User manual

Toolbox 32 User Manual 1.47d www.cse-semaphore.com/mykingfisher
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225
The IO-4 is to be calibrated for a strain gauge input used to measure the water level in a tank. The tank has
a depth of 5m. Note: it is more accurate if the strain gauge is calibrated when the tank is full.
• Select the Reset Calibration button.
• Select the Enable Calibrate button.
• For the first input, lift the strain gauge out of the water (this will probably produce a voltage of about 1mV
into the IO-4).
• Enter 0% (corresponding to an empty tank) in the box above the Accept Perc 1 button and then select
Accept Perc 1.
• Put the strain gauge back into the water to a known depth of say 2m (this may produce a voltage of say
11mV into the IO-4. The actual voltage will depend on the calibration of the strain gauge). If the tank is
full then put the strain gauge all the way into the tank.
• Enter 40% (corresponding to 40% of 5m = 2m or enter 100% if the tank is full) in the box above the
Accept Perc 2 button and then select Accept Perc 2.
• Select the Send Calibration button. The IO-4 module is now calibrated.
IO-4 Module V1.2
The original IO-4 module (version 1.2) allows channel 1 to be calibrated using fixed percentage setpoints of
0% and 100%. The hardware overview for an IO-4 module, version 1.2 is shown below
Figure: Hardware Overview For The IO-4 Module V1.2
Calibration Method:
• Select the Reset Ch.01 button. This will clear the calibration registers in the IO-4 module.
• Select the Enable Ch.01 button. This tells the RTU that channel 1 is about to be calibrated.
• Apply the first voltage input corresponding to 0% to channel 1 (0-50mV).
• Select Set Ch.01 Min.
• Apply the second voltage input corresponding to 100% to channel 1 (0-50mV).
• Select Set Ch.01 Max. The IO-4 is now calibrated.