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 19: ...Section 2 Installation 15 Figure 2 3 Inductive Switch Wiring Brooks Ar MiteTM MT3750C...
Page 26: ...Section 2 Installation Brooks Ar MiteTM MT3750C 22 Figure 2 9 Transmitter Wiring Diagram...
Page 30: ...Section 3 Operation Brooks Ar MiteTM MT3750C 26 Figure 3 1 Reed Switch Alarm...
Page 34: ...Section 5 Parts List 30 Figure 5 1 Model MT3750 Exploded View Brooks Ar MiteTM MT3750C...