6 Advanced installation details
6.1 Hardware switches
The electronics are equipped with four user-selectable hardware switches. These switches
set the Alarm Mode, Internal/External Analog Power, Transmitter Security, and Internal/
External Pulse Power.
Definitions of these switches and their functions are provided below. To change the
settings, see below.
6.1.1 Alarm mode
If an event occurs that would trigger an alarm in the electronics, the analog output will be
driven high or low, depending on the switch position. The switch is set in the HIGH
position when shipped from the factory. Refer to Table 8-1 and Table 8-2 for analog
output values of the alarm.
6.1.2
Transmitter security
The SECURITY switch allows the user to lock out any configuration changes attempted on
the transmitter.
• When the security switch is in the ON position, the configuration can be viewed but no
changes can be made.
• When the security switch is in the OFF position, the configuration can be viewed and
changes can be made.
The switch is in the OFF position when the transmitter is shipped from the factory.
Note
The flow rate indication and totalizer functions remain active when the SECURITY switch is
in either position.
6.1.3
Internal/external analog power
Note
With output option code B, the analog output can only be externally powered and there is
no ANALOG switch.
The 4–20 mA loop can be powered internally by the transmitter or externally by an
external power supply. The ANALOG switch determines the source of the 4–20 mA loop
power.
• When the switch is in the INTERNAL position, the 4–20 mA loop is powered internally
by the transmitter.
• When the switch is in the EXTERNAL position, a 10-30 VDC external power supply is
required. For more information about 4–20 mA external power, see Analog output.
Reference Manual Advanced installation details
00809-0100-8782 November 2019
Reference Manual 45
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