The HI96770 portable photometer is for the high range measurement of silica. Hanna's portable photometers feature an advanced optical system; the combination of a special tungsten lamp, a narrow band interference filter, and silicon photodetector ensure accurate photometric readings every time. The Hanna exclusive CAL Check™ feature utilizes ready-made, NIST traceable standards to verify both meter validation and calibration. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position every time to maintain a consistent path length.
CAL Check™ - Allows for performance verification and calibration of the meter using NIST traceable standards.
GLP - Review of the last calibration date
Auto-shut off - Automatic shut off after 10 minutes of non-use when the meter is in measurement mode. Prevents wastage of batteries in the event the meter is accidentally not turned off.
Battery status indicator - Indicates the amount of battery life left.
Built in timer - Display of time remaining before a measurement is taken. Ensures that all readings are taken at the appropriate reaction intervals for the test being performed.
Error messages - Messages on display alerting to problems including no cap, high zero, and standard to low.
Cooling Lamp Indicator - To maintain the desirable wavelength to be used for absorbance it is necessary to ensure component are not overheated from the heat generated by the tungsten lamp. Each photometer is designed to allow a minimal amount of time for components to cool. The cooling lamp indicator is displayed prior to a reading being taken.
Units of measure - Appropriate unit of measure is displayed along with reading.
Silica is found in all natural waters in the dissolved mineral form. Silica is only slightly soluble in water and can be found as ionic silica, silicates, or colloidal or suspended particles. The solubility of silica is highly dependent on pH, temperature, and pressure, and in unfavorable conditions forms deposits or scale. Silica’s presence in industrial applications, particularly high pressure turbines, is undesirable because of the scaling caused by the elevated temperature and pressure. Heating systems and reverse osmosis plants also require monitoring of silica to ensure process efficiency.
The HI96770 uses an adaptation of the USEPA Method 370.1 and Standard Method 4500SiO2 C to measure silica concentrations of less than 200 mg/L (ppm). When the reagent is added to samples containing silica, the sample will turn a yellow hue; the greater the concentration, the deeper the color. The associated color change is then colorimetrically analyzed according to the Beer-Lambert Law. This principle states that light is absorbed by a complementary color, and the emitted radiation is dependent upon concentration. For high range silica determination, a narrow band interference filter at 466 nm (blue) allows only blue light to be detected by the silicon photodetector and omits all other visible light emitted from the tungsten lamp. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.
The HI96770 is available as a kit which includes:
- Portable Photometer
- Sample cuvettes (2)
- CAL Check™ standards with certificate
- Cuvette cleaning cloth
- Rugged carrying case
- Carrying case has thermoformed insert for meter and accessories
CAL Check™ standards with certificate
The HI96770-11 CAL Check™standards are used for calibration and performance verification of photometers with the CAL Check function.Supplied with Certificate of Analysis
Provided storage containers
- Lot number
- Expiration date
- Standard value @ 25 °C
- Reference meter NIST traceable
- Light tight
- Protects from accidental breakage
Range 0 to 200 mg/L (ppm) Resolution 1 mg/L (ppm) Accuracy @ 25°C (77°F) ±1 mg/L ±5% of reading Light Source light emitting diode Light Detector silicon photocell with narrow band interference filter @ 466 nm Method adaptation of the USEPA method 370.1 for drinking, surface and saline waters, domestic and industrial wastes, and Standard Method 4500-SiO2 C Auto-off after ten minutes of non-use in measurement mode; after one hour of non-use in calibration mode; with last reading reminder Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing Battery Type 9V battery Dimensions 193 x 104 x 69 mm (7.6 x 4.1 x 2.7”) Weight 360g (12.7oz.) Ordering Information HI96770 is supplied with sample cuvettes (2) with caps, 9V battery, instrument quality certificate and instruction manual.