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

STEP1 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.
     
STEP1 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 
 
STEP1 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

OM-1200 Motor/gasoline engine RPM detector

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

Motor/ engine
RPM detector
OM-1500

OM-1500 Motor/gasoline engine RPM detector

 

  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

IP-292 Ignition pulse detector

IP-296 Ignition pulse detector

IP-3000A Ignition pulse detector

IP-3100 Ignition pulse detector

Engine vibration detector (High-sensitive type)
VP-202/1220

Piezoelectric-type accelerometer
 NP-2000/3000 Series
Cigarette light socket sensor
FT-0801

VP-202/1220 Engine vibration detector

 

NP-3000 Series Piezoelectric-type accelerometer

 

FT-0801 Cigarette light 
socket sensor

Input voltage:12 V, 24 V
Cable length:2 m
Connector:BNC

Revised:2013/01/07



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