Measurement Procedure
1. Press the ON/OFF button to turn the checker on.
All segments will be displayed for a few seconds,
followed by “Add”
,
“C.1” with “Press” blinking.
2. Preparing the cuvette for “C.1” measurements:
• Use the pipette to fill the cuvette with 10 mL of
unreacted sample.
• Hold the
HI784A-0
Reagent A dropper bottle
vertically and add 14 drops to the cuvette.
Note:
For best results, tap the dropper on a hard surface
and clean the outside of the tip prior to use.
• Using scissors, open one packet of
HI784B-0
Reagent B along the dotted line. Push the two corners
together to make a spout. Add the content of the
packet to the cuvette.
• Screw the cap onto the cuvette and invert for
30-45 seconds to mix. Do NOT shake vigorously –
this will cause more air bubbles!
For the most accurate reading, ensure all reagent is
dissolved and there are no visible bubbles. Ensure the
outside of the cuvette is dry and clean.
• Let the cuvette stand for 30 seconds. This allows
complete dissipation of micro-bubbles.
• Insert the cuvette into the checker and close the cap.
• Press the ON/OFF button. When the display shows
“Add”, “C.2” with “Press” blinking, the checker is
zeroed. Remove the cuvette.
3. Preparing the cuvette for “C.2” measurements:
• Unscrew the cuvette cap. Hold the
HI784C-0
Reagent C dropper bottle vertically and add 12 drops
to the cuvette.
• Replace the cap and invert the cuvette 5 times to mix.
• Insert the cuvette into the checker and close the cap.
B
10mL
10mL
C.1
8:.8.8
10mL
10mL
10mL
10mL
10mL
10mL
C.2
10mL
10mL
10mL
10mL
10mL
10mL
10mL
10mL
Dear Customer,
Thank you for choosing a Hanna Instruments
®
product. Please read this
instruction manual carefully before using the Checker
®
HC handheld
colorimeter. For more information about Hanna Instruments and our
products, visit www.hannainst.com or e-mail us at [email protected].
For technical support, contact your local Hanna Instruments office or e-mail
us at [email protected].
Preliminary Examination
Remove the Checker
HC handheld colorimeter and accessories from the packing
material and examine it carefully. If you require any further information, please
contact Hanna Instruments technical support team.
Each
HI784
is delivered in a case with custom insert and is supplied with:
• Marine Ammonia reagent starter kit (reagents for 10 tests)
• Sample cuvette and cap (2 pcs.)
• Plastic refilling pipette (1 pc.)
• 1.5V AAA Alkaline battery (1 pc.)
• Instruction manual
• Quick-reference guide
Note:
Save all packing material until you are sure that the Checker
HC handheld
colorimeter works correctly. Any damaged or defective item must be returned in its
original packing material with the supplied accessories.
General Description & Intended Use
HI784
Marine Ammonia handheld checker is designed to determine the
concentration of ammonia in saltwater aquariums.
HI784
features a single-button operation system and is easy to use.
The large LCD is easy to read and the auto shut-off feature assures the battery
will not be drained.
Specifications
Range
0.00 to 2.50 ppm (mg/L) NH
3
Resolution
0.01 ppm (mg/L)
Accuracy
±0.05 ppm ±5% of reading @ 25 °C (77 °F)
Light source
Light Emitting Diode @ 610 nm
Light detector
Silicon photocell
Method
Adaptation of the Salicylate Method. The reaction between
Ammonia and Ammonium and the reagent causes a
blue-green tint in the sample.
Environment
0 to 50 °C (32 to 122 °F); max. 95% RH non-condensing
Prepared sample cuvette (sample plus reagents) must be
18 to 29 °C (65 to 85 °F)*.
Battery type
1.5V AAA Alkaline
Auto shut-off
After 10 minutes of non-use
Dimensions
86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)
Weight
64 g (2.3 oz)
* Warm or cool prepared cuvettes if needed.
Functional Description & LCD Display
Cap
Cuvette with cap
Cuvette holder
LCD (Liquid Crystal Display)
ON/OFF button
Ammonia
ppm NH
3
/NH
4
+
• Press and hold the ON/OFF button. The display will show the countdown prior
to the measurement. Alternatively, wait 15 minutes and press the button once
to measure.
0:15
1.05
Note:
For samples with less than 1.00 ppm, the reaction is complete after 10
minutes. Users may press the ON/OFF button at this time, with 5 minutes
remaining on the timer.
• When the timer ends, the checker will perform the reading. The instrument
displays the ammonia/ammonium concentration in ppm NH
3
. The checker
automatically turns off 10 minutes after reading.
• To calculate the unionized ammonia (NH
3
) concentration, use the conversion
table on the reverse side.
Errors & Warnings
The checker shows clear warning messages when erroneous conditions appear and
when measured values are outside the expected range. The information below
provides an explanation of the errors and warnings, and the recommended action
to be taken.
Light High:
There is an excess amount of ambient light
reaching the detector. Please check preparation of zero cuvette.
Light Low:
There is not enough light to perform a
measurement. Please check the preparation of the zero cuvette.
Under Range:
Minimum concentration value displayed
blinking indicates the measured value is outside the limits of the
method. Verify that the sample does not contain any debris, and
the preparation of the sample cuvette.
Over Range:
Maximum concentration value displayed blinking
indicates the measured value is outside the limits of the method.
Verify the preparation of the sample cuvette. Dilute the sample
and repeat the measurement.
Battery Low:
Battery level is too low for the checker to function
properly. Replace the battery with a new one.
Drained Battery:
The battery is drained and
must be replaced. Replace the battery with
a new one and restart the checker.
L.Hi
L.Lo
0.00
2.50
bAt
bAd bAt
