TAH-97026B
Revised 05-05
Catalog Section 20
(00-02-0260)
Tachometers and Tach/Hourmeters
AT and ATH Series
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3000 and 4000 RPM –0 to 100,000 hours
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Sensing from Magnetic Sensor, Battery
Charging Alternator or Ignition Signal
High Visibility Analog Readout
Air Core Movement
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■
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Easy Calibration
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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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