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For several decades nuclear logging tools have relied on Victoreen Corotron high voltage diode corona discharge regulator tubes.  Even before the Victoreen company was chopped up and sold, the Corotron had been discontinued.  The few Victoreen Corotrons still in the marketplace have become very expensive and scarce components, with technicians hoarding the few they have left.

AnaLog Services, Inc. is pleased to offer the Codatron family of high voltage shunt regulators.  Included are the extended temperature range Codatron HT™ (formerly called the TitanTwo) and the low temperature coefficient (TC) Codatron HTZ™ high voltage regulators, Victoreen Corotron replacements designed by Robert L. Baer.  The Codatron HT™ and Codatron HTZ™ regulators are specifically intended for use in well logging tools, but they can replace the Victoreen Corotron in a host of other applications as well.  They are all two lead devices (except for the dual voltage version of the Codatron HT™), and all are direct "drop in" replacements for the Corotron.

The Codatron HT™ regulator series gives superior regulation over rapid temperature changes with guaranteed specifications from -55°C (-67°F) to 177°C (350°F) for the Standard model, and guaranteed specifications from -75°C (-103°F) to 204°C (400°F) for the Grade "A" model.  There is no other high voltage regulator on the market that can approch its performance.  Unlike competing products, the nominal voltage rating is specified at 100°C (212°F), and there is no voltage sag seen at the maximum operating temperature.  In fact there is a small positive temperature coefficient included by design to compensate downhole logging detector temperature response characteristics (see the Codatron HTZ™ below for applications requiring a very low temperature coefficient).  The Codatron HT™ has a recommended operating current around 60 microamps (a setting favored by many technicians), but has an operating current range of 20 to 200 microamps over the full temperature range with excellent voltage regulation.  The minimum shunt current is 2 microamps and the maximum shunt current is 500 microamps up to 177°C (350°F).  The Codatron HT™ can tolerate peak pulse or transient currents in excess of 30 milliamps.  The Codatron HT™ regulator acts like a high voltage zener, but with low noise and a low temperature coefficient.  It exhibits no self-oscillation, and can be used with shunt capacitors since it has positive resistance characteristics at all operating currents.  The Codatron HT™ is a stock item available in all standard Corotron voltages (and many other voltages) in both a Standard model for use to 177°C (350°F), and a Grade "A" model for use to 204°C (400°F).  The Codatron HT™ is also available in a special selectable dual voltage version making it possible to stock one regulator to repair two-detector well logging tools (the 1050 volt / 1250 volt version is ideal for many gamma-ray / neutron tools).  The selectable dual voltage version can also be handy for fine tuning nuclear detector response when two voltages fairly close together are specified.

The Codatron HTZ™ has all the attributes of the Codatron HT™ combined with a very low temperature coefficient (TC) for those applications demanding same. The Codatron HTZ™regulator series gives superior regulation over rapid temperature changes with guaranteed specifications from -55°C (-67°F) to 177°C (350°F) for the Standard model, and guaranteed specifications from -75°C (-103°F) to 204°C (400°F) for the Grade "A" model.  There is no other high voltage regulator on the market that can match its temperatrure coefficient performance.  The Codatron HTZ™ has a recommended operating current around 100 microamps, but has an operating current range of 20 to 200 microamps over the full temperature range with excellent voltage regulation.  The minimum shunt current is 2 microamps and the maximum shunt current is 500 microamps up to 177°C (350°F).  The Codatron HTZ™ can tolerate peak pulse or transient currents in excess of 30 milliamps.  The Codatron HTZ™ regulator acts like a high voltage zener, but with low noise and a very low temperature coefficient.  It exhibits no self-oscillation, and can be used with shunt capacitors as it has positive resistance characteristics at all operating currents.  The Codatron HTZ™ is a stock item available in many voltages in both a Standard model for use to 177°C (350°F), and a Grade "A" model for use to 204°C (400°F).  Customized units are available by special order and can include tailoring of the temperature coefficient to either slightly positive or slightly negative (see the Codatron HT™ above for applications requiring a small positive temperature coefficient as is the case with most well logging tools).

See the Codatron HT™ Adobe PDF Data Sheet and the Codatron HTZ™ Adobe PDF Data Sheet.  Also see our High Voltage Tips & Tricks page for some random notes about downhole high voltage power supplies.

Need more information?  Call (270) 276-5671, or contact us.

02-27-03
Last 10-20-10