19
18
Note
:
Absorbance readings may have a negative sign if the
transmittance of the “
ZERO
” sample is less then that of the
reacted sample.
Note
: For better accuracy wash glassware with HCl 6N.
Measurements in user-customized mode
Note
:
The meter must be calibrated for this purpose. Follow the
two-point customized calibration on page 26 before proceeding.
Turn the meter on and by momentarily pressing both
ALT
and
CAL
.
The LCD will show four dashes on
the upper and “
d 00
” on the lower
part of the LCD with the second “
0
”
flashing:
Using the , and
keys change
the lower row of the display to
show “
d 11
”:
Press the
key. This key is also used as a toggle between
USER
(USR) and
FACTORY
(FCT) programmed functions. Select the USER
mode (if necessary by pressing the
key more than once):
Press
ALT
and
CAL
until four dashes are displayed on the upper
display and “
# fn
” are shown in the lower part of the LCD.
Using the and keys select the number from 0 to 7 where the
appropriate calibration data have been stored.
+
12
3
6
9
30"
1.5 cm
Add the content of one packet of
HI 93746
TPTZ reagent, close the
cylinder and agitate for 30 seconds.
Fill a cuvette with 10 mL of the reacted
sample up to 1.5 cm (
3
/
4
") below the rim
and replace the cap. This is the sample.
Insert the reacted sample into the cuvette holder and make sure that
the notch on the cap is positioned securely into the groove. Wait 30”
and then press
READ
.
The meter will show “
SIP
” for about a few seconds and then the
concentration:
Note
:::::
To review the relative absorbance of the sample, wait until
the concentration measurement is completed, and then
press
GLP/Abs
. The display will show the absorbance in
milliunits together with the “
Ab
” indicator, e.g.:
533 Ab = 533 milliabs. units
