ONO SOKKI - Diesel Engine Tachometer GE-2500

Photo (Diesel Engine Tachometer GE-2500)

The GE-2500 diesel engine tachometer uses rotation speed of an alternator to measure engine rotation speed. With FFT calculation, this tachometer achieves reliable and stable measurement for both diesel and gasoline engines.

The OM-1500 is a compact type detector designed for measuring rotation speed of an alternator. It detects magnetic flux leakage from an alternator. It is used to combine with the GE-2500. (The OM-1200 can also be used with the GE-2500.)

(*It may not be measured or may be changed the measurement range depending on the engine and motor type. For more details, please contact your nearest distributor or send us an e-mail, overseas@ONO SOKKI.co.jp)

Features

Rotation of both gasoline and diesel engines can be measured.

By using rotation speed of an alternator, the rotation speed of the engine can be measured regardless of engine types and number of cylinders.

Auto calibration function is provided. The rotation speed ratio of the alternator and engine is calibrated automatically.

The rotation speed ratio between the alternator and engine is required to calculate the engine rotation speed. Calibration must be executed before measurement to find the rotation speed ratio.

Easy setup.
The sensor can be set any place of an alternator.

Possible to measure while driving

Enables small signal detection by FFT calculation

High noise tolerance and stable measurement

The GE-2500 can find solutions for engine rotation measurement

Comparison of the GE-2500 and the previous model (6-cylinder engine)

The GE-2500 enables stable measurement in entire range even when the engine rotation speed is increased.

Measurement method

Attach the sensor (OM-1500 or OM-1200) to an alternator

1. Attach the sensor (OM-1500 or OM-1200) perpendicular to the alternator’s rotating shaft.
2. Connect the sensor to 「MAIN」 in the rear panel of the GE GE-2500.

Execute the calibration to find the rotation speed ratio between the alternator and engine. Set the rotation speed ratio at the GE-2500.

Select the setting method from the followings
●Setting up using a sensor for calibration
●Setting up manually (select one from three methods.)

【Attention】 Please idle the engine during calibration.

Setup using a sensor for calibration

Measure the rotation speed of the engine and alternator at the same time, and calculate the rotation speed ratio between them automatically.

Setup manually
(select one from three methods.)

• Input the pulley ratio, number of alternator's poles

• Input the rotation ratio (rotation speed ration of the alternator and engine)

• Input engine rotation speed at idling

Remove the sensor for calibration and start measurement by the sensor for measurement (OM-1500 or OM-1200)

The rotation speed ratio calibrated is stored to the GE-2500 main unit automatically. (up to five conditions)。

System configuration and connection example

Overview specification

Measurement section

Measurement object

Diesel engine, gasoline engine with an alternator

Calculation method

FFT calculation

Input frequency range

1 kHz, 2 kHz, 5 kHz (Measurement mode: MAIN) / 500 Hz(Calibration mode: REF)

Measurement accuracy

±2 × rotation speed resolution (r/min)± 1 count

Rotation speed resolution

Frequency range(Hz) ÷ 12800 × 60 ÷ rotation ratio

Display section

Display

Fluorescent display tube

Display update cycle

Selectable from 0.2, 0.5, 1 or 2 (second)

Display resolution

1 r/min, 1 Hz

Measurement display range

20,000 r/min

Input section

Input section

2-ch MAIN(for measurement) REF(for calibration)

Input voltage range

±5 V, ±0.5 V, ±0.05 V

Input connector

BNC

Input coupling

AC coupling

Constant drive power supply

2.2 to 3.2 mA(REF only)

Analog output section

【 REVO 】

Output information	Outputs for rotation speed display values.
Voltage range	0 to F.S. / 0 to 10 V(Value of F.S can be specified. )
Conversion method	12 bit D/A conversion method
Linearity	±0.3 % / F.S.
Output update cycle	200 ms or less
Load resistance	100 kΩ or more
Output connector	BNC

【 SIG 】

Output information	Output of sensor signal connected to MAIN (can be used by switching from analog output)
Load resistance	100 kΩ or more
Output connector	BNC

Pulse output section

Output information

Outputs frequency of display rotation speed.
[when at 6,000 r/min, 100 Hz Duty1:1]

Output voltage

Lo:0.5 V or less, Hi:4.5 V or more(at no load)

Output update cycle

200 ms or less

Load resistance

100 kΩ or more

Output connector

BNC

General specification

Power supply

DC 12 to 24 V

Power consumption

8 VA or less

Operating temperature range

0 to +40 °C

Operating humidity range

+20 to +80 % RH (with no condensation)

Storage temperature range

-10 to +55 °C

Storage humidity range

+20 to +80 % RH (with no condensation)

Outer dimensions

Approx. 144(D)× 72(H)× 180(D)mm
(not including protruded section)

Weight

2 kg or less

Standard

CE marking, RoHs

Accessories

Instruction manual x 3 kinds, rubber support pad x 4, GE-0102 power cable for cigarette lighter plug (1.5 m) x 1

Option

GE-0102 power cable for cigarette lighter plug (1.5 m)
(The GE-0102 is supplied as standard accessory of the GE-2500.)

It may not be measured depending on the engine and motor type. For more details, please contact your nearest distributor or send us an e-mail: overseas@ONO SOKKI.co.jp)
To use the GE-2500, the alternator and engine must be running in synch with each other. The measurement error may become large when the special kind of alternator is used or the belt between the alternator and engine is loose.
It can not be measured or a measurement error may become large depending on the structure of an alternator.

Related products

• Sensor for measurement:OM-1500 or OM-1200 (Detector for rotation speed of an alternator) ···The sensor used when detecting magnetic flux leakage from the alternator.

Motor/gasoline engine
RPM detector
OM-1200

*The cable is sold separately.
(MX-005, MX-010 etc.)

Motor/ engine
RPM detector
OM-1500

	OM-1200	OM-1500
Detection method	Electromagnetic induction
Cable length	(Sold separately)	4.9 m
Operating temperature range	0 to +80 °C	-10 to +100 °C
Weight	Approx. 65 g	Approx. 130 g (including a cable)
Outer dimensions	φ16×54 mm (sensor only) φ16×80 mm (when a cable is connected)	φ16×30 mm

• Sensor for calibration:Engine rotation detectors, accelerometers, microphones etc. ···The sensor used when calculating rotation ratio between an alternator and an engine.
Ignition pulse detector (Primary side) IP-292	Ignition pulse detector (Secondary side) IP-296	Ignition pulse detector IP-3000A	Ignition pulse detector IP-3100

Engine vibration detector (High-sensitive type) VP-202/1220	Piezoelectric-type accelerometer NP-2000/3000 Series	Microphone + preamplifier MI Series	Cigarette light socket sensor FT-0801
			Input voltage:12 V, 24 V Cable length:2 m Connector:BNC

Related information

Revised:2013/01/07