LORD V-Link-200, Руководство пользователя

Страница: 38 / 102

V-Link
®
-200
User Manual
6. Connecting Sensors
The V-Link-200 wireless sensor node features eightanalog input channels that interface with a wide range
of available sensor technologies, essentially converting them into wireless sensors. The node
accommodates Wheatstone Bridge and analog sensors for applications in wireless strain gauge
monitoring, such as torque, force, and pressure measurement, as well as sensors for other applications
like wireless accelerometers, vibration sensors, magnetic field and displacement sensors. Environmental
sensing can be achieved with wireless RTD and wireless thermocouple monitoring.
The V- Link- 200 includes four single ended and four differential channels for sensor measurement.
Differential channels may need to be factory-set to work for specific types of sensors. For information
about channel configurations see Differential Input Channels on page 43 . For ordering information see
Parts and Configurations on page 88
.
6.1 Sensor Requirements
Below are guidelines for selecting sensors for use with the V-Link-200. For interfacing with sensors
outside of these parameters, or not included in the examples in the following sections, contact
Technical Support (
see Technical Support on page 87
).
Sensor Impedance:
l
Differential sensor inputs using a Wheatstone Bridge must have an impedance that is ≥
120 Ω. For half-bridge and quarter-bridge configurations, the node impedance value is set
to match the sensor when the node is manufactured and must be specified at the time of
order. For more information
see Parts and Configurations on page 88
. Custom bridge
completion impedance values are available on request.
Sensor Signal Voltage:
l
Differential sensor inputs include a hardware gain and offset stage before the sensor input
signal is processed by the analog to digital voltage converter within the node. The
combination of the gain, offset, and sensor signal voltage cannot exceed the 5 V dc input
range of the analog to digital converter. For more information
see Differential Input Gain
and Offset on page 71 .
l
Single-ended sensor signal voltages are measured with respect to the system ground and
must be between -10.24 to +10.24 V dc.
Sensor Power:
l
The total current available for all connected sensors must be less than 150mA. The
voltage is 4.096 V dc.
38