DT-8603B
Revised 03-97
Catalog Section 20
(00-02-0066)
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
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.
The DT9803 and DT9804 are tachometer-
only models. The DT9803 is powered by a
magnetic pickup. The DT9804 is powered
by a CD ignition.
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.
Applications
Calibrating and Setting
Overspeed Switches
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.
Overspeed switches are set by adjusting rotary
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.
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.
Temperature Range
-4 to 158°F (-20 to 70°C).
Case Dimensions: see reverse side.
Accuracy: ±1 RPM.
Frequency Range:
DT9803 and DT9805: 1 to 15 KHz.
DT9804 and DT9806: 3 to 666 Hz.
Overspeed Switch (DT9805 and DT9806):
S.C.R. output. Rated 5 A @ 400 VDC.
Shipping Weights (all models): 1lb (.5 kg)
Shipping Dimensions (all models)
9-1/4 x 8-1/4 x 5-1/4 in.
(235 x 210 x 133 mm)
®
• Industrial Engines
• Generator Sets
• Compressors
• Oil Field Equipment
• Marine
• Vehicles
• Farm Equipment
• Construction
Equipment
*
*
*
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.
®
FRANK W.
MFR.
