Ono Sokki TM-3100 Series Digital Tachometer

TM-3100 series is a new model of digital tachometer which responds to changes in diverse measurement objects by adding function in order to match your application.

The each model of TM-3100 series has the most fundamental function in rotational measurement (display of rotation speed, BCD output, analog output or comparator output) and can be customized by adding optional cards.

The fluorescent display tube of TM-3100 series greatly improves stability and readability instead of using LED as old models.

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  • Basic model for measurement and display
  • With BCD output of 6-digit display

  • Open collector output for direct connection with a PLC*.

  • Output mode is selectable from normal or request.

*Output can be optionally changed as Voltage output.

  • With analog output (Output signal is selectable from voltage or current.) It can be output and stored to a recorder etc.
  • Adopting D/A conversion allows improving its output refresh time at 10 ms.
  • With comparator function
    Up to three combinations of upper/lower-limit determination can be setup. It is useful for an alarm control.
  • High speed response of relative frequency approx. at 10 ms.
  • Equipped with wide variety of output functions as standard.

  • High response speed at 100 kHz.
  • Able to add more functions by optional cards.
  • The fluorescent display tube greatly improves stability and readability.
  • Applicable to CE marking and improved the tolerance to noise.
  • Applicable to DIN standard.

Table of optional card combination

Name of optional card
TM-0321 BCD output (Voltage Output)
(open collector)
Analog output
Comparator output
DC power operated





◎: Provided as standard ○:: Provided as an option ×Can not be built-in
*TM-0321 or TM-0322 and TM-0350 cannot be assembled in the same system configuration at the same time.
*TM-0321 and TM-0322 cannot be assembled in the same system configuration at the same time.

Input section
Input terminal
M3 free terminal screw
Input impedance
10 kΩ or more
Input format
Voltage or non-voltage
Input amplification
AC or DC
Applicable detector
Electromagnetic/magneto-electric/photoelectric detector, rotary encoder, proximity switch
AC amplifier
  • Signal waveform: Sine or Square wave
  • Signal voltage range: Sine 0.2 to 45 Vrms, square wave: 0.6 V to 63 Vp-p
  • Signal frequency range: 1 Hz to 100 kHz
DC amplifier
  • Signal waveform: Square waveform having a pulse width at 5 μs or more.
  • Signal voltage range: Hi level: +4 to +30 V, Lo level:-1 to +1 V
  • Signal frequency range: 0.1 Hz to 100 kHz
Low pass filter
Selectable from OFF (100 kHz)/100 Hz/20 kHz
Pulse output section
Output voltage
Hi level +4.5 V or more
Low level +0.5 V or less
Output logic
Load resistance
100 kΩ or more
Output terminal
M3 free terminal screw
Display device
Fluorescent display tube (selectable of three-stage brightness, 6-digit display)
Display refresh time
Selectable from 0.2 s (factory setting), 0.4 s, 0.5 s, 0.6 s, 0.8 s, 1.0 s to 10 s (in 1.0s step).
Unit of measurement

Calculation item


Rotation speed
r/s, r/min, r/h
Circumferential speed
mm/s, m/s, mm/min, m/min
Moving speed
mm/s, m/s, mm/min, m/min, km/min, mm/h, m/h, km/h
s, min
Times (1/s)
1/s, 1/min, 1/h
Hz, kHz
ml/s, ml/min, ml/h, l/s, l/min, l/h
Passing time
s, min
(Engineering unit)
EU/s, EU/min, EU/h
Number of decimal points
Selectable from OFF (factory setting), number of decimal point of 1, 2 and 3 digit
SIG indicator
Blink in synchronization with input signal
Error display
Backup memory error, board error, input frequency error, display digit error, memory full error, setup value error
Calculation display
Rotation speed, circumferential speed, moving speed, period, times(1/s), frequency, flow, passing time
Measurement method
Periodic calculation method
Calculation time
10 ms + 1 period time
Measurement accuracy
Display value × (±0.01 %) within ±1 count

*The display value indicates the count value except the decimal point.

Auto zero function
The display value becomes zero with no signal input for the setup time in advance.Selectable from below;
OFF (11 s), 0.5 s, 1.0 s, 2.0 s, 3.0 s, 4.0 s, 5.0 s, 6.0 s, 7.0 s, 8.0 s, 9.0 s, 10.0 s
Rapid deceleration follow-up function
If an input signal rapidly decreases and there is no signal input to tachometer approx. 1 second or more, measurement automatically decelerates with this function and then zeroed in approx. 11 seconds later.
Moving average function
Selectable from below:
OFF (factory setting), 2, 4, 8, 16, 32, 64, 128

*Analog output by TM-3130/0330 is obtained by the processing of
moving average with the calculation at every 10 ms.

Peak-hold function
Hold the peak value (maximum, minimum, average) between start and stop status.
Panel condition memory
Memorize 4 kinds of measurement conditions.
(The setup conditions can be stored and recalled.)
Power supply for detector
Output voltage
12 VDC ±10 %
Maximum output current
100 mA
General specifications
Power rating
100 to 240 VAC (50 Hz/60 Hz)

*Cable for power supply is sold separately.

Withstand voltage
1500 VAC (1 min)
Insulation resistance
10 MΩ or more (at 500 VDC by megohhom )
Power rating
  • 11 to 19 VA (TM-3110)

  • 13 to 21 VA (TM-3120)

  • 16 to 25 VA (TM-3130)

  • 12 to 21 VA (TM-3140)

(Power rating is 20 to 30 VA when analog, BCD and
comparator output cards are equipped.)

Operating temperature range
0 to +50 °C (with no condensation)
Storage temperature range
-10 to +60 °C (with no condensation)
Outer dimensions
96(W) × 48(H) × 148(D) mm
Approx. 310 g
Applicable standards
CE marking
Low Voltage Directive EN61010-1: 2010 (3rd)Overvoltage Category II/Pollution Degree 2
EMC(Electromagnetic Compatibility)Directive
Embedded board type EN61326: 2006
Panel mounting fixtures x 1 set

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