• SIGNA MR355 / SIGNA MR360
  • Service Manual
  • 5856356-3EN Revision 5.0
  • Basic Service Documentation. Copyright General Electric Company.
  • Object ID: 00000018WHA30C872GYZ
  • Topic ID: id_2001642 Version: 5.0
  • Date: Feb 3, 2021 9:45:48 PM

Troubleshooting leak detection sensors

Prerequisites

Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1-30 minutes-
Tools and test equipment
ItemQuantityPart numberManufacturer
Digital Voltmeter (DVM)146-194427P284-
Safety

Before working in any GE Healthcare MR suite or performing any GE Healthcare service procedure, you must:

  • Have read and understood all hazard conditions and safety requirements in the latest revision of the GE Healthcare MR Service Safety Manual (5452735).
  • Have successfully completed all relevant GE Healthcare Environmental Health and Safety (EHS) courses (or for non-GE employees, equivalent workplace training courses).
  • Comply with all site-specific training and workplace safety requirements.

If you have any safety concerns at any time, do not begin work or immediately stop work and move to a safe location. Immediately contact your supervisor or site safety officer for instructions on how to proceed.

Procedure

  1. Measure the resistance at each connector of the leak sensor system starting from the cabinet monitor end.
    • At the cabinet monitor connector, measure from pin 8 to pin 9 for leak sensor 2, and pins 1 and 2 for leak sensor 1.
    • At the leak sensor connectors, measure from pin 1 to pin 3.
    Measured ResistanceCondition
    < 5 MOhmsPossible wet sensor or coolant leak
    5 MOhms to 13 MOhmsOperational range
    8.2 MOhms ± 0.82 MOhmsIdeal range
    >13 MOhmsPossible severed cable or an open in sensor path

    Result

    If the measured resistance is in the ideal range or the operational range, proceed to measuring the resistance at the next connector.

    If the measured resistance is out of the operational range, identify and resolve the problem with the previous line.
    Table 1. Common problems
    ProblemResolution
    Wet sensor stripDry the sensor strip. If this does not resolve the problem, replace the sensor strip.
    Disconnected sensor stripReconnect the sensor.
    Bent connector pinCarefully straighten the bent connector pin. If the connector pin breaks, replace the connector.
    Severed cableReplace the cable.
    Figure 1. Resistance check
  2. After the system is powered on, make sure the error is fixed. If the error is fixed, there are no error messages at the host, and all system functions that connect to e-stop are operating.