Omega FLR 1000, Руководство пользователя

Страница: 16 / 33

pg. 16 of 33
a) 0-5VDC Analog Outputs
By monitoring the voltage output signal it is possible to determine the flow
rate of the liquid. Units are configured so that an output signal of 5.0VDC
is provided when the maximum flow (i.e. Full Scale flow) is passing
through the unit. The output signal is linear and scaleable enabling
calculation of flow rates within the sensor’s range. For example:
For a flow range of 50-500ml/min:
At 500ml/min the output signal would be 5VDC
If the output signal were 3.5VDC then the flow rate would be:
(500 ÷ 5) × 3.5 = 350ml/min
If the maximum flow rate is exceeded non-linear and inaccurate readings
will result.
b) Pulse Outputs
By monitoring the Pulse output frequency it is possible to determine the
flow rate of the liquid. The pulse frequency for maximum flow through the
unit (i.e. full scale flow) is detailed on the calibration certificate. This
differs from unit to unit. This output is approximately linear and scaleable
within the sensor’s range. For example:
For a flow range of 1.0-10.0l/min:
The calibration certificate gives the following:
At 10.0l/min the pulse output signal is 312Hz
At 5.0l/min the pulse output signal is 150Hz
At 2.0l/min the pulse output signal is 58Hz
If the output signal were 120Hz then the flow rate would be:
(5.0 ÷ 150) × 120 = 4.0 l/min (using the closest calibration point)
c) 4-20mA Outputs
By monitoring the current output signal it is possible to determine the flow
rate of the liquid. Units are configured so that an output signal of 20mA is
provided when the maximum flow (i.e. Full Scale flow) is passing through
the unit. The output signal is 4mA when there is zero flow through the
unit. The output signal is linear and scaleable enabling calculation of flow
rates within the sensor’s range. For example: