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Model DI-5B35N-01

Isolated 0-300°C 4-wire RTD 5B-style Amplifier

$255 each
  • 0°C to +300°C (32°F to +572°F)
  • Interfaces to 4-wire 120Ω Nickel, α = 0.00672 RTDs
  • Linearizes RTD Signal
  • High Level Voltage Outputs
  • 1500 VRMS Transformer Isolation
  • ANSI/IEEE C37.90.1-1989 Transient Protection
  • Input Protected to 240VAC Continuous
  • 160dB CMR
  • 95dB NMR at 60Hz, 90dB at 50Hz
  • CSA Certified
  • View Dimensions and pinout
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DI-5B DAQ Amplifiers
This amplifier module measures 0°C to +300°C (+32°F to +572°F).This amplifier module supports 120Ω Ni RTDs.This amplifier module has 4Hz bandwidth.This data acquisition system has a 30-day Money back guaranteeThis amplifier is manufactured in the United States of America


In RTD temperature measurement applications requiring a very high level of accuracy, the DI-5B35 4-Wire RTD input module offers a significant advantage over 3-wire measurement techniques (see block diagram). The DI-5B35 measures only the voltage dropped across the RTD and almost completely ignores the resistance or length of the RTD lead wires. The DI-5B34 3-Wire RTD module provides lead resistance compensation, but requires equal lead resistances, while the DI-5B35 does not require matched lead resistances.

Each DI-5B35 RTD input module provides a single channel of RTD input which is filtered, isolated, amplified, linearized, and converted to a high level analog voltage output. This voltage output is logic switch controlled, which allows these modules to share a common analog bus without the requirement of external multiplexers.

The DI-5B modules are designed with a completely isolated computer side circuit which can be floated to ±50V from Power Common, pin 16. This complete isolation means that no connection is required between I/O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin to I/O Common, pin 19. RTD excitation is provided from the module by a precision current source. The excitation current is available on two leads which are separate from the two input signal measuring leads. The excitation current does not flow in the input signal leads, which allows RTD measurement to be totally independent of lead resistance. The excitation current is very small (0.25mA for 100Ω Pt and 120Ω Ni, and 1.0mA for 10Ω Cu) which minimizes self-heating of the RTD.

Signal filtering is accomplished with a six-pole filter which provides 95dB of normal-mode-rejection at 60Hz and 90dB at 50Hz. Two poles of this filter are on the field side of the isolation barrier, and the other four are on the computer side. After the initial field-side filtering, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ±5%.

A special input circuit on the DI-5B35 modules provides protection against accidental connection of power-line voltages up to 240VAC.



16-Position Backplane

$ 409
16-channel backplane for 5B modules


16-channel backplane for 5B modules. Each module has its own analog bus. For use with DI-5B Modules.


1-Position Backplane

$ 55
Single-channel backplane for 5B modules


Single-channel backplane. For use with DI-5B Modules.


2-Position Backplane

$ 129
Dual-channel backplane for 5B modules


Dual-channel backplane. For use with DI-5B Modules.


8-Position Backplane

$ 305
Dual-channel backplane for 5B modules


8-position analog I/O backplane, non-multiplexed. For use with DI-5B Modules.


Base Element

$ 10
Base element with snap foot


Base element with snap foot required for use with models DI-5B03 and DI-5B04 Backplanes. For use with DI-5B Modules.


Power Supply

Power Supply


5V DC Power Supply for use with both DI-5B and DI-8B Backplanes.


Side Element

$ 5
Side element


Side element required for use with models DI-5B03 and DI-5B04 Backplanes. For use with DI-5B Modules and Backplanes.


Input Range: 0°C (32°F) to +300°C (+572°F)
Output Range: 0 to +5V
Accuracy: ±0.40°C (Includes conformity, hysteresis, and repeatability.)
Input Resistance: Normal: 50MΩ
Power Off: 40kΩ
Overload: 40kΩ
Input Protection: Continuous: 240Vrms max
Transient: ANSI/IEEE C37.90.1-1989
Sensor Excitation Current: 0.25mA
Lead Resistance Effect: ±0.0005°C/Ω
(“Ω” refers to the resistance in one lead.)
CMV, Input to Output: Continuous: 1500Vrms max
Transient: ANSI/IEEE C37.90.1-1989
CMR (50 or 60Hz): 160dB
NMR: 95dB at 60Hz, 90dB at 50Hz
Conformity Error: ±0.05% Span
Stability: Input Offset: ±0.02°C/°C
Output Offset: ±20µV/°C
Gain: ±50ppm of reading/°C
Noise: Input, 0.1 to 10Hz: 0.2µVrms
Output, 100kHz: 200µVrms
Bandwidth, –3dB: 4Hz
Response Time, 90% Span: 0.2s
Output Range: 0V to +5V
Output Resistance: 50Ω
Output Protection: Continuous Short to Ground
Output Selection Time (to ±1mV of VOUT): 6µs at Cload = 0 to 2000pF
Output Current Limit: ±14mA max
Output Enable Control: Max Logic “0”: +0.8V
Min Logic “1”: +2.4V
Max Logic “1”: +36V
Input Current, “0,1”: 0.5µA
Power Supply Voltage: +5VDC ±5%
Power Supply Current: 30mA
Power Supply Sensitivity: 0.2°C/V
Environmental: Operating Temperature: -40ºC to +85ºC
Storage Temperature: -40ºC to +85ºC
Relative Humidity: 0 to 95% Noncondensing
RFI Susceptibility: ±0.5% Span Error at 400MHz, 5W, 3ft
Mechanical Dimensions: 2.28" × 2.26" × 0.60"
(58mm × 57mm × 15mm)

* At standard 60Hz factory calibration. For 10 to 100% rated span. Add an additional 0.25% error for 0 to 10% Span measurements. Accuracy includes nonlinearity, hysteresis and repeatability but not source or external shunt inaccuracy (if used).