Specifications and Ordering Information
Part Number 141486-01
Rev. D (04/07)
Page 1 of 7
1900/27 Vibration Monitor
BENTLY
NEVADA
VIBRATION MONITOR
IN/SEC
MM/SEC
OK ALERT DANGER BYPASS
DISPLAY MODE
NORMAL
ALERT
LEVEL
DANGER
LEVEL ALERT
ADJUST
DANGER
ADJUST RESET
BUFFERED
TRANSDUCER
1
0 1 2 3 4 5 6 NORMAL
BYPASS
RELAY MODE
ALERT & DANGER
TIME DELAY
00 3 SECONDS
01 5 SECONDS
10 10 SECONDS
11 15 SECONDS ALERT RELAY
DRIVE CONDITIONS
00 ALERT
01 ALERT OR
NOT OK
10 NOT OK
11 DANGER SELF T EST
0 OFF
1 ON
UNITS
0 ENGLISH
1 METRIC
MADE IN USA
Description
The 1900/27 is a single-channel, stand-alone, locally mounted vibration monitor.
It can be used as a stand-alone machinery protection device, suitable for
general-purpose or some essential machinery and provides a built-in 4-20 mA
interface for trending the monitored parameter in plant control and automation
systems. The 1900/27 accepts a single
transducer input from compatible
Trendmaster® 2000 accelerometers, conditions the signal into peak velocity
units, and provides local display and status indication as well as alarm relay
contact outputs for connection to an external annunciator.
By using an optional Rack Buffered Output Transducer Interface Module (TIM),
the 1900/27 can also be used in conjunction with our Trendmaster 2000 system.
It allows the user to apply machinery protection capabilities to all (or selected)
seismic vibration points of the Trendmaster 2000 system.
Note: If your application calls for connectivity to Bently Nevada’s Trendmaster 2000 system, but
does not require a 4-20 mA interface to other systems, consider the use of our 1900/25 monitor
instead (consult part number 141485-01 for details).
Caution
If housing measurements are being made for overall protection of the machine,
thought should be given to the usefulness of the measurement for each
application. Most common machine malfunctions (imbalance, misalignment, etc.)
originate at the rotor and cause an increase (or at least a change) in rotor
vibration. In order for any housing measurement alone to be effective for overall
machine protection, a significant amount of rotor vibration must be faithfully
transmitted to the bearing housing or machine casing, or more specifically, to
the mounting location of the
transducer.
In addition, care should be exercised in the physical installation of the
transducer. Improper installation can result in a decrease of the
transducer
amplitude and frequency response and/or the generation of signals, which do
not represent actual machine vibration.
Upon request, we can provide engineering services to determine the
appropriateness of housing measurements for the machine in question and/or
to provide installation assistance..
