Murphy Automobile Parts TAH 97026B User Manual

TAH-97026B  
Revised 05-05  
Catalog Section 20  
(00-02-0260)  
Tachometers and Tach/Hourmeters  
AT and ATH Series  
3000 and 4000 RPM –0 to 100,000 hours  
Sensing from Magnetic Sensor, Battery  
Charging Alternator or Ignition Signal  
High Visibility Analog Readout  
Air Core Movement  
Easy Calibration  
Through Dial Lighting  
**  
Powered by 12 VDC Battery  
Available Converter for 24 to 12 VDC  
Description  
Series Models  
Applications  
ATS Series Magnetic Sensor Signal Tach  
The AT Series tachometers are rugged, transis-  
torized instruments with solid-state circuitry for  
indication of engine RPM. They are equipped  
with a bracket for mounting into a standard 3-  
3/8 in. (86 mm) dash mounting hole. A full 270°  
sweep of the pointer gives an accurate indication  
on a large easy–to–read scale and the dial can be  
illuminated for night reading. The ATH Series  
models are also equipped with hourmeter to  
record the elapsed running time of an engine.  
These tachometers are specially designed for use  
on truck, marine, industrial, or stationary engines.  
*
70 - 225 pulses 12 VDC, 2733 Hz to 13.62 kHz  
@ 3000 RPM  
Specifications  
ATHS Series Magnetic Sensor Signal  
Tachometer/Hourmeter  
Power Input: 12 VDC (11.5 to 16 V)  
[0.84 to 1.44W].  
*
70-225 pulses 12 VDC, 2733 Hz to 13.62 kHz @  
Back Light: 3 to 4.7 W.  
3000 RPM  
RPM Input Signal Voltage: 1.5 Vrms min. from a  
ATA Series Alternator Signal Tachometer  
magnetic pickup or alternator (minimum 3-pole).  
*
3-27 pulses 12 VDC, 137 to 1330 Hz @ 3000 RPM  
Accuracy: Tachometer: 2% full scale.  
ATHA Series Alternator Signal  
Tachometer/Hourmeter  
Hourmeter: 0.01% hours, 1 count.  
Models available for Alternator, Magnetic  
Sensor or Ignition signal  
Temperature Range: -5 to 185°F (-20 to +85°C).  
Dial: 270° sweep (white numerals over black)  
Bezel: 304 Stainless Steel.  
*
3-27 pulses 12 VDC, 137 to 1330 Hz @ 3000 RPM  
These instruments are designed to function from  
pulses generated by an alternator with 4, 8, 12,  
14, or 16 poles on the rotor. The pulses can also  
be obtained from the ring gear of an engine by  
means of an electromagnetic sensor (magnetic  
pickup). Murphy’s magnetic sensor driven mod-  
els are designed to function with flywheels hav-  
ing anywhere from 70 to 225 teeth.  
or 193 to 1815 Hz @ 4000 RPM  
ATHI Series Ignition Signal  
Tachometer/Hourmeter  
Scales: 0 - 3000 RPM or 0 - 4000 RPM.  
Case Material: Plastic.  
4, 6 or 8 cylinder engines @ 4000 RPM  
Hourmeter Range: Measures elapsed time:  
100,000 hours in 0.1 increments (tenths).  
Shipping Weight: 0.89 lb. (403 g).  
Bezel Styles  
Shipping Dimensions: 5-1/2 x 5-1/2 x 5-1/2 in.  
Ignition signal model available for 4, 6 or 8  
cylinder, spark-ignated engines.  
(140 x 140 x 140 mm).  
All models are for negative ground, positive  
ground or isolated electrical systems and are  
protected against reverse polarity hookup.  
*
To determine pulses per engine revolution, work the  
formulas on the back page and use the pulses per revolu-  
tion number to determine if the tachometer can be used  
for your application.  
black stainless  
black SAE  
bright stainless  
bright SAE  
All models are powered by 12 VDC and are  
reverse polarity protected.  
** PCrooudnuccitlsdciroevcetirveed 8b9y/3th3i6s/EbuElCletriengcaordminpglyewleictthroEmMagCnetic  
compatibility except as noted.  
Range available only for ATHA-40-12-A; ATHI-40-12-A  
TAH-97026B page 1 of 2  
 

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