| | | Long distance accuracy Temptran transmitters amplify the low-level signals from RTDs or thermocouples to an industry-standard 4 to 20 mA current signal proportional to temperature. Unlike resistance or voltage, current signals are immune to resistance in extension wires and stray electrical noise. This lets you receive accurate signals from a sensor located thousands of feet away. The 4 to 20 mA output signal and DC power share the same wire pair. You don't need to run power wires to every sensor location. RTD transmitters also linearize the signal to temperature, making them excellent low cost signal conditioners. Their signal increases from 4mA at the lowest temperature to 20mA at the highest temperatures. Engineered for reliability Over 500,000 Minco transmitters are currently giving trouble-free service in installations around the world.Two factors behind Temptran's exceptional stability and longevity are: • Minco encapsulates all electronics in epoxy to exclude contaminants and protect components. • Standard fixed-range transmitters feature ±5% adjustability using 20 turn trimpots. Because a complete rotation of the trim-pot represents only 0.25% of the adjustment range, slight movements from mechanical shock cause only negligible output change. In contrast, many competitive transmitters have wide ranging zero and span. With zero and span far more sensitive to potentiometer shifts, a minor bump can void the transmitter's calibration. | | Easy to install Compact Temptrans fit nearly anywhere. You can install most models in standard electrical utilityboxes and elbows. Or Minco offers a complete selection of complementary connection heads in Section 4. Intrinsic safety Most Temptrans are rated intrinsically safe by Factory Mutual (FM), a recognized testing authority for safety in hazardous areas. Division 1 installations must include a suitable barrier. Go to www.minco.com/barriers/ for a list of barriers FM approved under the system concept for use with Temptrans. Special high-accuracy calibration Standard transmitters can be calibrated to the nominal resistance values of the RTD at the zero and span points. Total system error includes the tolerance of both the transmitter and the RTD sensor. If you order Minco Temptrans calibrated to the actual resistance of the RTD (traceable to NIST), this effectively subtracts the sensor tolerance from system accuracy specifications. For example, consider a transmitter with a range of 0 to 500°C. The transmitter itself is accurate to ±1.0°C (±0.2% of span, including calibration accuracy and linearity). The RTD inter-changeability contributes an additional error of ±0.3°C at 0°C and ±2.8°Cat 500°C. Total system error would be ±1.3°C at0°C and ±3.8°C at 500°C. Calibration of the sensor and transmitter as a set cancels the sensor error, reducing system error to ±1.0°C over the full range — all for a nominal extra cost. Get more information on page 5-18. | | |