11
4 Photometry
4.1 Measuring the Concentration
1. Prepare the meter to receive the cell size of choice (See Section 3.2)
2. Turn the meter on by pressing the
ON/OFF
key.
3. Press the
-M-
key until Photometry\Concentration is displayed on the top line of the display. After the first
concentration measurement, the last program used is automatically displayed.
Photometry\Concentration
Photometry\Concentration
#
Select program
with <PROG>
#
Select program
with <PROG>
or with
•
–
15: K1503
NH3-N
13 mm
0.00 - 7.00 mg/l
11.30.13 15:12
11.30.13 15:12
First concentration measurement (#1)
All subsequent concentration Measurements (#2)
NOTE
:
From display #2 above, use the
FORM
key to change the chemical form being reported for the program
displayed and use the
UNITS
key to change the reporting unit. (See Section 1.3).
4. Use the
•
or
–
keys to toggle through the last ten programs used or press the
PROGRAM
key and enter the
desired program number, then press
START/ENTER
.
5. Zero adjustment (zeroing the photometer at all wavelengths) is required each time the meter is turned on,
unless the photometer is docked in a Power LabStation (See Section 1.7). Zero adjustment must employ the
cell size for the test that is being run (See Section 1.6). If zeroing is necessary, the required cell size and the
following message are displayed: “
No valid zero adjustment is available”. The user is prompted to
i
perform the zero adjustment. The prompts are highlighted across the bottom of the display. To proceed to
each next prompt, press
START/ENTER
.
NOTE
:
To perform the zero adjustment for Vacu-vials® Test Kits, use the factory sealed ZERO ampoule supplied with
each kit. For
MDL+
Test Kits, fill a sample cell with distilled water to perform the zero adjustment.
6. In addition to zero adjustment, some programs also require a reagent blank (indicated in the individual kit
instructions):
#
If a blank measurement
has NOT
previously been made (stored) for a program, the menu prompts the
user to measure a blank value. The prompts are highlighted across the bottom of the display. To
proceed to each next prompt, press
START/ENTER
.
#
If a blank measurement
has
previously been made (stored) for a program, the previously stored blank
value will automatically be applied to the new sample measurement unless the user deletes or changes
the blank value. To delete the old blank value or generate a new blank value, press the
CAL/ZERO
key
and follow the choices/prompts.
NOTE
:
When a blank value has been applied to a test result, [BV] is displayed on the screen with the test result.
Photometry\Concentration
0.74
[BV]
mg/l
187: K9903
Zn
13 mm
0.00 - 3.00 mg/l
11.30.13 15:12
7. Insert the clean, dry sample vial or ampoule as prompted and press
START/ENTER
. The test result is
displayed.
NOTE
:
If the measured test result is above the upper limit of the test range, the display will show > XX ppm. However,
immediately above that in a smaller font, the actual test result will be displayed
.
