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Diesel Engine Tachometer
GE-2500

The GE-2500 Diesel Engine Tachometer is a new measurement method that determines the engine speed by measuring the alternator speed, utilizing the proportional relationship between the engine speed and the alternator speed.

For measuring the alternator speed, a dedicated compact detector, the OM-1500, has been developed. The OM-1500 detects the leakage magnetic flux of the alternator and measures the speed by connecting it to the GE-2500.
(The OM-1200 can also be used.)

Please note:
Depending on the type of engine and motor, the GE-2500 may not be able to measure or the measurement range may vary.
For engines or motors that have not been used, please confirm with a demo unit.
For demo units, please contact your nearest sales office.

Features

  • A tachometer that can reliably measure the rotation of any type of engine. It can measure both diesel and gasoline engines.

  • By utilizing the rotation speed of the alternator, it can be measured regardless of the type of engine or the number of cylinders.

  • Equipped with automatic calibration functionality. It automatically determines the ratio of the rotational speeds of the alternator and the engine.

  • To determine the engine's rotation speed from the alternator's rotation speed, it is necessary to perform calibration beforehand and find the rotation ratio.

  • Easy to set up. The installation position of the sensor is clear, and measurements can be taken even with a rough installation.

  • Measurement of the target vehicle is possible even while it is in motion or operation.

  • It is possible to measure even small signals using the FFT calculation method.

  • It is possible to perform stable measurements that are resistant to noise.

The GE-2500 has made measurements that were previously difficult possible.

Comparison data (6-cylinder engine)

Comparison data (6-cylinder engine)

In conventional models, measurement was possible around the idling rotation speed, but there were areas where measurement could not be done as the rotation speed increased.
With the GE-2500, stable measurement is possible across all areas.

System Configurations

  • System Configurations

measurement method

  1. Install a sensor on the alternator.

  2. Perform calibration to determine the ratio of the rotational speeds of the alternator and the engine.

  3. Measurement Start

  1. STEP1

    Install a sensor (OM-1500 or OM-1200) onto the alternator.

  1. Install and secure the sensor so that it is perpendicular to the rotational axis of the alternator.

  2. Connect to the 'MAIN' connector on the back panel of the GE-2500.

  • Install a sensor (OM-1500 or OM-1200) onto the alternator.

  1. STEP2

    Perform calibration and set the ratio of the alternator to the engine speed on the main unit (GE-2500).

  • when using calibration sensors

  • If setting manually (choose one from three types).

    [Notice] Please keep the engine in an idling state during calibration.

when using calibration sensors

Simultaneously measure the rotational speed of the engine and the alternator, and automatically calculate the speed ratio.

  • when using calibration sensors

If setting manually (choose from 3 types).

  • Input the pulley ratio and the number of poles of the alternator.

Input the pulley ratio and the number of poles of the alternator.

  • Input the rotation ratio (the ratio of the alternator's rotation speed to the engine's rotation speed).

Input the rotation ratio (the ratio of the alternator's rotation speed to the engine's rotation speed).

  • Input the engine RPM at idle.

Input the engine RPM at idle.

  1. STEP3

    After calibration is completed, remove the calibration sensor and start measurements using only the measurement devices (OM-1500 or OM-1200).

The rotational speed ratio value obtained through calibration is automatically saved in the GE-2500 main unit. Up to five conditions can be saved in the main unit.

Specifications

Measurement Department
measurement target Diesel engines, gasoline engines (engines without an alternator cannot be measured)
calculation method FFT calculation method
Input frequency range 1 kHz, 2 kHz, 5 kHz (measurement mode MAIN) / 500 Hz (calibration mode REF)
measurement accuracy ±2 × rotational speed resolution [r/min] ±1 count
rotational speed resolution Frequency range (Hz) ÷ 12800 × 60 ÷ gear ratio
Display Section
display fluorescent display tube
Display update time Select from 0.2, 0.5, 1, 2 (seconds)
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 combination AC coupling
Constant current drive power supply 2.2 to 3.2 mA (only for REF)
Analog Output Section
REVO
output content Output for rotational speed calculation value.
voltage range 0 to F.S. / 0 to 10 V (full scale can be set arbitrarily)
conversion method 12 bit D/A conversion method
linearity ±0.3% / F.S.
Output update time within 200 ms
load resistance more than 100 kΩ
Output Connector BNC
SIG
output content The output signal from the sensor input into MAIN (used for analog output and switching).
load resistance more than 100 kΩ
Output Connector BNC
Pulse Output Section
output content The frequency of the rotational speed calculation value is output as a pulse
[Example: At 6,000 r/min, 100 Hz Duty 1:1]
output voltage Hi: above +4.5 V / Lo: below +0.5 V (without load)
Output update time within 200 ms
load resistance more than 100 kΩ
Output Connector BNC
General Specifications
Power Supply DC 12 to 24V
Power consumption 8 VA or less
Operating temperature range 0～＋40 ℃
Operating Humidity Range 20 to 80% RH (without condensation)
Storage Temperature Range -10 to +55 °C
Storage Humidity Range 20 to 80% RH (without condensation)
Outline Dimensions Approximately 144 (W) × 72 (H) × 180 (D) mm (excluding protrusions)

Outline Dimensions
Weight below 2 kg
Standard Compliance with CE marking and RoHS.
Accessories One copy of each of the three types of instruction manuals, four types of rubber feet.
  • GE-0102 Cigar socket power cable 1.5 m, 1 piece
Price  
Option
  • GE-0102 シガーソケット電源ケーブル 1.5 m：
    （GE-0102 は GE-2500本体に付属しています）

* Depending on the type of engine and motor, measurement may not be possible. Please check with the demo equipment. For demo equipment, please contact your nearest sales office.
* This product assumes that the alternator and engine rotations are synchronized.
* If there is a special alternator or slack in the belt connecting to the engine, measurement errors may increase, and measurement may not be possible.

Related products

Measurement sensor: Alternator rotation detector... A sensor that detects the rotation speed of the alternator from leakage magnetic flux.
Model モーター/エンジン回転検出器
OM-1200
 		モーター/エンジン回転検出器
OM-1500
Motor/Engine Rotation Detector OM-1200

*Cable sold separately
MX-005, MX-010, etc.

 Motor/Engine Rotation Detector OM-1500
Detection method

electromagnetic induction method
cable length (sold separately) 4.9 meters
Operating temperature range 0～+80 ℃ -10～+100 ℃
Weight approximately 65 g

Approximately 130 g (including cable)
Outline Dimensions

φ16×54 mm
(sensor only)
φ16×80 mm
(when connected with cable)

External Dimensions No.1

Diameter 16 × 30 mm

External Dimensions_No.2
calibration Sensor: Engine rotation detector... A sensor used to determine the rotational ratio between the alternator and the engine.
Ignition detector (for primary side)
IP-292		 Ignition detector (for secondary side)
IP-296		 Engine rotation detector
IP-3000A		 Engine rotation detector
IP-3100
Ignition Detector (for Primary Side) IP-292 Ignition Detector (for Secondary Side) IP-296 Engine Rotation Detector IP-3000A Engine Rotation Detector IP-3100
       
Engine RPM detector
(high sensitivity type)
VP-202 / VP-1220		 Piezoelectric accelerometer
NP-3000 series		 Microphone + preamp
MI series		 Cigar lighter socket sensor
FT-0801
Engine Rotation Detector (High Sensitivity Type) VP-1220 Piezoelectric Accelerometer NP-3000 Series Microphone + Preamp MI Series Cigar Lighter Socket Sensor FT-0801Input voltage: 12 V, 24 V
Cable length: 2 m
Connector: BNC
VP-202
VP-1220 		     
Inquire about this product.

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Outline Drawings

Instruction Manuals

最終更新日:2025/09/03