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C HAPTER 6 ______________________________________________ CALIBRATION AND ADJUSTMENT
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Connect an ammeter/voltmeter to the analogue outputs (connector
X2). Give command ¡¡l¡ . At the first calibration point the
LED on the left flashes; adjust the first point (offset) with the arrow switches to the same reading with the reference and press
ENT switch.
•
After adjusting the offset point and pressing ENT the second LED from left flashes. Press ENT without changing the output value.
Two-point temperature calibration and adjustement
Using serial commands
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Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap prior to calibration.
Disconnect the security lock jumper before turning the transmitter on!
•
Check the transmitter against the reference.
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Give command CT <cr>, enter the first point value and press <cr>:
>CT <cr>
T : xx.x Ref1 ? yy.y <cr>
Press any key when ready
•
If you want to see how the sensor stabilizes to the reference temperature, enter c <cr> instead of the first reference:
T : 0.90 Ref1 ? c <cr>
T : 0.55 Ref1 ? c <cr>
T : 0.55 Ref1 ? 0.0 <cr>
Press any key when ready...
•
Change the temperature and again check the transmitter against the reference.
•
Check that the reading corresponds with the reading of the reference instrument. If not, adjust the second point.
•
Press any key, enter the second point value and press <cr>.
T : xx.x Ref2 ? yy.y <cr>
V AISALA _________________________________________________________________________ 61
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