Murphy DT9800 User Manual

DT-8603B

®

FRANK W.

MFR.

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 depend­able due to digital solid-state electronics and
a quartz crystal time base. The surface­mount enclosure makes it easy to install.
Tachometer power and RPM data are sup­plied by a magnetic pickup or capacitor dis­charge (CD) ignition–depending on model
chosen. The RPM data is converted and dis­played on a four digit, easy-to-read liquid
crystal display (LCD). The LCD displays up
to 9999 RPM.

The DT9803 and DT9804 are tachometer­only 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

•

Industrial Engines

•

Generator Sets

•

Compressors

•

Oil Field Equipment

•

Marine

Calibrating and Setting
Overspeed Switches

The DT9800 series is calibrated to your
engine by setting a series of calibration “rock­er” 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 mod­els only. The overspeed switches and cali­bration rocker switches are accessed from
the back of the tachometer.

•

Vehicles

•

Farm Equipment

•

Construction

Equipment

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)

*

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.

Magnetic Pickup

5-1/16 in.
(129 mm)

4-1/4 in.

(108 mm)

1-9/32 in.

(33 mm)

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123456789101112

OPEN

4 in.

(102 mm)

2 in.

(51 mm)

3-1/2 in.
(89 mm)

2 in.

(51 mm)

3/16 in (5 mm)

diameter, 4 places

3-1/8 in.
(79 mm)

diameter

®

FRANK W.

MFR.

Murphy offers magnetic pickups
sold separately.

Pickup Total Threaded Thread

†

Models

MP3298 3 (76) 3 (76)
MP7906 3 (76) 3 (76)
MP7905 4-1/2 (114) 4-1/2 (114)

†

Magnetic pickups have lead wire hookups.

††

Lengths are in inches and (millimeters).

Length††Length††Size

5

/8

3

/4-

3

/4-

-18 UNF
16 UNF
16 UNF

Dimensions

How to Order

When ordering DT9800 series tachome­ters specify model number and options
(if apply).

DT9805 - __

Models

DT9803
DT9804
DT9805
DT9806

Options

EX = Explosion-proof

Warranty

A two-year limited warranty on materials
and workmanship is given with this
Murphy product. Details are available on
request and are packed with each unit.

Calibration rocker switches

Back of
DT9800
Series

Mounting Hole

Overspeed switch (DT9805 and DT9806 only).
Switch shown set at 1850 RPM.

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.

■ Frank W. Murphy Manufacturer

P.O. Box 470248; Tulsa, Oklahoma 74147; USA

tel. [phone] fax [phone]
e-mail [e-mail]

■ Frank W. Murphy Southern Division

P.O. Box 1819; Rosenberg, Texas 77471; USA

tel. [phone] fax [phone]
e-mail [e-mail]

Printed in U.S.A.

Since 1939

■ Frank W. Murphy, Ltd.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.

tel. [phone] fax [phone] tlx 477088
e-mail [e-mail]

■ Frank W. Murphy Pte., Ltd.

No. 2 Tuas South Street 2, Sprintecs Bldg., #02-01/02
Singapore 638042

tel. [phone] fax [phone]
e-mail [e-mail]

■ Murphek Pty., Ltd.

1620 Hume Highway; Campbellfield, Vic 3061; Australia

tel. [phone] fax [phone]
e-mail [e-mail]

■ Murphy de México, S.A. de C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384

tel. [phone] fax [phone]
e-mail [e-mail]

■ Murphy Switch of California

P.O. Box 900788; Palmdale, California 93590; USA

tel. [phone] fax [phone]
e-mail [e-mail]

■ Frank W. Murphy France

tel. [phone] fax [phone]

046490