Model 8712C/U/H Magnetic Flowmeter Transmitters
2-4
Hardware
Jumpers/Switches
The Model 8712C/U/H electronics board is equipped with
three user-selectable hardware switches (see Figure 2-2). These
switches set the Failure Alarm Mode, Internal/External Analog Power,
and Transmitter Security.
Definitions of these switches and their functions are provided below. If
you determine that the settings must be changed, see below.
Failure Alarm Mode If the Model 8712C/U/H experiences a catastrophic failure in the
electronics, the current output can be driven high (23.25 mA) or low
(3.75 mA). The switch is set in the HIGH (23.25 mA) position when it is
shipped from the factory.
Internal/External Analog Power The Model 8712C/U/H 4–20 mA loop may be powered internally
or by an external power supply. The internal/external power supply
jumper determines the source of the 4–20 mA loop power.
Transmitters are shipped from the factory with the jumper 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 jumper
must be reset. For further information on 4–20 mA external power, see
Connect 4–20 mA Loop External Power Source on page 2-10.
Transmitter Security There is a jumper on the Model 8712C/U/H that allows the user to lock
out any configuration changes attempted on the transmitter. No
changes to the configuration are allowed when the jumper is in the ON
position. The flow rate indication and totalizer functions remain active
at all times.
With the jumper 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. Transmitter security is
set in the OFF position when shipped from factory.
Hardware
Switch
Standard Configuration
(as shipped from factory)
Failure Alarm Mode: HIGH
Internal/External
Analog Power: INTERNAL
Transmitter Security: OFF
To Next Page
Loading...
