Sensors; Sensor Operating Limits; Sensor Handling - Emerson CSI 9420 Reference Manual

Setup
Tip
Power up wireless devices in order of proximity to the Smart Wireless Gateway, beginning with the
closest device to the gateway. This results in a simpler and faster network installation.
3.2

Sensors

Each of the CSI 9420 signal inputs uses accelerometers to make vibration measurements.
The term "sensor" applies to both an accelerometer and an accelerometer with embedded
temperature. The CSI 9420 uses special low-power sensors to reduce power consumption
and increase power module life. The sensor is available with or without embedded
temperature.
3.2.1

Sensor operating limits

Table 3-1:
Channel
Accelerometer 1
Accelerometer 2
Temperature 1
The accelerometers require a DC bias. The CSI 9420 provides the necessary bias and
measures it to verify correct sensor operation. The nominal bias voltage is 2.5 V. If the bias
voltage is outside of the 2–3 V range, the device generates a failed alert for the associated
sensor. The DC input range represents the operational DC range of the signal input. The AC
input range represents the operational AC range of the signal input.
3.2.2

Sensor handling

Note
Each sensor requires a standard 1/4–28-inch mounting location.
CAUTION!
Do not drop, hammer, or impact the sensor housing before, during, or after installation.
CAUTION!
Do not exceed the specified torque when tightening a stud-mounted sensor. Over-tightening a
sensor will damage the sensing element and void the manufacturer's warranty.
70
Sensor operational ranges
DC bias range
2–3 VDC
2–3 VDC
N/A
DC input range AC input range
0–5 VDC 0.5–4.5 V (+/-80 g's peak)
0–5 VDC 0.5–4.5 V (+/-80 g's peak)
-40°C to 125°C N/A
MHM-97408, Rev 15