Page 1 Model 451212 Version 2.3 May 2003
INSTRUCTION MANUAL
Model 451212
Air Velocity MultiMeter Adapter
1. INTRODUCTION
Congratulations on your purchase of Extech’s Air Velocity Multimeter Adaptor. The 451212
connects to the mV input of a multimeter for displaying air velocity (knots, ft/min, km/hr, and
m/sec). This professional device, with proper care, will provide years of reliable service.
2. SPECIFICATIONS
Measurement
Range
Output
Accuracy
0.4 – 30.0 meters/sec
1 mV per 1m/sec
± (2% + 0.1 mV)
1.4 – 108.0 kilometers/hr
1 mV per 1km/hr
± (2% + 0.3 mV)
80 – 5910 ft/min
1 mV per 100ft/min ± (2% + 0.2 mV)
0.8 – 58.3 knots
1 mV per 1 knot
± (2% + 0.2 mV)
Sensor
Twisted vane arm with low friction ball bearing
Sensor cable
55” cable
Power
9V Battery (low battery indicator located on front panel)
Operating
Temperature &
Relative Humidity
Temp: 32 to 122
o
F (0 to 50
o
C); RH: 90% max.
Dimensions
100 x 50 x 25mm (3.9x2.0x1.0”); Sensor: 2.8” (72mm) diameter
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