Brooks MT3809G - Page 35

Installation and Operation Manual
X-VA-MT3809G-MT3810G-eng
Part Number: 541B182AAG
July, 2018
Models MT3809G & MT3810G
v. Staying below the maximum allowable cable length which depends
upon the cable capacitance and the number of network devices. Most
installations are well within the 3000 meter (10,000 ft) theoretical limit for
HART communication. However, the electrical characteristics of the cable
(primarily its capacitance) and the number of connected devices can
affect the maximum allowable cable length. Detailed information for
determining the maximum cable length for any HART network
conguration can be found in the HART Physical Layer Specications.
c) The housing of the transmitter should be grounded in accordance with
the applicable installation regulations. When the device is not sufciently
grounded via the process cables, a grounding terminal screw is available
on the transmitter housing for earth connection.
d) Transmitter wiring connection diagrams are given in Sections 2-6-1.
(4-20 mA/HART Transmitter Instrinsically Safe Installation), 2-6-2. (4-
20mA/HART Transmitter Division 2 Installation) and 2-6-3. (4-20mA/HART
Transmitter Flameproof Installation). Ensure that the installation complies
with given hazardeous area protection requirements.
i. Intrinsically safe installations require the use of barriers, power supply
limits and cable parameters as shown in the installation diagram. All
connections are made in the transmitter housing.
ii. If the area classication is Division 2, barriers are not required and
cable parameters are not applicable. However, the electrical code will
require the use of conduit for wire protection.
iii. For ameproof installation the optional explosion proof enclosure is
required and explosion proof installation methods must be followed
iv. For both Division 1 explosion proof and Division 2 non-incendive
installations, the barriers shown in the installation drawings are optional.
Transmitter with alarm and pulse output wiring connections
The alarm contact and pulse output digital signals are electrically
identical, independent, optically coupled transistor outputs. Wiring will be
as required by the external driven system - Prover, DCS/PLC, terminal-
automation system, batch controller etc. These can be wired as an open
collector or open signal on the high or low side of voltage-rail within the
receiving equipment, depending upon the signal needs. When interfacing
to external electronics, be careful to work within the voltage/current
polarity and limits as specied in Section 1.
e) Common transmitter parameters are set during manufacturing at
Brooks Instrument based on order information, meter conguration
or defaults inherent to the transmitter. Further detailed congurations
as well as on-line monitoring can be done through standard HART or
Foundation™ Fieldbus communication protocol, see Section 3-3. for
details.