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330-668-1444Model DI-8B35-01
Isolated -100°C to +100°C (-148°F to +212°F) RTD 8B-style Amplifier
- -100°C to +100°C (-148°F to +212°F) input range
- Interfaces to 100Ω Platinum 4-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 Module Types
- 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-8B35 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 a precision current source. Excitation current does not flow in the input signal leads, which allows RTD measurements to be made independent of lead resistance. The exciation currents are small (0.25mA) which minimizes 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-8B35 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: | -100°C to +100°C (-148°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: | ±0.005˚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: | ±0.20°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 |
Articles
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