MSA Ultima X Instruction Manual page 4

7. Extremely high concentrations of combustible gas or vapor
between the lower explosive limit (LEL) and the upper explosive
limit (UEL) will cause the indication on the Ultima X Gas Monitor to
indicate full scale or above full scale. If the concentration level is
further increased and exceeds the UEL, the display will continue to
show an above scale indication. Gas or vapor concentrations
above the UEL are extremely dangerous since the instrument
cannot measure them accurately, and when reduced by the
addition of air to a level below the UEL, they again constitute a
violently explosive mixture.
Therefore, every alarm causing condition or situation must be
investigated to determine that the
area being monitored does not contain a gas or vapor in air
mixture that exceeds the LEL or UEL.
FAILURE TO FOLLOW THE ABOVE WARNING CAN RESULT IN
SERIOUS PERSONAL INJURY OR DEATH.
1. Perform periodic leak check on all of this unit's flow system
components and fittings. Ensure the flow is within specifications.
2. As with all sensors, high levels of, or long exposure to, certain
compounds in the tested atmosphere contaminate the sensors. In
atmospheres where an Ultima X Sampling Module - Aspirated
Model may be exposed to such materials, calibration should be
performed frequently to ensure that channel operation is
dependable and display indications are accurate.
3. The only absolute method to ensure the proper overall operation of
this unit is to check the associated sensor (s) with a known
concentration of the gas for which it has been calibrated.
Consequently, calibration checks must be included as part of the
routine inspection of the system.
FAILURE TO FOLLOW THE ABOVE CAUTION CAN RESULT IN
INJURY, PRODUCT DAMAGE, AND / OR AN UNSAFE CONDITION.
" CAUTION
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