48
The corresponding absorbance or percent transmittance values are
displayedsimplybypressing
SHIFT ABS or SHIFT %T, respectively. SHIFT
CONC
restores the concentration display.
Note: Absorbance or percent transmittance measurements can be made without
selecting a method. When the program prompt is displayed, press
SHIFT ABS
,
SHIFT %
, or select
PROGRAM #0
. After establishing the zero reference point
using a blank, absorbance or percent transmittance measurements are displayed.
Note: Clean sample cells help achieve accurate results. Wipe cells free of
smudges and finger prints with a soft cloth or paper towel before inserting into the
cell compartment.6
3.3.5 Alternate Chemical Forms
If other chemical forms for the parameter exist in the software, you may
use the arrow keys to scroll through these alternate forms after the
measurement is displayed. For example, in program #100, mg/L Cr may
also be displayed as mg/L CrO
4
2-
or Na
2
CrO
4
. If there are alternate
forms, a symbol in the procedure manual (see at left) will denote them
after the final reading step.
3.4 Timers
For Hach programs, the timer is started by pressing
SHIFT TIMER.
The display will show (for example):
The timer will automatically start, displaying the remaining time.
When the timer is done, three series of four beeps will sound.
The display will show:
0:00
The manual timer is an additional feature that allows the operator to use
the timer independently from the method timer. A manual timer is always
available, but only one timer may be used at any time. If not currently
using a timer, there are two methods to select the timer:
a) Press
SHIFT TIMER. If the program does not include any stored time
intervals, the display shows:
Forms
Na CrO
CrO
Cr
24
4
2-
6+
nm
+8.8.:8.8.
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
888
* 2:58
Timer 1
nm
+8.8.:8.8.
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
888
*
Timer=MM:SS
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