Specifications

Reference Manual
MHM-97408, Rev. 2
June 2008
CSI 9420
3-2
MOUNTING
Introduction To reduce power consumption and increase power module life, the CSI 9420
uses a special low-power sensor. This sensor is available with or without
embedded temperature. Refer to Appendix A: Specifications and Reference
Data for a complete list of available sensor options.
Please contact your local sales representative for detailed ordering
information.
To maintain mechanical isolation of the sensor a Remote Mount configuration
is required. For Remote Mount, the sensor is mounted separately from the
CSI 9420 housing, then connected to the CSI 9420. Although not required for
all installations, it is common to run the cable from the sensor to the housing
through conduit.
Operating Limits Each of the CSI 9420 signal inputs uses accelerometers to make vibration
measurements. Alternately, an accelerometer with embedded temperature
may be used.
NOTE
The word “sensor” refers to both an accelerometer and an accelerometer with
embedded temperature. The word “accelerometer” refers to a sensor that
measures only acceleration.
The operational ranges for the sensors are shown in Table 3-1.
Table 3-1. Sensor ranges
The accelerometers require a DC bias. The CSI 9420 device provides the
necessary bias and measures it to verify correct sensor operation. The
nominal bias voltage is 2.5 volts. If the bias voltage is outside of the 2 - 3 volt
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.
GENERAL SENSOR
HANDLING
INSTRUCTIONS
Each sensor requires a standard 1/4” - 28 mounting location. Detailed
mounting instructions are provided in subsequent sections of this manual.
Channel DC Bias Range DC Input Range AC Input Range
Accelerometer 1 2 - 3 Vdc 0 - 5 Vdc 0 - 5 V (+/-100 gs peak)
Accelerometer 2 2 - 3 Vdc 0 - 5 Vdc 0 - 5 V (+/-100 gs peak)
Temperature 1 N/A -40 to +150 °C N/A
Do not drop, hammer, or impact sensor housing before, during, or after installation.
Do not exceed specified torque when tightening a stud-mounted sensor. Over-tightening a
sensor will damage the sensing element and void the manufacturer’s warranty.