Tinker & Rasor CI-50 User Manual

Sponsoring members of NACE International, NACE Foundation

QMF-570 109-094

MODEL CI-50

CURRENT INTERRUPTER

(2010 RELEASE)

Contents of the shipping package:

Instrument Kit Includes:

 Model CI-50 Instrument in tan case
 (4) AA Batteries (installed)
 Cable, 6’ length with clamps
 Instruction manual
 Warranty Card

Inspection of the instrument should be performed upon receipt. If damage has occurred in
shipment, file a claim with the carrier immediately. If it is necessary to contact your supplier
or Tinker & Rasor, be sure to include all information such as serial number, purchase order
number and invoice number.

Important Note Regarding Rectifier Spikes

Most rectifiers experience a voltage spike when opening and closing, due to a capacitance effect
in the system that can be quite large and very fast. Depending upon the magnitude and duration
of the spike, the CI-50, and most other current interrupters made today, can become significantly
damaged. It is recommended that an oscilloscope be connected to a rectifier and the rectifier be
manually cycled to see what type of spike may be present, prior to using an interrupter. This step
is suggested for all rectifiers, but is a recommendation if the DC output of the rectifier is 50% or
more of the maximum current the interrupter can handle. To better understand this issue, please
see Technical Appendix A (attached to this document).

General Information

The Model CI-50 Current Interrupter is designed to interrupt cathodic protection systems. The
instrument is capable of interrupting up to 50 Amps of current at up to 120 volts (6000 WATT).
The Model CI-50 can be used to interrupt the connection between:

 Rectifier and Structure (DC)
 Rectifier and Anode(s) (DC)
 AC Source and Rectifier (120v, single phase)

NOTE: Do not connect the interrupter to the AC output side of rectifiers that have
an efficiency transformer. Always interrupt the DC (output) leg (not the taps) of the
circuit in that case.

Tel: [phone] Fax: [phone]

P. O. BOX 1667 SAN BERNARDINO, CA 92402

Web: www.tinker-rasor.com E-mail: [e-mail]

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Sponsoring members of NACE International, NACE Foundation

QMF-570 109-094

MODEL CI-50

Common Uses of the Model CI-50 include:

 Close Interval Surveys (CIS)
 On / Off Potential Surveys
 Stray Current / Interference Testing
 Fall of Potential
 DCVG

The Model CI-50 is easily programmed with Closed (Seconds On) and Open (Seconds Off)
cycles of between 0.1 sec and 99.9 sec, in 0.1 sec increments. The instrument is microprocessor
controlled for accurate timing and uses electronic switching instead of mechanical relays. The
CI-50 is not a GPS synchronizing instrument.

NOTE: The CI-50 is designed to be used by trained individuals. Many jurisdictions
have laws or recommendations for the type of training necessary in order to handle
high voltage connections. Consult your company or jurisdiction for guidance in the
type of training necessary to use this instrument properly.

Programming the CI - 50:

The Model CI-50 is capable of interrupt cycles of 0.1 sec Closed (Seconds On) and Open
(Seconds Off). To program the CI-50, it is necessary to follow these simple steps:

(1) Turn the instrument on by moving the toggle switch UP. Note that the OPEN LED turns

on. (If Low Batt LED is flashing, it is recommended that the batteries be changed)

(2) Wait for the instrument to initialize. This is

indicated by the display quickly counting
up numbers, Left to Right, then returning

to blank.
(3) Press the Program button.
(4) The first digit (Left side) begins to blink.
(5) Press the appropriate Adjust Digit button (Up or Down) to change the display to the

desired digit.
(6) When the Left most number is the correct digit for your programming, press Program

button again, and the next digit begins to blink. This digit

may now be adjusted using the Adjust Digit buttons.
(7) Repeat steps 3 through 6 until all six (6) digits have been

programmed.
(8) Press Program button again and the display will turn off.

The Model CI-50 is now programmed and ready for operation.

NOTE: When the Display is shown by pressing the View Program button, the
instrument cannot be programmed. The Program button will not work until the
Display is turned off by again pressing the View Program button, or by
automatically shutting off. Once the Display is off, the Program button can be used.

Tel: [phone] Fax: [phone]

P. O. BOX 1667 SAN BERNARDINO, CA 92402

Web: www.tinker-rasor.com E-mail: [e-mail]

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Sponsoring members of NACE International, NACE Foundation

QMF-570 109-094

MODEL CI-50

To begin an interruption program, the Model CI-50 is first turned On by moving the Power toggle
switch to On (Up). Note the OPEN LED is lit.

NOTE: If the Low Batt LED is flashing, this is an indication that the batteries are
low. It is recommended that the batteries be changed. (See the Batteries section
below for more information.)

After initialization (display shows numbers quickly counting up, Left to Right), press the Start /
Stop button. The programmed timing sequence will begin. The On (Closed) and Off (Open)
cycles are shown by the LED indicators above each timing display.

NOTE: The LED indicators for Closed and Open stay lit for the duration of that part
of the cycle.

Connections

The Model CI-50 should always be turned Off (Power toggle switch to Off (down) when making
or breaking connections.

Connecting the Model CI-50 is done using the supplied cable. A single plug in –type connector
on the end of the cable is pushed into the connector on the Right side of the
case, just below the text, “MODEL CI-50” in the upper Right hand
corner of the panel.

This is a secure, locking connection. To release the plug, the release tab
must be pushed in as the cable connector is pulled away from the case. The
release tab is the silver colored tab on the cable connector. This tab should be facing the user
and easily recognized. Do not attempt to force the removal of the cable connector as this may
damage the connector(s) and render the instrument non functional.

The cable splits into two with clamps on the opposite end of the cable from the
case connector. These clamps are used to break the connection of the circuit to
be interrupted.

The clamps have a maximum jaw opening of 0.75” (19mm). Each clamp is

covered with a vinyl insulator.
The CI-50 may be connected to either the input or output side of the cathodic
protection circuit. Always be careful to observe rating limits shown in the

Specifications section, below. It is not necessary to observe polarity with output terminals.
WARNING: Do not connect the interrupter to the DC output side of rectifiers that have an

efficiency transformer. Always interrupt the AC (input) circuit.

NOTE: The CI-50 is designed to be used by trained individuals. Many jurisdictions
have laws or recommendations for the type of training necessary in order to handle

Tel: [phone] Fax: [phone]

P. O. BOX 1667 SAN BERNARDINO, CA 92402

Web: www.tinker-rasor.com E-mail: [e-mail]

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