Vaisala HMP230 - Manual (Page 68)

HMP230 SERIES
User's Guide
M210225en-B
62
7.2.2. Two point temperature calibration
7.2.2.1. With serial commands
• 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!
• Check the transmitter against the lower reference.
• 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 check the transmitter against the higher
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>
• The stabilization of the sensor can be monitored by entering c <cr>
instead of the reference value.
7.2.2.2. With display/keypad commands
• 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!
• Check the transmitter against the lower reference.
• Select Cali in the main menu and then T cal; select two-point
calibration T 2 point cal. Change the first point reading with the
arrow keys and press ENT.
• Change the temperature and check the transmitter against the higher
reference.