CheckerHC - Model HI 770 -Handheld Colorimeter - Silica High Range
Silica is the name given to silicon dioxide, SiO2. Silicon, Si, is the most abundant element in the Earth’s crust, 28% of it by weight. Silicon is never found free form in nature. In crystallized form it is only reactive under conditions of extremely high temperatures. Water and water vapor probably have little influence upon silicon solubility, because a protective surface layer of silicon dioxide is rapidly formed. Silicon binds with other elements to form various species of silica and silicate. The concentration of the soluble silica molecules are important to aquaculture because they influence (and limit) the growth of diatoms. In most waters, the predominant form of dissolved silica is monosilicic acid, which incorporates 2 water molecules.
The HANNA HI 770 CheckerHC is accurate and affordable. This portable handheld colorimeter features a resolution of 1 ppm (200 points) and ±2 ppm ±5% of reading accuracy.
The contoured style of the HI 770 CheckerHC fit in your palm and pocket perfectly and the large LCD is easy to read. The auto shut off feature assures the battery life will not be drained if you forget to turn it off.
The HI 770 CheckerHC is simple to use. First, zero the instrument with your water sample. Next, add the reagents in order, respecting all the indications. Last, place the vial into the CheckerHC, press the operational button for about 3 seconds and the display will show the countdown prior to the measurement or, alternatively, wait for 2 minutes after last reagent adding and press operational button. The CheckerHC displays concentration in ppm of Silica as SiO2.
Easier to use and more accurate than chemical test kits
Adaptation of EPA Diazotization method
±2 ppm ±5% of reading accuracy
1 ppm resolution (200 points)
Large, easy to read digits
Auto shut off
Dedicated to a single parameter
Designed to work with HANNA’s powder reagents
Uses 10 mL glass cuvettes
Small size, big convenience
Weighing a mere 64 g (2.25 oz.), the
CheckerHC easily fits into the palm of your hand or pocket
Use for quick and accurate on the spot analysis
Single button operation: zero and measure
Operated by a single AAA battery
Ideal for aquaculture
Range: 0 to 200 ppm
Resolution: 1 ppm
Accuracy @ 20°C: ±2 ppm ±5% of reading
Light Source: LED @ 470 nm
Light Detector: silicon photocell
Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type: 1.5V AAA
Auto-off: after two minutes of non-use
Dimensions: 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)
Weight: 64 g (2.25 oz.)
Method: adaptation of the USEPA METHOD 370.1 for drinking, surface and saline waters, domestic and industrial wastes and Standard Method 4500-SiO2 C