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Digital indicator with fast peak hold function


Product outline

F325 is a digital indicator for strain gage type sensors (DIN 96x48mm size). With analogue/digital hold function and high-speed signal processing capability (3000 times/sec.), it enables accurate measurements of pressure, force, torque, and other dynamic factors. It is equipped with serial interface (RS-485 or SI/F) , and up to 32 units of F325 can be connected on the same network (only with RS-485). It is ideal for applications with short cycle time, such as tablet press or plugging machines.

* D/A converter corresponds to voltage output and current output.

* BCD output corresponds to sink type and source type.

Analogue peak hold

The peak of analogue signal is captured by the peak hold circuit. Since it is independent of sampling speed, it can hold the peak value at faster speed.

Digital peak/ sample hold

The peak or a sample point of digitized measurement data is captured. It is ideal for applications where the stability of reading is required.

Hi-speed A/D conversion rate of 3000 times/sec. (resolution: 24 bit)

Analogue signal from a sensor can be converted to digital signal at the rate of 3000 times/sec.*.

* A/D conversion rate can be switched to 30 or 300 times/sec..   Then the effect of filter is enhanced, which, in turn, enables stable measurements.

The high-performance filtering functions by using both analogue and digital technology

Remove vibration and noise/external interference on input signal for “fast” and “accurate” reading.

Both analogue and digital filters (low-pass and moving average filter) can be used simultaneously.

Depending on requirements for applications (e.g. fast response, stable reading, etc.), you can select the optimal filter from wide range of selection.


You could chose either RS-485 (Modbus-RTU/ UNI-format) or SI/F(Unipulse original serial interface) as a standard interface.

Cover wide range of applications: fast response time and high accuracy

<Fast response>

F325 processes the analogue peak hold value at the speed of 3000 times/sec. and ouputs HI/OK/LO signal.

It is ideal for the application with short cycle time.


It can be also used for highly accurate weighing system by adjusting A/D conversion speed and/or filter setting.

Free software for parameter setting is available

F325 can be connected to PC via RS-485 or RS-232C, and parameter setting can be edited or saved on PC.


Analog section
Excitation voltage DC10 or 2.5V±10% (switchable)
Output current: within 30mA
Signal input range -3.0 to +3.0mV/V
Accuracy Non-linearity: 0.02%/FS±1digit (at 3mV/V input)
Zero drift: within 0.5μV/℃ RTI
Gain drift: within 25ppm/℃
A/D converter Speed: 30, 300, 3000 times/sec. (selectable)
Resolution: 24bit (binary)
Analog filter Primary low-pass filter
select frequency from 10, 30, 100, 300, 1k, 3k, 10k or 30kHz
Digital filter Filter 1: Bessel low-pass filter (secondary)
Cut-off frequency can be set to any value from 1/300 to 1/10 of sampling speed. It can be turned off.
3000 times/sec.: 10 to 300Hz, 300 times/sec.: 1.0 to 30.0Hz, 30 times/sec.: 0.1 to 3.00Hz
Filter 2: Moving average
You can set the value anywhere between 1 to 999 times.
Resolution 1/30000 (at 3.0mV/V input)
Monitor output Sensor input of approx. 2V per 1mV/V (Input resistance over 2kΩ)
Hold function Sample or peak hold (You can chose either analogue or digital peak hold from setting menu. Frequency response of analogue hold is 1kHz)
Display section
Display unit 15mm character height: 7-segment green LED (5-digits)
Numerical value: 5-digits Indicated value: -19999 to +99999
Decimal points: Selectable decimal point displaying position (0.000, 0.00, 0.0, 0)
Display items Status display: red 3φLED: HI, LO, PEAK, HOLD
green 3φLED: OK
Display frequency: selectable from 3, 6, 13 and 25 times/sec.
External I/O signal
 External input
<Volt-free contact input>
External devices can be connected, such as relays, switches, transistors and so on. The signal can be outputted by making short-circuit between input and common terminal.
In case transistor is connected, please use NPN (sink) transistor.
Internal power supply voltage: DC12V, When short-circuited: Approx. 4mA
<DC-Input for both plus common and minus common type> (please specify the type of input when ordering)
External devices can be connected, such as relays, switches, transistors and so on. Input signal is outputted by applying voltage between input and common terminal.
In case a transistor is connected, please use NPN type for plus common and PNP type for minus common.
Maximum Rated Voltage: DC27.6V, “ON”: when the voltage is above DC 9V (Load Current: approx. 10mA at DC24V), “OFF: ” below DC3V.
External output
HI, OK, LO, Output Selection 1, Output Selection 2
(Assign output from various selection: HH, LL, Overload, RUN, HOLD, NZ, DZ response)
PhotoMOS relay output (common for sink and source type)
Maximum rated voltage: DC30V, maximum rated current: 100mA, operating time: approx. 1msec
  RS-485 communication interface (Modbus-RTU/ UNI-format) or SI/F (Unipulse original serial interface)
BCD parallel data output interface (sink type) (Option)
BCD parallel data output interface (source type) (Option)
D/A converter (voltage output) (Option)
D/A converter (current output) (Option)
RS-232C communication interface (Option)
General performance
Power supply voltage AC100V to 240V (+10% -15%) (free power supply) 50/60Hz
DC12V to 24V (±15%) (please specify the type of input when ordering)
Power consumption 10W max
Rush current(Typ) AC spec. 2A, 1msec:AC100V average load condition
(cold start at room temperature)
4A, 1msec:AC200V average load condition
(cold start at room temperature)
Rush current(Typ) DC spec. 2A, 20msec:DC12V average load condition
(cold start at room temperature)
1A, 50msec:DC24V average load condition
(cold start at room temperature)
Operation condition Operation temperature range: -10 to +40℃
Storage temperature range: -40 to +80℃
Humidity: 85%RH or less(non-condensing)
Dimensions 96(W)×48(H)×132.5(D)(mm) (not including projections)
Panel cutout size 92×45(+1-0) (mm)
Weight Approx. 600g
CE marking certification EMC directives: EN61326-1
Safety standard: EN61010-1, EN62311
  ・ AC input cord * 1
・ 3P-2P conversion adapter * 1
・ Terminator (RS-485 is selected) 1
・ BCD output connector (BCD output option is selected) 1
・ Operation manual 1
* Included only for AC specifications


BCO BCD parallel data output interface (sink type)
BSC BCD parallel data output interface (source type)
DAV D/A converter (voltage output)
DAI D/A converter (current output)
232 RS-232C communication interface


Product catalogue(PDF)
F325 Product catalogue Dowmload
Operation manual(PDF)
External dimention
Support tools
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