Chlorine-Total
Range: 0-5.00mg/l (ppm) Cl
2
Colour change: Purple/Red from Free Chlorine
Test increases in intensity
Carry out this test on the solution
remaining from the Free Chlorine test.
1
Add one DPD 3 tablet, crush and mix to dissolve.
2 Stand for two minutes to
allow full colour development.
3 Take photometer reading after
two minutes have elapsed.
Note: To obtain Combined Chlorine residual
subtract Free Chlorine result from Total Chlorine result:
Combined Chlorine =
Total Chlorine - Free Chlorine
Nitrate
Range: 0-20mg/l (ppm) N
Colour change: Colourless - Red
1 Take a clean Nitratest Tube (PT 526). Using the
Measuring Syringe (PT 361) add 1ml of sample.
Fill the Nitratest Tube to the 20ml mark with
deionised water.
2 Add one level spoonful of Nitratest Powder and
one Nitratest tablet. Do not crush the tablet.
Replace screw cap and shake tube well for exactly
one minute then allow contents to settle.
3
Then, either: Invert tube gently 2 or 3 times and
then allow to stand for at least two minutes to
ensure complete settlement. Remove screw cap and
wipe around top with a clean tissue. Decant clear
solution into test cuvette, filling to the 10ml mark.
or: Using the Palintest Filtration Set (PT 600) filter
a portion of the solution through a GF/B filter
paper into a test cuvette filling to the 10ml mark.
4
Add one Nitricol tablet, crush and mix to dissolve.
5 Stand for 10 minutes.
6 Take photometer reading.
Nitrite
Range: 0-0.5mg/l (ppm) N
Colour change: Colourless - Red
1 Fill test cuvette with sample to the 10ml mark.
2
Add one Nitricol tablet, crush and mix to dissolve.
3 Stand for 10 minutes.
4 Take photometer reading.
Ammonia
Range: 0-1.00mg/l (ppm) N
Colour change: Yellow - Green
1 Fill test cuvette with sample to the 10ml mark.
2 Add one Ammonia No 1 tablet and one
Ammonia No 2 tablet, crush and mix to dissolve.
3 Stand for 10 minutes.
4 Take photometer reading.
3.7 Calibration/Validation
Your Photometer 7500 Bluetooth is delivered with
a calibration certificate validating the performance
of the instrument as it leaves Palintest.
We recommend annual service and calibration
of all photometric instruments in normal use.
The Photometer 7500 Bluetooth also includes an
automatic routine to validate analytical performance
using certified Palintest Check Standards. Accessed
via the Mode menu, the Check Standard Mode
provides a field method of ensuring your instrument
is operating within defined specifications and also
a troubleshooting method for unexpected results.
Every Palintest Check Standards set is supplied with
certified values expressed as %T (Transmission), derived
from traceable reference materials. Acceptable tolerances
are defined on the certificate and are automatically
specified within the Photometer 7500 Bluetooth.
Check Standard Mode
Access Check Standard Mode from the Mode screen.
Highlight Check Standard Mode and press OK.
23
3
Photometer 7500 BT
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