Dwyer Instruments, Inc., the preferred source for your complete range of practical and affordable instrumentation, is announcing the release of its NEW SERIES VTT HOT-WIRE AIR VELOCITY/TEMPERATURE TRANSMITTER designed for HVAC applications that require both velocity and temperature monitoring. The Series VTT Hot-wire Air Velocity and Temperature Transmitter provides sensing for both air velocity and temperature, simplifying greatly installation time by eliminating the need to supply two separate components. The VTT offers field-selectable velocity and temperature ranges in English (FPM, °F) or metric (m/s, °C) units with maximums up to 6000 FPM (30 m/s) and 212°F (100°C). The units are available with or without an LCD display and are available in either a duct mount or remote probe with cable installations. The VTT is a useful transmitter for many common HVAC applications.


• Service: Clean air and compatible, non-combustible gases. • Accuracy: Air Velocity: ±3% of reading ±60 fpm (±0.3 m/s); Temperature: ±0.5% of reading ±0.6°F (±0.4°C). • Temperature Limits: Ambient: 32 to 122°F (0 to 50°C); Storage: 14 to 158°F (-10 to 70°C). • Power Supply: 24 VAC/VDC (±10%) 3-4 wires. • Current Consumption: 4-20 mA Output: 80 mA maximum; 0-10 V Output: 40 mA. • Response Time: Air Velocity: 2 seconds to 1/e (63%) of final value; Temperature: 5 seconds to 1/e (63%) of final value. • Maximum Loop Resistance: 4-20 mA Output: 500 Ω; 0-10 V Output: 1 kΩ. • Display: 5 digit; Resolution 1 fpm (0.1 m/s) 1.0°F (0.1°C). Alternates between velocity and temperature. • Electrical Connection: Screw terminal block. • Cable Length (Remote Probe): 6.56 ft (2 m). • Enclosure Rating: ABS rated NEMA 4X (IP65). • Mounting: Can be mounted in any orientation. Probe must be aligned with airflow. Mounting accessory included. • Weight: With Display: 0.32 lb (145 g); Without Display: 0.24 lb (110 g). • Agency Approvals: CE.
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