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LF-Series Flowmeters: Sensor/Transmitter Installation 73
Dimensions and Specifications
I/O Wiring – DIN CIO Return PolicySpecificationsI/O Wiring – DIN AN
Table A-10 FM transmitter electrical connections
Input and output connections One (output option codes 6 and 7), two (output option codes 1 and 3), or three
(output option code 4) pairs of wiring terminals for transmitter outputs
Screw terminals accept one or two solid conductors, 14 to 12 AWG
(2,0 to 3,5 mm
2
); or one or two stranded conductors, 22 to 14 AWG
(0,34to2,5mm
2
)
Power connections One pair of wiring terminals accepts AC or DC power
One internal ground lug for power-supply ground wiring
Screw terminals accept one or two solid conductors, 14 to 12 AWG
(2,0 to 3,5 mm
2
); or one or two stranded conductors, 22 to 14 AWG
(0,34to2,5mm
2
)
Service port connection Two clips for temporary connection to the service port
Sensor connection Two pairs of terminals for the 4-wire connection to the sensor
• One pair is used for the RS-485 connection to the sensor
• One pair is used to supply power to the sensor
Plug connectors accept stranded or solid conductors, 24 to 12 AWG
(0,2 to 2,5 mm
2
)
Table A-11 FM transmitter input/output signals
All transmitters One 4-wire sensor signal input connection with ground
Output option code 1 or 3
(1 mA, 1 FO)
One active 4–20mA output
• Not intrinsically safe
• Isolated to ±50 VDC from all other outputs and earth ground
• Maximum load limit: 600 ohms
• Flow-only transmitter can report mass flow or volume flow
• Multivariable transmitter can report mass flow, volume flow, density, temperature,
or drive gain
• Output is linear with process from 3.8 to 20.5 mA, per NAMUR NE43 (June 1994)
One active or passive frequency/pulse output
• Not intrinsically safe
• Can report mass flow or volume flow, which can be used to indicate flow rate or
total
• Flow-only transmitter: frequency output reports the same flow variable as the mA
output
• Multivariable transmitter: frequency output is independent of the mA output
• Scalable to 10,000 Hz
• Maximum output of +24 VDC ±3% with a 2.2 kohm internal pull-up resistor
Output is linear with flow rate to 12,500 Hz