Load Cell Indicator - Model IQ240

Load cell panel mount indicator
Model IQ240 
is a programmable panel-mount precision digital indicator for load cell and strain gauge applications.  The alphanumeric 6-digit high-bright LED display is quick and easy to set up with plain language helpful menu prompts.

With precision front end circuitry for high accuracy and stability, the ratiometric circuitry automatically compensates for temperature drift and excitation voltage variances due to cable loss.

The load cell excitation voltage is 5VDC for use with both 4-wire and 6-wire load cells, powering up to 6 x 350Ω load cells.

Advanced features include auto-zero tracking; user input linearisation; max/min recording; programmable front pushbuttons; 2 programmable digital inputs; security menu lockout; motion indication; advanced digital filtering; automatic offset calibration; plus many more to provide an all-in-one precision load cell indicator.

RS232 serial communications is supplied as standard with MODBUS™ RTU and MODBUS™ ASCII protocols.  A simple ASCII-out protocol is also provided for serial printing and communicating to large displays.

Model IQ240 options include up to 4 relays, analogue retransmission, a second serial RS485 interface and real time clock.

  • High bright 6-digit 14-segment LED displays for easy setup and calibration
  • 4 or 6 wire load cell / strain gauge input
  • Powers up to 6x350Ω load cells at +5VDC excitation voltage
  • High precision 24 bit ratiometric ADC front end circuitry
  • -199999 to +999999 display counts
  • Easy calibration using known weights
  • IP65, NEMA 4, UL Type 4, 48 x 96mm ABS/Polycarbonate enclosure
  • 16 Bit Analog output (0/4-20mA or 0-10V)
  • RS232 communications (MODBUS™ RTU / ASCII and Infiniteq ASCII protocols)
  • RS485 communications (MODBUS™ RTU / ASCII and Infiniteq ASCII protocols)
  • 2 Programmable digital inputs (pull up or pull down field jumper selectable)
  • 3 Programmable front panel push buttons
  • Universal mains switch mode power supply (85-264VAC) standard with built in EMI and fuse protection
  • 16 Point lineariser
  • Auto-zero tracking function
  • Automatic offset calibration
  • Tare function
  • Gross/Net function
  • Selectable and adjustable advanced digital filtering
  • Alarms, Motion indication and Net front panel status LED's
  • Max / Min recording
  • Security menu lockout
  • Built in menu help hints and prompts
  • Field upgradable firmware via the RS232 interface
  • 1 year warranty
General:Model IQ240
Display6-digit, 13.8mm (0.543”) 14 segment high brightness red LED
Display range-199999 to +999999
Decimal point 0 to 0.00000
Status LED's6 LED's for SP1 to SP4, Net, Motion
Digital Inputs2 Programmable digital inputs
Built in hysteresis, filter and input over voltage protection
Maximum input voltage <30VDC
Input logic is field jumper selectable
(Pull up, sinking inputs) - 10kΩ internal resistor to 5V
(Pull down, sourcing inputs) - 10kΩ internal resistor to common
Active/Non-Active input trigger: <1.9V
Non-Active/Active input trigger: >2.3V
Keypad4 keys total, 3 programmable keys
Memory storageNon-volatile EEPROM, 100000 write cycles minimum
Warm up time15 minutes
Power Requirements:
AC Supply85-264VAC, 50/60Hz or 120-370VDC
Isolation: 3000VAC/1min
Low DC Supply10-30VDC input
Reverse and over voltage protected
Isolation: >1000V/1min
High DC Supply25-70VDC input
Reverse and over voltage protected
Isolation: >1000V/1min
Power Consumption<10W (Depending on options selected)
Fuse (built in)2A Slow Blow (Wickmann_3721200000)
RS components part number_226-6599
Operating temperature-10°C to 50°C (14°F to 122°F)
Storage temperature-40°C to 80°C (-40°F to 176°F)
Operating / storage humidity<85% RH non-condensing
Overall Dimensions96 x 48 x 112mm (LxHxD) (3.78 x 1.89 x 4.41”)
(Depth includes connectors)
Mounting92 x 45mm (3.62 x 1.77”) cut-out
Enclosure materialRear ABS, Front polycarbonate
Front facia ratingIP65, with o-ring supplied as standard
Wiring connectionsRemovable terminal blocks
ADC Resolution22 bit Delta-sigma
Input range-20mV to +35mV
Conversion rate12 updates/second
FilterMoving average digital filter with programmable input step detection
Increment size1, 2, 5, 10, 20, 50, 100, 200
Input Impedance>20 MΩ
Linearity<0.01% of full scale
Accuracy0.05% of full scale
Calibration methodFrom the load cell calibration certificate or from using known weights
Load cell connection4 or 6 wire connection + shield (sense included)
Load Cell Excitation:
Excitation VoltageFixed 5V DC (sense included)
Excitation currentMax. 125mA
Up to 4 x 350Ω or 8 x 1000Ω load cells
Cable compensation4 wire Kelvin force sense feedback
Cable compensation resistance<= 10Ω
Analogue Output:(Optional)
Ranges (menu selectable)
DAC Resolution16 Bit
Update rate12 updates/second
Current output compliance500Ω maximum load
(current is source, not sink)
Voltage output compliance1kΩ minimum load
Current open loop detectionDisplay flashes “mA.Loop” error message
Linearity<0.02% of full scale
Accuracy0.05% of full scale
ASCII In (Infiniteq Protocol)
ASCII Out (Infiniteq Protocol)
RS232 (standard)Baud rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
Data bits: 7 or 8 bits
Parity: Odd, Even or None
Stop bits: 1 or 2 stop bits
Non isolated
RS485 (optional)Baud rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
Data bits: 7 or 8 bits
Parity: Odd, Even or None
Stop bits: 1 or 2 stop bits
Internal 120Ω field jumper selectable termination resistor
Max 32 instruments per line
Setpoint Relays:Optional, up to 4 can be fitted
Contact rating2A@240VAC or 30VDC (resistive load)
Isolation to input circuitry>1000Vrms for 1 minute
TypeFORM-C (change over contact, NO / NC)
Life expectancy>100K cycles min. at full load rating. External RC snubber extends relay life for operation with inductive loads
Solid-State (SSR):
Contact rating120mA@400VAC/DC
Isolation to input circuitry>1000Vrms for 1 minute
TypeFORM-A (normally open)
Real Time Clock:(Optional RTC)
AccuracyBetter then 3 seconds per day (temperature dependent)
Order codes and options:

IQ240 for 85-264VAC auxiliary supply
-700   10-30VDC auxiliary supply
-701   25-70VDC auxiliary supply
-710   1 mechanical change-over Form C relay
-711   2 mechanical change-over Form C relays
-712   3 mechanical change-over Form C relays
-713   4 mechanical change-over Form C relays
-720   1 solid-state Form A relay
-721   2 solid-state Form A relays
-722   3 solid-state Form A relays
-723   4 solid-state Form A relays
-730   16 bit analogue output, 0/4-20mA, 0-10V
-731   16 bit isolated analogue output, 0/4-20mA, 0-10V
-740   Second communications RS485 interface
-750   Real time clock
-760   Engineering units legends
-761   Power connector protective cover
-762   115VAC inductive load suppressor
-763   230VAC inductive load suppressor
-764   2A slow-blow panel meter replacement fuse
-765   R-C snubber noise and arc suppressor
-766   Transparent protective front cover

IQ240 6-digit panel mount weighing indicator

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