Dwyer MSX Manual

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Bulletin P-MSXP-A

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[57.79]

1-19/64 [33.02]

Series MSX Pro Magnesense® Differential Pressure Transmitter

Specications - Installation and Operating Instructions

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

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.

II transmitter. The MSX Pro simplies the ordering process to deliver

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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, 3 and 4: 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.

OPTIONS

Range in w.c. Pa low Pa high mm w.c.

Range 0 0.05

Range 1 0.1

Range 2 1

Range 3 10

Range 4 1

*Indicated values are the positive full scale output values per range.

Note: Ranges indicated in the table are the high end of the set

range. All ranges have a low end pressure value of 0.

0.1

0.25

0.5*

0.25

0.5 1*

2 3

15 25 28*

5 10 15*

1/2

NPSM

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Wall mount bracket

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Duct mount bracket

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1/2

DIN mount bracket

15 25 40 50 25 40 50 60 250 300 400 500 1000 1500 2000 2500 250 300 400 500

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[4] 13/64 [5.08] HOLES

3/8 [9.53]

1-1/16 [26.92]

60 75 100 125* 100 150 160 250* 600 750 1000 1250* 3000 4000 5000 7000* 1000 2000 3000 4000*

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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). Compliance: CE.

1.25

2.5 5 12*

2.5 5 10 25* 25 50 100 125* 250 350 500 700* 25 125 250 400*

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2-9/32

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219-879-8000

Fax: 219-872-9057

www.dwyer-inst.com

e-mail: info@dwyermail.com

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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.

NOTICE

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.

2-Wire 4-20 mA Current Output

CAUTION

DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS.

PERMANENT DAMAGE NOT COVERED BY WARRANTY WILL RESULT. SIMULTANEOUS OUTPUTS ARE NOT DESIGNED FOR AC VOLTAGE OPERATION.

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.

3-Wire 0-10 V and 0-5 V Voltage Output

CAUTION

DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS. PERMANENT DAMAGE NOT COVERED BY WARRANTY WILL

RESULT.

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.

DC POWER

SUPPLY

17-36 VDC

VAC

VDC

COM

VOUT

VOLTAGE

RECEIVER

VAC

VDC

COM

VOUT

DC POWER

10-36 VDC

SUPPLY

CURRENT

RECEIVER

Figure 1

The maximum receiver load resistance (RL) for a given power supply voltage (Vps) is dened by the formula:

L =

ps - 10.0

20 mA DC

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.

Figure 2: DC wiring

VAC

VDC

COM

VOUT

AC POWER

SUPPLY

21.6-33 VAC

VOLTAGE

RECEIVER

Figure 3: 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.

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Simultaneous Current and Voltage Output

CAUTION

DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS.

PERMANENT DAMAGE NOT COVERED BY WARRANTY WILL RESULT. SIMULTANEOUS OUTPUTS ARE NOT DESIGNED FOR AC VOLTAGE OPERATION.

VAC

VDC

COM

VOUT

CURRENT

RECEIVER

DC POWER

+ -

SUPPLY

10-36 VDC

VOLTAGE

RECEIVER

Figure 4: Simultaneous current and voltage output wiring

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.

Power Supply

Refer to the following tables for the required supply rating.

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

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.

NOTICE

WARNING

Figure 5 is a depiction of a 5 in w.c. pressure board. Other pressure boards, while similar, will vary from the below.

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.

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 (R for a given power supply voltage (V

PS) can be calculated using the following equation:

(VPS – 17.0)

MAX =

20 mA DC

MAX)

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.

Figure 5: 5 in w.c. pressure board

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.

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

/hr (Flow)

m/s (Velocity) CFM (Flow) FPM (Velocity)

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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.

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

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.

RANGE 0 PRESSURE RANGE SELECTIONS

DIP Switch 7 DIP Switch 8

ON OFF ON OFF

ON ON OFF OFF

RANGE 1 PRESSURE RANGE SELECTIONS

DIP Switch 7 DIP Switch 8

ON OFF ON OFF

ON ON OFF OFF

RANGE 2 PRESSURE RANGE SELECTIONS

DIP Switch 7 DIP Switch 8

ON OFF ON OFF

ON ON OFF OFF

RANGE 3 PRESSURE RANGE SELECTIONS

DIP Switch 7 DIP Switch 8

ON OFF ON OFF

ON ON OFF OFF

/hr

(Flow)

1700 2700 3700 4800

/hr

(Flow)

2500 3300 5200 6800

/hr

(Flow)

6800 8600 11800 15200

/hr

(Flow)

18000 23000 30000 36000

m/s

(Velocity)

5 8 11 14

m/s

(Velocity)

7.5 10 15 20

m/s

(Velocity)

20 25 35 45

m/s

(Velocity)

55 70 90 107

CFM (Flow)

850 1250 2000 2800

CFM (Flow)

1250 2000 2800 4000

CFM (Flow)

4000 5600 6900 8950

CFM (Flow)

9000 12000 15000 20000

FPM (Velocity)

850 1250 2000 2800

FPM (Velocity)

1250 2000 2800 4000

FPM (Velocity)

4000 5600 6900 8950

FPM (Velocity)

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

2 3

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

RANGE 4 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

1000 2000 3000 4000

25 125 250 400

1 5 10 15

RANGE 4 PRESSURE RANGE SELECTIONS

DIP Switch 7 DIP Switch 8

ON OFF ON OFF

ON ON OFF OFF

/hr

(Flow)

7000 15000 21000 26000

m/s

(Velocity)

20 45 64 78

CFM (Flow)

4000 9000 12000 15000

FPM (Velocity)

4000 9000 12000 15000

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

NOTICE

For a positive span, apply pressure to the positive “+” port.

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.

Page 5

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.

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.

The following error messages will appear if an LCD is present and the device is an

error state.

LCD ERROR MESSAGES Error Code Message

OVER The applied pressure is 3% greater than the selected output high

UNDR The applied pressure is 1% less than the selected output low value

FAIL When the span button is pressed, the pressure value is out of the

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.

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

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.

value causing an Over Range Error.

causing an Under Range Error.

range to allow a correct setting.

) or

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.

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.

Page 6

(OUTPUT

MSX PRO MAIN UI AND PRESSURE FLOWCHART

POWER ON

(RESET)

DISPLAY ALL SEGMENTS

FIRMWARE VERSION

(MAY VARY)

MENU LEGEND

PRESS ZERO/VALUE BUTTON PRESS SPAN/DIGIT BUTTON

PRESS EITHER ZERO/VALUE OR SPAN/DIGIT BUTTON

HOLD ZERO/VALUE BUTTON HOLD SPAN/DIGIT BUTTON

HOLD BOTH ZERO/VALUE AND SPAN/DIGIT BUTTON

HOME

SCREEN

HOME SCREEN

(MODE = PRESSURE)

PIN MENU

K-FACTOR MENU

PRESSURE MENU

LOW MENU)

HOME

SCREEN

HOME

SCREEN

FLOW MENU

VELOCITY

PRESSURE MENU

HIGH MENU)

PRESSURE MENU

(ALARM LOW)

PRESSURE MENU

(ALARM HIGH)

RESET MENU

HOME

SCREEN

POWER ON

(RESET)

Page 7

(OUTPUT

MSX PRO VELOCITY SETTINGS FLOWCHART

VELOCITY

VELOCITY MENU

LOW MENU)

VELOCITY MENU

HIGH MENU)

RESET MENU

MENU LEGEND

PRESS ZERO/VALUE BUTTON PRESS SPAN/DIGIT BUTTON

PRESS EITHER ZERO/VALUE OR SPAN/DIGIT BUTTON

HOLD ZERO/VALUE BUTTON HOLD SPAN/DIGIT BUTTON

HOLD BOTH ZERO/VALUE AND SPAN/DIGIT BUTTON

HOME

SCREEN

MSX PRO FLOW SETTINGS FLOWCHART

FLOW MENU

(AREA)

FLOW MENU

(OUTPUT LOW MENU)

FLOW MENU

(OUTPUT HIGH MENU)

RESET MENU

POWER ON

(RESET)

HOME

SCREEN

POWER ON

(RESET)

Page 8

NOTES

__________________________________________________________________________________________________________________________________________

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219-879-8000

Fax: 219-872-9057

www.dwyer-inst.com

e-mail: info@dwyermail.com

Dwyer MSX Manual

Specifications and Main Features

Frequently Asked Questions

User Manual