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Daniel 3818 LNG Liquid Ultrasonic Meter Installation Manual Section 3: Electrical installation
3-9000-771 Rev A May 2012
Frequency/Digital outputs 49
Frequency or Digital Outputs (FODO 3) source
• FO1A, DO1A, FO1B, DO1B, FO2A, DO2A, FO2B, DO2B
• FO1A, DO1A, FO1B, DO1B, FO2A, DO2A, FO2B, DO2B
• Frequency output 1A is based on frequency content (Actual - Uncorrected Flow Rate)
• Frequency output 1B is based on frequency content and Frequency 1B Phase
• Frequency output 2A is based on frequency content (Actual - Uncorrected Flow Rate)
• Frequency output 2B is based on frequency content and Frequency 2B Phase
• Digital output 1A is based on Digital output1A content (Frequency 1A Validity and Flow
Direction)
• Digital output 2A is based on Digital output2A content (Frequency 1A Validity and Flow
Direction)
• Digital output 2A is based on Digital output 2A content (Frequency 2A Validity and Flow
Direction)
• Digital output 2B is based on Digital output 2B content (Frequency 2B 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