Existent Gum Tester LEGT- B31

Labtron LEGT-B31 is fabricated with heating bath and air compressor to be more accurate and meet the industrial requirements. The instrument is designed and made as per ASTM D381-12 “Test Methods for Existent Gum of Vehicle Gasoline and Aviation Fuels (Jet Evaporation Methods)”.

Bath type
Bath capacity
Ambient temperature
Relative humidity
Temperature controlling range
Temperature controlling accuracy
Heating type
Evaporation bath type and size Aluminum block bath, φ260 × 130 mm
Constant temperature bath
Holes for testing 3 pieces
Size of holes for testing cylinder φ51 × 70 mm
Flow rate display Flow meter
Working temperature 60 ℃ to 165 ℃
Temperature controlling methods Automatic temperature controlling
Temperature display Digitally displayed
Working pressure for decompression valve 0.035 MPa
Gas source Compressed air > 110 L/min
Air flow rate at jet nozzle
Dimension 550 x 370 x 335 mm
Total power consumption
Heating power
Power supply AC 220 V ± 10 %, 50 Hz; 2.5 kW
  • Independent flow meter use to adjust jet flows
  • Designed heating bath and gas circuit
  • Evaporation rate is good
  • Determination of three sample can be done simultaneously

It is widely used in petroleum, chemical, automobile and development industry. It is also suitable for determining the existent gum content of aviation gasoline and motor gasoline.

Evaporation bath type and size Aluminum bath φ260 × 130 mm
Holes for testing 5 pieces
Size of holes for testing cylinder φ51 × 70 mm
Working temperature 160 ℃ ~ 165℃
Bath type Oil bath
Bath capacity 5000 ml ± 50 ml
Ambient temperature Room temperature to 35 °C
Relative humidity ≤ 85 %
Samples 6
Temperature controlling mode Automatic digital temperature
Temperature controlling range Room temperature ~ 160 °C
Temperature controlling accuracy ± 0.2 °C
Samples 8
Temperature 100 ℃
Temperature controlling accuracy 0.1 ℃
Flow meter 3 ± 0.3 L / H oxygen
Samples 2
Oil bath cubage 30 L
Angle between bomb and water surface 30 °
Speed of rotary assembly 100 ± 5 RPM
Graduated Flask 100 ml
Standard Water Value 51 ± 1 s
Temperature Range 0 ~ 100 °C
Temperature Controlling Accuracy ± 0.1 °C
Graduated Flask 200 ± 0.2 ml (50 ± 0.2 ml for bituminous materials)
Standard Water Value 51 ± 1 s
Temperature Range 0 ~ 100 °C
Ambient Temperature 10 °C ~ 40 °C
Graduated Flask 200 ± 0.2 ml
Standard Water Value 51 ± 1 s
Temperature Range 0 ~ 100 °C
Temperature Controlling Accuracy ± 0.2 °C
Measurement range 32 ℃ to 160 ℃
Ambient temperature 35 °C
Temperature resolution 0.01 ℃
Beaker volume 1000 mL
Calorimeter type Isoperibol
Temperature range 5 to 40°C
Measurement range 5 to 40 MJ/ kg
Operation Mode The outer barrel temperature is constant
Calorimeter type Isoperibol
Temperature range 5 to 40°C
Measurement range 5 to 40 MJ/ kg
Operation Mode A. Outer barrel temperature follows room temperature change mode Or B. Outer barrel temperature constant mode
Calorimeter type Isoperibol
Oxygen filling Fully automatic oxygen filling & releasing, fully automatic bomb raising & lowering
Bomb volume 250 ml
Analysis time < 8 min full test process: <10 min
Experimental temperature range -50 to 70°C
Test sample volume 50 ml
Ambient temperature range 10 to 40°C
Humidity ≤ 85%