35
Endress+Hauser
HART Loop Converter HMX50
Selecting an Assignment
The values of the HART variables selected here (PV, SV, TV, QV) are monitored using a relay
contact output. The number of available variables depends on the HART field device. When
disabled is selected, the relay remains constant in a de-energized state.
1. Select the desired HART variable using the
▴ or ▾ buttons.
2. Confirm your selection with OK.
Defining Switching Characteristics
Selecting the switching characteristics defines the switching direction and the direction of
operation. See applications.
1. Select the switching direction min or max with the
▴ or ▾ buttons.
2. Confirm your selection with OK.
3. Select the direction of operation passive or active with the
▴ or ▾ buttons.
4. Confirm your selection with OK.
You can implement the following applications:
• Switching direction max, direction of operation active: alarm if there is a trip value
overrange, e. g., sounder on
• Switching direction max, direction of operation passive: switch off during trip value
overrange, e. g., pump, heating, ... off, for larger hysteresis Min-Max operation (pump,
heater, ... on/off)
• Switching direction min, direction of operation active: alarm if there is a trip value
underrange, e. g., sounder is on.
• Switching direction min, direction of operation passive: switch off during trip value
underrange, e. g., pump, heating, ... off, for larger hysteresis Min-Max operation (pump,
heater, ... off/on)
The exact switching characteristics of the device are shown in the following illustration:
BA00371FEN_1417.fm Page 35 Tuesday, August 15, 2017 4:08 PM
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