YSI 6 series User Manual page 50

Sondes
The next calibration instructions are only for the ISE sensors which are options for the 6820V2-1,
6800V2-2, 6600V2-2, 6920V2-1, and 6920V2-2 sondes. If you do not have one of these sondes, you
may skip to the next section.
+
AMMONIUM (NH ) , CHLORIDE CL
4
WARNING: AMMONIUM AND NITRATE SENSORS CAN ONLY BE USED AT DEPTHS OF LESS
THAN 50 FEET (15 METERS). USE OF THE SENSORS AT GREATER DEPTHS IS LIKELY TO
PERMANENTLY DAMAGE THE SENSOR MEMBRANE.
The calibration procedures for ammonium, nitrate or chloride are similar to pH except for the reagents in
the calibration solutions. Suggested values for calibrants are 1 and 100 mg/L of either ammonium-nitrogen
(NH -N) or nitrate-nitrogen (NO
4
-
(Cl ).
NOTE: The following procedure requires one portion of the high concentration calibrant and two portions
of the low concentration calibrant. The high concentration solution and one of the low concentration
solutions should be at ambient temperature. The other low concentration solution should be chilled to less
than 10C prior to beginning the procedure.
Place the proper amount of 100 mg/L standard (1000mg/l for chloride) into a clean, dry or pre-rinsed
transport cup. Carefully immerse the probe end of the sonde into the solution. Allow at least 1 minute for
temperature equilibration before proceeding.
Select Ammonium, Nitrate, or Chloride to access the appropriate calibration choices. Then select 3-3-
Point. Press Enter and input the concentration value of the standard as requested. Press Enter and the
current values of all enabled sensors will appear on the screen and will change with time as they stabilize in
the solution. Observe the readings under NH4
approximately 30 seconds, press Enter.
After the first calibration point is complete, proceed as instructed on the screen, to continue. Rinse the
sonde in water and dry the sonde prior to the next step.
Place the proper amount of 1 mg/L standard for Ammonium or Nitrate (10 mg/l for Chloride) into a clean,
dry or pre-rinsed transport cup. Carefully immerse the probe end of the sonde into the solution. Allow at
least 1 minute for temperature equilibration before proceeding.
Press Enter and input the concentration value of the standard as requested.
Press Enter and the current values of all enabled sensors will appear on the screen and will change with
time as they stabilize in the solution. Observe the readings under NH4
show no significant change for approximately 30 seconds, press Enter.
After the second value calibration is complete, press Enter to continue. Place the proper amount of chilled
1 mg/L standard (10 mg/L for the chloride) into a clean, dry or pre-rinsed calibration cup. Carefully
immerse the probe end of the sonde into the solution. Allow at least 5 minutes for temperature
equilibration before proceeding.
Press Enter and input the concentration value of the standard as requested. Press Enter and the current
values of all enabled sensors will appear on the screen and will change with time as they stabilize in the
solution. Observe the readings under NH4
approximately 30 seconds, press Enter. After the third value calibration is complete, press Enter to return
to the Calibrate menu.
Thoroughly rinse and dry the calibration cups for future use.
YSI Incorporated Environmental Monitoring Systems Operations Manual
-
AND NITRATE (NO
-N). Suggested values for calibrants are 10 and 1000 mg/L of Chloride
3
+ -
, NO3 , or Cl
+ -. -.
, NO3 or Cl and when they show no significant change for
-
) 3-POINT
3
-
. When they show no significant change for
+ - -
, NO3 , or Cl .and when they have
Section 2
2-44