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Weighing indicator

Product outline

Weighing process can be visualized and configured in shorter time while keeping the top-class accuracy.


F820 is a weighing indicator designed for industrial weighing system.

F820 has high technical specifications, equipped with various functions like high-precision amplifier with ultra-low drift, high-speed sampling, weighing sequential control functions, control I/O useful for automated weighing machines, and so on.

With using special PC software, setting of the controller can be performed while monitoring the process in curve/waveform; thus, the time required for initial setup can be greatly saved.



Visualize the weighing process!

Visualization of weighing process

Fluctuations of weight can be displayed and monitored in curves. Since waveform and I/O status can be monitored at the same time, you can find out the cycle time and check weight fluctuations when SP1, 2, CMP signal turns ON/OFF.


Enlarged waveform display

Enlarged waveform display
You can select and zoom a section to check in zoom.
With the enlarged view, you can check if weight readings is stable enough and if Set Points and the sampling rate are set properly.

Filter effect

Filter effect
Filter settings can be changed, and the effect of filters can be simulated on PC to check if noise and vibration are effectively attenuated.

Edit/save settings

Edit/save settings
Settings of F820 can be edited and saved on PC (saved in CSV format). 
It is convenient to save the settings for backup and export it to other units.


Cumulative weight is calculated. Statistic like maximum, minimum, average (mean) weights are also calculated and displayed in this mode.


Waveform display to monitor weight fluctuations over a long period of time 
A maximum of 72 hours data recording


High-performance filters to attenuate vibration

Fast and accurate weight measurement can be achieved in an environment with a lot of vibration. Digital low-pass filter and moving average filter can be adjusted in fine increment.

High-speed sampling & high-resolution display

It is equipped with an A/D converter with the sampling rate of 1200 times/sec. and a high-speed digital processor (sampling speed can be changed to 300 times/sec. as well). Also, high display resolution of 1/10000 is guaranteed in all input range.

Ultra-low drift

With high-precision amplifier, ultra-low drift of 0.1μV/℃ has been achieved!

Store 100 sets (codes) of settings

Up to 100 sets of parameter settings including, Final, CMP., Free Fall Compensation and so on are stored on internal memory. By key control or sending a signal from external devices, you can switch from one setting to others.

Measurement sequence function

Sequential control is possible without PLC and other external devices. By setting various parameters and using various timers, you can configure sophisticated weighing system. 

■Feed and discharge gate control
F820 has sequence control functions useful for direct control of feed or discharge gate like auto feed adjustment in case the total weight is under the target weight.

■Twin net weigher mode
F820 is equipped with functions useful for twin net weigher (bagging machines) such as ''clamp'' signal output, alternative discharge and so on.

Example applications

Example applications



Analog section
Excitation voltage 5 Vdc±5% Output current: within 90mA Ratiometric method
(Up to 6 load cells at 350Ω can be connected in parallel.)
Signal input range -0.5 to 3.0mV/V
Zero adjustment range -0.2 to 2.0mV/V (automatic adjustment by digital computation)
Gain adjustment range 0.3 to 3.0mV/V (automatic adjustment by digital computation)
Minimum input sensitivity 0.15μV/count
Accuracy Non-linearity:within 0.01%/FS 
Zero drift:0.025μV/℃RTI Typ  
Gain drift:1ppm/℃ Typ
A/D converter Speed:1200, 300 times/sec. (selectable)
Resolution: 24bit (binary)
Min. display resolution 1/10000
Theoretical calibration equivalent input calibration (accuracy when theoretical calibration is 
performed at ambient: 1/1,000)
Low-pass filter When A/D conversion rate is 1200 times/sec: 6, 8, 10, 12, 16, or 20Hz (selectable)
When A/D conversion rate is 300 times/sec: 1.5, 2, 2.5, 3, 4, 5Hz (selectable)
Moving average filter 1 to 512 times
Display section
Display unit Main display: numerical display (7-digit) with a character height of 18 mm 
by fluorescent display tube
Code (blend):Character height 8mm, numerical display by 7-segment 
green LED (2-digit)
Weight display 5-digits (signs: minus sign on the highest numerical digit)
Display frequency 1, 2, 5, 10 and 20 times/sec (selectable)
Scale capacity 5-digit numerical values
Minimum scale division/increment 1 to 50(selectable)
Unit of measurement NONE, g, kg, t, or lb (selectable)
Decimal place 0, 0.0, 0.00, or 0.000 (selectable)
Over scale display LOAD (A/D converter input over), 
OFL1; (Net weight > Net over set value) , 
OFL2: (Gross weight >Capacity +9 scale divisions), 
OFL3; (Gross weight > Gross over set value)
Center zero display true zero point or the center of each value
Setting section
Setting method Can edited with using membrane switch. Setting can be performed by external 
devices as well via USB, RS-232C and RS-485 interface and so on.
Setting value memory Parameter, calibration and part of other settings are stored on NOV.RAM 
(non-volatile memory), and all other settings are stored on F.RAM (another 
non-volatile memory).
Setting value protection Overwrite protection by ''LOCK'' switch
Setting items Upper Limit / Lower Limit / Near Zero / Set Point 1 / Set Point 2 / Compensation / Over / Under / Final / Comparison Inhibit Time / Judging Time / Complete Output Time / Compensation Feeding Time / Auto Free Fall Compensation Regulation / Weighing Function 1 / Weighing Function 2 / Tare Setting / Tare Display / Digital Low Pass Filter / Moving Average Filter / Sample Speed / Motion Detection (Period-Range) / Zero Tracking (Period) / Zero Tracking (Range) / Weighing Function 3 / Key Invalid ・ Lock / Error Output Selection / Password / Bag Clamp Output Time/ Discharging Time / Weighing Start Time / AZ Times / Judging Times / Sequence Mode 1 / Sequence Mode 2 / Extended Function Selection 1 / Extended Function Selection 2 / I/O Input Check / I/O Output Check/ BCD Input Check / BCD Output Check / RS-485 Check / Balance Weight Value / Capacity / Min Scale Division / DZ Regulation Value / Display Selection / Gravitational Acceleration / Net Over / Gross Over / RS-485 I/F Setting / RS-485 Communication Type / RS-485 ID / RS-232C I/F Setting / RS-232C Communication Type / D/A Output Mode / D/A Zero Output Weight / D/A Full Scale Value / BCD Data Update Rate / Zero Calibration / Span Calibration / Equivalent Calibration / Output Monitor Display / Option Display
External signal
External output (16 points) Transistor open collector output. 
Isolation : photo coupler, Rated voltage : 30V, Maximum current : 120mA
External intput(22 points) The signal can be outputted by making short-circuit between input and 
common terminal. 
Isolation : photo coupler
USB USB interface
SIF 2-wire serial interface
232 RS-232C communication interface (option)
BCO BCD parallel data output interface (option)
DAC D/A converter interface (option)
485 RS-485 communication interface (option)
There is a option board slot only for RS-232C. Another option interface (only one option) can be installed as well.
General performance
Operating voltage AC100 to 240V(+10% -15%)[50/60Hz]
Rush current 2A, 1msec:AC100V average load condition (cold start at room temperature)
4A, 1msec:AC200V average load condition (cold start at room temperature)
Power consumption approx.18W
Operating conditions Operation temperature range:-10 to 40℃ 
Storage temperature range:-20 to +85℃
Humidity: 85%RH or less (non-condensing)
Dimension 192(W)×96(H)×145(D)mm (Projections excluded)
Panel cutout size: 186(W)×92(H)mm
Weight approx. 1.7kg
AC power cable (voltage resistance:125 Vac ) (2m)  ×1
Load cell connector (JR connector) ×1
Connector rubber for load cells ×1
57 series connector for external input/output ×1
Mini screwdriver   ×1
Operation manual  ×1
BCD output connector (when BCO option is installed) ×1
D/A converter connector (when DAC option is installed)  ×1
RS-485 connector (when 485 option is installed)  ×1
Optional accessories
CAAC3P-P2 AC power cable 2m
CAAC3P-CEE7/7-P1.5 AC power cable (voltage resistance: 250 Vac) 1.5m
CN3P-2P 3P-2P converter plug for AC input cord
CA4131 (6-wired)cable with JR connector at one end 3m
CA4230 JR-PRC (6-wired)conversion relay cable 0.3m
CA4311 JR-PRC (6-wired)conversion relay cable (4-wired to 6-wired)(for 520A use)1m
CN10 Loadcell connector (JR connector)
CN21 BCD output connector
CN22 57 series 50p connector for external input/output
CN34 D-Sub 9p connector for RS-232C
CN70 D/A converter connector

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