Photo (Advanced Tachometer FT-2500)



FT-2500 advanced tachometer measures the rotational speed by using the signal of change in sound, vibration or magnetic flux from rotating machines such as motor or the like.


The use of FFT technology enables the FT-2500 to calculate and display the rotational speed of any complex waveform signals from microphone, sound level meter or vibration sensor by extracting the frequency component which is equivalent to the rotational speed.


The FT-2500 has several advantages over conventional tachometers. Even though the rotating shaft is not accessible, it allows easy evaluation of the rotation object such as motor which has already been built in product. There is no need to affix reflective mark to the measurement object or special machining to the rotating shaft. A newly developed algorithm is incorporated in the FT-2500 so that not only the steady rotation of motor or engine but also the status of the accelerated/decelerated rotation can be measured with high response.



  • It does not require reflective marks or special machining to install a detector.
  • The rotation measurement can be performed easily from direct signal of sound or vibration.
  • Newly algorithm is incorporated, which allows to follow the change in rotational speed or acceleration/deceleration.
  • Not only the analog output function for rotational speed, but also the pulse output function which is corresponding to rotational speed is provided.
  • Equipped with RS-232C communication function as standard.


Outline Specifications

Input section
Applicable sensor FT-0501, IP-292/296, IP-3000A/3100, VP-202/1220, OM-1500/1200
Constant Current Line Drive sensors, microphones, accelerometers and so on.
Measurement section
Measurement mode 1.Steady rotation measurement mode
  ・Frequency range: 500 Hz, 2 kHz, 10 kHz
  ・Resolution =Frequency range ÷ 12800 × 60 ÷set pulse count

2.Rotation acceleration/deceleration measurement mode
  ・Frequency range: 250 Hz, 500 Hz, 2 kHz
  ・Resolution=Frequency range ÷ 6400 × 60 ÷set pulse count

Rotating direction acknowledgment Available when FT-0501 is in use.
Measurement accuracy ±2 x rotating speed resolution ±1 count
Averaging processing Moving average processing, allowable count: OFF, 2, 4, 8, 16
Filter function Can be set voluntary (Specifying each one of upper and lower rotating speeds.)
Display section
Display update time 0.5 ±0.2 second
Measurement display range 0 to 999,999 r/min(0 to 10,000 Hz)
Output section
Analog output voltage range 0 to 10 V/0 to F.S.
Rotational speed can be specified voluntary at 10 V output.
Analog output update time Steady rotation measurement mode: 500 ms or less
Rotation acceleration/deceleration mode: 250 ms or less
Sensor signal output for monitoring Sensor signal output for monitoring
(The output can be selectable from analog or monitor output.)
Comparator output Upper/lower-limit determination, rotating direction acknowledgment, OK determination
Output method: semiconductor relay (3 circuits are built-in.)
Pulse output Output the frequency equivalent to the displayed rotational speed x set P/R
(Hi: 4.5 V or more, Lo: 1 V or more)
External interface RS-232C, External command input connector
Memory section
Condition memory Saving 3 kinds of setting conditions.
General specifications
Power requirement 100 to 240 VAC(50/60 Hz)
Power consumption 32 A or less
Operating temperature range 0 to +40 °C
Storage temperature range -10 to +55 °C
Outer dimensions 144(W) × 72(H) × 180(D) mm
Weight Approx. 1.2 kg
Accessories Panel mounting fixture, stand foot, rubber foot, connector (D-SUB <15-pin, plug>), Power cable (3P-3P, 1.9-m) .......... (1 pc. for each)
Option AX-5022A RS-232C cable FT-0100 Analog output cable(1.5m R03PB3M-BNC245)
FT-0110 Pulse output cable(1.5m D-SUB15PIN-BNC245)
FT-0251 Ethernet communication function : [Discontinued]
(RS-232C function cannot be used when Ethernet option is equipped.)

The FT-2500 uses non-volatile memory to store parameters. A non-volatile memory has a limitation of rewritable frequency. Under general using condition, the number of rewriting will not exceed 1 million times which is the maximum rewritable times of the non-volatile memory used in this model. However, it shall not be applied with the case which you often send a numerical value setting commands via RS232C. If [MEMORY Error!] appears, it is the sign that the memory has a trouble and needs memory replacement (fare-paying). Please contact your nearest distributor or send us an e-mail (

Applicable sensors (option)

Ignition pulse detector
(Primary side)

Photo(IP-292 Ignition pulse detector)

Ignition pulse detector
(Secondary side)

Photo(IP-296 Ignition pulse detector)

Ignition pulse detector

Photo(IP-3000A Ignition pulse detector)

Ignition pulse detector

Photo(IP-3100 Ignition pulse detector)

Motor/gasoline engine RPM detector

OM-1500 モータ/エンジン回転検出器 Photo(OM-1200 Ignition pulse detector)

DC motor rotation detector

Photo(FT-0501 Magnetic flux leakage sensor)

Piezoelectric-type accelerometers
NP-2000/3000 Series

Photo(Piezoelectric-type accelerometers)

* Charge amplifier is required additionally when NP-2000 series accelerometer is used.

MI Series


Photo(Microphone+preamplifier MI Series)

Engine rotation detector

Photo(Engine rotation detector)

Engine rotation detector
(High-sensitive type)

Photo(Engine rotation detector (High-sensitive type)

Cigarette lighter socket sensor

Photo(FT-2500 Advanced Tachometer)

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

LED reflected-light optical
fiber sensor
(made to order)

Photo(LED reflected-light optical fiber sensor)

* Matching adjustment such as adding connector will be required to connect to the FT-2500.




Copyright © ONO SOKKI CO.,LTD All Rights Reserved. | Terms of use | Privacy policy