Cannon CT-2000

Constant Temperature Bath

Microprocessor-controlled temperature regulation to 150°C Built-in platinum resistance thermometer On-screen temperature monitoring Not for use below ambient temperature. Use our bath cooler to operate below ambient temperature.

The CANNON CT-2000 Constant Temperature Bath maintains the accurate control required by ASTM D 445 for kinematic viscosity measurements. Within the range of 20 to 100°C temperature is controlled to 0.01°C; above 100°C temperature is controlled to 0.03°C.

Setting Temperature

A keypad permits microprocessor-controlled temperature selection to two decimal places at any setting within the operational range of the instrument. The built-in platinum resistance thermometer continuously monitors bath temperature and displays it digitally on a four line by twenty character back-lit liquid-crystal screen. Either Celsius or Fahrenheit display of temperature may be selected. On power-up the CT-2000 performs an automatic self-test of its circuits.

The CT-2000 also features RS-232 and RS-485 communication ports which permit data acquisition and networking via an external computer. Several baths may be networked to a single computer.

Bath Features

The bath chamber is a cylindrical clear Pyrex^® vessel 300 mm (12 inches) in diameter x 300 mm (12 inches) high. A stainless steel baffle coated with white Teflon is located in the center of the bath to provide a good background for viewing viscometers. Two fluorescent lamps illuminate the interior of the bath brightly and uniformly, without glare.

Two heating elements inside the bath rapidly heat the bath medium to any temperature within the bath range. The built-in stainless steel cooling coil, when connected to tap water or a cooling system (not included), permits operation at or near ambient temperature. The cooling system should circulate coolant at a temperature 10-15°C below the desired bath operating temperature.

Use the CBC-100 Bath Cooler to control temperature down to 15 degrees Celcius below room temperature.

The top cover contains seven round holes 51 mm (2 inches) in diameter. Up to seven glass capillary viscometers (in holders) can be placed in the bath. Two additional holes 10 mm ( 3/8-inch) in diameter are provided for thermometers.

A solid-state control circuit equipped with a stainless steel-encased thermistor provides proportional control of temperature. A motor driven stirrer ensures a uniform temperature throughout the bath. The entire electrical control system is located in a convenient drawer for easy access if adjustment or repair is necessary.

All wetted parts of the bath are made of stainless steel, glass, or Teflon^®. The bath housing is fabricated from heavy aluminum and coated with a corrosion-resistant epoxy finish. The top cover consists of three parts: a stainless steel top surface, an insulating layer, and a bottom stainless steel heat reflector.

The bath is designed to use water or oil (not supplied). Viscometers, holders, bath oil and thermometers must be purchased separately.

Safety Features

There are multiple safety features. A thermistor in the bath senses any over-temperature fault condition. If such a condition occurs, all power is removed from the bath until an operator resets the over-temperature limit control circuit. A second safety feature cuts power to the heaters if the control thermistor is disconnected. A liquid-level sensor prevents the control circuit from heating the bath until the safe operating level is attained. The bath heaters are automatically turned off when the bath liquid drops below the minimum safe level.