Brooks Instrument MT3809G - Manual (Page 38)

2-8
Installation and Operation Manual
X-VA-MT3809G-MT3810G-eng
Part Number: 541B182AAG
September, 2013
Models MT3809G & MT3810G
Section 2 Installation
2. 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 installation diagram.
3. If the area classification 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.
4. For flameproof 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.
5. The shielded cable must be used for hook up. The shields should
connected 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.
6. The relay isolator has built in power handling contacts. Refer to the
specifications for these ratings.
7. 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.
8. 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.
2-9 Installation of the Model MT3809 Flowmeter with Transmitter and Digital Display and Inductive Alarms
a. Install the meter as described in Section 2-5
b. Install the transmitter as described in Section 2-6
c. Install the inductive alarms as indicated below Section 2-8