Product outline

F325 is a digital indicator for strain gage type sensors (DIN 96 x 48 mm 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 DC 10 V, 2.5 V±10% (Depending on setting)
Output current: within 30 mA
Signal input range -3.0 to +3.0 mV/V
Accuracy Non-linearity: 0.02% FS±1 digit (at 3 mV/V input)
Zero drift: within 0.5 μV/℃ RTI
Gain drift: within 25 ppm/℃
A/D converter Speed: 30, 300, 3000 times/sec. (Depending on setting)
Resolution: 24 bit (binary)
Analog filter Primary low-pass filter
select frequency from 10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz 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 300 Hz, 300 times/sec.: 1 to 30 Hz, 30 times/sec.: 0.1 to 3 Hz
Filter 2: Moving average
You can set the value anywhere between OFF, 2 to 999 times.
Resolution 1/30000 (at 3.0 mV/V input)
Analog monitor output Sensor input of approx. 2 V per 1 mV/V (Input resistance over 2 kΩ or more)
Hold function Sample or peak hold (You can chose either analogue or digital peak hold from setting menu. Frequency response of analogue hold is 1 kHz)
Display section
Display unit 15 mm 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: DC 12 V, When short-circuited: Approx. 4 mA
<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: DC 27.6 V, “ON”: when the voltage is above DC 9 V (Load Current: approx. 10 mA at DC 24 V), “OFF: ” below DC 3 V.
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: DC 30 V, maximum rated current: 100 mA, operating time: approx. 1 msec
(Only one option can be installed)
485 RS-485 communication interface (Modbus-RTU/ UNI-format)
BCD BCD parallel data output interface (sink type) (Option)
BSC BCD parallel data output interface (source type) (Option)
DAV D/A converter (voltage output) (Option)
DAI D/A converter (current output) (Option)
232 RS-232C communication interface (Option)

General specifications
Power supply voltage AC spec.: AC 100 V to 240 V (+10% -15%) (free power supply 50/60 Hz)
DC spec.: DC 12 V to 24 V (±15%) (please specify the type of input when ordering)
Power consumption AC spec. 3 W typ. / DC spec. 4 W typ.
Rush current Typ.
AC spec.
2 A, 1 msec:AC 100 V average load condition
(cold start at room temperature)
4 A, 1 msec:AC 200 V average load condition
(cold start at room temperature)
Rush current Typ.
DC spec.
2 A, 20 msec:DC 12 V average load condition
(cold start at room temperature)
1 A, 50 msec:DC 24 V 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)
External Dimensions 96(W) × 48(H) × 132.5(D) mm
(Not including projections)
Weight Approx. 600 g
CE marking certification EMC directives: EN61326-1
Safety standard: EN61010-1, EN62311
AC input cord
(AC power supply is selected)
3P-2P conversion adapter
(AC power supply is selected)
Operation manual 1
I/O connector block (wire entry holes: bottom)*1 1
I/O connector block (wire entry holes:top)*1 1
Terminator (RS-485 is selected) 1
BCD output connector (BCD output option is selected) 1

*1 Already mounted on the main unit


Optional accessories

CA325AC3P-B3 AC input cord 3 m
CA325AC3P-CEE7/7-B2 AC Supply cord (Voltage resistance: 250 V) 2 m
CN3P-2P 3P-2P converter plug for AC input cord
CN51 BCD output connector
CN82 I/O connector block (wire entry holes: front)
CN83*2 I/O connector block (wire entry holes: bottom)
CN84*2 I/O connector block (wire entry holes: top)
TSU03 DC Lighting surge unit

*2 Same accessory as the attached one

Please note that there are possibilities of individual differences in a color tone on display devices such as LEDs, fluorescent display tubes and LCDs due to manufacturing process or production lots.

Structure of product code



Product catalogue(PDF)
⇒Download Page
Operation manual(PDF)
External dimension
Support tools