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Dataforth has introduced the 8B33 Sensorlex isolated analogue-signal conditioner, for measuring true root mean square (RMS) values of input signals.

The conversion core circuit used in the 8B33 is similar to those found in high-end digital voltmeters.

The 8B33 is fully encapsulated, protecting it against harsh environmental conditions.

The Sensorlex 8B measures 28.1 x 41.9 x 10.2mm.

The product line now includes 19 family groups with a total of 123 different models.

The 8B’s small size is ideal for embedded or portable applications such as mobile test stands, COTS military and defence applications, miniaturised security and surveillance systems, embedded process controls for semiconductor manufacturing equipment and most other embedded industrial data-acquisition systems.

All 8B modules interface to a variety of voltage, current, temperature, position, frequency and strain measuring devices.

Their potted thermoplastic plug-in-the-panel packaging provides excellent impact properties, dimensional stability over temperature, chemical resistance and a flammability rating of UL-94 V-0.

The line is also available in a DIN-mount configuration.

The Sensorlex 8B family includes: voltage and current input modules; linearized two-, three- and four-wire RTD modules; potentiometer, strain gage and both linearized and non-linearized thermocouple input modules; current and voltage output modules with 100Hz bandwidth; voltage input modules with 1kHz and 20kHz bandwidths; frequency input modules; and two-wire transmitter interface modules.

Except for those models specified, signal bandwidth is 3Hz for most 8B modules.

The 8B can interface to analogue signals such as millivolt, volt, milliamp, thermocouple, RTD, potentiometer, slidewire, strain gage, frequency and two-wire transmitter.

Analogue output modules provide a wide selection of current and voltage output ranges.

Voltage input conditioners accept signals from +/-10mV to +/-60V.

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 two-, three- and four-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 two-wire transmitter module provides loop power and accepts a 4-20mA input signal.

Additional models offer isolated field-side current and voltage outputs.

Current output ranges are 0-20 and 4-20 milliamp, while voltage output ranges are 0 to 10V and +/-10V.

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 per cent span.

Cold junction compensation error for thermocouple inputs is +/-0.5C at 25C ambient.

Design-in 8B accessories include a selection of standard and DIN backpanels (one, two, four, eight and 16 channels) that provide screw-terminal inputs and outputs, as well as a DB25 header connector.

The DB25 cables are available in one, two or seven-metre lengths.

Moreover, a power supply module in the same 8B form-factor is offered to accommodate input voltages of 7-34V DC and provide 5V DC output at 2A to power any combination of 8B signal conditioners.

The 8BPWR-2 module plugs into its own socket on the backpanel.

A DIN-rail mounting accessory, the 8BP01, is offered as a 5V DC powered or 7-34V DC powered DIN-rail mount carrier suitable for any 8B module.

The 8B carrier can be mounted on any standard DIN rail (EN 50022-35 and EN 50035-G32).

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 three-pole filter, normal-mode rejection is 70dB at 60Hz.

Operation and storage temperature is -40C to +85C and relative humidity range is zero to 95 per cent non-condensing.

All models are CE-compliant and meet the requirements of EN61000-6-4 (radiated/conducted emissions) and EN61000-6-2 (ESD/RF/EFT immunity).

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