ONO SOKKI - AR-7240 Analog Engine tachometer

Replaced by AR-7240B Analog Engine Tachometer

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Analog Engine Tachometer

Analog Engine Tachometer
AR-7240 (Auto Range Type)

Outer Dimensions (PDF)

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

	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		VP-201/202 Magneto Vibration Detector Detecting vibrations caused by the reciprocating up-and-down movement of an engine's piston

	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.		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.

	OM-200 Electro-Magnetic Detector Detecting the leakage flux from the magneto rotating shaft of an engine.		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.