13
1Plug in the 41 °C calibration probe.
2Gain access to the adjustment potentiometers VR4 and VR5, by removing the control board from the humidifier front panel.
3With the Chamber Temp button held down turn on the power switch. Display should show
4Using the Chamber Temp button step through to number
5Starting with a vertical bar display adjust VR4 so the display changes to an all 8 display. If VR4 is rotated too far the display becomes all horizontal bars (... thru 8.8.8. to ===). The correct point is where all the segments of the all 8 display are of equal brightness.
6Using the Chamber Temp button step to number
7Remove the 41 °C calibration probe.
8Adjust VR5 for a display reading of zero. (0)
(This value may drift over time. A deviation of up to ± 2.0 will not affect circuit performance.)
9Calibration is complete; do performance check (§ 6.0)
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
