The 8B can interface to a broad spectrum of analog signals, including millivolt, volt, milliamp, thermocouple (linearized and nonlinearized), RTD, potentiometer, slidewire, strain gage, frequency, and 2-wire transmitter. Available analog output modules provide a wide selection of current and voltage output ranges.
Voltage input conditioners accept signals from +/-10mV to +/-60V, and current input conditioners accept signals of 0/4 to 20mA. Accepted thermocouple types are J, K, T, R, and S. Type Pt 100 RTDs can be 2-, 3-, or 4-wire. Potentiometer inputs can range from 0-100 ohms to 0-10k ohms. Strain gage transducers can have a resistance range of 100 ohms to 10k ohms, with sensitivities of 2mV/V, 3mV/V, or 10mV/V. Frequency input signals can be TTL or zero crossing with ranges from 0-500Hz to 0-100kHz. The 2-wire transmitter module provides loop power and accepts a 4 to 20mA input signal.
Additional models offer isolated field-side current and voltage outputs. Current output ranges are 0 to 20 and 4 to 20 milliamp, while voltage output ranges are 0 to 10V and +/-10V. Accuracy rating is +/-0.05%. Linearity is +/-0.02%. All modules have excellent stability over time and do not require recalibration.
Linearization of thermocouple signals is accomplished by a hardware implemented piece-wise approximation technique. The difference between sensor nonlinearity and the linearization provided by the 8B module is specified as conformity error. 8B modules use up to five segments to correct nonlinearity, which results in conformity errors as low as +/-0.015% span. Cold junction compensation error for thermocouple inputs is +/-0.5°C at 25°C ambient.
Signal bandwidth is 3Hz for most models, the exceptions being 100Hz for current output modules and 20kHz for high bandwidth voltage input modules. Output noise is as low as 250µVrms on the low bandwidth models.
Each 8B module isolates the field-side input or output signal with an optical isolation barrier rated at 1500Vrms. Common-mode rejection is 120dB; by incorporating a 3-pole filter, normal-mode rejection is 70dB at 60Hz. Additionally, field-side inputs or outputs are protected against accidental connection of line voltages up to 240VAC.
Operation and storage temperature is -40°C to +85°C, and relative humidity range is zero to 95% noncondensing. All models meet the requirements of EN61000-6-4 (radiated/conducted emissions) and EN61000-6-2 (ESD/RF/EFT immunity). For operation in hazardous environments, North American Class I, Division 2, and European Group II, Category 3, approvals are pending.
Dataforth Corporation was established in 1984 and is a worldwide leader in the design and manufacture of signal conditioning, data acquisition, and data communications products for industrial and institutional markets. The company is ISO9001:2000 registered and offers a broad range of analog and digital I/O modules, 2-wire transmitters, data acquisition systems, industrial data modems, and modem systems.
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