Robinson Centrifuges

The second generation of the Robinson ELECTRICALLY HEATED centrifuge that operates from the vehicle’s 12-volt system.

Centrifuge features include:

  • A circular design offering a high-efficiency unit that meets or exceeds the RCF requirements of API and ASTM
  • A rheostat control with an “off” position for a slow, smooth start and speed control.
  • Top-entry motor removal for replacement without removing the centrifuge from its mounting
  • A motor mount plate with a ball bearing provides stabilizing support for the motor shaft.
  • One-inch thick mounting feet to reduce casting failures.
  • Slide open, two section lid, or spring supported lid to keep it open. Designed with a hole in the center so that the centrifuge RPM’s can be checked with a hand held tachometer with the centrifuge lid closed. This feature is especially efficient where room above the centrifuge is limited. This feature also reduces heat loss because it does not require that the complete lid be open for the operator to insert and remove the samples from inside the centrifuge.
  • A pre-heater section located in the front of the centrifuge for easy access to the operator
  • Flip-up pre-heater covers, with positive mechanical tension to keep the covers closed. Easy-to-grab design for easy opening.
  • Easy switch replacement with modul designed front panel. The modular control panel can be removed simply by removing four screws and unplugging the switches. This feature allows the following:
    • Individual switches can be replaced in the modular control panel without removing the centrifuge from the vehicle.
    • The complete control panel can be replaced without removing the centrifuge from the vehicle. The old control panel can be serviced at a work bench.
  • Easy heater assembly replacement in the pre-heater section. The heaters are connected to the switch with quick connect terminals. Remove two screws and lift the heater assembly out of the pre-heater pockets.
  • New switches are IP 68 rated. The rating signifies complete protection against dust and prolonged effect of moisture.
  • Simplified method of testing the electrical components.
  • Three independent electrical circuit design:
    • One circuit operates the motor that spins the samples.
    • A second circuit, controlled by an “on-off” switch and thermostat, heats the centrifuge bowl. When the sample is placed in the centrifuge at 140 °F, the pre-set thermostat prevents the sample temperature from dropping below 125 °F as specified by API and ASTM
    • The third circuit is for the pre-heater section, which is comparable to a separate two-place electrical heater built into the centrifuge. It is operated by a “high-off-low” switch and controlled by the operator. Depending upon the oil sample’s starting temperature, it raises the temperature of two samples to 140 °F in minutes.
  • Space-saver design because a separate heater is not required.
  • A self-reset circuit breaker near the vehicle’s battery protects the centrifuge’s circuit, as well as the vehicle.
  • When the vehicle is not running, an external contactor, wired to the ignition, prevents the heaters from drawing energy from the battery.

Specifications:
100ml short cone, 12 VDC electrically heated, Weight 60 lbs, 22 x 20 x 11 1/2″

Models 820A and 821A with spring supported lid to keep it open

Catalog No. Robinson Manufacturing Catalog Number Description
600.733 820A Portable Heated Oil Test Centrifuge, 12V DC 40A, 4-Cone capacity with pre-heater
600.734 821A Portable Heated Oil Test Centrifuge, 12V DC 40A, 2-Cone capacity with pre-heater

Models 820B and 821B with slide open, two section lid

Catalog No. Robinson Manufacturing Catalog Number Description
600.730 820B Portable Heated Oil Test Centrifuge, 12V DC 40A, 4-Cone capacity with pre-heater
600.731 821B Portable Heated Oil Test Centrifuge, 12V DC 40A, 2-Cone capacity with pre-heater

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