User Guide

37
• FOR HI 8931
When the reading stabilizes, turn the SLOPE trimmer on the front
of the HI8931 until the LCD reading is the same as the calibration
solution at 25°C (77°F), i.e.
"80.0 mS" using HI7034 with HI8931A
"12.88 mS" using HI7030 with HI8931B
"1413 µS" using HI7031 with HI 8931C
"84.0 µS" using HI7033 with HI8931D
• The calibration is now complete and the instrument is ready for
use. All subsequent measurements will now be compensated to
25°C (77°F).
• If the instrument will not calibrate refer to the Probe Maintenance
and Cleaning section (see page 46).
• If the HI8936 transmitter is not used in conjunction with the
HI8931 controller, connect the transmitter to an external power
supply (see page 19). Connect the transmitter to the HI7638
conductivity probe (see page 23) and to an ammeter (see page
19).
The calibration of the transmitters with LCD (HI8936AL, HI 8936BL,
HI8936CL, HI 8936DL) does not require any ammeter.
Follow the above calibration procedure performing the operations
referred to the HI8936 transmitter only.