Dataforth Corp. (Tucson, AZ) introduced the MAQ20® industrial data acquisition and control system that features an analog resistance input module for channel protection. It interfaces to three types of 3-wire sensors: 100Ω Pt, 120Ω Ni RTDs, and potentiometers up to 5kΩ. The module has six input channels, each of which is protected up to 240 Vrms continuous overload in case of inadvertent wiring errors. Overloaded channels do not adversely affect other channels in the module. Transient protection is per the ANSI/IEEE C37.90.1 standard; input-to-bus isolation is 1500Vrms. The system can individually configure channels for sensor, range, alarm limits, and averaging. While all channels are enabled by default, those not used can be disabled to increase the sampling rate of channels enabled for scanning.

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