Rosemount 2240S, Справочное руководство, Страница: 32 / 100

Reference Manual
300550en, Rev AA
December 2010
Rosemount 2240S
4-6
Section 4. 2240S Installation
4.4 ELECTRICAL INSTALLATION
4.4.1 Cable/Conduit
Entries
The electronics housing has five entries for ½ - 14 NPT glands. Optional
M20×1.5, minifast and eurofast adapters are also available.
For remote mounting, the nut and sleeve on the Rosemount 2240S can be
replaced with a M32 gland for connection of temperature sensors/WLS.
Connections must be made in accordance with local or plant electrical codes.
Make sure that unused ports are properly sealed to prevent moisture or other
contamination from entering the terminal block compartment of the electronics
housing.
NOTE!
Use the enclosed metal plugs to seal unused ports. The plastic plugs
mounted at delivery are not sufficient as seal!
NOTE!
It is recommended that a sealant of type PTFE is used to prevent water
ingress and to enable future removal of the plug/gland.
Figure 4-1. Cable entry with
NPT threaded gland
Ensure that glands for the cable entries meet the following requirements:
• IP class 66 and 67
• material: metal (recommended)
4.4.2 Power
Requirements
The Rosemount 2240S is powered over the Tankbus by the Rosemount 2410
Tank Hub. The 2240S has a current consumption of 30 mA.
4.4.3 Grounding
The housing should always be grounded in accordance with national and
local electrical codes. Failure to do so may impair the protection provided by
the equipment. The most effective grounding method is direct connection to
ground with minimal impedance.
There is an external grounding screw located at the bottom of the housing and
three internal grounding screws located inside the housing, see Figure 4-2 on
page 4-7. The internal ground screws are identified by a ground symbol:
.
Use the external ground terminal on the transmitter to ground the housing.
The NPT threaded gland leaves a
number of threads outside the housing