A:Brief description: DSHD-509A Engine Fuels Existent Gum Tester is designed and made as per the national standard of People’s Republic of China GB/T509 Test Method for Existent Gum of Engine Fuels. The main function of DSHD-509A Engine Fuels Existent Gum Tester is to determine tendency of fuels (gasoline, kerosene and diesel oil) to form gum when the fuels are used in the engine. B:Technical parameters 1. Relative humidity: ≤85% 2. Bath type: oil bath 3. Oil bath specification: Φ195 mm×255 mm 4. Oil bath cubage: 5000 ml±50 ml 5. Total power consumption: ≤1200 W 6. Heating power: 1000 W 7. Power supply: AC 220 V±10%, 50 Hz 8. Heating mode: heated by an electric heater 9. Ambient temperature: room temperature～+35 ℃ 10. Temperature controlling range: room temperature～250 ℃ 11. Temperature controlling accuracy: 150 ℃±3 ℃, 180 ℃±3 ℃, 250 ℃±5 ℃