ONO SOKKI - SE-2500A Gasoline Engine Tachometer

SE-2500A

SE-2500A is a non-contact handheld tachometer designed for gasoline engine measurement. Detection, measurement, and display parts are all in one unit and batteries are built in the unit. Moving the detector (head of the SE-2500A) close to an ignition coil can measure rotation speed at the unit of 1 r/min or 0.01 r/s. Up to 20 measurement data can be stored in the internal memory that is convenient for later checking.

Both analog (able to switch over to monitor output) and pulse outputs are provided as standard. Analog output signal can be used for the data recording by recording device. Monitor output is used for checking sensor waveform or input signal of FFT Analyzer. Pulse output signal is used for tracking analysis signal for FFT Analyzer.

* IP-2800 External sensor (discontinued) is not provided as standard.

VP-201/1210
External detector (option)

*Please prepare batteries for power supply by yourself.

Featute

Easy and safe measurement by non-contact measurement method
Accurate rotation speed measurement by the unit of 1 r/min or 0.01 r/s
Easy to identify the displayed value with large LCD with backlight even when the surrounding is dark
Up to 20 data can be stored by memory function
Analog and Pulse outputs are provided as standard

Analog output - 0 to 1 V/0 to F.S (F.S. : can be set optionally), 10-bit D/A conversion
Pulse output - Hi : +4.5V or more, Lo : +0.5V or less

Rotation speed of 4-cilinder diesel engine can be measured with the VP-201/1210 (optional detector) *

* It may not be measured depending on an engine.

Measurement method

Specifications

Applicable engines

Gasoline engines

Calculation method

Cycle calculation method

Measurement time

Within 1s + the time required for one cycle of input signal

Measurement unit

r/min, r/s

Measurement ranges

2-cycle	4-cycle	Number of rotations (r/min)
-	1 cylinder	120 to 20000 r/min
1cylinder	2 cylinders	120 to 20000 r/min
-	3 cylinders	120 to 20000 r/min
2 cylinders	4 cylinders	120 to 20000 r/min
-	5 cylinders	120 to 20000 r/min
3 cylinders	6 cylinders	120 to 15000 r/min
4 cylinders	8 cylinders	120 to 12000 r/min
-	10 cylinders	120 to 10000r/min
-	12 cylinders	120 to 8000r/min

(r/s is the numerical value obtained when the r/min measurement value is divided by 60)

Measurement
accuracy

Display value*× (±0.02 %)± 1 count
*The display value is the count value excluding figures after the decimal point.

Detection method

Electromagnetic induction

Detection distance

10 to 200 mm

Detected object

Ignition coil

Selection of number of cylinders · number of cycles

By internal signal selector

Display

5-digit, LCD, 7-segtment, with backlight (character height : 10.2 mm)

Over-range function

The over-range alarm (ERROR mark) is displayed when the measured value exceeds the display range.

Rotation upper limit alarm function

The upper limit alarm (↑ mark) is displayed when the number of rotations exceeds the preset upper limit value.

Analog output

Output with respect to the displayed rotation values.

Output voltage : 0 to 1 V/0 to full scale (full scale : can be set optionally)
Conversion method : 10-bit D/A conversion
Linearity : ± 1 %/ full scale
Output update time : within 50 ms+the time required for one cycle
Temperature stability : ±0.05 %/full scale / ℃ (span&zero)
Setting error : ±0.5 % / full scale
Load resistance : 100 kΩ or more

Monitor output

Analog output for monitoring purpose after waveform reshaping of the sensor signal (Analog or monitor output selectable)