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330-668-1444Model DI-8B34-02
Isolated 0°C to +100°C (+32°F to +212°F) RTD 8B-style Amplifier
- 0°C to +100°C (+32°F to +212°F) input range
- Interfaces to 100Ω Platinum 2- or 3-wire RTDs
- Linearizes RTD Signal
- High Level Voltage Outputs
- 1500Vrms Transformer Isolation
- ANSI/IEEE C37.90.1 Transient Protection
- Input Protected to 240VAC Continuous
- 120dB CMR
- 70dB NMR at 60Hz
- Low Drift with Ambient Temperature
- CSA, FM and CE Certifications Pending
- Mix and Match Modules
- View Dimensions and pinout
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Description
DI-8B modules are an optimal solution for monitoring real-world process signals and providing high level signals to a data acquisition system. Each DI-8B34 module isolates, filters, amplifies, and linearizes a single channel of temperature input from an RTD and provides an analog voltage output.
RTD excitation is provided from the module using two matched current sources. When using a 3-wire connection, this method allows equal currents to flow through the sensor leads, cancelling the effects of lead resistances. The exciation currents are small (0.25mA) which minimizes the self-heating of the RTD.
Signal filtering is accomplished with a three-pole filter optimized for time and frequency response which provides 70dB of normal-mode-rejection at 60Hz. One pole of this filter is on the field side of the isolation barrier for anti-aliasing, and the other two are on the system side.
A special input circuit on the DI-8B34 module provides protection against accidental connection of power-line voltages up to 240VAC. Clamp circuits on the I/O and power terminals protect against harmful transients.
The modules are designed for installation in Class I, Division 2 hazardous locations and have a high level of immunity to environmental noise.
Accessories
Description
2-position analog I/O backplane, non-multiplexed. For use with DI-8B Modules. View the 8BP02 schematic or the 8BPxx schematic or download the pdf.
Description
4 channel backplane. Each module has its own analog bus. For use with DI-8B Modules. View the 8BP04 schematic or the 8BPxx schematic or download the pdf.
Description
8 channel backplane. Each module has its own analog bus. For use with DI-8B Modules. View the 8BP08 schematic or the 8BPxx schematic or download the pdf.
Description
16 channel backplane. Each module has its own analog bus. For use with DI-8B Modules. View the 8BP16 schematic or the 8BPxx schematic or download the pdf.
Description
5V DC Power Supply for use with both DI-5B and DI-8B Backplanes.
Specifications
| Input Range: | 0°C to +100°C (+32°F to +212°F) |
| Input Resistance: | Normal: 50MΩ Power Off: 200kΩ Overload: 200kΩ |
| Input Protection: | Continuous: 240VAC (240VAC between + and - -/+EXC/-EXC terminals. 120VAC between - and +EXC/- EXC terminals and between +EXC and -EXC terminals.) Transient: ANSI/IEEE C37.90.1 |
| Sensor Excitation Current: | 0.25mA |
| Lead Resistance Effect: | ±0.02˚C/Ω (Ω refers to the resistance in one lead) |
| CMV, Input to Output: | 1500Vrms max |
| Transient, Input to Output: | ANSI/IEEE C37.90.1 |
| CMR (50Hz or 60Hz): | 120dB |
| NMR: | 70dB at 60Hz |
| Accuracy: | ±0.10°C (Includes conformity, hysteresis, and repeatability.) |
| Stability: | Output Offset: ±20ppm/ºC Gain: ±50ppm/ºC |
| Noise: | Output, 100kHz: 200µVrms |
| Bandwidth, -3dB: | 3Hz |
| Response Time, 90% Span: | 150ms |
| Output Range: | 0 to +5V |
| Output Protection: | Transient: Continuous Short to Ground ANSI/IEEE C37.90.1 |
| Power Supply Voltage: | +5VDC ±5% |
| Power Supply Current: | 25mA |
| Power Supply Sensitivity: | ±25ppm/% |
| Mechanical Dimensions: | 1.11" × 1.65" × 0.40" (28.1mm × 41.9mm × 10.2mm) |
| Operating Temperature: | -40ºC to +85ºC |
| Storage Temperature: | -40ºC to +85ºC |
| Relative Humidity: | 0 to 95% Noncondensing |
| RTD Standards: | Type: 100Ω Pt Alpha Coefficient: 0.00385 |
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