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Signal Conditioning Module DI-8B34
Levertijd:
3~4 weken
SKU
DI-8B34
DI-8B34 Linearized 2- or 3-wire RTD Input Module
● Interfaces to 100Ω Platinum RTDs
● Linearizes RTD Signal
● High Level Voltage Outputs
● 1500 Vrms Transformer Isolation
● ANSI/IEEE C37.90.1 Transient Protection
● Input Protected to 240 VAC Continuous
● 120 dB CMR
● 70 dB NMR at 60 Hz
● Low Drift with Ambient Temperature
● CSA, FM and CE Certifications Pending
● Mix and Match Modules
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.
Art.nr.
DI-8B34
Fabrikant
Dataq Instruments
Land van herkomst
Verenigde Staten
Input Range
-100°C to +100°C (DI-8B34-01)
0°C to +100°C (DI-8B34-02)
0°C to +200°C (DI-8B34-03)
0°C to +600°C (DI-8B34-04)
0°C to +100°C (DI-8B34-02)
0°C to +200°C (DI-8B34-03)
0°C to +600°C (DI-8B34-04)
Bandwidth
-3dB | 3Hz |
Output Range
0 to +5V
Sensor Excitation Current
0.25mA
Algemeen
Input Resistance |
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Input Protection |
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Lead Resistance Effect | ±0.02˚C/Ω² | ||||||
CMV, Input to Output | 1500Vrms max | ||||||
Transient, Input to Output | ANSI/IEEE C37.90.1 | ||||||
CMR (50Hz or 60Hz) | 120dB | ||||||
NMR | 70dB at 60Hz | ||||||
Accuracy³ |
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Stability |
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Noise (Output, 100kHz) | 200μVrms | ||||||
Response Time, 90% Span | 150ms | ||||||
Output Protection (Transient) | ANSI/IEEE C37.90.1 (Continuous Short to Ground) | ||||||
Power Supply Voltage | +5VDC ±5% | ||||||
Power Supply Current | 25mA | ||||||
Power Supply Sensitivity | ±25ppm/% | ||||||
Dimensions | 28.1 x 41.9 x 10.2mm | ||||||
Operating Temperature | -40ºC to +85ºC | ||||||
Storage Temperature | -40ºC to +85ºC | ||||||
Humidity | 0 to 95% Noncondensing | ||||||
RTD Standards |
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¹240VAC between + and - -/+EXC/-EXC terminals. 120VAC between - and +EXC/-EXC terminals and between +EXC and -EXC terminals. | |||||||
²Ω refers to the resistance in one lead. | |||||||
³Includes conformity, hysteresis and repeatability. |