Specifications include, but are not limited to: 2.04 DAMPER OPERATORS A. General: Provide smooth proportional control with sufficient power for air velocities 20 percent greater than maximum design velocity and to provide tight seal against maximum system pressures. Provide spring return for two position control and for fail safe operation. 1. Manufacturers: a. Belimo: www.belimo.com. B. Electric Operators: 1. Spring return, adjustable stroke motor having oil immersed gear train, with auxiliary end switch. 2.05 INPUT/OUTPUT SENSORS A. Temperature Sensors: 1. Use thermistor or RTD type temperature sensing elements with characteristics resistant to moisture, vibration, and other conditions consistent with the application without affecting accuracy and life expectancy. 2. Construct RTD of nickel or platinum with base resistance of 1000 ohms at 70 degrees F (26 degrees C). 3. 100 ohm platinum RTD is acceptable if used with project DDC controllers. 4. Temperature Sensing Device: Compatible with project DDC controllers. 5. Performance Characteristics: a. RTD: 1) Room Sensor Accuracy: Plus/minus 0.50 degrees F (0.28 degrees C) minimum. 2) Duct Averaging Accuracy: Plus/minus 0.50 degrees F (0.28 degrees C) minimum. 3) Chilled Water Accuracy: Plus/minus 0.50 degrees F (0.28 degrees C) minimum. b. Thermistor: 1) Accuracy (All): Plus/minus 0.36 degrees F (0.20 degrees C) minimum. 2) Range: Minus 25 degrees F (Minus 13 degrees C) through 122 degrees F (50 degrees C) minimum. 3) Heat Dissipation Constant: 2.7 mW per degree C. c. Temperature Transmitter: 1) Accuracy: 0.10 degree F (0.06 degrees C) minimum or plus/minus 0.20 percent of span. 2) Output: 4 to 20 mA.d. Sensing Range: 1) Provide limited range sensors if required to sense the range expected for a respective point. 2) Use RTD type sensors for extended ranges beyond minus 30 degrees F (minus 34.4 degrees) to 230 degrees F (114.4 degrees C). 3) Use temperature transmitters in conjunction with RTD's when RTD's are incompatible with DDC controller direct temperature input. e. Wire Resistance: 1) Use appropriate wire size to limit temperature offset due to wire resistance to 1.0 degree F (0.56 degrees C) or use temperature transmitter when offset is greater than 1.0 degree F (0.56 degrees C) due to wire resistance.