Rosemount Model 8732C Integral Mount Magnetic Flowmeter System
2-2
PRE-INSTALLATION
There are several pre-installation steps that make the installation process
easier. They include identifying the options and configurations that apply
to your application, setting the hardware switches if necessary, and
consideration of mechanical, electrical, and environmental requirements.
Please remember that the flowtube liner is vulnerable to handling
damage. Never place anything through the flowtube for the purpose of
lifting or gaining leverage. Liner damage can render the flowtube useless.
Identify Options
and Configurations
Standard application of the Model 8732C includes a 4–20 mA output
and control of the flowtube coils. Other applications may require
one or more of the following configurations or options:
• Multidrop Communications
• Auxiliary Output
• Pulse Output
Additional options may also apply. Be sure to identify the options and
configurations that apply to your situation, and keep a list of them
nearby during the installation and configuration procedures.
Hardware Switches
The Model 8732C electronics board is equipped with three user-selectable
hardware switches: Failure Alarm Mode, Output Power Source, and
Software Lockout Mode. The standard configurations for these switches
when shipped from the factory are as follows:
Failure Alarm Mode: High
Output Power Source: Internal
Software Lockout: Off
Definitions of these switches and their functions are provided below.
If you determine that the settings must be changed, see Changing
Hardware Switch Settings on page 2-3.
Failure Mode If the Model 8732C experiences a catastrophic failure in the electronics,
the current output can be driven high (22.50 mA) or low (3.75 mA). The
switch is set in the High position when it leaves the factory.
Current Output Internally or
Externally Powered
The Model 8732C 4–20 mA loop may be powered internally or by an
external power supply. The Internal/External power supply switch
determines the source of the 4–20 mA loop power. Transmitters leaving
the factory are set in the Internal position.
The external power option is required for multidrop communications
applications. A 10–30 V dc external supply is required, and the switch
must be reset. For further information on 4–20 mA external power, see
Connect 4–20 mA Loop External Power Source on page 2-20.
Transmitter Security The Model 8732C has a switch that locks out any configuration changes
attempted on the transmitter. Any changes to the configuration are
disallowed whenever the switch is in the On position. However, the flow
rate indication and totalizer functions remain active.
With the switch in the On position, you may still access and review any
of the operating parameters and scroll through the available choices,
but no actual data changes are allowed.
The local operator interface (LOI) has a display lock function that will
restrict any changes to the configuration via the LOI only. (This
restriction applies to the totalizer functions as well.) This protection is
intended to prevent accidental activation of the optical LOI in the field.
Refer to page 3-5 for information about activating and deactivating the
display lock function. The display lock is not on when the Model 8732C
leaves the factory.
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