Hanna Instruments HI931, User Manual, Page: 194 / 218

24
TROUBLESHOO
TING 2
TROUBLESHOOTING 2
METHOD ID: HI1012EN
ALTERNATIVE CALCULATIONS
If the actual values of the above parameters are not accessible the
following equation can be used:
V=M*F
V Volume of measured mass of water (mL)
F Transformation factor
The transformation factor takes into account the air buoyancy, the
water density and temperature dependence. Standard values can be
used to obtain the transformation factor.
The values from the table below have been calculated by correcting
the air and water density with temperature, assuming the density of
dry air
ρ
air
= 0.0012 g/mL and density of calibration steel standard
weigh
ρ
STD
= 8 g/mL.
Temperature ( °C) Factor
17.0 1.002290
18.0 1.002467
19.0 1.002654
20.0 1.002853
21.0 1.003061
22.0 1.003282
23.0 1.003512
24.0 1.003752
25.0 1.004002
26.0 1.004261
27.0 1.004531
28.0 1.004809
29.0 1.005097
30.0 1.005395
STIRRING SPEED FAST CHECK PROCEDURE
• On the main screen select , if necessary select the
analog board and press .
• Press and use the arrow keys to highlight
Stirrer
Configuration
. Use the arrow keys to highlight
Stirrer 1
. Press
.
• Use the arrow keys to highlight Strring Speed . Use the numeric
keypad to enter 200 rpms then press .
• Press to exit the mV Setup screen.
• From the main screen, press , use the up arrow key to
increase the stir speed slowly to 2500 rpms.
• Check that the propeller continues to increase speed, following
the commands.
• This procedure can be repeated on stirrer 2.