Application of DSCD-910 benchtop spectrophotometer in Gardner Chromaticity Measurement

DSCD-910 benchtop spectrophotometer(Transmittance) is a high-performance spectrophotometer specially designed for measuring liquid transmittance, absorbance, concentration, chroma and other parameters. In addition to measuring liquid transmittance, the instrument also includes APHA / PtcO (APHA / platinum cobalt) and Gardner (Gardner index) chromaticity scales used for resin, solvent, acid, perfume, varnish and other products; Saybolt chromaticity scale for measuring gasoline, white oil, kerosene, lubricating oil and paraffin oil. The instrument can fully meet the requirements of detergent Lab value and color difference measurement.

The instrument adopts the geometry of D/0, integration of the full band LED composite light source, double beam optical system, ETC every-test calibration technology, which makes the instrument reaches a resolution of 0.0001, deviation of the transmittance within 0.08% and chromatic value △E*ab 0.015.

Gardner chroma is widely used in petroleum, printing and chemical fields, such as determination of transparent liquids such as resin, varnish, paint, dry hot oil, fatty acid, lecithin, sunflower seed oil and flaxseed oil.

Gardner Color Scale is a dimension to measure the depth of yellow. Gardner color standard is divided into 18 grades according to the chroma of standard filter from 1 (light) to 18 (deep). The larger the number, the darker the color. The internationally used chromaticity is an even number grade of 2-16.

Defect of standard solution colorimetry:
1、 The preparation process of Gardner standard solution is complicated
First, pipette potassium chloroplatinate solution into eight 25mL volumetric flasks with the amount shown in the table in Figure 2, and dilute them to the scale with dilute hydrochloric acid solution. The solution prepared is Gardner color code No. 1-8.

Use a pipette to transfer cobalt chloride solution and ferric chloride solution into 10 100 mL volumetric flasks as shown in Table 1 (continued) of Figure 3, and dilute them to the scale with dilute hydrochloric acid solution. The solution prepared is Gardner color code No. 9-18.

2、 Difficulty in storage
Gardner color scale prepared according to the Standard for Determination of Color of Transparent Liquids (Gardner Colorimetry) shall be stored in a dark place and sealed. The reference solution shall be checked at least once every six months. If the color is different from the corresponding potassium dichromate sulfuric acid reference solution, it shall be re prepared.
With the passage of storage time and the influence of external environment such as temperature and light, the chromaticity value of standard solution may change, which will affect the accuracy of colorimetry.

3、 Limitations of human eye color measurement
Color is a visual effect produced by light stimulation to the human eye. The perception of color by the human eye cannot be quantified, and will be affected by light source, observation angle, object size, background, object shape and other factors. Therefore, color measurement by the human eye is limited.
The spectrophotometer measures accurately.

LISUN technology is the leader in the field of color measurement. LISUN DSCD-910 benchtop spectrophotometer (transmittance) is a high-performance spectrometer specially designed for measuring liquid transmittance, absorbance, concentration, chroma and other parameters. DSCD-910 desktop colorimeter/meter can accurately measure the chromaticity value of Gardner standard solution.
DSCD-910 benchtop spectrophotometer (transmittance) stores 18 Gardner standard solution parameters into the instrument, which can easily complete the color comparison task and solve the limitations of human eye color measurement.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

Please feel free to contact us if you need any support.
Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618117273997

Tags：DSCD-910