Existent Gum Evaporation Bath

Gum formed during fuel storage can deposit on induction system surfaces, intake valves, stems and guides. To test for gum content, a 50mL sample is evaporated in an aluminum block bath for a specified period under controlled conditions of temperature and flow of air (aviation and motor gasolines) or steam (aircraft turbine fuel).

  • Conforms to ASTM D381 and related specifications
  • Choice of three-unit and six-unit models
  • Safety top assembly allows for easy positioning and connection of all conical adapters to the bath
  • Digital flowmeter for accurate and precise air flow measurement
  • Available with built-in steam superheater
  • Microprocessor programmable high accuracy temperature control
  • Built-in pressure regulators and air flowmeters

Electrically heated baths for determining existent gum in aircraft turbine fuels by steam-jet evaporation and in motor and aviation gasolines by air-jet evaporation. Fully insulated, aluminum block design assures safe, efficient high temperature operation. Equipped with air/steam pressure regulator with gauge and a digital flowmeter for adjusting air flow per ASTM specifications. Stainless steel jets deliver air or steam flow to the test wells through removable brass conical adapters. Microprocessor PID control provides quick temperature stabilization without overshoot and the bath is protected by an over-temperature control circuit that interrupts power should the bath temperature exceed a programmed cut-off point. Dual LED displays provide actual and setpoint temperature values in °C/°F format. 

Model K33900 with Built-in Superheater – Six-unit bath with a built-in thermostatically controlled superheater which delivers dried steam to the bath inlet for steam-jet method testing of aircraft turbine fuels. Has digital indicating solid state bath temperature control with digital setpoint and display.

Model K33780 – Three-unit bath without built-in superheater. All controls are housed in the bath cabinet. For steam-jet method testing of aircraft turbine fuels. Meets output requirements of three-unit and six-unit evaporation baths. Electrically heated for clean, efficient operation and ease of installation. Meets applicable ASME, NEC standards; UL listed, CSA approved. Electrically heated boiler provides instantaneous and reserve steam capacity for steam-jet evaporation tests. Easy to install and operate; electrical heating eliminates the need for on-site fuel combustion. Requires only a water feed source and electrical hook-up. Ruggedly constructed, with long-life industrial grade incoloy heating element. Includes a full range of safety features: automatic water level control and low water cut-off; steam safety valve; high-limit pressure cut-out with manual reset; steam pressure gauge.

  • Conical Brass Adapters for air/steam jets

Conforms to the specifications of: ASTM D381; IP 131; IP 540; ISO 6246; DIN 51784;

FTM 791-3302; NF M 07-004

Testing Capacity: K33900: 6 sample beakers

K33780 and K33781: 3 sample beakers

Maximum Temperature: 475°F (246°C)

Temperature Control Stability: ±1°F (±0.5°C)

Bath Configuration: machined aluminum block with multiple cartridge heaters

Heater Range:

K33900: 0-3000W
K33780 and K33781: 0-1500W

Superheater: (Model K33900 only)

Superheating chamber and condensate trap constructed of stainless steel
Solid state thermoregulator (0-550°F) Heater Range: 0-3000W

Steam Generator: Output: 54.1 lbs steam/hr at 212°F

Bhp Rating: 1.83

kW Rating: 18

K33900: 220-240V 50/60Hz, Single Phase, 20.4A
K33780: 115V 60Hz, Single Phase, 13.0A
K33781: 220-240V 50/60Hz, Single Phase, 6.8A

K33900: 21x20.5x28 (53.34x52.07x71.12)
K33780/K33781: 32.5x11x19 (83x28x48)

Net Weight: 
K33900: 230 lbs (104.3 kg)
K33780/K33781: 85 lbs (38.6 kg)

Shipping Weight

K33900: 313 lbs (142 kg)
K33780/K33781: 168 lbs (76.2 kg)


K33900: 34x30x28 in. (86.4x76.2x71.1 cm)
K33780/K33781: 34x20x25 in. (86.4x50.8x63.5 cm)

  • K33710 Sample Beaker, 100mL spun copper, 50x78mm 
  • 332-002-017 Sample Beaker, Borosilicate Glass, 100mL
  • 250-000-03F ASTM 3F Thermometer Range: 20 to 760°F 
  • 250-000-03C ASTM 3C Thermometer Range: –5 to +400°C
  • K33810 Steam Superheater, provides dry superheated steam for evaporation baths not equipped with a built-in superheater. Use together with an outside steam source for steam-jet method testing of aircraft turbine fuels. Superheating chamber and condensate trap are constructed entirely of stainless steel. Solid state temperature controller adjusts between 0-550°F. Equipped with steam inlet and outlet connections and condensate drain valve. Steel exterior has a chemical resistant polyurethane enamel finish. Dimensions 5x27x91⁄2" (13x70x24cm). Shipping Weight: 23 lbs (10.4kg). 220-240V 50/60Hz, Single Phase, 6.8A
  • K33850 Steam Boiler, 120/240V 60Hz, Three Phase
  • K33850/208601 Steam Boiler, 208V 60Hz, Single Phase, 87A
  • K33850/208603 Steam Boiler, 208V 60Hz, Three Phase, 50A
  • K33850/240601 Steam Boiler, 240V 60Hz, Single Phase, 75A
  • K33850/240603 Steam Boiler, 240V 60Hz, Three Phase, 43A
  • K33850/380603 Steam Boiler, 380V 50/60Hz, Three Phase, 27A
  • K33850/415503 Steam Boiler, 415V 50Hz, Three Phase, 25A
  • K33850/480603 Steam Boiler, 480V 60Hz, Three Phase, 22A

Below are links to tutorial videos for this product