Bently Nevada 3500/62 Data sheet

3500/62 Process Variable Monitor

Datasheet

Bently Nevada Machinery Condition Monitoring

Description

The 3500/62 Process Variable Monitor is a 6-channel monitor
for processing machine critical parameters that merit
continuous monitoring, such as pressures, flows,
temperatures, and levels. The monitor accepts +4 to +20 mA
current inputs or any proportional voltage inputs between -10
Vdc and +10 Vdc. It conditions these signals and compares
the conditioned signals to user-programmable alarm
setpoints.

The 3500/62 monitor:

l Continuously compares monitored parameters

against configured alarm setpoints to drive alarms for
machinery protection.

l Provides essential machine information for both

operations and maintenance personnel.

141541 Rev. K

You can program the 3500/62 using the 3500 Rack
Configuration Software to perform either current or voltage
measurements. The 3500/62 offers I/O modules for three
signal input scenarios: +/-10 Volts DC, isolated 4-20 mA, or 4­20 mA with Intrinsically Safe zener barriers. The Internal Barrier
I/O provides external power input terminals to provide
intrinsically safe power to the 4-20 mA transducers

When used in a Triple Modular Redundant (TMR)
configuration, you must install Process Variable Monitors
adjacent to each other in groups of three. When used in this
configuration, the monitor employs two types of voting to
ensure accurate operation and to avoid loss of machinery
protection due to single-point failures.

Triple Modular Redundant (TMR)Units are no longer
available for purchase.

3500/62 Process Variable Monitor
Datasheet 141541 Rev. K

Alarms

Specifications

Inputs

Signal

+/-10 Vdc I/O -10 Vdc to +10 Vdc
4-20 mA Barrier I/O 4-20 mA DC
4-20 mA Isolated I/O 4-20 mA DC.
Voltage Compliance

(4-20 mA Barrier I/O 4­20mA out)

Isolation
(4-20 mA ISO I/O only)

Input Impedance

+/-10V I/O 1 MΩ
4-20 mA Barrier I/O 50 Ω
4-20 mA Isolated I/O 50 Ω
Power Consumption 7.0 watts, typical.
External transducer

Power (Internal Barrier
I/O Only)

Outputs

Front Panel LEDs

OK LED

TX/RX LED

Bypass LED

Indicates when the Process Variable
Monitor is operating properly.

Indicates when the Process Variable
Monitor is communicating with other
modules in the 3500 rack.

Indicates when the Process Variable
is in Bypass Mode.

13.66 V

500 volts

+24 Vdc. +/- 5% @ 250 mA
max. Fused

Alarm Setpoints

User can set Alert and Danger setpoints for the
value measured by the monitor. Alarms are
adjustable and can normally be set from 0 to
100% of full-scale for each measured value. The
exception is when the full-scale range exceeds
the range of the sensor in which case the
setpoint will be limited to the range of the
sensor. Accuracy of alarms is to within 0.13% of
the desired value. The Process Variable Monitor
has both under and over alarm setpoints.

Alarm Time Delays

User can use software to set alarm delays as
follows:

Alert

Danger

Number of

Active

Channels

0 270
1 360
2 450
3 540
4 630
5 720
6 810

From 1 to 60 seconds in 1 second
intervals.

From 1 to 60 seconds in 0.5 second
intervals or to the minimum alarm
time delay.

Minimum Time Delay (ms)

Signal Conditioning

Specified at +25 °C (+77 °F). Full-scale range for
each channel is set in the field via 3500
Configuration Software. No calibration is
required.

Accuracy

Full Scale
Range

Within ±0.33% of full-scale typical,
±1% maximum.

Maximum 20,000 units mapped over
the input signal span. Minimum
input signal span for voltage input is
2 volts.

You can also set the Danger time delay at a
millisecond interval that varies from 270 to 810
milliseconds, depending on the number of active
channels. The millisecond danger interval is
determined as follows:

270ms minimum time + (90ms x number of active
channels)

As more channels are used, the alarm time delay
increases. The configuration software will
indicate the minimum alarm time delay based
on the channel loading.

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3500/62 Process Variable Monitor
Datasheet 141541 Rev. K

Proportional Values

Proportional values are Process Variable
measurements used to monitor the machine.
The Process Variable Monitor returns current or
voltage proportional values in a variety of
different units that are configurable.

Environmental Limits

Operating
Temperature

Operating
Temperature

Storage
Temperature

Humidity 95%, noncondensing.

-30°C to +65°C (-22°F to +149°F)
when used with Internal/External
Termination I/O Module.

0°C to +65°C (+32°F to +149°F) when
used with Internal Barrier I/O Module
(Internal Termination).

40°C to +85°C
(-40°F to +185°F).

Monitor Module

Dimensions
(height x
width x
depth)

Weight 0.82 kg (1.8 lbm)

I/O Modules (without barriers)

Dimensions
(height x
width x
depth)

Weight: 0.20 kg (0.44 lbm)

I/O Module (with barriers)

Dimensions
(height x
width x
depth)

Weight 0.46 kg (1.01 lbm)

241.3 mm x 24.4 mm x 241.8 mm

9.50 in x 0.96 in x 9.52 in)

241.3 mm x 24.4 mm x 99.1 mm
(9.50 in x 0.96 in x 3.90 in)

241.3 mm x 24.4 mm x 99.1 mm
(9.50 in x 0.96 in x 3.90 in)

Rack Space Requirements

Monitor
Module

I/O Modules 1 full-height rear slot.

1 full-height front slot.

3/8