461950 Datasheet, PDF (4/6 Pages) Extech Instruments Corporation. – Panel Mount Digital Tachometer

Wiring Instructions
The Model 461950 has seven screw terminals for AC power, sensor input, and sensor
excitation.
Model 461955 Proximity Switch Wiring
1. Brown wire (10 - 30V supply signal) to terminal 3 on the panel tachometer (+12V)
2. Black wire to terminal 2
3. Blue wire to terminal 1
Model 461957 Photoelectric Sensor Wiring
1. Brown wire connects to terminal 3 of the panel tachometer
2. Blue wire connects to terminal 1
3. Black wire (sensor output during high to low transition) or Green wire (sensor output
during low to high transition) connects to terminal 2. Connect one wire only to terminal
2 (black or green) depending upon which better suits the application.
AC Power Wiring
Meter terminals 5, 6, and 7, are for AC power connections. Connect to terminals 5 and 7
for 220V applications. Connect to terminals 6 and 7 for 110V power applications. A
Wiring Diagram
SENSOR INPUT
POWER INPUT
GND POS +12V N.C. 220V 110V Neutral
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NOTE: Fusing and electrical noise preventative devices such as MOVS, RC networks, and
line filters should be considered by the user when installing to avoid electrical noise
interference.
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Model 461950 Version 2.0 March 2005