Load Cell Amplifier, Indicator & Transmitter, IQ300
Model IQ300
is a programmable wall-mount precision digital indicator for load cell and strain gauge applications. The 4-line backlit sunlight readable graphic LCD display is quick and easy to set up with plain language menus and 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.
5 or 10 VDC load cell excitation voltage is user selectable 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; 3 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 and RS485 serial communications are 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 IQ300 includes 4 electromechanical relays, 16-bit analogue retransmission and a Real Time Clock.
- High bright 6-digit 20mm LED display
- Backlit 4-line graphic LCD for easy setup and calibration
- 4 or 6 wire load cell / strain gauge input
- Powers up to 6 x 350Ω load cells
- 5V or 10VDC excitation voltage
- High precision 22 bit ratiometric ADC front end circuitry
- -199999 to +999999 display counts
- Easy calibration using known weights or load cell data
- 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)
- 3 Programmable digital inputs (pull up or pull down field jumper selectable)
- 3 Programmable front panel push buttons
- 4 Form-C alarm relay setpoints
- Cage-clamp wire connectors
- 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 IQ300 |
LED display | 6-digit, 20mm (0.8”) 7 segment high brightness red LED |
LCD display | 128 x 64 graphic mono sunlight readable |
Backlight | Yellow / Green with on/off control |
Display range | -199999 to +999999 |
Decimal point | 0 to 0.00000 |
Status LED's | 8 LED's for SP1 to SP4, Zero, Net, Motion & Print |
Digital Inputs | 3 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 | |
Keypad | Full 4 x 3 alphanumeric |
4 Dedicated function keys (Zero, Tare, Print, Gross/Net toggle) | |
3 Dual function keys (Display Toggle, Display Hold & Alarm latch reset) | |
Memory storage | Non-volatile EEPROM, 100000 write cycles minimum |
Warm up time | 15 minutes |
Power Requirements: | |
AC Supply | 85-264VAC, 50/60Hz or 120-370VDC |
Isolation: 3000VAC/1min | |
Low DC Supply | 10-30VDC input |
Reverse and over voltage protected | |
Isolation: >1000V/1min | |
High DC Supply | 25-70VDC input |
Reverse and over voltage protected | |
Isolation: >1000V/1min | |
Power Consumption | <15W |
Fuse (built in) | 2A Slow Blow (Wickmann_3721200000) |
RS components part number_226-6599 | |
Environmental: | |
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 |
Enclosure: | |
Overall Dimensions | 180 x 180 x 60mm (LxHxD) (7.09 x 7.09 x 2.36”) |
(Height includes cable glands) | |
Mounting holes | 159 x 94mm (6.26 x 3.70”) |
Enclosure material | ABS - Flame retardant (UL 94 V-0) |
IP rating | IP65 / NEMA 4 / UL Type 4 |
Connection type | Cage clamp wire connectors |
Input: | |
ADC Resolution | 22 bit Delta-sigma |
Input range | -20mV to +35mV |
Conversion rate | 12 updates/second |
Filter | Moving average digital filter with programmable input step detection |
Increment size | 1, 2, 5, 10, 20, 50, 100, 200 |
Input Impedance | >20 MΩ |
CMRR | >-110dB |
Linearity | <0.01% of full scale |
Accuracy | 0.05% of full scale |
Calibration method | From the load cell calibration certificate or using known weights |
Load cell connection | 4 or 6 wire connection + shield (sense included) |
Load Cell Excitation: | |
Excitation Voltage | Field jumper selectable 5V or 10V (sense included) |
Excitation current | Max. 125mA | Up to 4 x 350Ω or 8 x 1000Ω load cells |
Cable compensation | 4 wire Kelvin force sense feedback |
Cable compensation resistance | <= 10Ω |
Analogue Output: | (menu selectable) |
Ranges | 0-20mA | 4-20mA | 0-10V |
DAC Resolution | 16 Bit |
Update rate | 12 updates/second |
Current output compliance | 500Ω maximum load | (Current is source, not sink) |
Voltage output compliance | 1kΩ minimum load |
Open loop detection | LCD display flashes “mA.Loop” error message |
Linearity | <0.02% of full scale |
Accuracy | 0.05% of full scale |
Communications: | |
Protocol | MODBUS RTU |
MODBUS ASCII | |
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: | |
Electro-mechanical: | (4 relays, standard) |
Contact rating | 2A@240VAC or 30VDC (resistive load) |
Isolation to input circuitry | >1000Vrms for 1 minute |
Type | FORM-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): | (optional, 1, 2, 3 or 4) |
Contact rating | 120mA@400VAC/DC |
Isolation to input circuitry | >1000Vrms for 1 minute |
Type | FORM-A (Normally open) |
Real Time Clock: | |
Battery | CR2032 |
Accuracy | Better then 3 seconds per day (temperature dependent) |
Order codes and options:
IQ300 for 85-264VAC auxiliary supply
-700 10-30VDC auxiliary supply
-701 25-70VDC auxiliary supply
-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
IQ300 6-digit wall-mount weighing indicator

Wall mount load cell indicator functions