Instructions for Use –SCHMIDT®LED Measured Value Display MD 10.015 Page 8
Analog output
The analog output of the MD 10.015 is galvanically isolated from its own
energy supply and the sensor supply (pin 13: Analog Out+; pin 12: Analog
Out–≙AGND; see Figure 2).
When using the display version with DC supply, the mass of the analog
output (AGND) can be connected to that of the operating voltage (GND).
However, the galvanic isolation is lost and a possible mass offset in the
connecting cable can lead to a distortion of the output signal.
When using the display version with AC supply, the analog output must
not be in contact with the supply voltage under any circumstances.
The load resistance RLhas to be connected to AGND:
Current mode: RL≤400
Voltage mode: RL≥1 k
In the configuration menu, beginning of signalization range without (0 mA
or 0 V) or with offset (signal transmitting zero point: 4 mA) can be selected.
5 Operating modes
The LED measured value display can be operated in three different modes
(parameter in configuration menu: “Selection of operating mode”).
Standard mode
In standard mode (setting: ) up to two sensor signals can be configured
independently of each other. The volume quantitiy can be determined from
the measured value of “Sensor 1”or the sum as well as the difference of
both sensor flow velocity signals.
Bidirectional modes
The SCHMIDT®LED Measured Value Display MD 10.015 and two uni-
directional SCHMIDT®chamber head flow sensors can be used in addition
to determine flow direction as well as flow volume from both directions.
The two sensors must be installed in the same tube at a distance of 10
times of the inner tube diameter and at an angle of 180° towards each
other (see Figure 4).
Flows in measuring direction of “Sensor 1”are evaluated by the measured
value display as positive flows.
