Dwyer Instruments Magnesense II MS2-X102, Magnesense II MS2-X103, Magnesense II MS2-X101, Magnesense II MS2-X111, Magnesense II MS2-X112 Installation And Operating Instructions Manual
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®
Series MS2 Magnesense® II Differential Pressure Transmitter
Specications - Installation and Operating Instructions
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The Series MS2 Magnesense® II Differential Pressure Transmitter combines the
proven stable Piezo sensing technology of our original Series MS with additional
features to reduce installation time and simplify ordering. In this second generation
transmitter, we have added additional eld selectable pressure ranges so that each
model can have four selectable ranges along with four additional bidirectional ranges.
When using the pluggable integral display or the portable remote display tool, both
Metric and English engineering units can be selected via on board dip switches. Dual
current and voltage outputs allow users to simultaneously take either a current or
voltage output to their building controller and have a local test circuit for verication of
the output reading. The voltage output can be selected to be either 0 to 5 VDC or 0 to
10 VDC, while the current is always 4 to 20 mA. Both the current and voltage output
can also be inverted. Alternatively, the MS2 can be ordered with either a BACnet
or MODBUS
chained together.
Like the original Series MS, the second generation transmitter can be used as a linear
pressure output or a linear velocity output with the square root extraction done in
the transmitter. Additional parameters have been included to expand the square root
capability to include ow measurements.
BACnet
nodes in any segment to 32. Therefore, the transceiver may be rated at one unit load.
Fractional loads are also acceptable. The MS2 accounts as an eighth of a load on the
MSTP network.
INSTALLATION
Surface Mount:
The transmitter should be mounted on a vertical surface with the connections directed
down to prevent moisture from entering either the pressure ports or the electrical cable
entry. The diaphragm must be vertical to minimize gravity effects on the diaphragm.
Attach the mounting ange to a at surface using three #8 x 1/2˝ pan head sheet metal
screws. Do not over tighten.
®
Communications protocol that will allow the transmitters to be daisy-
®
and Modbus® Communications protocol recommend limiting the number of
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SPECIFICATIONS
Supported Baud Rates: 9600, 19200, 38400, 57600, 76800, 115200.
Data Size: 8.
Parity: None.
Stop Bits: 1.
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±1% FS for 0.25˝ (50 Pa), 0.5˝ (100 Pa), 2˝ (500 Pa), 5˝ (1250 Pa), 10˝
(2 kPa), 15˝ (3 kPa), 25˝ (5 kPa); ±2% FS for 0.1˝ (25 Pa), 1˝ (250 Pa), ±0.1˝ (±25
Pa), ±1˝ (±250 Pa) and all bi-directional ranges.
Stability: ±1% / year FSO.
Temperature Limits: 0 to 150°F (-18 to 66°C).
Pressure Limits: 1 psi max., operation; 10 psi burst.
Power Requirements: 10 to 35 VDC (2 wire), 17 to 36 VDC or isolated 21.6 to 33
VAC (3 wire).
Output Signals: 4 to 20 mA (2-wire), 0 to 5 VDC, 0 to 10 VDC (3-wire).
Response Time: Averaging 0 to 240 sec, 2.5 Hz sample rate, 1.5 to 228 sec for
95% step change.
Zero & Span Adjustments: Digital push buttons.
Loop Resistance: Current output: 0 to 1250Ω max; Voltage output: Min. load
resistance 1kΩ.
Current Consumption: 40 mA max.
Display (optional): 5-digit LCD.
Electrical Connections: 3-wire removable European style terminal block for 16 to
26 AWG.
Electrical Entry: 1/2˝ NPS thread; Accessory (A-151): Cable gland for 5 to 10 mm
diameter cable.
Process Connection: 3/16˝ ID tubing (5 mm ID); Max. OD 9 mm.
Enclosure Rating: IP66.
Mounting Orientation: Diaphragm in vertical position.
Weight: 8.0 oz (230 g).
Agency Approvals: CE.
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Wall Mount Bracket
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DIN Mount Bracket
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Duct Mount:
The transmitter should be mounted away from fans, corners, heating and cooling coils
and other equipment that will effect the measurement of the pressure.
1. To mount the transmitter, drill a .562˝ (12.70 mm) diameter hold into the duct.
2. Insert transmitter probe into the duct.
3. Mark location of three mounting holes on duct using mounting ange as template.
Drill holes.
4. Attach mounting ange to duct with three #8 x 1/2˝ pan head sheet metal screws.
Do not over tighten screws.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Electrical Connection:
The Series MS2 simultaneously transmits a 2-wire 4 to 20 mA current output and
a 3-wire 0 to 5 V / 0 to 10 V voltage output via a removable European-style three
conductor terminal block. The transmitter can be wired in one of the following three
ways to utilize the current and / or voltage output. The range of the voltage output can
be selected using the on board dip switches as described in the Dip Switch Settings
section of this manual.
Modbus® is a registered trademark of Schneider Automation, Inc.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
Power Supply
AC
AC/DC JUMPER
CURRENT OUTPUT WIRING
Refer to the below table for the required supply rating.
Output Type Power Supply Rating
2-wire current
3-wire voltage
Simultaneous current and voltage
10 to 40 VDC (40 mA min)
17 to 40 VDC or 21.6 to 33 VAC (40 mA min)
17 to 40 VDC (40 mA min)
Choose a power supply with a voltage and current rating sufcient to meet the power
specications under all operating conditions. If the supply is unregulated, make sure
that the output voltage remains within the required voltage range under all power line
conditions. Ripple on the supply should not exceed 100 mV.
AC/DC Jumper Selection
NOTICE
The jumper is factory set to AC. If DC power is applied while
the jumper is set to AC, no damage will occur. However, the
accuracy of the unit may temporarily be affected.
CAUTION
Powering the unit with AC power while the jumper is set to DC
may permanently damage the transmitter.
Refer to Figure 1 for the location of the AC / DC jumper. Place the shorting jumper
across either the two pins marked AC or the two pins marked DC.
The range of appropriate receiver load resistances (RL) for the power supply voltage
available is given by the formula listed below. Shielded 2-wire cable is recommended
for control loop wiring. Ground the shield at the power supply end only.
NOTICE
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.
ps - 10.0
V
L =
R
20 mA DC
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, connecting lead wire as small as No. 22 ga. can be used.
3-Wire 0 to 10 V and 0 to 5V Voltage Operation
CAUTION
DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS.
PERMANENT DAMAGE NOT COVERED BY WARRANTY
WILL RESULT.
The connection to the transmitter are made to Terminals 1, 2, and 3 on the terminal
block as shown in Figure 3. The terminal block is removable and each of the terminals
are labeled underneath the terminal block on the circuit board. Polarity is indicated by
PWR, COM, and +VOUT. When connecting using a DC power source, make sure the
AC/DC selection jumper is set for DC. If the polarity of the transmitter is inadvertently
reversed, the unit will not function properly, but no damage will be done to the
transmitter. When connecting to an AC power source, make sure the AC/DC selection
jumper is set for AC. Either lead of the supply power may be connected to PWR and
COM without affecting the operation of the transmitter or damage to the transmitter.
DC
Figure 1
2-Wire 4 to 20 mA Current Operation
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 2 and 3 on the terminal
block as shown in Figure 2. The terminal block is removable and each of the terminals
are labeled underneath the terminal block on the circuit board. Polarity is indicated by
+IOUT and -IOUT. The AC/DC selection jumper should be set for DC operation.
3
2
1
RECEIVER
+
_
+
POWER
_
VOLTAGE OUTPUT WIRING
Figure 3
The minimum receiver load is 1K Ω. 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 gauge, 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 to 5 V, 0 to 10 V, or the inverse
depending on the dip switch setting. See Dip Switch Setting Section for more
information.
+
_
Figure 2
+
POWERRECEIVER
_
Simultaneous Current and Voltage Operation
VOLTAGE OUTPUT WIRING
NOT
VOL
MUST
WIRES
WIRED
ON
DIP SWITCH SETTINGS
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 connection to the transmitter are made to Terminals 1, 2, and 3 on the terminal
block as shown in Figure 4. The terminal block is removable and each of the terminals
are labeled underneath the terminal block on the circuit board. Polarity is indicated by
PWR, COM, and +VOUT. The AC/DC selection jumper should be set for DC operation.
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 AND
TAGE RECEIVER “-”
BE SEPERATE
AND BOTH
TO
_
+
CURRENT
RECEVIER
VOLTAGE
RECEVIER
+
_
_
POWER
+
SIMULTANEOUS CURRENT AND
Figure 4
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 can be
calculated using the following equation:
R
MAX = (VPS – 17.0) / 0.02 Where VPS is the power supply voltage
The equation uses 17.0 instead of 10.0 used in current only equation. This represents
the minimum voltage supply which is higher on the simultaneous output conguration
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.
DIP SWITCH SETTINGS
DIP Switches can be located next to the terminal block as shown in Figure 5. A small
screw driver or pen can be used to change the position of the switches.
WARNING
All power should be turned off to the transmitter before adjusting
the dip switch settings to avoid electrical shock.
DIR
10V
UNITS
UNIDIRECTIONAL BIDIRECTIONAL
7
6
5
4
3
RANGE
REV
5V
2
1
Figure 5
Factory Settings
Mode = Unidirectional (except on MS2-XX1X models)
Range = Highest Range Setting (0.5, 5, or 28 in w.c.)
Units = Inches W.C.
Voltage Output Range = 10 V
Direct / Reverse Output Action = Direct
Setting the Pressure Range
Ranges are selected by adjusting DIP Switch Positions 1 and 2 according to the
below tables. The range also depends on the units selected (Refer to Setting the
Engineering Units Section) and if the input is set for unidirectional or bidirectional
(Refer to the Setting for Unidirectional or Bidirectional Section). The tables below show
the maximum full scale value for the selected range and selected units. If the unit is set
to unidirectional, the ranges are all zero based. If the unit is set for bidirectional, the
ranges will be ± the maximum full scale value shown in the tables below.
DIP Switch Full Scale Range for MS2-X101
1 2 in w.c. Pa mm w.c. kPa
OFF
OFF
OFF
ON
ON
ON
OFF
ON
0.1
0.15
0.25
0.5
25
40
50
125
2.5
4
6
10
0.025
0.040
0.050
0.125
For voltage outputs, the minimum receiver load is 1K Ω. 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
gauge, 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 to 5 V, 0 to 10 V, or the inverse
depending on the dip switch setting. See Dip Switch Setting Section for more
information.
DIP Switch Full Scale Range for MS2-X102
1 2 in w.c. Pa mm w.c. kPa
OFF
OFF
OFF
ON
ON
ON
OFF
ON
1
2
3
5
250
500
750
1250
25
50
75
125
0.250
0.500
0.750
1.25
DIP Switch Full Scale Range for MS2-X103
1 2 in w.c. Pa mm w.c. kPa
OFF
OFF
OFF
ON
ON
ON
OFF
ON
10
15
25
28
2500
3500
5000
6975
250
350
500
700
2.50
3.50
5.00
6.98
Setting for Unidirectional or Bidirectional
The Models MS2-X101 and MS2-X102 models are unidirectional only. The Bidirectional
models MS2-X103, MS2-X111 and MS2-X112 can be changed to measure pressure in
one direction at a reduced accuracy by changing the setting of DIP Switch 3.
• When the switch is in the ON direction, the transmitter will be set for Unidirectional
and will be 0 based (i.e. 0 to 5 in w.c.).
• When the switch is in the OFF position, the transmitter will be set for Bidirectional
and will be ± the maximum of the selected range (i.e. ±5 in w.c.).
• For unidirectional units only, switch has no effect and unit will remain in unidirectional
mode.
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