128240-01 is Bently Nevada 3500/42M Prox/Seismic I/O Module with External Terminations. 128240-01 receives signals from the transducers and routes the signals to the Proximitor/Seismic Monitor 176449-02. 

External Termination I/O modules let you simplify the wiring to the I/O modules in a 3500 rack by using a 25-pin cable to route the signals from the four transducers and a nine pin cable to route the signals from the recorders to the I/O module.  This section describes the External Termination I/O modules available for use with the Proximitor/Seismic Monitor.  It also shows what these External Termination I/O modules look like, what the External Termination Blocks look like, and the pin outs of the cables that go between the External Termination I/O modules and the External Termination Blocks. 

The 3500 Monitoring System is a high precision instrument that requires no calibration.  The functions of monitor channels, however, must be verified at regular intervals.  At each maintenance interval, we recommend that you use the procedures in this section to verify the operation of all active channels in the monitor.  It is only necessary to verify the alarms and accuracy of channel proportional values that are active. 

Dimensions: 241.3 mm x 24.4 mm x 99.1 mm

Ordering Information:
3500/42-AA-BB

Related items:
3500/42-01-00 128229-01
3500/42-04-00 135489-01
3500/42-05-00 135489-02
3500/42-06-00 135489-03
3500/42-07-00 138708-01
3500/42-08-00 138700-01
3500/42-09-00 140471-01
3500/42-10-00 140482-01