The Model 657-1 relative humidity and temperature transmitter includes two 2-wire circuits to simultaneously produce separate 4-20 mA output signals for relative humidity from 0-100% and temperature from 32 to 212F. Accuracy for humidity is ±2% from 10-90% and for temperature it is ±1F over the full range. The control operates both channels from a single 10-35V dc power supply wired into the relative-humidity current loop. The probe included with the transmitter features an integrated, polymer film, and a relative-humidity sensor plus a separate thin-film platinum sensor for temperature measurement.
Dwyer Instruments Inc., Box 373, Michigan City, IN 46361, FAX (219) 872-9057.
Some cars are more reliable than others, but even the vehicles at the bottom of this year’s Consumer Reports reliability survey are vastly better than those of 20 years ago in the key areas of powertrain and hardware, experts said this week.
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While many larger companies are still reluctant to rely on wireless networks to transmit important information in industrial settings, there is an increasing acceptance rate of the newer, more robust wireless options that are now available.
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