Pfm Output (Electronic Insert Fel67) - Endress+Hauser Liquiphant FTL63 Operating Instructions Manual

Liquiphant FTL63
Endress+Hauser
6.3.5

PFM output (electronic insert FEL67)

• For connection to Endress+Hauser Nivotester switching units FTL325P and FTL375P
• PFM signal transmission; pulse frequency modulation, superimposed on the power
supply along the two-wire cabling
• Functional testing without level change:
• A functional test can be performed on the device using the test button on the
electronic insert.
• The functional test can also be prompted by disconnecting the supply voltage or
triggered directly by the Nivotester FTL325P and FTL375P switching unit.
Supply voltage
U = 9.5 to 12.5 V
DC
The device must be powered by a voltage supply categorized as "CLASS 2" or "SELV".
Comply with the following according to IEC/EN61010-1: provide a suitable circuit
breaker for the device.
Power consumption
P ≤ 150 mW with Nivotester FTL325P or FTL375P
Behavior of output signal
• OK status: MAX operating mode 150 Hz, MIN operating mode 50 Hz
• Demand mode: MAX operating mode 50 Hz, MIN operating mode 150 Hz
• Alarm: MAX/MIN operating mode 0 Hz
Terminals
Terminals for cable cross-section up to 2.5 mm
Overvoltage protection
Overvoltage category I
Electrical connection
2 (14 AWG). Use ferrules for the wires.
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