Brooks® MT3750 meter operation is based on the variable area principle. The all metal
meter is ideal for a variety of gas and liquid applications. These meters are indispensable
where high pressure operating conditions exist.
The primary meter is available in 316L stainless steel construction. But corrosion resistant
materials of construction are available which makes it a perfect t for the metering of
aggressive applications.
A broad range of threaded connection sizes and types provide for exible installations.
The very popular mechanical indicator option does not require power which reduces
installation costs and is a cost-effective solution for ow measurement in hazardous areas.
Certied transmitters and alarms both ameproof and instrinsically safe are available for
hazardous installations anywhere in the world.
Product Description
The Brooks
wetted parts. The magnetically coupled indicator provides a highly reliable method of
indication. This model is a practical and economical approach to low ow rate indication
for high pressure and difcult to handle uids.
Optional accessories include 4-20 mA output, Needle Valve, Flow Controllers and Alarms.
®
Ar-MiteTM is a reliable, low ow metal tube owmeter with 316L stainless steel
Flowmeters
Features and Benets
Features Benets
®
Wetted Parts made from Stainless Steel or Monel
Ranges up to 100 I/h or 26 GPH Capable of measuring (very) low ows accurately
High Pressure and Temperature Rating Designed to work safely under difcult conditions
Miniature Size Compact even with process anges
Local Reading, Integral Control Valve, Needle Valve, Transmitter or Alarms, versatile product offering
Certied Ex-proof, Intrinsically safe ATEX, CSA, IECEx and NEPSI Approved
Compatible for a wide range of uids (liquids or gases)
1
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Product Specications / Capacities
Table 1 MT3750C Specications
Specications MT3750C
Measuring Range See Capacities Table 2
Rangeability 10:1 (most sizes)
Metering Tube 316L (stainless steel) Monel K-500
End Fittings 316L (stainless steel)
Monel K-500
Accuracy 5%, 3%, VDI/VDE class 4, 2.5
Repeatability 1% Full Scale
Scale Silver increments with black background - Aluminum Material (52 mm long), single or dual
1. Air ows in scfh converted to 70°F and 14.7 psia when the meter is operated at 70°F and 14.7 psia.
2. Air ows in m
3
n/h (converted to normal conditions: 0° and 1.013 bar abs) when the meter is operated at 1.013 bar abs and 20°C.
3. When the viscosity of the uid exceeds the viscosity immunity ceiling (VIC), a calculated correction is applied to account for the difference between factory
calibration uid and process uid.
2
(1, 2)
Limit
(3)
Drop
Page 3
Product Specications - Pressure / Temperature and Certications
Product Approvals - 3750
Table 3 MT3750C Pressure Ratings in PSIG (BarG)
Meter Pressure Rating
Type -58°F to 400°F / -50°C to 204°C
Standard Meter 1500 (100)
High Pressure Meter 4000 (276)
Table 4 MT3750C Fluid Temperature at Ambient Temperature
Max. Ambient Max. Fluid Temperature per Option
Temperature Indicator Alarm Transmitter
Enclosure contains glass & painted aluminum parts. If it is m ounted in an area where the use of
category 2G or 2D apparatus is required, it must be installed such that ignition source due to
propagating brush discharge sparks are excluded.
The actual maximum surface temperature of the equipment depends not on the equipment itself, but
on operating conditions of the process fluid/gas flowing through the equipment. The equipment by
itself does not generate heat. Due to this reason the temperature class is marked as TX. The
maximum permitted ambient and process temperature limits can be found in the operating
instructions.
At start up especially for gas applications, ensure that the pressure is graduall y increased through the
piping system. A sudden pressure spike situation may result in a fast movement of the float within the
VA flowmeter & the float may hit hard against the float stop.
Declaration
Declaration
Declaration - SEP
CRN
Declaration
DEKRA Certificate/ UL
DEKRA Certificate
CSA / UL Certificate
MBID 022
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Product Dimensions - Threaded Connections with Indicator Only
*Flow controller bracket not shown. Contact Brooks Instrument for drawing of ow controller with bracket.
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Page 5
Product Dimensions - Threaded Connections w/Transmitter or Inductive Alarm
*Flow controller bracket not shown. Contact Brooks Instrument for drawing of ow controller with bracket.
*Flow controller bracket not shown. Contact Brooks Instrument for drawing of ow controller with bracket.
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Product Specications - Transmitter
Mechanical
Transmitter
Inductive Switch
Alarm
Reed Switch Alarm
ATEX
IECEX
UL
NEPSI
Explosion safety
"Intrinsic Safety (ia)"
ATEX
IECEX
NEPSI
Explosion safety
"Non-sparking (nA)"
IECEX
Russia Custom Union
Excessive Pressure
Russia Custom Union
Explosion safety
II 2 G Ex ia IIC T6
II 2 D Ex iaD 21 IP66/IP67 T70°C, II 2 D Ex tD A21 IP66/IP67 T70°C
EN 60079-0:2006, EN 60079-11:2007
EN 61241-0:2006, EN 61241-11:2006
Ex d IIC T6 Gb
GB3836.1-2010 GB3836.2-2010
Ex ia IIC T6
IEC 60079-0:2004 IEC 60079-11:1999
Class I, II, III, Div.1, Groups A, thru G, T6
Class I, Zone 1 AEx ia IIC T6, Ex ia IIC T6
Ex ia IIC T6 Gb
Ex iaD 21 T70°C
GB3836.1/4-2010, GB 12476.4-2010
Ex nA II T6
Class I, Div.2, Grps A, B, C, and D;
Class II Grps F and G, T6
Class I, Zone 2 AEx nA II T6, Ex nA II T6
Custom Union including Russia
"On safety of the equipment for work in explosive environments"
ТR СU 012/2011 (TR CU Ex)
Custom Union including Russia
“On safety of the equipment operating under excessive pressure”
TR CU 032/2013
Meter Options
EX d IIC T6
IEC 60079-0:2004 IEC 60079-1:2003
Special conditions for safe use:
For information regarding the dimension of the flameproof joints the
manufacturer shall be contacted.
Class I, Div.1, Groups A, B, C, and D,T6
Class II, Div.1, Groups E, F, and G
Class I, Zone 1 AEx d IIC T6, Ex d IIC T6
II 2 G Ex d IIC T6
II 2 D Ex tD A 21 IP66 T 85°C
EN 60079-0:2006, EN 60079-1:2004, EN 61241-0:2006, EN 61241:2004
Special conditions for safe use:
For information regarding the dimension of the flameproof joints the
manufacturer shall be contacted.
Explosion safety
"Flame Proof"
Table x-xx Product Approvals - 3750 With Transmitter
Standards/Directives/MarkingApprovalsMark
KEMA 01ATEX2174
IECEx KEM 06.0049
UL File E73889
GYJ11.1638X
KEMA 01ATEX1033
IECEx KEM 06.0037
1292059
GYJ11.1637
IECEx KEM 06.0037
1292059
TC NRU Д-U.AУ04.B.05988
RU C-HU.ГБ08.B.00741
Declaration/Certificate
Table 7 Product Approvals - MT3750C with Transmitter
Description - Transmitter
The transmitter provides accurate magnet angle detection and
conversion to a 4 - 20 mA industry standard output signal,
based on the position of a oat assembly in the owmeter. This
rugged, compact, microprocessor-driven device is capable of
providing accurate ow information to your external support
systems. The patented magnetic sensor with automatic gain
control enables an extremely high dynamic capture range with-
out sacricing accuracy. (Reference Transmitter Wiring Diagram
on page 9)
Class I, Div 1, Groups A, B, C and D; Class II, Groups E, F and G; Class
III; Encl Type 4X
IS Entity Parameters: Vmax=30Vdc, Imax=100mA, Ci=0, Li=0
Class I, Div 2, Groups A, B, C and D; Class II, Groups E, F and G; Class
III; Encl Type 4X
Reed Switch Alarms are classified as “Simple Apparatus” when used in Intrinsically Safe circuits.
They comply with the requirements of EN60079-11 clause 5.7 – Simple apparatus.
Ambient Temperature ratings: -20° C ≤ Tamb ≤ 65° C
Input parameters: Vmax = 30V, Imax = 100mA, Ci = 0μF, Li = 0μH
Special conditions for safe use:
• The product should be installed by suitably trained personnel, in accordance with the applicable
code of practice.
• As the product has no source of internal heating, the temperature classification is dependent on the
ambient air temperature.
• Since part of flowmeter enclosure is made of painted aluminum, if it is mounted in group II, category
1 area, it must be installed such, that, ignition sources due to propagating brush discharge spar ks are
excluded
Table x-xx Product Approvals - 3750 With Inductive Alarm
Limit Switches - Inductive Alarm Switch
One or two electronic limit switches type SJ2-N can be installed
in the indicator housing to allow initiation of signaling or
switching functions on a preset ow value being reached. The
SJ2-N limit switch operates as a slot initiator that is inductively
actuated by a cam mounted to the pointer. Any ow value can
be used for setting the limit value by sliding the switch along
the slot in the mounting plate for the initiators. Minimum
setting distance between two limit switches is approximately
50% of the scale range.
Power supply 8 Vdc (Max. 15.5 Vdc)
Current consumption active area clear: > 3 mA
Current consumption active area obscured: < 1 mA
Self inductance 29 µH
Self capacitance 20 nF
Max Temp 158°F (70°C)
The ow valve can be used for setting the limit value by sliding
the switch along the slot in the mounting plate for the initiators.
Minimum setting distance between two limit switches is
approximately 50% of the scale range.
Table 9 Product Approvals - MT3750C With Inductive Alarm
II 2 G Ex ia IIC T6
II 2 D Ex ia D 21 IP65 T75°C
EN 60079-0:2006, EN 60079-11:2007
EN 61241-0:2006, EN 61241-11:2006
Ex ia IIC T6 Gb
Ex ia IIIC T 75°C Db IP65
IEC 60079-0:2007-10 , IEC 60079-11:2006 , IEC 61241-11:2005
Class I, II, III, Div.1, Groups A thru G, T6
Class I, Zone 0, Zone 1 AEx ia IIC, T6
Ex ia IIC T6
Ex ia IIC T6 Gb
GB3836.1-2010 GB3836.4-2010
Class I, II, III, Div. 2, Groups A thru G, T6
Class I, Zone 2 AEx nA II, T6
Ex nA II T6
Ex nA IIC T6 Gc
GB3836.1:2010; GB3836.8:2003
Custom Union including Russia
“On safety of the equipment operating under excessive pressure”
TR CU 032/2013
Custom Union including Russia
"On safety of the equipment for work in explosive environments"
ТR СU 012/2011 (TR CU Ex)
KEMA 02ATEX1126
IECEx KEM 09.0046
1379260
GYJ11.1639
1379260
GYJ13.1315
TC N RU ДU.AУ04.B.05988
RU C-HU.ГБ08.B.00741
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Model Code
Code Description Code Option Option Description
I. Base Model Number 3750C 55 mm, Armored Purge Flowmeter
II. Material Specication 1 316L Stn. Stl. & CRN Certication
4 316L Stn. Stl., CRN Certication & Section IX Welding
5 316L Stn. Stl., CRN Certication & Certied Material to EN 2.2/Section IX Welding
6 316L Stn. Stl., CRN Certication & Certied Material to EN 3.1/Section IX Welding
C 316L Stn. Stl., Certied material to EN 3.1
D 316L Stn. Stl. with Section IX Welding
E 316L Stn. Stl., Certied Material to EN 2.2/Section IX Welding
F 316L Stn. Stl., Certied Material to EN 3.1/Section IX Welding
G Monel K500
H Monel K500 Certied Material to EN 3.1
IV. Construction/Seals Construction Seals
A** Standard Design Viton O-rings
B Standard Design Teon O-rings (No Valve Only)
C Standard Design Buna O-rings
D** Standard Design Kalrez O-rings (With/Without Valve)
E Standard Design EPM O-rings
F Standard Design Teon in Meter and Kalrez in Valve
G All Welded/High Pressure No Elastomer - No Valve Cavity
V. Connection Size and Type 1** 1/4” NPT (F) - Integral
VI. Connection Orientation 1** Horizontal Inlet and Outlet (Threaded Connections Only)
VII. Valve Conguration A** No Valve (Standard Fitting with Plug)
VIII. Accuracy/Inscription/Fluid Accuracy Inscription Fluid
B** 4 VDI / 5% FS % Scale Liquid
E** 4 VDI / 5% FS Direct Reading GasF 4 VDI / 5% FS % Scale Liquid - High Viscosity
G 4 VDI / 5% FS Direct Reading Liquid - High Viscosity
K 2.5 VDI / 3% FS % Scale Gas
L 2.5 VDI / 3% FS Direct Reading Gas
M 2.5 VDI / 3% FS % Scale Liquid - High Viscosity
** Select meters ship in 5 days. Max order quantity = 5 meters. Consult factory on orders of more than 5 meters.
2 316L Stn. Stl., CRN Certication & Certied Material to EN 2.2
3 316 Stn. Stl., CRN Certication & Certied Material to EN 3.1
2 1/4” Tube Compression - With Adapter
3 6 mm Tube Compression - With Adapter
4 1/4” Rc (F) - With Adapter
5 1/2” NPT (F) With Adapter
6 3/4” NPT (F) - With Adapter
B** Low Flow Valve on Inlet - Typical for Sizes 0, 1, 2
C** Medium Flow Valve on Inlet - Typical for Sizes 3 & 4
D** High Flow Valve on Inlet - Typical for Sizes 5 & 6
ENo Valve Cavity - All Welded / High Pressure Only
K NRS Valve - Size 3 on Inlet - Typical for Sizes 0 & 1
L NRS Valve - Size 4 on Inlet - Typical for Size 2
M NRS Valve - Size 5 on Inlet - Typical for Size 3
N NRS Valve - Size 6 on Inlet - Typical for Sizes 4 & 5
P NRS Valve - Size 7 on Inlet - Typical for Size 6
T Mounted to 316L SS 8802 Flow Controller with Viton Diaphragm
U Mounted to 316L SS 8805 Flow Controller with Teon Diaphragm
V Mounted to 316L SS 8902 Flow Controller with Viton Diaphragm
W Mounted to 316L SS 8905 Flow Controller with Teon Diaphragm
1 Mounted to 316L SS 8802 Flow Controller with Teon Diaphragm
3 Mounted to 316L SS 8902 Flow Controller with Teon Diaphragm
9 N/A No Scale N/A
A N/A Blank Scale N/A
C** 4 VDI / 5% FS Direct Reading Liquid
D** 4 VDI / 5% FS % Scale Gas
H 2.5 VDI / 3% FS % Scale Liquid
J 2.5 VDI / 3% FS Direct Reading Liquid
N 2.5 VDI / 3% FS Direct Reading Liquid - High Viscosity
(Model Code continued on next page)
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Model Code (continued)
Code Description Code Option Option Description
IX. Electrical Output A** None
B Reed Switch Alarm, Meter Mounted
E Single Inductive Alarm with M20 x 1.5 Electrical Connection
F Single Inductive Alarm with 1/2” NPT (F) Electrical Connection
G Double Inductive Alarm with M20 x 1.5 Electrical Connection
H Double Inductive Alarm with 1/2” NPT (F) Electrical Connection
J Mat Transmitter with M20 x 1.5 Electrical Connection
K Mat Transmitter with 1/2” NPT (F) Electrical Connection
X. Alarm Relay/ A** NoneTransmitter Power Supply B Power Supply 24 Vdc with IS Barrier
C Power Supply 120 Vac with IS Barrier
D Power Supply 240 Vac with IS Barrier
E 24 Vdc 1 ChannelF 24 Vdc 2 Channel
G 120 Vac 1 Channel
H 120 Vac 2 Channel
J 240 Vac 1 Channel
K 240 Vac 2 Channel
XI. Certications/Approvals A** None
C Zone 1, Intrinsically Safe CENELEC - ATEX
D Zone 1, Flame-proof CENELEC - ATEX
E Division 2/Zone 2, Non-incendive CSA - USA and Canada (Transmitter 1/2” NPT & Alarms)
F Division 1/Zone 1, Intrinsically Safe CSA - USA and Canada (Transmitter 1/2” NPT & Alarms)
G Division 1/Zone 1, Explosion-proof/Flame-proof UL Listed - USA and Canada
H Zone 1 Intrinsically Safe NEPSI (China) (1/2” NPT and M20 Elec. Conn.)
J Zone 2 Non-sparking NEPSI (China) (1/2” NPT and M20 Elec. Conn.) - Alarm Only
K Zone 1 Flame-proof NEPSI - Transmitter Only (China) (M20 Elec. Conn. Only)
L Zone 1 Intrinsically Safe IECEx (World) (1/2” NPT and M20 Elec. Conn.)
M Zone 2 Non-sparking IECEx (World) - Transmitter Only (1/2” NPT and M20 Elec. Conn.)
N Zone 1 Flame-proof IECEx (World) - Transmitter Only (M20 Elec. Conn.)
P TR CU Ex Zone 2, Non-incendive/non-sparking (Customs Union including Russia) - Transmitter 1/2” NPT & Alarm
R TR CU Ex Zone 1, Flame-proof XP - IIC (Customs Union including Russia)
S TR CU Indicator only (Customs Union including Russia)
T Zone 1 Flame-proof - KOSHA (Korea)
U Zone 1/Zone 2 Non-Electrical ATEX
XII. Material Inspection A** None
1 NACE MR0175 MR0103 - 2.1 Certicate only (316L SS Construction Only)
2 Liquid Dye Penetrant Test Report - 3.1 (Welds Only) - (316L SS Construction Only)
3 Certied According to NACE MR0175 MR0103& Liquid Penetrant
4 International Calibration Certicate Includes Scale Check
5 ICC & NACE MR0175 MR0103
6 Positive Material Identication Report - 3.1
7 PMI & LDP
8 ICC & PMI
9 ICC, PMI & LDP
B LDP, ICC
C LDP, NACE MR0175 MR0103
D LDP, NACE MR0175 MR0103, PMI
E LDP, NACE MR0175 MR0103, PMI, ICC
F ICC, PMI, NACE
H LDP, ICC, NACE
XIII. Accessory A** None
B Flush Panel Mounting (Indicator and Threaded Connections Only)
C No Brooks Identication (Indicator Only)
D Degrease for Oxygen Service
E Commercial Clean
S Flush Panel Mounting & Degrease for Oxygen Service (Same as Option B)
T Flush Panel Mounting & Special Cleaning (Same as Option B)
XIV. Accessory Group 2 0** NoneB Bracket, FCA, Standard
C Bracket, FCA, Stainless Steel
D Dual Scale
E Dual Scale and Standard BracketF Dual Scale and SS Bracket
Sample Standard Model Code
I II III IV V VI VII VIII IX X XI XII XIII XIV
3750C A 2 A 1 1 A B A A A A A 0
** Select meters ship in 5 days. Max order quantity = 5 meters. Consult factory on orders of more than 5 meters.
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Brooks Service and Support
Brooks is committed to assuring all of our customers receive the ideal ow solution for their application, along with outstanding service and support to back it up. We operate rst class repair facilities located around the world to provide rapid response and support.
Each location utilizes primary standard calibration equipment to ensure accuracy and reliability for repairs and recalibration and is
certied by our local Weights and Measures Authorities and traceable to the relevant International Standards.
Visit www.BrooksInstrument.com to locate the service location nearest to you.
START-UP SERVICE AND IN-SITU CALIBRATION
Brooks Instrument can provide start-up service prior to operation when required. For some process applications, where ISO-9001
Quality Certication is important, it is mandatory to verify and/or (re)calibrate the products periodically. In many cases this service
can be provided under in-situ conditions, and the results will be traceable to the relevant international quality standards.
SEMINARS AND TRAINING
Brooks Instrument can provide seminars and dedicated training to engineers, end users, and maintenance persons.
Please contact your nearest sales representative for more details.
Due to Brooks Instrument’s commitment to continuous improvement of our products, all specications are subject to change without notice.