YSI pHotoFlex Series - Manual (Page 17)

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Note: Before using tYSIhe test with your photometer for the first time, determine the reagent
blank value. To determine the reagent blank value it is not necessary to measure the pH and
temperature.
Step 1: pH and temperature measurement
Step 2: photometric measurement
YSI model no.: NH4-1 TP
Category: RT (reagent test)
Cell: 28 mm
Measuring range: Corresponding to 0.01 - 0.64 mg/l NH
4
or 0.01 - 0.50 mg/l NH
4
-N
Measuring ranges for NH
3
or NH
3
-N depending on pH value and temperature,
Example: 0.002 - 0.092 mg/l NH
3
at pH 8.5 and 25 °C.
Measuring mode, pH &
ORP:
Measure pH value and
temperature immediately
after sampling. Store measured values
with . If neces-
sary, assign an ID for
easier retrieving. Switch to the Photometry
measuring mode and
select program no. 341. When the prompt Assign
pH und temp.
appears,
select and accept the
stored values from the
pH and temperature
measurement.
The meter is ready for
the photometric mea-
surement (step 2).
The measuring range is
shown on the display.
Pipette 10.0 ml of sample
into the empty cell. Add the contents of a
VARIO AMMONIA
Salicylate F10 powder
pack and close the cell
with the screw cap. Allow to react for 3
minutes (reaction time). Add the contents of a
VARIO AMMONIA
Cyanurate F10 powder
pack and close the cell
with the screw cap. Shake the cell vigorously
to dissolve solids.
Allow to react for 15
minutes (reaction time). Insert the cell in the
photometer cell shaft
and start measurement.
3:00
15:00
Notes:
• The measuring range depends largely on the pH and temperature. On
the basis of the pH and temperature measurement, it is individually cal-
culated and displayed for each determination.
• We recommend to determine a new reagent blank value (deionized
water instead of sample) for each test package started. To determine
the reagent blank value it is not necessary to measure the pH and tem-
perature.
• For further notes please refer to the package insert of the test.
Ammonia
Program no.
341
*RN341*