Brooks MT3809G - 2-8 Installation of the Model MT3809 Flowmeter with Inductive Alarms

Installation and Operation Manual
X-VA-MT3809G-MT3810G-eng
Part Number: 541B182AAG
July, 2018
Models MT3809G & MT3810G
2-8 Installation of the Model MT3809 Flowmeter with Inductive Alarms (1 or 2 switches)
a. Install the meter as described in Section 2-5
b. Install the inductive alarms (1 or 2 switches) following the wiring
instructions given in Section 2-6 or 2-7, depending on the conguration
(with or without HART or FOUNDATION™ Fieldbus transmitter)
c. Intrinsically safe installations require the use of relay isolators for the
alarms and a barrier for the transmitter, if equipped. Power supply limits
and cable parameters must be as shown in the applicable installation
diagram from Section 2-6. or 2-7.
d. If the area classication is Division 2, the transmitter barrier and cable
parameters are not applicable. However for proper operation of the
inductive alarms, the relay isolators must be used. The electrical code will
require the use of conduit for wire protection.
e. For ameproof installation the optional explosion proof enclosure is
required and explosion proof installation methods must be followed. For
proper operation of the inductive switches, the relay isolators must be
used.
f. The shielded cable must be used for hook up. The shields should
beconnected to chassis ground at the transmitter/alarm end and should be
taped up and not connected at the receiver end. The taping and insulation
of the shields at the receiving end is especially important for intrinsically
safe installations.
g. The relay isolator has built in power handling contacts. Refer to the
specications for these ratings.
h. The pointer must be adjusted to the reference line on the scale using
the adjustment screw on the face of the pointer, next to the hub. See
Figure 2-16.
i. Proper operation of the inductive alarms can be determined by manually
rotating the mechanical pointer and observing the status lights on the relay
isolator. The small alarm pointers indicate the alarm trip points. Changes
to the set points can be made by loosening the pointer screws and
repositioning the pointers.