Brooks Instrument 3750 - Manual (Page 24)

2-4
Installation and Operation Manual
X-VA-MT3750C-eng
Part Number: 541B063AAG
April, 2014
Brooks ® Ar-Mite TM MT3750C
Section 2 Installation
A. For intrinsically safe operation (recognized by a BLUE COVER),
intrinsic safety barrier selection, cable parameters and power supply
limits must be in accordance with the entity 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 be considered as intrinsically safe.
This is because input protection diodes may be damaged without
affecting normal operation. It is the customers’ responsibility to clearly
mark the apparatus when intrinsic safety is no longer valid.
C. Connect the IS Alarm as shown in Figures 2-2 and 2-3.
2-9 Installation of Reed Switch Alarm
A. Install meter as described in Section 2-4.
B. For Factory Mutual Approved installations and for CSA/NRTL/C
Certified installations, refer to Figures 2-4 and 2-5. On the system
printed circuit board is a three terminal block marked “Alarm Circuit”.
The middle terminal is marked “Alarm In”. This terminal is common for
Figure 2-2 Inductive Switch Wiring Diagram
DUAL SWITCH:
RELAY SHOWN P.&F. TYPE KF**-SR2-EX2.W