Document 9162
Manual - ST5484E 2-Wire Seismic Vibration Transmitter
Page 7 of 7
Rev. T (Oct 2013)
Metrix Instrument Company
8824 Fallbrook Drive
Houston, TX 77064 USA
(281) 940-1802
www.metrixvibration.com
[email protected]
Trademarks used herein are the property
of their respective owners.
Data and specifications subject to change
without notice.
© 2013 Metrix Instrument Company, L.P.
This output is an acceleration signal with a sensitivity of 100 mV/g, filtered to the same frequency band as used for the 4-
20mA velocity measurement (refer to options E and F in the product datasheet, document 1004457). Observe the following
when using this output:
•
Only an electrically-isolated or battery-powered portable vibration analyzer should be used when connecting to this
output. Since this is a loop- powered device, an external ground will affect the loop output and could cause a false
alarm.
•
When using a portable vibration analyzer or data collector, be sure to turn the instrument sensor power off.
•
Most portable vibration analyzers have a low input impedance and they will load
this signal, resulting in attenuation of as much as 20 to 30%. Refer to Table 1 at
right showing the nominal attenuation expected for a given input impedance.
•
In all cases for all locations, the use of this signal is for temporary connection only.
Permanent connection could violate hazardous location installation requirements.
•
Care should be exercised to avoid introducing electrical noise when using this
output.
•
Care should be exercised to avoid impacting the transmitter or introducing other
mechanical vibrations when connecting to this output. Such vibration could result
in spurious alarms or machinery trips.
•
When output is not in use, be sure leads cannot touch conduit or each other as this
will affect the 4-20 mA current output.
•
Do not use this output with leads longer than 5m (16 feet). Use of longer leads will introduce electrical noise and
attenuate high-frequency signal content that may be present in the raw acceleration signal.
9. Specifications, Ordering Information, and Outline Dimensional Diagrams
Refer to product datasheet 1004457.
Table 1
Input Impedance
of Analyzer
dB
Attenuation
10 MEG
0.01
5 MEG
0.02
2 MEG
0.04
1 MEG
0.09
500 K
0.18
200 K
0.43
100 K
0.84
50 K
1.61
20 K
3.57
10 K
6.10