LaMotte Tracer Total Chlorine Meter - Manual (Page 11)

3. Pipet exactly 1.00 mL of the 100 ppm solution into a third 100 mL
volumetric flask. Dilute to the 100 mL line with deionized water. Cap
and mix. This standard is 1 ppm.
4. Add 5 TRACER TCl Tablets (7044A) to the flask of 1 ppm standard
from Step 3. Cap and mix until the tablets disintegrate. The tablets
contain a small amount of insoluble material and will not dissolve
completely. This standard is 1 ppm Converted Chlorine.
Procedure
1. Mix the 1 ppm Converted Chlorine standard.
2. Fill a sample cup with 20 ml of newly prepared 1 ppm Converted
Chlorine standard. Tightly cap the standard immediately after use.
3. Turn the TRACER on. Wait 3 seconds for auto-calibration (circuit’s
not electrode). Immediately immerse in the standard.
4. Stir the standard with the TRACER for 10 seconds. Stop stirring. The
standard and the TRACER must remain still and stable during
measurement.
5. The display will flash while readings are changing rapidly. The result
should be read when the display stabilizes. The reading will be held
and the HOLD annunciator will come on after 120 seconds.
6. Remove the TRACER from the standard. Rinse in deionized water
and shake dry.
7. Repeat steps 2 - 6 three more times on the same sample cup of
standard.
8. After the fourth time, press and hold the CAL key. While continuing
to hold the CAL key, press the MODE key. Immediately release both
keys. The main display should flash
1.00
.
If
1.00
is not displayed, keep the electrode in standard and press the
CAL key again until
CAL
is displayed, then press the CAL and MODE
keys again simultaneously. Immediately release both keys.
9. After approximately 5 to 7 seconds the display will briefly flash
END
.
Rinse the TRACER in deionized water and shake dry.
Notes
1. The 1 ppm Converted Chlorine standard should be at room
temperature (23
±2°C) during the validation procedure.
2. The 10,000 ppm Standard Solution can be stored for up to one year in
a tightly sealed, amber, glass bottle.
3. The 10 ppm Standard Solution can be stored for up thirty days in a
tightly sealed, amber, glass bottle.
4. The 1 ppm Converted Chlorine Standard is stable for up to
approximately 30 minutes. Discard the standard after use.
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