Dwyer MS2 - Manual

Bulletin P-MS2
The Series MS2 Magnesense ® II Differential Pressure Transmitter combines
the proven stable Hall Effect 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 field 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 verification 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
® Communications
protocol that will allow the transmitters to be daisy-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 flow measurements.
BACnet ® and Modbus ® Communications protocol recommend limiting the number
of 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 flange to a flat surface using three #8 x 1/2˝
pan head sheet metal screws. Do not over tighten.
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 flange as
template. Drill holes.
4. Attach mounting flange to duct with three #8 x 1/2˝ pan head sheet metal
screws. Do not over tighten screws.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGaN CITY, INDIaNa 46360, U.S.a. fax: 219/872-9057 e-mail: [email protected]
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) and ±1˝ (±250 Pa).
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.
Specifications - Installation and Operating Instructions
Series MS2 Magnesense ® II Differential Pressure Transmitter
Ш3-7/16
[Ш87.31]
2-41/64
[67.07]
1/2 NPT
21/32
[16.67]
21/32
[16.67]
29/32
[23.02]
1/2
[12.70]
57/64
[22.62]
(3) 3/16 [4.76] HOLES
EQUALLY SPACED ON A
4.115 [104.52] BC
2-11/64
[55.17]
2-9/16
[65.09]
ш3-7/16
[Ш87.31]
1/2 NPT
25/64
[9.96]
1-41/64
[41.71]
2-41/64
[67.24]
21/32
[16.67]
57/64
[22.62]
21/32
[16.67]
29/32
[23.02] 1/2
[12.70]
2-11/64
[55.17]
3-11/32
[84.84]
3-1/2
[88.90]
7-3/4
[196.77]
3/8
[9.53]
Wall Mount Bracket
Duct Mount Bracket
DIN Mount Bracket
Modbus ® is a registered trademark of Schneider Automation, Inc.
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.