K33700 Existent Gum Evaporation Bath


Test Method
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).

Features and Benefits
• Conforming to ASTM D381 and related specifications

• Choice of three-unit and six-unit models

• Available with built-in steam superheater

• Microprocessor programmable high accuracy temperature control

• Built-in pressure regulators and air flowmeters


K33700 Existent Gum Evaporation Bath
Evaporates aircraft turbine fuel and motor and aviation gasoline samples under controlled conditions in accordance with ASTM specifications. Consists of a high temperature evaporation bath with 100mL test beakers and, for aircraft turbine fuels, a steam generator and steam superheater.

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 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 overtemperature control circuit that interrupts power should bath temperature exceed a programmed cut-off point. Dual LED displays provide actual and setpoint temperature values in C/F format. Communications software (RS232, etc.), ramp-to-set and other enhanced features are available as extra cost options. Contact your Koehler representative for information.

Model K33800 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 K33700–Six-unit bath without built-in superheater. Controls are housed in a separate cabinet connected to the bath by multi-conductor cable.

Model K33780–Three-unit bath without built-in superheater. All controls are housed in the bath cabinet.

Conforms to the specifications of: ASTM D381; IP 131; ISO 6246; DIN 51784; FTM 791-3302

Testing Capacity
K33800 and K33700: 6 sample beakers
K33780 and K33781: 3 sample beakers

Maximum Temperature
475F (246C)

Temperature Control Stability
1F (0.5C)

Bath Configuration
Machined aluminum block with multiple cartridge heaters

Heater Range
K33800 and K33700: 0-3000W
K33780 and K33781: 0-1500W

Superheater (Model K33800 only)
Superheating chamber and condensate trap constructed of stainless steel
Solid state thermoregulator (0-550F) with heater range of 0-1500W

Electrical Requirements
K33700: 220-240V, 50/60Hz, Single Phase, 13.6A
K33800: 220-240V, 50/60Hz, Single Phase, 20.4A
K33780: 115V, 50/60Hz, Single Phase, 13.0A
K33781: 220-240V, 50/60Hz, Single Phase, 6.8A

Included Accessories
Conical Brass Adapters for air/steam jets

Dimensions lxwxh,in.(cm)
K33800: 32.5x20x20 (83x51x51)
K33780: 32.5x11x19 (83x28x48)
K33700: Bath: 28x20x16 (71x51x41) Control Cabinet: 9x8x6.5 (23x20x17)
Net Weight:
K33800: 230 lbs (104.3kg)
K33780: 85 lbs (38.6kg)
K33700: 203 lbs (92.1kg)

Shipping Information
K33800: Shipping Weight: 313 lbs (142kg)
Dimensions: 17.2 Cu. ft.
K33780: Shipping Weight: 140 lbs (63.5kg)
Dimensions: 8.3 Cu. ft.
K33700: Shipping Weight: 271 lbs (123kg)
Dimensions: 13.7 Cu. ft.

Ordering Information



Product Description

Electrical Requirements


Existent Gum Evaporation Bath, 6-Unit with Superheater

220-240V 50/60Hz


Existent Gum Evaporation Bath, 6-Unit

220-240V 50/60Hz


Existent Gum Evaporation Bath, 3-Unit

115V 50/60Hz


Existent Gum Evaporation Bath, 3-Unit

220-240V 50/60Hz