Product outline

F331 is a digital indicator for strain gauge sensors to measure load, torque, pressure and displacement. Compact and simple configuration, practical machine with features such as hold and judgment.

  • Judgment function
    Upper and lower limit comparison and judgment result output
    Output (2 points) : Selectable from OK・NG・HH・HI・LO・LL
  • HOLD function
    Hold function with the speed of A/D converting 300 times/sec. (Sample・Peak・Bottom・P-P)
  • Wealth of interface
    USB as a standard feature. BCD output, D/A converter(Current output), RS-485(Select from Modbus-RTU and original format), RS-232C are available as an option.
  • Special PC application software
    We prepared the special software that can easily set up F331, downloading of measured values and analyzing on a PC.

Setting and controlling can be done by a PC for installation and when you got NG judgement result.
■When installing

You can do initial setting and calibration. Installation task is easy because you can do it with confirming waveform data. PC is not required after operation is started.

  • Initial setting and calibrations
    You can do the read・write of the setting values and calibration.
  • Check by waveform
    It displays input signal in waveform.
    You can see output timing of upper/lower limit comparison and hold at a glance. Saving of waveform data is also possible.
■When continuous control is required for e.g. long term test

When it is required, you can read and record measured value in real time by connecting a PC all the time.
It records measured value and status(Upper/Lower limit, Hold) for up to 10000 times. You can check judgment result by the OK/NG counting function.

■If result is judged as NG(Not good)

You can pursue the cause by comparing parameter set and waveform data of NG result with the data of when it is installed.

Principal use

Suitable for production line quality control such as pressure load of press or swage machine, pass or fail judgment of the automated machines and testing machines.


Analog section
Sensor excitation voltage DC2.5V±10% Output current within 30mA : Standard specification 5V spec. (Please specify when ordering.)
(DC5V±10% Output current within 30mA)
Signal input range -3.0 to +3.0mV/V
Equivalent input calibration range +0.5 to +3.0mV/V
Equivalent input calibration error Within 0.1%FS(at 0.5mV/V input)
Accuracy Non-linearity : Within 0.02%/FS(at 3mV/V input)
Zero drift : Within 0.5μV/℃ RTI
Gain drift : Within 0.01%/℃
A/D converter Rate : 300 times/sec.
Resolution : 24 bits (binary)
Hold function Sample, Peak, Bottom, P-P
Display section
Display Character height 14.2mm Numerical display (4-digits), by 7-segment red LED
Indicated value Numeric 4-digits -9999 to 9999 (Minus is a most significant digit. It display at the status lamp.)
Decimal point The display position is selectable. (8.888、88.88、888.8、8888)
Display items Status display
3φ red LED ×2 (MINUS, HOLD)
3φ green LED ×1 (OK)
Display frequency 5, 10, 20 times/sec. selectable
Setting section
Setting method Setting by specific PC software with USB interface.
Preservation of data Stored in nonvolatile RAM (NOVRAM)
Key switch ZERO
Setting items Calibration: Zero calibration/ Span calibration (actual load calibration,equivalent input calibration)
HH limit, HI limit, LO limit, LL limit, Hysteresis, Digital offset, Near zero, Comparison timing, Moving average filter, Digital low-pass filter*, Hold mode, ZERO key valid/invalid, Display frequency, Decimal place, External output selection, Indicator ID, Loadcell ID, BCD output mode, BCD data update rate, BCD output selection, D/A output mode, D/A zero scale, D/A full scale, RS-485 communication mode, RS-485 I/F setting, RS-485 ID, RS-485 transmission delay time, RS-232C communication mode, RS-232C I/F setting, Setting value LOCK (485/232), Calibration value LOCK (485/232)
※3, 6, 12Hz selectable
External signal
  Comparison output (2 points), Hold/judgment signal input, Digital zero signal input
  USB interface
BCD parallel data output interface (sink type)(Option)
D/A converter (current output)(Option)
RS-485 communication interface (Select from Modbus-RTU and original format)(Option)
RS-232C communication interface(Option)
General performance
Power voltage DC24V(±15%)
Power consumption 6W max
Inrush current 0.7A, 18msec: DC24V average load condition
(cold start at room temperature)
Operation conditions Operation temperature: -10 to +40℃ Storage temperature: -40 to +80℃
Humidity:85%RH or less(non-condensing)
Dimensions 96(W)×48(H)×132.5(D)(mm) (not including protrusions)
Panel cut-out dimension 92×45(+1-0) (mm)
Weight Approx.550g
  ・Quick manual 1
・BCD output connector(When BCD output option is selected) 1
・Short bar(When RS-485 option is selected) 1


Model Description
BCO BCD parallel data output interface (sink type)
DAI D/A converter (current output)
485 RS-485 communication interface (Select from Modbus-RTU and original format)
232 RS-232C communication interface

Optional accessories

Model Description
CN51 BCD output connector
TSU03 DC lighting surge unit


Product catalogue(PDF)
GC2018_F331(1 MB)
Operation manual(PDF)
F331 Rev.1.03(2 MB)
F331 quick Rev.1.03(822 KB)
External dimention
Support tools
USB interfaces for F331
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