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Integral High PressureBlowdown SystemFor the MST2400 Series
Thermo's MST2400 Loop Powered
Multivariable SMARTFLOW�
Transmitter can now becombined with an Integral High Pressure Blowdown
System which is specifically designed to clean out PitotAveraging Air/Gas Flow meters used in processes withheavy particulate loading. This unique combination of-fers the end user the most versatile, reliable,cost-effective and simplest loop powered multivariabletransmitter in the industry in combination with an eco-nomical and efficient method of maintaining the processunder adverse conditions all in a single enclosure.
The MST2400 is capable of being programmed toperform a blowdown sequence from once every 2 min-utes to once every 24 hours. The sequence can also beactivated by a remote pulse from a DCS or other control-ler. During a blowdown sequence, the MST2400 will“Hold” the last output signal so as not to disrupt the pro-cess. The MST2400 then activates a combination ofvalves to first isolate the transmitter from the processlines and then send a “Purge Blast” of high pressure airthrough the pitot array to clear the ports of particulate.Once the “Purge Blast” is completed, the MST2400 is re-connected to the process and the output signal “Hold” ishalted.
SpecificationsFUNCTIONAL SPECIFICATIONS
Purge AirRequirements:
Use plant air supply approximately 80 to 100 psig. Forpressures over 100 psig, a regulator must be used. Airshould be clean and dry.
Electric Power: 120 Volts AC. An internal 24VDC power supply is fur-nished with the blowdown system.
Note: The power supply furnished with the integralblowdown system can not be used to power the MST2400’sLoop signal.
ActivationPulse Signal:
Contact closure for ½ second (500 milliseconds). Willnot disrupt MST2400 programmed timed sequence.
BlowdownSequenceDuration:
Approximately 30 seconds from time signal is held tillsignal is restored. High and Low legs of the pitot arrayare alternately purged for approximately 11 secondsper leg.
PHYSICAL SPECIFICATIONS
Enclosure: NEMA 4X Fiberglass. MST2400 only.
ProcessConnections:
¼” NPT Female. Stainless Steel.
Supply AirConnection:
¼” NPT Female. Stainless Steel.
ElectricalConnections:
½” conduit, Liquid Tite.
Other enclosure options and pneumatic / electrical connec-tion sizes possible. Consult Factory.
LINE INSTALLATION
Line Size: High Pressure Supply: ½” Tube.
The process tubing diameter line size and lengths from FlowStation to MST2000 Transmitter depend on span of DPTransmitter. Consult factory for installation assistance.
Features
�Provides a High Pressure Purge Blast
through a Pitot Array to clear ports of partic-
ulate.
�Integrated in a single enclosure with theMST2400 Multivariable SMARTFLOW Trans-mitter for simple, easy installation.
�MST2400 “Holds” the last signal before the“Purge Blast” so as not to disrupt the pro-cess.
�Blowdown Sequence is controlled by theMST2400 and can be programmed from onceevery 2 minutes to once every 24 hours orcan be activated by a pulse signal from aDCS or controller.
�NEMA 4X Enclosure.
�80-100 PSIG Supply Air Required.
�Low Cost.
MST2400 with Integral Blowdown System
Note: Do not use Blowdown PowerSupply for MST2000 Loop Power
OutputSignal
Process PurgeTo LOW on Probes
Process PurgeTo HI on Probes
High PressureSupply Air
or Inert Gas
3
1
4
2
Integral24VDC
Power Supply
No
tU
se
d
110 VAC In 24VDC Out
Neutral GroundLine -+
MST2000 Multivariable SMARTFLOW TransmitterTM
RESET
MODE INC.
EDIT DEC.
BlowdownAlarm
Auto ZeroRun
RESET RESET
ABS. PRES.
STATUS STATUS STATUS
RESET
EXT. TEMP. EXT. DP
Brandt Instruments, Inc. Fuquay, North Carolina USA� �
RTDSENSENRTDLOOP EXTIN 3EXTIN 2EXTIN 1 DO 1DI 1 DO 2 RX/TX+ + + + + + + + + +
_ _ _ _ _ _ _ _ _ _
TE
ST
_
+Brandt Instruments, Inc., Fuquay, North Carolina 27526 USA (919) 552-9011 www.brandtinstruments.comr r r
Model: MST2111002S1P 4-20mA Loop PoweredSerial Number: 2002001 Range: 0 to 0.25 Inches W.C
Temp.Abs.Prs
MST2000 Transmitter
+ DI 1 - + DO 1-+EXTIN 3-RTD-LOOP+ SEN-SEN+RTD+LOOP- +EXTIN 2-+EXTIN 1- + DO 2 - GNDRX/TX+ RX/TX-
ExtDP
HOLD
0.250-
-
Available with the MST2400 Series Only. Other Standalone Blowdown Systems avail-able .See the MST2000 Multivariable SMARTFLOW
®Transmitter specification sheet, or
contact the factory, for further information and details
Remote Activation Wiring
MST2400: NEMA 4X Fiberglass Enclosurewith Integral High Pressure Blowdown System
0.25 Inch Dia.Mounting Holes (4X)
Recessed Captive Screws
Window
Electrical ConnectionsLocated on MST20001/2" Conduit Connection
1/2" ConduitConnectionfor 120VAC
13.688 Inches
347.68 mm
11.688 Inches
296.88 mm
1/4"NPTF Process Connections
1/4"NPTF Air Supply80 to 100 PSIG
13.188 Inches
334.98 mm
Bottom View
Top View
Front View
OutputSignal
120VPower
HI LOW SUPPLY
15.188 Inches385.8 mm
7.125 Inches
180.98 mm
Optional 2.5" Pipe Mount
Side ViewWith Optional 2.5" Pipe Mount
RTD-LOOP+ SEN-SEN+RTD+LOOP- +EXTIN 3-+EXTIN 2-+EXTIN 1- + DO 1-+ DI 1 - + DO 2 - GNDRX/TX+ RX/TX-
MST2000 Multivariable SMARTFLOW TransmitterTM
RESET
MODE INC.
EDIT DEC.
BlowdownAlarm
Auto ZeroRun
RESET RESET
ABS. PRES.
STATUS STATUS STATUS
RESET
EXT. TEMP. EXT. DP
Brandt Instruments, Inc. Fuquay, North Carolina USA� �
0.250INWC
RTDSENSENRTDLOOP EXTIN 3EXTIN 2EXTIN 1 DO 1DI 1 DO 2 RX/TX+ + + + + + + + + +
_ _ _ _ _ _ _ _ _ _
TE
ST
_
+Brandt Instruments, Inc., Fuquay, North Carolina 27526 USA (919) 552-9011 www.brandtinstruments.com� � �
Model: MST2111002S1P 4-20mA Loop PoweredSerial Number: 2002001 Range: 0 to 0.25 Inches W.C
Abs.Prs Temp. ExtDP
-
Brandt Instruments, Fuquay, North Carolina 27526, USA
(919) 552-9011
Brandt
MST24111002S1PSerial No:200020010 to 0.25 INWC4-20 mA Loop Powered
Dimensions
.
MD37-2000-BD, August 2000. All specifications subject to change without notice.
wwww.thermo.comLet us point you in the right direction.
S O 9 001
The DI1 (Digital In) connectionaccepts TTL level signals (isolated)or dry contact closures. If TTLsignals are used, the groundconnection be floatingand isolated from the 4-20mAloop connections.
The DO1 (Digital Out) connection isa MOSFET open drain style output.External ground connections mustbe floating and isolated from the4-20mA loop connections.
The MST2000 Blowdown issupplied with an internal powersupply, this power supply isisolated and can be used to provideisolated power connections tothe external alarm circuit. Do notuse it to supply power to the LoopSignal.
must
+DI1-
+DI1-
External SwitchOr
Relay Contact
External 24vPower Supply
To BlowdownControl Valves
To ExternalControl Device
External TTL StyleOutput From DCS
Floating Input Circuit of DCS*May Require ExternalPull-up Resistor
Blowdown ExternalTrigger Options
External AlarmControl Options
DI1 Circuit Inside
DO1 Circuit Inside
+DO1-
+DO1-
-
+
DCS
V+
*
+ -
MST2000 Multivariable SMARTFLOW TransmitterTM
RESET
MODE INC.
EDIT DEC.
BlowdownAlarm
Auto ZeroRun
RESET RESET
ABS. PRES.
STATUS STATUS STATUS
RESET
EXT. TEMP. EXT. DP
Brandt Instruments, Inc. Fuquay, North Carolina USA� �
RTDSENSENRTDLOOP EXTIN 3EXTIN 2EXTIN 1 DO 1DI 1 DO 2 RX/TX+ + + + + + + + + +
_ _ _ _ _ _ _ _ _ _
TE
ST
_
+Brandt Instruments, Inc., Fuquay, North Carolina 27526 USA (919) 552-9011 www.brandtinstruments.comr r r
Model: MST2111002S1P 4-20mA Loop PoweredSerial Number: 2002001 Range: 0 to 0.25 Inches W.C
Temp.Abs.Prs
MST2000 Transmitter
+ DI 1 - + DO 1-
V+
+
+
-
-+EXTIN 3-RTD-LOOP+ SEN-SEN+RTD+LOOP- +EXTIN 2-+EXTIN 1- + DO 2 - GNDRX/TX+ RX/TX-
ExtDP
I
Thermo Electron Corpoation1410 Gillingham Lane
Sugar Land, Texas 77478Telephone: (713) 272-0404 Facsimile: (713) 272-2273
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