Murphy Automobile Parts MT90 User Manual

MT-9004B  
Revised 03-06  
Digital Tachometer by Murphy  
Catalog Section 20  
(00-02-0068)  
®
SELECTRONIC  
MT90 Model  
1 RPM Accuracy  
Easy Calibration  
Clear-Read LCD Display  
Back Light for Night Viewing  
(Battery Powered models)  
Input Source Can Be a Magnetic Pickup  
or Engine Alternator  
Power Supplied by Magnetic Pickup  
or 12, 24, or 32 VDC Battery System  
Dimensions  
Description  
Specifications  
®
Calibration  
Back View  
The Murphy SELECTRONIC MT90 is a digital  
tachometer. Its high accuracy and dependability  
result from use of a quartz crystal time based and  
digital, solid-state electronics.  
Signal Input Voltage: 4 to 35 Vrms from a mag-  
Rotary Switches  
(located under  
removable  
netic pickup or alternator**.  
Pulses per Revolution: 3 to 999.  
rubber seal)  
0
0
0
5
5
5
X
1000  
X
100  
X
10  
Mounting  
Clamp  
Power Requirements:  
Pickup Power: 4-35Vrms**.  
Tachometer power is supplied by either a Murphy  
magnetic pickup, mounted at the flywheel ring-  
gear of an engine, or by a 12, 24 or 32 volt DC  
battery system.  
RPM data is supplied by either a Murphy magnet-  
ic pickup or by the alternator in your battery  
charging circuit. The MT90 also has back-lighting  
for easy readings in low lit areas; this lighting  
requires a battery power source.  
Battery Power: 8-40 VDC (12, 24, 32 volt).  
Current:  
Tach back-light Off, 4mA @ 40 VDC.  
Tach back-light On, 25 mA @ 40 VDC.  
Terminal  
Screws  
Case: 1018 polycarbonate/polyester blend.  
Lens: Polycarbonate.  
Bezel: #430 Stainless Steel.  
3-5/8 in  
(92 mm)  
Side View  
Display: LCD, 4-digit, seven segment.  
RPM Calibration  
Operating Temperature: -4 to 158°F  
The MT90 is calibrated to engine RPM by setting a  
series of calibration rotary switches on the back of  
the tachometer. The proper switch sequence for the  
engine is determined by (1) the number of ring gear  
teeth for the magnetic pickup, or (2) by the ratio of  
alternator to engine pulley diameter, and the num-  
ber of poles of the alternator.  
(-20 to 70°C).  
Storage Temperature: -13 to 185°F (-25 to 85°C).  
Mounting Hole: 3-7/16 in. (87 mm).  
Shipping Weight: 14 oz. (0.4 kg).  
Shipping Dimensions: 5-1/2 x 5-1/2 x 5-1/2 in.  
3-1/8 in  
(80 mm)  
(140 x 140 x 140 mm)  
*
Products covered by this bulletin comply with  
Applications  
Warranty  
EMC Council directive 89/336/EEC regarding  
Typical applications include: Generators,  
Compressors, Industrial Engines, Oil Field  
Equipment, Marine Vessels, Vehicles, Farm  
Equipment, and Construction Equipment.  
A limited warranty on materials and workmanship is  
given with this FW Murphy product. A copy of the  
warranty may be viewed or printed by going to  
electro-magnetic compatibility except as noted.  
**  
See “Special Note” for Magnetic Pickup  
Powered MT90 applications (back page).  
MT-9004B page 1 of 2  
 

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