Emerson 3812 User Manual
16
Meter specifications
Section 1: Introduction
Daniel 3812 Liquid Ultrasonic Flow Meter Installation Manual
May 2015
3-9000-765 Rev H
Digital, analog, and frequency outputs
Frequency/Digital
Output(s)
Output(s)
The meter has user-configurable selections for either a frequency output or Digital status (FODO)
(Also
(Also
)
(3) Frequency/Digital Outputs
•
FODO1 (four possible output configurations)
•
FODO2(eight possible output configurations)
•
FODO3(eight possible output configurations)
Frequency or Digital Output parameter pairs (
Frequency or Digital Outputs (FODO 1) source selections:
•
(FO1A, DO1A, FO1B, DO1B)
Frequency or Digital Outputs (FODO 2) source selections
•
(FO1A, DO1A, FO1B, DO1B, FO2A, DO2A, FO2B, DO2B)
Frequency or Digital Outputs (FODO 3) source selections
•
(FO1A, DO1A, FO1B, DO1B, FO2A, DO2A, FO2B, DO2B)
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)
while reporting reverse flow)
•
Lead forward, Lag reverse (Phase B leads Phase A while reporting forward flow, lags Phase A
while reporting reverse flow)
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.
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.
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.
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.
only in the reverse direction.
Maximum frequency for the frequency outputs
•
1000Hz
•
5000Hz
Analog Output(s)
•
(1) 4-20 mA independently configurable analog output (HART)
(1) 4-20 mA independently configurable analog output (conventional)
The analog output zero scale offset error is within ±0.1% of full scale and gain error is within
±0.2% of full scale. The total output drift is within ±50 ppm of full scale per °C.
±0.2% of full scale. The total output drift is within ±50 ppm of full scale per °C.
Table 1-2 Meter specifications