Bently Nevada 3500/65 Data sheet

3500/65 Channel Temperature Monitor

Datasheet

Bently Nevada Machinery Condition Monitoring

Description

The 3500/65 monitor provides 16 channels of temperature
monitoring and accepts both resistance temperature
detector (RTD) and isolated tip thermocouple (TC)
temperature inputs. The monitor conditions these inputs and
compares them against user-programmable alarm
setpoints.

The monitor is programmed using the 3500 Rack
Configuration Software. You can configure the 16-Channel
Temperature Monitor to accept isolated tip thermocouples,
3-wire RTD, 4-wire RTD, or a combination of TC and RTD inputs.

In Triple Modular Redundant (TMR) configurations, you must
install temperature monitors in groups of 3 adjacent
monitors. In this configuration the monitor uses 2 types of
voting to ensure accurate operation and to avoid single­point failures.

172930 Rev. J

3500/65 Channel Temperature Monitor
Datasheet 172930 Rev. J

Platinum RTDs with α = 0.00385 are the

Specifications

Inputs

worldwide industrial standard and are
the recommended RTDs for all
applications.

Power
Consumption

Signal Accepts from 1 to 16 RTD or

Input
Impedance

3 watts nominal

isolated tip TC transducer
signals.

Greater than 1 MΩ for each
lead input.

Transducers

TCs

Type E

Type J

Type K

Type T

-100°C to +1000°C,
(-148°F to +1832°F)

0°C to +760 °C
(32°F to +1400 °F)

0°C to +1370°C
(32°F to +2498°F)

-160°C to +400°C,
( -256°F to +752°F)

Outputs

Front Panel LEDs

OK LED Indicates when the 3500/65 is

operating properly.

TX/RX LED Indicates when the 3500/65 is

communicating with other
modules in the 3500 rack.

Bypass LED Indicates when the 3500/65

monitor is in Bypass Mode.

RTD
Current­Source
Value

913 ± 7 µA @ 25°C per transducer
(1 supply for the 4-wire RTD and
2 supplies for the 3-wire).

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

RTDs 

100 Ω 3-wire and
4-wire platinum
RTD (α =

0.00385)
100 Ω 3-wire and

4-wire platinum
RTD (α =

0.00392)

120 Ω 3-wire and
4-wire nickel
RTD

10 Ω 3-wire and
4-wire copper
RTD



-200°C to +850°C
(-328°F to +1562°F)

-200°C to +700°C
(-328°F to +1292°F)

-80°C to +260°C
(-112°F to +500°F)

-100°C to +260°C,
(-148°F to +500°F)

RTDs and TCs

Resolution 1°C or 1 °F.

Accuracy

Internal
Termination

External
Termination

Bulkhead Rack: ±3°C at +25°C
(±5.4°F at +77°F).

Standard Rack: ±3°C at +25°C
(±5.4°F at +77°F).

Bulkhead Rack: ±3°C at +25°C
(±5.4°F at +77°F)

Standard Rack: ±3°C at +25°C
(±5.4°F at +77°F)

Cold Junction Compensation
Sensor (used for TC
measurements) ±2°C at +25°C
(±3.6°F at +77°F).

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3500/65 Channel Temperature Monitor
Datasheet 172930 Rev. J

Alarms

Alarm
Setpoints

Alarm
Time
Delays

Alert
Delay

Danger
Delay

You can use software
configuration to set Alert and
Danger setpoints for the value
measured by the monitor. Alarms
are adjustable 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 this case,
software will limit the setpoint to
the range of the sensor. Accuracy
of alarms are to within 0.13% of the
desired value. The 3500/65 16­channel temperature monitor has
both under- and over-alarm
setpoints.

You can use software to program
alarm delays as follows:

From 1 to 60 seconds in 1-second
increments.

From 1 to 60 seconds in 0.5­second increments or set to the
minimum alarm delay of 225 mS.

Proportional Values

Proportional values are temperature
measurements used to monitor the machine.
The 16-channel temperature monitor returns
temperature proportional values.

Environmental Limits

Operating
Temperature:

Storage
Temperature:

-30°C to +65°C (-22°F to
+150°F)

-40°C to +85°C (-40°F to
+185°F)

Physical

Main Module

Dimensions
(Height x
Width x
Depth)

Weight 0.91 kg (2.0 lbs.).

I/O Modules

Dimensions
(Height x
Width x
Depth)

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)

Weight 0.45kg (1.0 lb.).

Rack Space Requirements

Main
Module

I/O Modules 1 full-height rear slot

1 full-height front slot

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