES – Pressure
UEL – Velocity
FLOr – Flow range
KFAC – K Factor
DIA – Diameter
XDIM – X Dimension
FLO – Flow
ArEA – Area
YDIM – Y Dimension
If the instrument is set for Velocity, the OPEr MENU will have an additional
KFAC SUB MENU. If the instrument is set for Flow, the OPEr MENU will have
additional KFAC and ArEA SUB MENUS. These will be discussed under Velocity and
Flow.
Note: When scrolling through the OPEr SUB MENUS, the measurement type the unit
is currently set for will show the units in the upper right display. The other measurement
types will have a blank upper right display (see below).
UEL (Velocity) SUB MENU:
For velocity measurement, the following units are available:
UEL-SFPM: Velocity – Standard feet per minute
UEL-M/S: Velocity – Meters per second
Note: Air velocity and flow readings are based upon standard dry air conditions with an
ambient temperature of 70°F and a barometric pressure of 29.92 INHG.
AVAILABLE VELOCITY RANGES
Input Range SFPM Range M/S Range
in w.c.
0 - 0.25
0 - 2002
0 - 10.17
0 - 0.50
0 - 2832
0 - 14.39
0 - 1.00
0 - 4004
0 - 20.35
0 - 2.00
0 - 5663
0 - 28.77
0 - 5.00
0 - 8954
0 - 45.48
0 - 10.0
0 - 12.66 x 1K 0 - 64.33
0 - 15.0
0 - 15.51 x 1K 0 - 78.76
0 - 25.0
0 - 20.02 x 1K 0 - 101.7
0 - 50.0
0 - 28.32 x 1K 0 - 143.9
FLO (Flow) SUB MENU:
For flow measurements, the following units are available:
FLO – SCFM: Flow – Standard cubic feet per minute
FLO – M3H: Flow – Cubic meters per hour
FLOr (Flow range) SUB MENU:
The following flow ranges are available:
FLOr – HI: Flow range – High: 999.9 x 1K
FLOr – MED: Flow range – Medium: 99.99 x 1K
FLOr – LO: Flow range – Low: 9999
Table 1: FLOr = LO
Maximum Duct Size (English)
Range
SFPM
Max Duct
in w.c.
Range
Size sq ft
0.25
9999
4.994
0.50
9999
3.531
1.00
9999
2.497
2.00
9999
1.766
5.00
9999
1.117
10.0
9999
0.789
15.0
9999
0.644
25.0
9999
0.499
50.0
9999
0.353
Table 2: FLOr = LO
Maximum Duct Size (Metric)
Max Duct
Range
M3/hr
Range
Size M2
in w.c.
0.25
9999
0.273
0.50
9999
0.193
1.00
9999
0.136
2.00
9999
0.096
5.00
9999
0.061
10.0
9999
0.043
15.0
9999
0.035
25.0
9999
0.027
50.0
9999
0.019
Table 3: FLOr = MED
Maximum Duct Size (English)
Range
SFPM
Max Duct
in w.c.
Range
Size sq ft
0.25
99.99x1K 49.94
0.50
99.99x1K 35.31
1.00
99.99x1K 24.97
2.00
99.99x1K 17.66
5.00
99.99x1K 11.17
10.0
99.99x1K 7.898
15.0
99.99x1K 6.446
25.0
99.99x1K 4.994
50.0
99.99x1K 3.530
Table 4: FLOr = MED
Maximum Duct Size (Metric)
Max Duct
Range
M3/hr
Range
Size M2
in w.c.
0.25
99.99x1K 2.731
0.50
99.99x1K 1.930
1.00
99.99x1K 1.364
2.00
99.99x1K 0.965
5.00
99.99x1K 0.610
10.0
99.99x1K 0.431
15.0
99.99x1K 0.352
25.0
99.99x1K 0.273
50.0
99.99x1K 0.193
Table 5: FLOr = HI
Maximum Duct Size (English
Range
SFPM
Max Duct
in w.c.
Range
Size sq ft
0.25
999.9x1K 499.4
0.50
999.9x1K 353.1
1.00
999.9x1K 249.7
2.00
999.9x1K 176.6
5.00
999.9x1K 111.7
10.0
999.9x1K 78.98
15.0
999.9x1K 64.46
25.0
999.9x1K 49.94
50.0
999.9x1K 35.30
Table 6: FLOr = HI
Maximum Duct Size (Metric)
Max Duct
Range
M3/hr
Range
Size M2
in w.c.
0.25
999.9x1K 27.31
0.50
999.9x1K 19.30
1.00
999.9x1K 13.64
2.00
999.9x1K 9.654
5.00
999.9x1K 6.107
10.0
999.9x1K 4.317
15.0
999.9x1K 3.526
25.0
999.9x1K 2.731
50.0
999.9x1K 1.931
KFAC (K Factor) SUB MENU:
1.00-KFAC: K Factor = 1.00
K factor becomes accessible if the instrument is set for Velocity or Flow. When the
DigiMag® is used with a Pitot tube, the manufacturer may specify a K factor. The
adjustment range is 0.01 to 2.00. The factory setting is 1.
ArEA (Area), DIA (Diameter), XDIM (X dimension) and YDIM (Y dimension)
SUB MENUS:
These SUB MENUS become accessible if the instrument is set for Flow. When
measuring flow, the area of the duct must be specified. Tables 1 to 6 show the input
range vs. maximum flow and duct size. For a rectangular duct the maximum size is
specified by the X, Y dimensions. For a circular duct the maximum size is specified by
the diameter. X, Y and circular dimensions are entered in feet with 0.001 foot resolution
for FLOr = LO, 0.01 foot resolution for FLOr = MED and 0.1 foot resolution for FLOr =
HI, or entered in millimeters with 1 millimeter resolution.
ArEA – Area, select CIR for a circular duct or RECT for a rectangular duct. If a circular
duct is selected the DIA SUB MENU will be activated. If a rectangular duct is selected,
the XDIM and YDIM SUB MENUS will be activated.
DIA – Diameter, enter the diameter of a duct
XDIM – Enter the “X” dimension of a duct
YDIM – Enter the “Y” dimension of a duct
Y
X
DISPLAY MENU: diS – MENU
With the gage reading a numerical value (home position), press and hold the MENU
key until the SECr-MENU is displayed. Press the ▼ key until the LCD shows diS
– MENU. Press the E key to show the Display SUB MENUS.
FILTER TYPE SETTING
With the LCD reading FILt – OFF, press the E key; the display will blink. Press the ▼
key to change the filter type then press the E key to save the desired filter type.
FILt – OFF: Filter type = OFF. The filter function is disabled.
FILt – HIGH: Filter type = HIGH. The display blinks when pressure is greater than the
filter point.
FILt – LOW: Filter type - LOW. The display blinks when pressure is less than the filter
point.
FILTER POINT SETTING
With the LCD reading 0.00 – SPPT, press the E key; the display will blink. Press the ▲
or ▼ key to change the filter point then press the E key to save the desired filter point.
0.00 – SPPT: Filter point = 0.00. The filter point may be set to anywhere within the
range of the instrument.
DAMPING SETTING
With the LCD reading 1 – DAMP, press the E key; the display will blink. Press the
▲ or ▼ key to change the damping level then press the E key to save the desired
damping level.
1 – DAMP: Damping level = 1. The damping level can be adjusted from 1 to 15.
Damping stabilizes the display from instabilities due to things such as vibration and
excessive pressure fluctuations. The damping function adjusts the amount of readings
that are averaged for each display update.
DISPLAY UPDATE SETTING
With the LCD reading rAtE – NORM, press the E key; the display will blink. Press
the ▼ key to change the display update rate then press the E key to save the desired
display update rate.
rAtE – NORM: Display update = Normal (1 second).
The gage reads the process pressure and updates the LCD every second.
rAtE – 10: Display update = 10 minutes.
The gage reads the process pressure and updates the LCD every 10 minutes.
rAtE – KEY (On-Touch mode): Display update is disabled.
The gage reads the process pressure and updates the LCD whenever the ▲ key
is pressed. If the ▲ key is released, the LCD will hold and display the last pressure
reading.
NOTES:
1.Depending on the Display Update setting, the battery life is shown below:
-150 hours (typical) if Display Update is set for “Normal” 1 second update.
rAtE-NORM
-1 year (typical) if Display Update is set for 10 minutes. rAtE-10
-2 years (typical) if Display Update is disabled. rAtE-KEY
2.If the Display Update is set for 10 minutes or disabled (On-Touch mode), the
process pressure value can be read instantly by pressing and holding the p key on
the front panel. Also the LCD will automatically show “ALAr” if the filter point has
been exceeded.
PEAK AND VALLEY SETTING
100.0 – PEAK: Peak value = 100.0
The peak feature stores the highest pressure reading the instrument has measured
since the last reset or power up. At power up PEAK is reset to the present
pressure reading. To manually reset the PEAK value, press the E key while in the
PEAK SUB MENU.
0.0 – VALY: Valley value = 0.0
The valley feature stores the lowest pressure reading the instrument has measured
since the last reset or power up. At power up VALY is reset to the present
pressure reading. To manually reset the VALY value, press the E key while in the
VALY SUB MENU.
ADVANCED MENU: AdU – MENU
With the gage reading pressure (home position), press and hold the MENU key until
the SECr-MENU is displayed. Press the ▼ key until the display shows the AdU
– MENU. Press the E key to show the advanced function SUB MENUS.
Auto ZERO: auto-zero
Note: For accurate calibration, DO NOT apply any pressure when performing this
function.
With the display reading Auto ZERO, release pressure to Zero then press the E key;
the display will blink. Press the E key again to complete the Auto-zero.
CAL – SPAN: full-scale calibration
With the display reading CAL – SPAN, apply full-scale pressure then press the E key;
the display will blink. Press the E key again to save the full-scale calibration or press
the MENU key to cancel the calibration.
MAINTENANCE
Upon final installation of the Series DM-1200 DigiMag® Digital Differential Pressure
Gage, no routine maintenance is required. A periodic check of the system is
recommended. The Series DM-1200 is not field serviceable and should be returned
if repair is needed (field repair should not be attempted and may void warranty).
Be sure to include a brief description of the problem plus any relevant application
notes. Contact customer service to receive a return good authorization number before
shipping.
This symbol indicates waste electrical products should not be disposed
of with household waste. Please recycle where facilities exist. Check with
your Local Authority or retailer for recycling advice.
(3) SURFACE MOUNTING
HOLE LOCATIONS
13/32 [10.16]
Ø5/8 [15.88]
THRU HOLE FOR
CONDUIT CONNECTION
OUTSIDE DIAMETER
OF A-286 FLANGE
1-1/4 [31.75]
3-15/32 [88.12]
1-51/64 [45.72]
(3) FLANGE MOUNTING
HOLE LOCATIONS
2X30°
1
[25.44]
STANDARD MOUNTING HOLE
DIMENSION FOR DIGIMAG GAUGE
Ø4-9/16 [115.89]
MOUNTING HOLE DIMENSION
FOR A-286 FLANGE
Ø5-1/8 [130.18]
2xØ13/32 [10.32]
THRU HOLES FOR
PRESSURE PORTS
Ø5-17/32 [140.49]
BOLT CIRCLE
3-5/64
[78.27]
NOTES
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©Copyright 2019 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Printed in U.S.A. 2/19
FR# 443779-50 Rev. 4
Phone: 219/879-8000
www.dwyer-inst.com
Fax: 219/872-9057
e-mail: [email protected]
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