Bently Nevada 1900/27 Specifications

1900/27 Vibration Monitor

BENTLY

NEVADA

VIBRATION M ONITOR

IN/SEC

MM/SEC

OK ALERT DANGER BYPASS

DISPLAY MOD E

NORMAL

ALERT

LEVEL

DANGER

LEVEL

ALERT

AD

JUST

DANGER

ADJUST

RESET

BUFFERED

TRANSDUCER

1

0 1 2 3 4 5 6

NORMAL

BYPASS

RELAY MODE

ALERT & DANG ER

TIME DELAY

00 3 SECONDS

01 5 SECONDS

10 10 SECOND S

11 15 SECOND S

ALERT RELAY

DRIVE COND ITIONS

00 ALERT

01 ALERT OR

N

OT OK

10 NOT OK

11 DANGER

SELF TEST

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..

Specifications and Ordering Information

Part Number 141486-01

Rev. D (04/07)

Page 1 of 7

Specifications

Inputs

Compatible
transducers

Bently Nevada 200150 and
190520 Accelerometers.

Input Sensitivity

100 mv/g

Maximum
acceleration

20 g peak

Maximum
differential
input voltage

4 volts peak to peak

Power

AC/HDC Power
Version

AC Voltage:

85 to 264 Vac

DC Voltage:

110 to 370 Vdc

Current Draw:

60 mA. typ.

120 mA max.

Frequency:

47 Hz to 440 Hz, or DC.

Inrush:

20A typ. @ Vin=100Vac

40A typ. @ Vin=200Vac

+24 Vdc Power
Version

Signal Conditioning

Monitor Full-scale:

(Below 614Hz)

English Units:

2.0 in/s zero-to-peak

Metric Units:

50.8 mm/s zero-to-peak

Note: Full scale is limited by maximum input above 614 Hz. The
maximum input is 2 volts peak, or 20 g peak. 20 g at 614 Hz is
equivalent to 2 inch per second (the full scale range of the
monitor). For frequencies above 614 Hz, Full scale is equal to
(1228/frequency).

Frequency
Response:

High pass corner
frequency

-3 dB corner @ 8 Hz less than 1%
error due to high pass corner
above 30 Hz

Low pass corner

Greater than 4 kHz
less than 1% error due to low
pass corner below 4kHz

Accuracy

Liquid Crystal
Display and
Buffered output.

30 Hz – 4 kHz:

±3% of full scale, Maximum

8 Hz – 30 Hz

-30% , + 3% of full scale

4-20 mA Recorder.

30 Hz – 4 kHz:

±5% of full scale, Maximum

8 Hz – 30 Hz

Voltage:

Current Draw:

18 to 36 Vdc

300 mA max.

-30% , + 5% of full scale

Outputs

Buffered Transducer Output

Output Sensitivity:

19.7 mV/mm/s (500 mV/in/s)

Specifications and Ordering Information

Part Number 141486-01

Rev. D (04/07)

Page 2 of 7

Output Impedance:

Full-scale Range:

4-20 mA Output

Full-scale Range:

Overrange:

Accuracy:

Galvanic Isolation:

Relays

Type

Contact Ratings

Switched
Power:

Maximum
Voltage and
Current

Dielectric
Strength
(at sea level):

Life Expectancy

Electrical:

Displays

Liquid Crystal
Display

500 Ω

50.8 mm/s (2 in/s) zero-to-peak

20 mA @

50.8 mm/s (2 in/s)

63.5 mm/s (2.5 in/s)

Adjusted with trimpot

Optical @ 1000 Vac or 707 Vdc

Single-pole, double-throw.

180 watts, 1800 VA Maximum

300 Vac at 6 A

28 Vdc at 6 A

Contact to Contact: 750 Vrms

Contact to Coil: 1500 Vrms

180,000 operations at 6 A, 120
Vac

Size:

50.8 mm wide x 22.8 mm high

(2.0 inches wide x 0.9 inches high)

Full-scale:

50.8 mm/s (1.999 in/s)

Refresh Rate:

0.8 s

LED Indicators

OK:

One constant ON green LED
indicates OK condition of monitor,
transducers, and field wiring.
Constant OFF indicates NOT OK
condition. OK LED flashing at 2 Hz
indicates monitor has been NOT
OK, but is now OK.

Alert:

One yellow LED indicates an Alert
condition. Flashing at 2 Hz
indicates an Alert condition has
occurred and gone away. (Only
occurs when the Alert relay is
configured as nonlatching.)

Danger:

One of the two red LEDs indicates
a Danger condition. Flashing at 2
Hz indicates a Danger condition
has occurred and gone away.
(Only occurs when the Danger
relay is configured as
nonlatching.)

BYPASS:

The other red LED indicates the
monitor is in BYPASS mode.

Controls

Display Mode
Switch:

Three positions: Normal, Alert
Setpoint, and Danger Setpoint.
Controls what is shown on the
LCD display.

Relay Mode
Switch:

Specifications and Ordering Information

Part Number 141486-01

Rev. D (04/07)

Page 3 of 7