Dwyer Instruments Magnesense Pro MSX Series Installation and operating instructions

Series MSX Pro Magnesense®Differential Pressure Transmitter
Specications - Installation and Operating Instructions
Bulletin P-MSXP-A
The Series MSX Pro Magnesense®Differential Pressure Transmitter is the
professional differential pressure transmitter meeting stringent industry standards with
innovative global product design. The device has exceptional stability for use in critical
building performance applications with the popular versatility of our original Series MS2
Magnesense® II transmitter. The MSX Pro simplies the ordering process to deliver
the desired conguration, which reduces product setup time. Pressure ranges of Pa,
mm w.c., and in w.c. are available per device. All pressure ranges can be congured
in unidirectional or bidirectional modes providing a total of 32 ranges. The MSX Pro
transmitter can provide a linear pressure output or a linear velocity output with the
square root extraction from the transmitter. Additional parameters have been included
to expand the square root capability to calculate ow. Dual voltage and milliamp output
signals can be used to provide control and equipment output signal verication.
INSTALLATION
Surface Mounting:
Mount the transmitter on a vertical surface. The pressure sensor measurement
is unaffected by orientation, but it is recommended the unit be mounted with the
connections facing down to prevent moisture from entering either the pressure ports
or the electrical cable entry. Attach the mounting ange to a at surface using #8 x 1/2˝
pan head sheet metal screws. Do not over tighten.
Duct Mounting (Universal model required):
Mount the transmitter away from fans, corners, heating and cooling coils and other
equipment that will affect the measurement of the pressure.
1. To mount the transmitter, drill a .562˝ (12.70 mm) diameter hole into the duct.
2. Screw duct probe into back of housing. Insert transmitter probe into the duct.
3. Mark location of mounting holes on duct using mounting ange as template. Drill
holes.
4. Attach mounting ange to duct with #8 x 1/2˝ pan head sheet metal screws. Do
not over tighten screws.
5. Place the included cap on the exterior positive pressure port.
The Universal model can also be used as a standard wall mount transmitter. In this
mode, do not use the duct probe and plug the port on the backside of the transmitter
with the included plug.
SPECIFICATIONS
Service: Air and non-combustible,
compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±.5% FSO for all ranges
except unidirectional .5 in. @ ±1% FSO.
Stability: ±1% FSO/year.
Temperature Limits: -4 to 158°F (-20
to 70°C).
Pressure Limits: Ranges 0 and 1: 3.6
psi max operation, 6 psi burst; Ranges 2
and 3: 6 psi max operation, 6 psi burst.
Power Requirements: 10-36 VDC
(2-wire), 17-36 VDC or isolated 21.6-33
VAC (3-wire).
Output Signals: 4-20 mA (2-wire); 0-10
V or 0-5 V selectable (3-wire).
Response Time: Instantaneous (default)
or 3 s (selectable).
Zero and Span Adjustments: Digital
push-button.
Loop Resistance: Current output:
0-1250 Ω max; Voltage output: min. load
resistance 1 kΩ.
Current Consumption: 21 mA max
continuous.
Electrical Connections: 4-wire
removable European style terminal block
for 16 to 26 AWG.
Electrical Entry: 1/2˝ NPS thread. Cable
gland included.
Display (optional): 4 digit LCD.
Process Connections: 1/8˝, 3/16˝, 1/4˝,
5 mm, and 6 mm ID exible tubing.
Enclosure Rating: NEMA 4X (IP66); UL
2043 (Plenum); UL94 V-0.
Mounting Orientation: Pressure sensor
measurement unaffected by orientation.
Weight: 8.0 oz (230 g).
Agency Approvals: CE.
1/2
NPSM
1-29/32
[48.43]
4-3/32
[103.98]
1-1/16 [26.92]
33/64
[13.08]
1-3/16
[30.34] 11/32 [8.56]
2-3/32
[53.34]
2-9/32
[57.79]
1-57/64
[48.10]
1-11/64
[29.92]
1-29/64
[36.75]
1-19/64 [33.02]
1-19/64
[33.02]
1-13/64
[30.48]
1-13/64
[30.48]
[4] 13/64 [5.08] HOLES
3/8 [9.53]
7-9/16 [191.90]
1/2
NPSM
1-43/64 [42.50]
4-3/32
[103.98]
27/64 [10.84]
1-3/16
[30.34]
1-1/16 [26.92]
33/64
[13.08]
11/32 [8.56]
2-3/32
[53.34]
2-9/32
[57.79]
3-5/8 [92.08]
3-15/32
[88.19]
1-29/32
[48.43]
Wall mount bracket
Duct mount bracket
DIN mount bracket
OPTIONS
Range in w.c. Pa low Pa high mm w.c.
Range 0 0.05
0.1
0.25
0.5*
15
25
40
50
60
75
100
125*
1.25
2.5
5
12*
Range 1 0.1
0.25
0.5
1*
25
40
50
60
100
150
160
250*
2.5
5
10
25*
Range 2 1
2
3
5*
250
300
400
500
600
750
1000
1250*
25
50
100
125*
Range 3 10
15
25
28*
1000
1500
2000
2500
3000
4000
5000
7000*
250
350
500
700*
*Indicated values are the positive full scale output values per range.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: [phone]
Fax: [phone]
www.dwyer-inst.com
e-mail: [email protected]

ELECTRICAL
The MSX Pro transmitter utilizes a 2-wire 4-20 mA Current Output, or a 3-wire 0-5
V / 0-10 V Voltage Output. It is also capable of Simultaneous Current and Voltage
Output. The power and signals interconnect via a removable European-style four
conductor terminal block, or optionally, via the included tooless terminal block.
2-Wire 4-20 mA Current Output
The connections to the transmitter are made through terminals VDC and COM on
the terminal block as shown in Figure 1. The terminal block is removable and each
of the terminals are labeled next to the terminal block on the circuit board. Polarity is
indicated by VDC and COM. See Figure 1.
The maximum receiver load resistance (RL) for a given power supply voltage (Vps) is
dened by the formula:
Shielded 2-wire cable is recommended for control loop wiring. Ground the shield at the
power supply end only.
The receiver may be connected to either the negative or positive side of the loop,
whichever is most convenient. Should polarity of the transmitter or receiver be
inadvertently reversed, the loop will not function properly but no damage will be done
to the transmitter.
The maximum length of connecting wire between the transmitter and the receiver is
a function of wire size and receiver resistance. That portion of the total current loop
resistance represented by the resistance of the connecting wires themselves should
not exceed 10% of the receiver resistance. For extremely long runs (over 1,000 feet), it
is desirable to select receivers with lower resistances in order to keep the size and cost
of the connecting leads as low as possible. In installations where the connecting run
is no more than 100 feet, you can use a connecting lead wire as small as No. 22 ga.
3-Wire 0-10 V and 0-5 V Voltage Output
Selection of using a DC or AC power supply is made via the terminal block.
See Figure 2 for DC Wiring.
See Figure 3 for AC Wiring.
The terminal block is removable and each of the terminals are labeled next to the
terminal block on the circuit board. Positive polarity is indicated by VOUT. AC/DC
selection is made via the terminal block. If the polarity of the transmitter is inadvertently
reversed, the unit will not function properly, but no damage will be done to the
transmitter.
The minimum receiver load is 1 kΩ. The resistance due to the wire should be low
compared to the receiver load resistance. While the voltage at the terminal block
remains unchanged with a 10 mA current ow, resistive losses in the wiring do cause
errors in the voltage delivered to the receiver. For a 1% accurate gage, the resistance
of the wires should be less than 0.1% of the value of the receiver load resistance. This
will keep the error caused by the current ow below 0.1%.
The output across VOUT and COM will be either 0-5 V, 0-10 V depending on the DIP
switch setting. See DIP Switch Settings Section for more information.
DC POWER
SUPPLY
10-36 VDC
VAC
VDC
COM
VOUT
CURRENT
RECEIVER
+ --+
DC POWER
SUPPLY
17-36 VDC
VOLTAGE
RECEIVER
-+
+ -
VAC
VDC
COM
VOUT
AC POWER
SUPPLY
21.6-33 VAC
VOLTAGE
RECEIVER
VAC
VDC
COM
VOUT
-+
DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS.
PERMANENT DAMAGE NOT COVERED BY WARRANTY WILL
RESULT. SIMULTANEOUS OUTPUTS ARE NOT DESIGNED FOR AC VOLTAGE
OPERATION.
CAUTION
DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS.
PERMANENT DAMAGE NOT COVERED BY WARRANTY WILL
RESULT.
CAUTION
Figure 1
Figure 2: DC wiring
Figure 3: AC wiring
RL= Vps - 10.0
20 mA DC
If equipped, the LCD must be removed before wiring. Pull the LCD
directly away from the product to remove. Reinstall the LCD after
wiring is completed.
NOTICE

Simultaneous Current and Voltage Output
The terminal block is removable and each of the terminals is labeled underneath the
terminal block on the circuit board. Positive polarity is indicated by VOUT. The VDC
terminal and a DC power supply must be used for Simultaneous Current and Voltage
Output. The voltage output and the power supply must have separate wire leads
that are only joined at terminal 2 of the transmitter. Additional error may occur for the
voltage output if a single wire is used or if the wires are joined at the power supply or
receiver.
For the current output, the maximum allowable loop resistance (wiring + receiver
resistance) is dependent on the power supply. The maximum loop voltage drop must
not reduce the transmitter voltage below 17 V. The maximum loop resistance (RMAX)
for a given power supply voltage (VPS) can be calculated using the following equation:
The equation uses 17.0 instead of 10.0 as seen in the equation earlier with Figure
1. This represents the minimum voltage supply which is higher on the simultaneous
output conguration due to the requirements of the voltage outputs.
Shielded 4-wire cable is recommended for control loop wiring. Ground the shield
at the power supply end only. Should the polarity of the transmitter or receiver be
inadvertently reversed, the unit will not function properly, but no damage will be done
to the transmitter.
For voltage outputs, the minimum receiver load is 1 kΩ. The resistance due to the
wire should be low compared to the receiver load resistance. While the voltage at the
terminal block remains unchanged with a 10 mA current ow, resistive losses in the
wiring do cause errors in the voltage delivered to the receiver. For a 1% accurate gage,
the resistance of the wires should be less than 0.1% of the value of the receiver load
resistance. This will keep the error caused by the current ow below 0.1%.
The output across VOUT and COM will be either 0-5 V or 0-10 V depending on the DIP
switch setting. See DIP Switch Settings Section for more information.
Power Supply
Refer to the following tables for the required supply rating.
DIP SWITCH SETTINGS
DIP switch settings are marked directly on the PCBA as shown in Figure 5. Switches
are factory-set, based on the order conguration. You can also use a small screwdriver
or pen to change the position of the switches.
Key To DIP Switch Settings
Switches are numbered 1 to 8 beginning on the left.
DIP Switches 1 and 2 - Unit of Measure Selection
DIP Switches 1 and 2 work as a pair to select the unit of measure.
VAC
VDC
COM
VOUT
DC POWER
SUPPLY
10-36 VDC
VOLTAGE
RECEIVER
CURRENT
RECEIVER
+-
+ - -+
Figure 4: Simultaneous current and voltage output wiring
DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS.
PERMANENT DAMAGE NOT COVERED BY WARRANTY WILL
RESULT. SIMULTANEOUS OUTPUTS ARE NOT DESIGNED FOR AC VOLTAGE
OPERATION.
CAUTION
Figure 5 is a depiction of a 5 in w.c. pressure board. Other pressure
boards, while similar, will vary from the below.
NOTICE
There are no hazardous voltages if supplied power is within the
specied range. However, it is a good idea to shut control systems
down while changing DIP switches to prevent erratic control system behavior.
WARNING
Current Output
Supply Voltage 10-36 VDC
Loop Resistance 0-1250 Ω
Voltage Output
Supply Voltage 17-36 VDC
21.6 to 33 VAC isolated
Minimum Output Load Resistance 1000 Ω
PRESSURE UNIT SELECTION - DIP SWITCH 3 IS OFF (DOWN)
DIP Switch 1 DIP Switch 2 Unit of Measure
ON
ON
OFF
OFF
ON
OFF
ON
OFF
Pa (low ranges)
Pa (high ranges)
mm w.c.
in w.c.
VELOCITY/FLOW UNIT SELECTION - DIP SWITCH 3 IS ON (UP)
DIP Switch 1 DIP Switch 2 Unit of Measure
ON
ON
OFF
OFF
ON
OFF
ON
OFF
m3/hr (Flow)
m/s (Velocity)
CFM (Flow)
FPM (Velocity)
Figure 5: 5 in w.c. pressure board
RMAX = (VPS – 17.0)
20 mA DC

DIP Switch 3 - Pressure vs Velocity/Flow Mode of Operation
DIP Switch 3 toggles between pressure output vs velocity or ow output.
• When the switch is in the OFF or down position, the device is in Pressure Mode.
• When the switch is in the ON or up position, the device is in Velocity/Flow Mode.
DIP Switch 4 - Voltage Output Range
Voltage output range can be either 0-10 V or 0-5 V depending on the position of DIP
Switch 4.
• When the switch is in the OFF or down position, the output will be 0-10 V
• When the switch is in the ON or up position, the output will be 0-5 V.
DIP Switch 5 - Unidirectional vs Bidirectional Output
DIP Switch 5 can be set to measure pressure in one direction (unidirectional) or in both
directions (bidirectional).
• When the switch is in the OFF or down direction, the transmitter will be set for uni-
directional and will be 0 based (i.e. 0 to 5 in w.c.).
• When the switch is in the ON or up position, the transmitter will be set for
bidirectional and will be ± the maximum of the selected range (i.e. ±5 in w.c.).
DIP Switch 6 - Response Time Selection
DIP Switch 6 toggles to select the desired response time.
• When the switch is in the OFF or down direction, the transmitter response time will
be instantaneous.
• When the switch is in the ON or up direction, the response time will be 3 seconds.
DIP Switches 7 and 8 - Maximum Range Selection (Pressure)
DIP switches 7 and 8 work as a pair to select the maximum range output of the
transmitter. Use the tables below to navigate pressure range selection. Alternatively, if
using the device for velocity and ow, proceed to the next section.
DIP Switches 7 and 8 - Maximum Range Selection (Velocity/Flow)
DIP switches 7 and 8 work as a pair to select the maximum range output of the
transmitter. Use the tables below to navigate velocity and ow range selection.
CALIBRATION
The transmitter security feature must be unlocked before calibration is accessible. See
Section Program Menu-Menu Access Security. There is a 3 second delay from the
time the zero or span calibration buttons are released until the time that the change
in calibration takes place. This delay is used to prevent stress related offsets on the
lower ranges.
Zero Calibration
The zero calibration can be set by applying zero pressure to both of the pressure ports
and pressing the zero button for 3 seconds. If the LCD display is present, the display
will read ZERO and then sequence back to the home display.
Span Calibration
The span calibration function allows the pressure value to be adjusted so that the
currently applied pressure is the maximum congured pressure. This will in turn set
the maximum analog output at the set pressure. It is recommended that the ZERO
function be applied before performing a span. Apply the maximum desired pressure
to the device, press and hold span for 3 seconds. If the LCD display is present, SPAN
is displayed. The span function will be processed 3 seconds after the span button is
released.
For a positive span, apply pressure to the positive “+” port.
NOTICE
Range 0 Pressure Range Selections
DIP Switch 7 DIP Switch 8 Pa (set 1) Pa (set 2) mm w.c. in w.c.
ON
OFF
ON
OFF
ON
ON
OFF
OFF
15
25
40
50
60
75
100
125
1.25
2.5
5
12
0.05
0.1
0.25
0.5
Range 0 Pressure Range Selections
DIP Switch 7 DIP Switch 8
m3/hr
(Flow)
m/s
(Velocity)
CFM
(Flow)
FPM
(Velocity)
ON
OFF
ON
OFF
ON
ON
OFF
OFF
1700
2700
3700
4800
5
8
11
14
850
1250
2000
2800
850
1250
2000
2800
Range 1 Pressure Range Selections
DIP Switch 7 DIP Switch 8
m3/hr
(Flow)
m/s
(Velocity)
CFM
(Flow)
FPM
(Velocity)
ON
OFF
ON
OFF
ON
ON
OFF
OFF
2500
3300
5200
6800
7.5
10
15
20
1250
2000
2800
4000
1250
2000
2800
4000
Range 2 Pressure Range Selections
DIP Switch 7 DIP Switch 8
m3/hr
(Flow)
m/s
(Velocity)
CFM
(Flow)
FPM
(Velocity)
ON
OFF
ON
OFF
ON
ON
OFF
OFF
6800
8600
11800
15200
20
25
35
45
4000
5600
6900
8950
4000
5600
6900
8950
Range 3 Pressure Range Selections
DIP Switch 7 DIP Switch 8
m3/hr
(Flow)
m/s
(Velocity)
CFM
(Flow)
FPM
(Velocity)
ON
OFF
ON
OFF
ON
ON
OFF
OFF
18000
23000
30000
36000
55
70
90
107
9000
12000
15000
20000
9000
12000
15000
20000
Range 1 Pressure Range Selections
DIP Switch 7 DIP Switch 8 Pa (set 1) Pa (set 2) mm w.c. in w.c.
ON
OFF
ON
OFF
ON
ON
OFF
OFF
25
40
50
60
100
150
160
250
2.5
5
10
25
0.1
0.25
0.5
1
Range 2 Pressure Range Selections
DIP Switch 7 DIP Switch 8 Pa (set 1) Pa (set 2) mm w.c. in w.c.
ON
OFF
ON
OFF
ON
ON
OFF
OFF
250
300
400
500
600
750
1000
1250
25
50
100
125
1
2
3
5
Range 3 Pressure Range Selections
DIP Switch 7 DIP Switch 8 Pa (set 1) Pa (set 2) mm w.c. in w.c.
ON
OFF
ON
OFF
ON
ON
OFF
OFF
1000
1500
2000
2500
3000
4000
5000
7000
250
350
500
700
10
15
25
28

LCD DISPLAY
The LCD comes with a housing cover, which contains a window. The display plugs
into the pins on top of the circuit board. The LCD is 180° rotatable so that it will read
properly if the device must be mounted with the connections facing up.
The following error messages will appear if an LCD is present and the device is an
error state.
PROGRAM MENU
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
By default, a PIN code is not required to enter the conguration menus. However, if
access to the menus needs to be restricted, follow the steps below.
1. While in the Home Menu, press and hold the Zero and Span buttons until “PIN”
is displayed.
2. Press and hold the Zero and Span buttons until the current PIN setting is
displayed (default is 0000).
3. Use the Zero button to increment the selected digit (denoted by the caron ) or
press the Span button to select the next digit to the right.
4. Any value between 0001 and 9999 will result in the requirement to enter the PIN
each time the menu is entered. The value 0000 will disable the PIN entry
requirement.
5. Press and hold the Span button until the next menu is displayed. PIN security set
up is now complete.
MAINTENANCE/REPAIR
Upon nal installation of the Series MSX Pro, no routine maintenance is required. The
Series MSX Pro is not eld serviceable and should be returned if repair is needed.
Field repair should not be attempted and may void warranty.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sale” in our catalog and on our website. Contact
customer service to receive a Return Materials Authorization (RMA) number before
shipping the product back for repair. Be sure to include a brief description of the
problem plus any additional application notes.
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.
LCD Error Messages
Error Code Message
OVER The applied pressure is 3% greater than the selected output high
value causing an Over Range Error.
UNDR The applied pressure is 1% less than the selected output low value
causing an Under Range Error.
FAIL When the span button is pressed, the pressure value is out of the
range to allow a correct setting.
ER 1 The pressure applied to the sensor is beyond its ability to read.
ER 2 The pressure sensor is communicating but reporting an internal error.
ER 3 The pressure sensor is not communicating.
ER 4 The stored user settings are invalid.
ER 5 The stored factory settings are invalid.
ER 6 Non-volatile user memory has failed.
ER 7 Non-volatile factory memory has failed.

POWER ON
(RESET)
DISPLAY ALL
SEGMENTS
HOME SCREEN
(MODE = PRESSURE)
FIRMWARE VERSION
(MAY VARY)
PIN MENU
HOME
SCREEN
HOME
SCREEN
HOME
SCREEN
PRESS ZERO/VALUE BUTTON
PRESS SPAN/DIGIT BUTTON
HOLD ZERO/VALUE BUTTON
HOLD SPAN/DIGIT BUTTON
PRESS EITHER ZERO/VALUE
OR SPAN/DIGIT BUTTON
HOLD BOTH ZERO/VALUE
AND SPAN/DIGIT BUTTON
MENU LEGEND
FLOW
MENU
VELOCITY
MENU
K-FACTOR MENU
PRESSURE MENU
(OUTPUT
LOW MENU)
PRESSURE MENU
(OUTPUT
HIGH MENU)
PRESSURE MENU
(ALARM LOW)
PRESSURE MENU
(ALARM HIGH)
RESET MENU
HOME
SCREEN
SS
POWER ON
(RESET)
MSX PRO MAIN UI AND PRESSURE FLOWCHART

VELOCITY MENU
(OUTPUT
LOW MENU)
VELOCITY MENU
(OUTPUT
HIGH MENU)
RESET MENU
PRESS ZERO/VALUE BUTTON
PRESS SPAN/DIGIT BUTTON
HOLD ZERO/VALUE BUTTON
HOLD SPAN/DIGIT BUTTON
PRESS EITHER ZERO/VALUE
OR SPAN/DIGIT BUTTON
HOLD BOTH ZERO/VALUE
AND SPAN/DIGIT BUTTON
MENU LEGEND
HOME
SCREEN POWER ON
(RESET)
VELOCITY
MENU
POWER ON
(RESET)
FLOW MENU
(AREA)
FLOW MENU
(OUTPUT LOW MENU)
FLOW MENU
(OUTPUT HIGH MENU)
RESET MENU
HOME
SCREEN
FLOW
MENU
MSX PRO VELOCITY SETTINGS FLOWCHART
MSX PRO FLOW SETTINGS FLOWCHART

Printed in U.S.A. 8/20 FR# 444576-10©Copyright 2020 Dwyer Instruments, Inc.
NOTES
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DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: [phone]
Fax: [phone]
www.dwyer-inst.com
e-mail: [email protected]