Direct acting Pneu. Velocity Cntrllr,"C". Overview An ultra-sensitive air velocity sensor and pneumatic controller, control pneumatic damper actuators in heating and air conditioning systems to provide constant air velocity in the duct regardless of the static pressure. Features State-of-the-art design provides reliable operation. Not position sensitive. Direct Acting (DA) and Reverse Acting (RA) models are available. Insensitive to static pressure changes. Accurate control throughout entire velocity range. Graduated scales for minimum and maximum velocity adjustments. Velocity reset by thermostat demand. Adaptable to many terminal unit control strategies. Product Specifications Application Velocitrol Air Velocity Sensor Airflow Usage 0.029 scfm (13.7 mL/s), includes supply for bleed type thermostats for type B, does not include thermostat air for type C controller Dimensions (in.) Controller: 1 3/4 in. high x 3 1/4 in. wide x 2 3/8 in. deep / Sensor: 3 3/16 in. high x 1 3/4 in. wide x 4 3/16 in. long with orifice and 3 3/8 in. long without orifice Dimensions (mm) Controller: 44 mm high x 83 mm wide x 60 mm deep / Sensor: 81 mm high x 45 mm wide x 107 mm long with orifice and 86 mm long without orifice. Maximum Safe Operating Pressure (psi) 30 psi Maximum Safe Operating Pressure (kPa) 207 kPa Temperature Range (F) 40 F to 130 F Temperature Range (C) 5 C to 55 C Comments For normally open damper and two-pipe thermostat Mounting N/S Approvals, Underwriters Laboratories Inc. N/S Approvals, Canadian Standards Association N/S Operating Humidity Range (% RH) 5 to 95% RH Approvals, Factory Mutual N/S Sensor Element Remote Sensor Connection Size (in.) N/S Differential Pressure Range (psi) N/S Differential Pressure Range (kPa) N/S Approvals, NEMA Standard N/S Pressure Ratings (psi) Reset-- 9 to 15 psi Pressure Ratings (kPa) Reset-- 62 to 103 kPa Number of Pipes N/S Changeover Pressure (psi) N/S Changeover Pressure (kPa) N/S Mainline Pressure Range (psi) 18 psi Minimum, 20 psi Nominal Mainline Pressure Range (kPa) 124 kPa Minimum, 138 kPa Nominal Capacity N/S Control Range (fpm) 500 fpm up to 3500 fpm by changing orifice Control Range (m/s) 2.5 m/s up to 17.8 m/s by changing orifice Number of Sensor Inputs N/S Remote Control Point Adjustment N/S Approximate Throttling Range, Midscale (psi) N/S Approximate Throttling Range, Midscale (kPa) N/S