Why use Temptran Temperature Transmitters?
Long distance accuracy Temptran transmitters amplify the low-level signals from RTD's 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.
Engineered for Reliability
Over 175,000 Minco transmitters are currently giving trouble-free service in installations around the world. Two factors behind Temptrans'T 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 trimpot represents only 0.25% of the span, slight movements from mechanical shock cause only negligible output change. In contrast, many competitive transmitters have wide ranging zero and span. Some even use single-turn potentiometers. With zero and span far more sensitive to potentiometer shifts, a minor bump can void the transmitter's calibration.
Easy to Install
Compact Temptran fit nearly anywhere. You can install most models in standard electrical utility boxes and elbows. Or Minco offers a complete selection of complementary connection heads. DIN rail mounting options are also available for instrument cabinets.
Most Temptrans are rated intrinsically safe by Factory Mutual, a recognized testing authority for safety in hazardous areas. Installations must include a suitable barrier. A list of barriers FM approved under the system concept for use with Temptrans can be found in our FM Documentation. Read Application Aid #19 to learn more about the use of sensors in hazardous areas.
Special High-Accuracy Calibration
Standard transmitters are 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 interchangeability contributes an additional error of ±0.3°C at 0°C and ±2.8°C at 500°C. Total system error would be ±1.3°C at 0°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.
NIST Traceability at No Cost
With each matched sensor/transmitter set, Minco sends you calibration data traceable to the National Institute of Standards & Technology. This helps your process comply with ISO 9000 and other quality standards.
Minco prints RTD resistance values right on the Temptran label to simplify recalibration. You simply connect a resistance decade box or "RTD simulator" in place of the RTD, dial in the correct values, and adjust zero and span. Because Minco platinum RTD's are extremely stable in typical installations (0.1°C or better), you can trust the printed values for many years without recalibration of the sensor.
All Minco HVAC RTD's are available with companion 4 to 20 mA transmitters.