LORD V-Link-200, Руководство пользователя

Страница: 64 / 102

V-Link
®
-200
User Manual
7.1.3 Manufacturer Calibration
NODE: V-Link-200 ,18 bit (262144 A/D values)
CHANNEL TYPE: differential analog input, 0 to 5 V dc input range
SENSOR TYPE: pressure transducer, voltage output, positive going
SENSOR PARAMETERS:
From the manufacturer calibration sheet included with the sensor;
sensor range: 0-250 psi
sensor zero load output: 0.0032 V dc
sensor full scale output (FSO) with 10V excitation: 86.07 mV
From the application parameters;
sensor excitation in application: scaled to 4.096 V
DESIRED OUTPUT: engineering units (EU), psi
CALCULATIONS:
Because the sensor will be powered from the node with 4.096 V, and the sensor manufacturer
calibrated it a 10 V, the manufacturer full scale output (FSO) value needs to be scaled to 3V.
(4.096 V/10 V) * 86.07 mV = 35.25 mV
Select a gain and offset scale value appropriate for the sensor. ( See Differential Input Gain and
Offset on page 71 ).
The closest gain setting that accommodates 35.25 mV is +/- 39.0 mV. Using a lesser value would
exceed the input voltage capacity of the node when the sensor is at higher pressures. For more
information about gain values and associated input ranges,
See This table lists the gain settings
available on the V-Link-200 differential input channels. The scaled input range is the approximate
signal range of a sensor that would work with that gain, without considering the offset setting. on
page 72
Multiply the sensor FSO by the gain setting to get the sensor voltage after amplification. For this
example, the range is 39.0 mV for a gain of 64.
64 * 35.25 mV = 2.256 V
64