Murphy Selectronic Dt9800 User Manual

®
DT-8603B  
Revised 03-97  
Catalog Section 20  
(00-02-0066)  
FRANK W.  
MFR.  
SELECTRONIC® Tachometer/TACHSWICH™  
DT9800 Series  
Read RPM Data from Magnetic Pickup  
or CD ignition  
No External Power Required  
Accurate to ±1 RPM  
Easy-to-Read LCD Display  
Choose Tachometer Only Or a  
Tachometer With Overspeed Switch  
*
®
*
Description  
Applications  
Specifications  
Input Signal Source  
DT9803: 18 to 112 volts peak to peak or  
3.5 to 40 Vrms.  
DT9805: 18 to 112 volts peak to peak or  
7 to 40 Vrms.  
DT9804 and DT9806: 90 to 400 VDC,  
CD ignition.  
The Digital SELECTRONIC® DT9800 series  
features a tachometer-only and tachometer  
with built-in overspeed switch. These  
tachometers are highly accurate and depend-  
able due to digital solid-state electronics and  
a quartz crystal time base. The surface-  
mount enclosure makes it easy to install.  
Tachometer power and RPM data are sup-  
plied by a magnetic pickup or capacitor dis-  
charge (CD) ignition–depending on model  
chosen. The RPM data is converted and dis-  
played on a four digit, easy-to-read liquid  
crystal display (LCD). The LCD displays up  
to 9999 RPM.  
Industrial Engines  
Generator Sets  
Compressors  
Oil Field Equipment  
Marine  
Vehicles  
Farm Equipment  
Construction  
Equipment  
Calibrating and Setting  
Overspeed Switches  
Temperature Range  
-4 to 158°F (-20 to 70°C).  
The DT9800 series is calibrated to your  
engine by setting a series of calibration “rock-  
er” switches. The switch setting is determined  
by the number of ring gear teeth and proper  
selection of the calibration code–located in the  
DT9800 series installation instructions.  
Case Dimensions: see reverse side.  
Accuracy: ±1 RPM.  
Frequency Range:  
DT9803 and DT9805: 1 to 15 KHz.  
DT9804 and DT9806: 3 to 666 Hz.  
The DT9803 and DT9804 are tachometer-  
only models. The DT9803 is powered by a  
magnetic pickup. The DT9804 is powered  
by a CD ignition.  
Overspeed switches are set by adjusting rotary Overspeed Switch (DT9805 and DT9806):  
dials to the appropriate RPM number.  
Overspeed can be set from 0010 to 9990  
RPM within ± 5 RPM. Overspeed switches  
are available on DT9805 and DT9806 mod-  
els only. The overspeed switches and cali-  
bration rocker switches are accessed from  
the back of the tachometer.  
S.C.R. output. Rated 5 A @ 400 VDC.  
Shipping Weights (all models): 1lb (.5 kg)  
The DT9805 and DT9806, combine a digital  
tachometer and overspeed switch. The  
DT9805 is powered by a magnetic pickup  
and the DT9806 is powered by a CD ignition.  
Shipping Dimensions (all models)  
9-1/4 x 8-1/4 x 5-1/4 in.  
(235 x 210 x 133 mm)  
*
Class I, Div. 2, Group D Hazardous Locations. Models DT9803  
and DT9805 magnetic pickup powered 18 to 112 Vpp input.  
Models DT9804 and DT9806 used with CD ignition. Contact  
Murphy for details.  
The equipment must be installed in a suitable enclosure accepted  
by local authorities.  

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