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Signal Conditioning Module DI-8B38-35
DI-8B38 Strain Gage Input Module (Wide (8kHz) and Narrow (3Hz) Bandwidth)
● Provides gain and excitation for strain gage-based transducers (load cells, pressure sensors, torque meters, etc.)
● Interfaces to 100Ω Thru 2kΩ Full-Bridge Strain Gages (model dependent)
● High Level Voltage Outputs
● 1500Vrms Transformer Isolation
● ANSI/IEEE C37.90.1 Transient Protection
● Input Protected up to 240VAC Continuous
● 100dB CMR
● 3Hz or 8kHz Signal Bandwidth
● ±0.05% Accuracy
● ±0.02% Linearity
● Low Drift with Ambient Temperature
● UL, 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-8B38 module isolates, filters and amplifies a full-bridge strain gage input signal and provides an analog voltage output.
The 8B38 can interface to tranducers with a nominal resistance of 100Ω to 2kΩ depending upon the model. Bridge excitation is provided from the module with a stable 10.00V or 3.33V source. Full scale sensitivities of 2mV/V and 3mV/V are offered as standard.
Signal filtering is accomplished with a five-pole filter optimized for time and frequency response which provides 100dB per decade of normal-moderejection above the filter cutoff frequency. One pole of this filter is on the field side of the isolation barrier for anti-aliasing, and the other four are on the system side.
A special input circuit on the DI-8B38 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.
Isolation is provided by optical coupling to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ±5%.
The modules are designed for installation in Class I, Division 2 hazardous locations and have a high level of immunity to environmental noise.
0°C to +100°C (DB-8B35-02)
0°C to +200°C (DB-8B35-03)
0°C to +600°C (DB-8B35-04)
-3dB | 3kHz |
Input Resistance |
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Input Protection |
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Lead Resistance Effect | ±0.005˚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. |