Daniel 3812 Liquid Ultrasonic Flow Meter Installation Manual
Section 3: Electrical installation
3-9000-765 Rev H
June 2017
Frequency/Digital outputs
59
•
Digital output 2A is based on Digital output 2A content (Frequency Output 2 Validity and
Flow Direction)
•
Digital output 2B is based on Digital output 2B content (Frequency Output 2 Validity and
Flow Direction)
Mode options
•
Open Collector (requires external excitation supply voltage and pull-up resistor)
•
TTL (internally powered by the meter 0-5 VDC signal)
Channel B Phase options
•
Lag forward, Lead reverse (Phase B lags Phase A while reporting forward flow, leads Phase
A while reporting reverse flow)
•
Lead forward, Lag reverse (Phase B leads Phase A while reporting forward flow, lags Phase
A while reporting reverse flow)
Phase A and Phase B output (based on flow direction)
•
Reverse flow - output only reports flow in the reverse direction. For frequency outputs,
Phase B of the output is 90 degrees out of phase with Phase A.
•
Forward flow - output only reports flow in the forward direction. For frequency outputs,
Phase B of the output is 90 degrees out of phase with Phase A.
•
Absolute - output reports flow in both directions. For frequency outputs, Phase B of the
output is 90 degrees out of phase with Phase A.
•
Bidirectional - output reports flow on Phase A only in the forward direction and on Phase B
only in the reverse direction.
Maximum frequency for the frequency outputs
•
1000Hz
•
5000Hz
