T77430-41

Airpax T77430-41 Tachometer | With Input 115 Vac ±10%, 50-60 Hz | 24 VDC (23-30 VDC), standard (750 ohm analog load) | 20-30 VDC with 600 ohm analog load, 10 watts maximum.

TACH-PAK 3 is a single-input industrial tachometer that measures the rate of events. Using  various sensors, TACH-PAK 3 can measure events as simple as the speed of a rotating shaft, the rate at which paper passes through a press, or as diverse as the rate at which liquid flows  through a pump.

A speed sensor placed near a target, such as a rotating gear, generates a repeating electrical 

 pulse. The rate of repetition is proportional to the rate of the event you want to measure

 and represents the input frequency. TACH-PAK 3 measures this rate in number of pulses per

 second (hertz). This input signal from the sensor is conditioned, analyzed by a microcom

puter and routed to the outputs.

 TACH-PAK 3’s microcomputer uses a scheme of data acquisition called adaptive period

 averaging, a unique frequency measuring method in which the number of periods averaged

 changes with the frequency to obtain optimal accuracy. At input frequencies of 100 Hz and

 above, the outputs are updated every 30 milliseconds.

 TACH-PAK 3 provides three scaleable output types:

 • 0-1 mA DC meter output

 • 0-20/4-20 mA DC analog output

 • Four Form C (SPDT) relay setpoints

 To set up TACH-PAK 3,  first determine how each output should behave in your application,

 then enter the setup information as thirteen “constants” through TACH-PAK 3’s internal

 control panel. (See Section 4.) The constants are stored in TACH-PAK 3’s    electrically

 alterable read-only memory (EAROM). They can be viewed and altered individually in much

 the same way you set a digital watch