04/08/2026
🧪𝐏𝐨𝐥𝐚𝐫𝐢𝐦𝐞𝐭𝐞𝐫 𝐏𝐫𝐨𝐝𝐮𝐜𝐭 𝐅𝐀𝐐𝐬
Excerpted from our official polarimeter knowledge handbook for lab QC and R&D professionals.
Q: When testing an optical rotation sample, the measured reading is slightly higher than the standard value and results in non-compliance. What are the potential causes?
A: Tare weighing was not performed during sample weighing; the protective sheet and washer of the sample tube were installed backwards; the tube’s end caps were overly tightened; deviation existed in blank measurement.
Q: What are the differences in minimum readout and indication error between model SGW-568A and SGW-533A?
A: SGW-568A: minimum readout 0.0001°, relative error ±0.003°; SGW-533A: minimum readout 0.001°, relative error ±0.004°. Both models have an indication error of ±0.01° at 589 nm.
Q: What solutions can be adopted for dark-colored samples with poor light transmittance that cannot be measured?
A: Dilute the sample, use a shorter sample tube, or switch to a model with high light transmittance.
Q: What requirements should be followed when filling samples into the tube?
A: Move air bubbles in the bulb-type glass tube to the bulb neck; wipe off water droplets on the light-transmitting surfaces with a soft cloth; do not over-tighten the screw cap to avoid mechanical stress that distorts readings; align the marked position and direction each time the tube is inserted.
Q: What core structural upgrades does SGW-531/532 have compared with SGW-1/2, and what operational advantages do these upgrades bring?
A: High-precision encoders replace the original worm gear and worm drive. This eliminates mechanical noise, speeds up measurement, and improves measuring accuracy.
Q: A customer gets unstable readings when testing optical rotation samples. What are the possible reasons?
A: Air bubbles in the sample liquid, light source attenuation, encoder malfunction, oxidation of the tube holder, and over-tightened end caps on both sides of the sample tube.
Q: What are the typical service lives of LED light sources, tungsten halogen lamps and sodium lamps?
A: LED light sources last approximately 100,000 hours. Tungsten halogen lamps and sodium lamps have far shorter lifespans: sodium lamps work for several thousand hours, while tungsten halogen lamps last several hundred to several thousand hours.
