Martini Instruments MI 405 User Manual

USER MANUAL
MI 405
Ammonia Medium
Range Meter
Dear Customer,
Thank you for choosing a Martini product. This
manual will provide you with the necessary infor-
mation for the correct use of the instrument.
Please read it carefully before using the meter.
This instrument is in compliance with directives.

SPECIFICATIONS:

-
Range 0.00 to 9.99 mg/L (NH N)
3
Resolution 0.01 mg/L
Precision ±0.10 mg/L @ 5.00 mg/L
Light Source Blue LED 466 nm
Light Detector Silicon Photocell and 466 nm
narrow band interference filter
Method Adaptation of Nessler method
Environment 0 to 50°C (32 to 122°F);
100% RH max.
Battery Type 1 x 9 volt
Auto-Shut off After 10' of non-use
Dimensions 192 x 104 x 52 mm
(7.5 x 4.1 x 2")
Weight 380 g
ISTMI405 03/05

MEASUREMENT PROCEDURE:

1• Turn the meter on by pressing ON/OFF.
2• When the LCD displays "- - -",
the meter is ready.
3• Fill the cuvet with 10 mL of
sample, up to the mark, and
replace the cap.
4• Place the cuvet into the holder
and ensure that the notch on
the cap is positioned securely
into the groove.
5• Press ZERO and "SIP" will blink
on the display.
6• After a few seconds the
display will show "-0.0-". The
meter is now zeroed and ready
for measurement.
7• Remove the cuvet. Open it.
8• Add 4 drops of NH -1 (10 drops in case of
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seawater analysis) and swirl gently.
9• Add 4 drops of NH -2 (10 drops in case of
3
seawater analysis). Replace the cap and
swirl gently.
10• Immediately reinsert the cuvet
into the holder and ensure that
the notch on the cap is posi-
tioned securely into the groove.
11• Press and hold READ for 3
seconds and the display will
show the countdown prior to
the measurement.
Alternatively, wait for 3 minutes
and 30 seconds and just press
READ. In both cases "SIP" will
blink during measurement.
12• The instrument directly displays the concen-
tration in mg/L of ammonia nitrogen (NH -N).
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13• To convert the reading to mg/L of ammonia
(NH ), multiply by a factor of 1.216.
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Interferences

• Organic compounds like: chloramines, vari-
ous aliphatic and aromatic amines, glycine,
(positive error).
To eliminate these interferences distillation
is required.
• Organic compounds like: aldehydes, alcohols
(e.g. ethanol) or acetone (negative error).
To eliminate these interferences distillation
is required.
2-
• Sulfide (S ): may cause turbidity.
• Hardness above 1 g/L as Calcium Carbonate
(CaCO ).
3