Loadstar Sensors AI-1000-CV User manual

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User Guide
AI-1000-CV User Guide
Overview
The AI-1000-CV Analog Load Cell Interface is used to capture low level
mV/V signals from a resistive bridge type load cell and convert it into a high
level 0-5 V DC voltage output and/or a 4-20 mA current output compatible
with PLCs and DAQs. It can be used with any resistive load cell. It is similar
to the AI-1000 product which only offers the voltage output. This interface
offers BOTH voltage and current output options.
Features
§ Compatible with all resistive bridge type load cells with mV/V output
§ Powered by 24V DC power supply (provided by user)
§ Input power to load cell can be set (suggested value is 9V)
§ Tunable for easy calibration of your load cell
§ Grommets to protect inlet and outlet
§ Lid with O-Ring to protect enclosure from the elements
§ Two mounting tabs with through holes to fasten unit into your assembly
§ One AI-1000-CV needed per load cell
§ Load Cell must be calibrated with AI-1000-CV prior to use
Product Dimensions
4.5 in x 2.7 in x 1.6 in

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User Guide
Operation
Connecting Load Cell to AI-1000 CV Interface
1. Strip any 4-wire cable on both sides and Tin each wire as we will use this wire for the output.
o It is useful to solder one side of the wire so it is easier to connect the ground cables later
2. Insert the wire for the output through the right hole and insert the wire coming out of the loadcell in
the left hole as shown in the picture below.
o Remove the grommet caps and insert the cables through the caps before inserting it
through the hole to fasten into terminal block

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User Guide
3. Connect the wires as show in the image below
o Note the Load Cell connection is almost always as shown except in special cases such as
RRP1. In such a case please refer to the loadcell wiring for the correct colors.
4. Switch the number 2 switch to the on position.
o # 1 Switch – Turn on if you wish the Output to be 0-10 V. By default it is in the 0 -5 V range.
o # 2 Switch On allows the zero level to be adjusted with more resolution. Keep it On.

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User Guide
Measuring Current and Voltage from the Interface
1. Use the power supply to provide
24 Volts exactly
2. Connect the red output from the power supply to the red wire on the output cable, connect the
black output to the soldered black wires on the output cable
3. To measure
voltage
, connect the
Input V
on the multimeter to the
green
wire from the output cable
o Make sure the Multimeter is set to measure voltage by pressing
DC V
4. To measure
current
, connect the
Input I
(fused) on the multimeter to the
white
wire from the output
cable
o Make sure the Multimeter is set to measure current by pressing
DC I (Shift + DC V)

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User Guide
Calibrate your Load Cell with the AI-1000-CV
You must calibrate your sensor with the AI-1000-CV:
o Adjust RVIN to set the excitation voltage to 9 V DC
o Adjust RVOand/or RIO to set the initial voltage/current level without any load or zero load
o Adjust RVS and/or RIS to max voltage (4.5 V) or max current (20 mA) when full load is applied
o Adjust the RVOand RVS or the RIOand RISiteratively until the output meets your target
outputs
Once calibrated you MUST use the same AI-1000-CV with the same load cell to ensure the
accuracy of the signal.

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User Guide
To avoid damaging the potentiometers, please be gentle with the potentiometers (“Pots”) turns
and don’t overdo it. If changing the Pots does not change the output voltage as expected, then
make sure to check your load cell independently of the AI-1000-CV and then try again.