This product is discontinued / Replaced by AR-7240B Analog Engine Tachometer (Click here)
  Ono Sokki Co., Ltd.

DISCONTINUED
Replaced by AR-7240B Analog Engine Tachometer

HOME > Products Information > Automotive Solution > Analog Engine Tachometer
Analog Engine Tachometer
AR-7240  (Auto Range Type)
 

 Photo (AR-7240 Analog Engine Tachometer)

The AR-7240 Auto Range Tachometer, featuring a 110mm analog meter, enables to be combined with a plenty of revolution detectors.
Furthermore, measurement range on the analog meter can be changed to the upper range, 10,000 r/min automatically when measured value exceeds the lower range 2,000 r/min. And, two of preset setup of r/min are available for data comparison and alarm function.

 

Features

  • A variety of engine revolution detector can be available in combination, for 2/4-cycle engines having from 1 to 8 cylinders.

  • Number of input pulses per revolution can be set in the range from 0.5 to 199.5 P/R in 0.5 P/R step

  • Three type of outputs; analog, pulse and contact

  • 2 way of power operation ; AC (ranging 100 to 240VAC) and 12VDC (ranging 11to 15VDC, option)

  • 2 of preset setup for "Run Judge" and "Overrun"

 

Specifications Summary

Input Section Applicable Detector (option) Ignition pulse detectors (IP-292/IP-296/IP-3000)
Magnetic Detectors (OM-200/MP-910/MP-981)
Magneto vibration detector (VP-201/202)
Opto-fiber sensor (LG-916/930)
Measuring Range 400 to 10,000 r/min (depending on a detector)
Input Pulse Switching 0.5 to 199.5 P/R (in 0.5 P/R steps, depending on a detector)
Trigger Level IP-292/296/3000
OM-200
VP-201/202
Settable using a dial-type potentiometer
Others Internally adjusted and fixed
Display Section Type 110mm wide angle meter
Measurement Range 0 to 2,000 r/min (20 r/min per a scale) in red-color scaling
0 to 10,000 r/min (100 r/min per a scale) in black-color scaling
Alarm Section Setting By thum-wheel switches
Range Overrun : 1 to 99 x 100 r/min
Running Detection : 1 to 99 x 100 r/min
Comparison Interval Every 100ms
Output Transfer contact
Capacity : non-inductive load
AC240V 2A, DC30V 2A
Analog Output Voltage Output 0 to 5V/0 to 10,000 r/min.
load resistance : 1 Ω min.
Linearity ±0.5% / full-scale max.
Output Adjustment Range ±4% / full-scale max. (zero)
±4% / full-scale max. (span)
Response Time 80ms / 10% to 90% level
Pulse Output Format 1 P/R 60 P/R (un-synced to the input signal)
and wave-shaped output of the input signal
TTL level, fanout : 2
Power Requirement 100 to 240VAC ±10%, approx. 25W
11 to 15VDC, approx. 25W (option)
Operating Temperature Range 0 to +40°C
Weight Approx. 4kg

 

Applicable Detectors

Photo (IP-292/296 Ignition Pulse Detector)

IP-292/296 Ignition Pulse Detector

By clamping it around the ignition coil cable, it can detect the spark signal of ignition systems.

IP-292 : for primary side detection
IP-296 : for high-voltage detection

Photo (VP-201 Magneto Vibration Detector)

VP-201/202 Magneto Vibration Detector

Detecting vibrations caused by the reciprocating up-and-down movement of an engine's piston

       

Photo (IP-3000 Ignition Pulse Detector)

IP-3000 Ignition Pulse Detector

Used by clamping it around the ignition coil cable or the current cable of electronic distributor, detecting the spark signal of ignition systems.
Much compact and light weight than IP-292 / IP-296.

Photo (MP-910 & MP-981 Detectors)

MP-910 Magnetic Detector
MP-981 Electro-Magneto-electric rotation detector

Detecting generated signal, which is having a frequency proportional to revolution.
Located close to a detection gear mounted on a rotating shaft.

       

 Photo (OM-200 Electro-magneteic Detector)

OM-200 Electro-Magnetic Detector

Detecting the leakage flux from the magneto rotating shaft of an engine.

Photo (LG-916 & LG-930 Opto-fiber Sensors)

LG-916/930  Opto-fiber Sensor

Detecting reflecting light from a reflection mark attached on a rotating part of an engine.
Those sensors include the light source, the light receiver and the amplifier in one body.
 

 

Contact Us Questions and Inquireies (Feedback form) Back to previous page