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Section 1 Introduction

Brooks

®

 Ar-Mite

TM

 MT3750C

7

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 flow 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 flow 

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 flow 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 1-9 Approvals - MT3750C With Inductive Alarm

Figure 1-6 Model MT3750C with 

Inductive Alarm

Mechanical

 

Tr

an

smi

tte

r

Indu

cti

ve 

Switch

 

Alar

m

Reed Switch Alar

m

Explosion safety

"Intrinsic Safety (ia)"

ATEX

KEMA 02ATEX1126

IECEX

IECEx KEM 09.0046

1379260

NEPSI

GYJ11.1639

Explosion safety

"Non-sparking (nA)"

1379260

NEPSI

GYJ13.1315

Russia Custom Union

Excessive Pressure 

TC N RU Д-

U.AУ04.B.05988

Russia Custom Union

Explosion safety 

RU C-HU.ГБ08.B.00741

Ex nA IIC T6 Gc

GB3836.1:2010; GB3836.8:2003

Standards/Directives/Marking

Mark

Declaration/Certificate

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

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)

Table x-xx Product Approvals -  3750 With Inductive Alarm

Approvals

Meter Options

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

Summary of Contents for Ar-Mite MT3750

Page 1: ...3750C Section 1 Introduction Ar MiteTM Low Flow Armored Flowmeter Installation Operation Manual Ar MiteTM Model MT3750 Metal Tube Flowmeter Ar MiteTM Model MT3750 Metal Tube Flowmeter with Transmitter...

Page 2: ...r electrical and pressure sources Operation 1 Slowly initiate flow into the system Open process valves slowly to avoid flow surges 2 Check for leaks around the flow meter inlet and outlet connections...

Page 3: ...3 Installation of Inductive Alarm 13 Installation of Reed Switch Alarm 16 Installation of Transmitter 19 Operation Section 3 Operating Procedure 23 Operation of Inductive Alarm 23 Operation of Transmi...

Page 4: ...ram 14 2 3 Inductive Switch Wiring 15 2 4 Reed Switch Alarm Wiring Using IS Barriers 16 2 5 Reed Switch Alarm Installation Using P F Relay Unit 17 2 6 Reed Switch Alarm Wiring Using P F Relay Unit 17...

Page 5: ...pressure and difficult to handle fluids Optional accessories include 4 20 mA output Needle Valve Flow Controllers and Alarms Specifications Pressure Equipment Directive PED 2014 08 EU Flowmeters metn...

Page 6: ...tches Transmitter 4 20 mA output Agency Approvals Refer to Tables 1 6 thru 1 9 Optional Equipment Cartridge or NRSTM valves Integrally mounted flow controllers Meter Meter Meter Meter Meter Flow Range...

Page 7: ...ion SEP CRN CRN IP66 67 NEMA 4X Declaration IP66 67 DEKRA Certificate UL IP65 DEKRA Certificate Type 4X CSA UL Certificate MBID 022 Explosion safety Constructional safety c ATEX EU Declaration of Conf...

Page 8: ...9 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...

Page 9: ...Section 1 Introduction Brooks Ar MiteTM MT3750C 5 Figure 1 3 Transmitter Wiring Diagram Figure 1 2 Power Supply vs Maximum Load Resistance...

Page 10: ...losion safety Intrinsic Safety ia 1788748 Explosion safety Non incendive 1788748 Explosion safety Intrinsic Safety ia Class I Div 1 Groups A B C and D Class II Groups E F and G Class III Encl Type 4X...

Page 11: ...C With Inductive Alarm Figure 1 6 Model MT3750C with Inductive Alarm Mechanical Transmitter Inductive Switch Alarm Reed Switch Alarm Explosion safety Intrinsic Safety ia ATEX KEMA 02ATEX1126 IECEX IEC...

Page 12: ...Section 1 Introduction Brooks Ar MiteTM MT3750C 8 Figure 1 7 Dimensions for MT3750C Threaded Connections Metal Tube Flowmeter with Indicator...

Page 13: ...Section 1 Introduction Brooks Ar MiteTM MT3750C 9 Figure 1 8 Dimensions for MT3750C Threaded Connections with Transmitter or Inductive Alarm...

Page 14: ...Section 1 Introduction 10 Figure 1 9 Dimensions for MT3750C Threaded Connections with Reed Switch Alarm Brooks Ar MiteTM MT3750C...

Page 15: ...Section 1 Introduction 11 Figure 1 10 Dimensions for MT3750C Panel Mounting Brooks Ar MiteTM MT3750C...

Page 16: ...acking materials Inspect for damaged or missing parts Recommended Storage Practice If intermediate or long term storage of equipment is required it is recommended that the equipment be stored in accor...

Page 17: ...s A Carefully remove the covers from each end of the flowmeter B Install the flowmeter with the inlet at the bottom and the outlet at the top C When installing the flowmeter in the process line follow...

Page 18: ...y parameters shown on drawing B If the area classification is a Division 2 or Zone 2 a barrier is not required Note however when intrinsic safe apparatus is used without barrier this apparatus may NOT...

Page 19: ...Section 2 Installation 15 Figure 2 3 Inductive Switch Wiring Brooks Ar MiteTM MT3750C...

Page 20: ...m printed circuit board is a three terminal block marked Alarm Circuit The middle terminal is marked Alarm In This terminal is common for both high alarm and low alarm applications A circuit is comple...

Page 21: ...Section 2 Installation Brooks Ar MiteTM MT3750C 17 Figure 2 4 Reed Switch Alarm Installation Using IS Barriers Ref No 981Z985 Rev G pg 1...

Page 22: ...eTM MT3750C 18 Figure 2 5 Reed Switch Alarm Installation Using P F Relay Unit Figure 2 6 Reed Switch Alarm Wiring Using P F Relay Unit Note CSA US and Cananda Approved installations refer to Figures 2...

Page 23: ...t required and cable parameters are not applicable The electrical code will require the use of conduit for wire protection Refer to Figure 2 7 C If the installation is to be protected by Division 1 an...

Page 24: ...Section 2 Installation 20 Figure 2 7 Transmitter Wiring Diagram for I S Systems Brooks Ar MiteTM MT3750C...

Page 25: ...Section 2 Installation 21 Figure 2 8 Transmitter Wiring Diagram for XP Systems Brooks Ar MiteTM MT3750C...

Page 26: ...Section 2 Installation Brooks Ar MiteTM MT3750C 22 Figure 2 9 Transmitter Wiring Diagram...

Page 27: ...he desired alarm flow rate E Move switch assembly until the metal initiator attached to the pointer is not inserted into the switch F Tighten the screw mounting the switch to the plate G Replace the i...

Page 28: ...Flow 40 70 Follow the row across to the column marked Jumpers In this case the jumpers required are J1 J4 and J6 Simply pull the jumpers out from their current positions and place them in the correct...

Page 29: ...flow alarm within a limited range of the maximum flow rate of the meter The dual setpoint alarm is set in the same manner as described in Section 3 4 Simply use two ohmmeters to observe the behavior...

Page 30: ...Section 3 Operation Brooks Ar MiteTM MT3750C 26 Figure 3 1 Reed Switch Alarm...

Page 31: ...Section 4 Maintenance Brooks Ar MiteTM MT3750C Section 4 Maintenance 27 General It is important that this device only be serviced by properly trained and qualified personel CAUTION...

Page 32: ...and alone device consult factory for more details PC interface is needed to calibrate the transmitter With this interface the transmitter can be connected to the serial RS232 port of a computer At pow...

Page 33: ...n 5 Parts List Section 5 Parts List 29 General When ordering parts please specify Brooks Serial Number Model Number Part Description Quantity Refer to Figure 5 1 and Tables 5 1 5 2 Brooks Ar MiteTM MT...

Page 34: ...Section 5 Parts List 30 Figure 5 1 Model MT3750 Exploded View Brooks Ar MiteTM MT3750C...

Page 35: ...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 Certification is important it is ma...

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