USER MANUAL
MI 404
Free & Total Chlorine
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.
Range 0.00 to 5.00 mg/L Cl
2
Resolution 0.01 mg/L (0.00-3.50 mg/L);
0.10 mg/L (above 3.50 mg/L)
Precision ±0.04 mg/L @ 1.50 mg/L
Light Source Tungsten lamp
Light Detector Silicon Photocell and 525 nm
narrow band interference filter
Method Adaptation of the USEPA
method 330.5 and Standard
Method 4500-Cl G.
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
SPECIFICATIONS:
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
unreacted 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 dis-
play will show “-0.0-”. The
meter is now zeroed and
ready for measurement.
9• Immediately reinsert the cuvet into the
holder and ensure that the notch on the
cap is positioned securely into the groove.
10• Press READ and “SIP” will blink during
measurement.
11• The instrument directly displays concentra-
tion in mg/L of free chlorine.
12• Then, for total chlorine measurement, re-
move the cuvet and add to the reacted
sample 3 drops of DPD 3. Replace the cap
and swirl gently.
13• Reinsert the cuvet into the holder and en-
sure that the notch on the cap is posi-
tioned securely into the groove.
14• Wait for 2 minutes and
30 seconds then press
READ and “SIP” will
blink during measure-
ment.
15• The instrument directly displays concentra-
tion in mg/L of total chlorine.
Interferences
• Bromine (positive error)
• Chlorine dioxide (positive error)
• Iodine (positive error)
• Oxidized Manganese (positive error)
• Chromium (positive error)
• Ozone (positive error)
7• Remove the cuvet.
8• For free chlorine measurement: add 3
drops of DPD 1 indicator and 3 drops of
DPD 2 buffer to an empty cuvet.
Immediately add 10 mL of unreacted sample.
Replace the cap and swirl gently.
ISTMI404 03/05
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