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    Calibration and Bump Test Recommendations When completed regularly, the procedures described below help to ensure instrument operator safety.

    Definitions

    Configuration. The configuration process allows qualified personnel to review and adjust a unit's settings.

    Bump Test . Gas Detection instruments are potentially life-saving devices. The only way to verify proper sensor and alarm operation is to perform a bump test. Bump testing is the process of briefly exposing the installed sensors to an expected concentration of calibration gas that is greater than the low alarm set point. Also referred to as a "functional test", the bump test checks for sensor and alarm functionality but does not measure sensor accuracy and no adjustments are made to the instrument during a bump test.

    Zero
    . Zeroing sets each installed sensor to recognize the ambient air as clean air. If the ambient air is not truly clean air, any gasses that are present and relevant to the installed sensor type will be measured and displayed as zero. Readings will be inaccurate until the unit is correctly zeroed in truly fresh air or with a zero air cylinder.

    Calibration
    . All sensors gradually degrade over time. Without regular calibrations, sensor readings during instrument use will not accurately display true gas concentrations. During the calibration process, the instrument self-adjusts so that the sensors retain their ability to correctly measure and accurately display gas concentration values. When a sensor has degraded beyond an acceptable level, it has reached its end of life and will no longer pass a calibration.

    Peak Readings
    . The instrument stores the highest detected gas reading, the "peak reading" or "peak". Bump testing and calibration will often register new peak readings. Therefore, the clearing of the peak reading should follow each calibration. The instrument operator may also wish to clear the peak reading after a bump test, before a change in location, or after an alarm is addressed and cleared.
    Note: The peak readings and the data log readings are stored independently of one another; therefore, clearing the peak reading does not affect the data log. Powering the instrument off or changing its battery does not affect the peak reading. These checks and balances help promote operator safety, and serve to contain the peak readings in a "black-box" manner. In the event of a gas-related incident, this black-box record can be useful to the safety team or a prospective investigator.

    Self-test (for Tango TX1)
    .The self-test verifies the functionality of the unit's memory operations, battery, and each alarm indicator (audible, visual, and vibration). It does not verify sensor functionality or instrument accuracy.

    Recommendations

    ISC minimum frequency recommendations for each procedure are summarized in the table below. These recommendations include a daily bump test for any ISC instrument that is not operating on DualSense. This includes the Tango TX1 when it is operating with only one working sensor.

    When two redundant, working sensors are installed in the Tango TX1, the instrument is operating on DualSense and the probability of sensor failure – compared with a single-sensor instrument – is diminished regardless of bump test frequency. The frequency of bump testing for DualSense instruments, between monthly calibrations, is best determined by a company's safety policies. These policies may be affected by the directives and recommendations of regulatory groups, environmental conditions, operating conditions, instrument use patterns and exposure to gas, and other factors.

    Procedure

    ISC Recommended minimum frequency

    Non-DualSense instruments
    (MX6 iBrid, Ventis MX4, Ventis LS, M40, GasBadge Plus, GasBadge Pro, T40 Rattler, BM25, Non-DualSense Tango TX1, and all legacy ISC monitors)

    Configuration

    Before first use and as needed thereafter.

    Calibrationa

    Before first use and monthly thereafter.

    Bump testb

    Prior to each day’s use.

    DualSense instruments
    (Tango TX1)

    Configuration

    Before first use, when there is a change in the installed sensor type, and as otherwise needed.

    Calibrationa

    Before first use and monthly thereafter.

    Bump test

    As desired between monthly calibrations.

    Self-testc

    Prior to each day’s use for an instrument that is always on or is left on.

    aBetween regular calibrations, ISC also recommends a calibration be performed immediately following each of these incidences: the unit falls, is dropped, or experiences another significant impact; is exposed to water; fails a bump test; or has been repeatedly exposed to an over-range (positive or negative) gas concentration. A calibration is also recommended after the installation of a new (or replacement) sensor. These recommendations are based on field data, safe work procedures, industry best practices, and regulatory standards to ensure worker safety. Industrial Scientific is not responsible for setting safety practices and policies.
    bIf conditions do not permit daily testing, bump tests may be done less frequently based on instrument use, potential exposure to gas, and environmental conditions. The frequency of testing instruments is best determined by company policy and local regulatory standards.
    cThe Tango TX1 self-test is performed automatically during the start-up process. It can be user-initiated from operation mode.
    Note: The use of calibration gases not provided by ISC may void product warranties and limit potential liability claims.

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