Rice Lake SCT-30 - Manual (Page 13)

Calibration 9
2.0 Calibration
Before carrying out the instrument real calibration, the type of analog output must be
selected and the tare weight zero setting must be performed.
2.1 Real Calibration (With Sample Weights)
1. Load a sample weight (at least 50% of the full scale value) onto the weighing
system.
2. Set the three-way selector switch to FS CAL. The yellow LED will light.
If the display reads BLOCK, zero setting is not enabled.
3. The display shows the load cell reading in mV and the corresponding
flashing value of the analog output. Adjust the analog output value by
turning the control knob.
4. Hold the control knob down until the display reads FS CAL .
5. Release the knob control and set the selector switch back to NORMAL.
Calibration can also be obtained by referring to the values read by
devices connected to the instrument, such as the PC or PLC.
Example:
The weighing system uses four 1000 kg cells, the 4-20mA analog output has been
selected and you wish to have 20 mA at 2000 kg. Check that the system is not
loaded; perform the tare weight zero setting and load a sample weight of 1000 kg
onto the system (equal to 50% of the required full scale value); move the selector
switch to FS CAL and set the analog output value to 12 mA by working the knob
control (range: 20 – 4 = 16 mA; ½ of the range: 16 / 2 = 8 mA; ½ of full scale: 8 + 4 =
12 mA); hold down the knob control until the display reads FS CAL
; release the
knob control and set the selector switch back to NORMAL.
With this type of calibration it is possible to set the analog output value corresponding
to a given value in mV read by the cell.
Note
Note