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DT-8605N
Revised 07-97
Section 20
(00-02-0180)
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 surface-mount 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 tachometer-only models. The DT9803 is
powered by a magnetic pickup. The DT9804 is powered by a CD ignition.
The TACHSWICH™ models, 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.
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).
Accuracy: ±1 RPM.
Frequency Range:
DT9803 and DT9805: 1 to 15 KHz.
DT9804 and DT9806: 3 to 666 Hz.
Overspeed Switch Rating (DT9805 and DT9806 only):
SCR output. 5 A @ 400 VDC.
SELECTRONIC
®
Digital Tachometer/TACHSWICH™
Installation Instructions
DT9800 Series
Please read the following information before installing. A visual inspection of this product for damage during shipping is
recommended before mounting. It is your responsibility to have a qualified person install this unit and make sure installation
conforms to NEC and local codes.
GENERAL INFORMATION
®
WARNING
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT
✔ Disconnect all electrical power to the machine.
✔ Make sure the machine cannot operate during installation.
✔ Follow all safety warnings of the machine manufacturer.
✔ Read and follow all installation instructions.
*
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.
®
Class I,
Division 2,
Group D
MOUNTING
1. Before installing, b
e sure there will be enough clearance to access the
calibration rocker switches and overspeed switches from the back of
the panel.
2. Drill mounting holes according to the dimensions below.
3. Be sure the gasket is in place on the back of the tachometer before
installing. Insert the tachometer from the front of the panel aligning the
mounting studs with the appropriate holes. Secure the tachometer using the
four 6/32 nuts, but do not overtighten the nuts as case damage could occur.
1
Gasket
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Calibration Rocker
Switches
Overspeed
Switches**
Wiring
Terminals
**Applies to overspeed models only.
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
Tachometer
Panel
Back View
*
*
Mounting Hole Dimensions