Scanner 2000 Steam Mass Flow Transmitter ... - Spirax Sarco

Appendix A Scanner ® 2000 microEFM
Turbine Flowmeter Input 2
Turbine Input 2 (Figure A.17) accepts a turbine flowmeter input signal generated by a magnetic pickup.
The Scanner 2000 can be configured to use this signal to calculate and display instantaneous flow rates and
accumulated totals. Turbine Input 2 is in addition to the turbine input on the main circuit board. When the
expansion board is installed, a differential pressure flow run and two turbine runs can be monitored and
logged simultaneously.
A-12
TURBINE INPUT (TB9)
TB4
Expansion
Board PN:
9A-30160014
TB8 TB7
TB9
Figure A.17—Turbine Input 2 wiring
27
TB6
TB5
28
BLACK
RED
B
A
TURBINE
MAGNETIC PICKUP
Analog (4-20 mA) Output
The 4-20 mA output provides a linear current output that can be configured using ModWorX Pro software to
represent any parameter in the holding registers. This output requires a two-conductor cable to be connected
to an 8 to 30 VDC power supply (voltage required is dependent on loop resistance) and a current readout
device to be located in the remote location. See the ModWorX Pro Software User Manual for information on
configuring zero and full-scale values using ModWorX Pro software.
The graph below the wiring diagram in Figure A.18, page A-13 shows the minimum voltage required to power the
instrument for a given loop resistance. In addition, the mathematical relationship between loop voltage and
load resistance is given. For example, if a power supply voltage of 24 volts is available to power the current
loop, the maximum load resistance would be 800 ohms.