Testing The Monitor - Scott Protege SG User Manual

30
CHAPTER 5: MAINTENANCE

Testing the Monitor

087-0065 REV B
This section covers calibration of the monitor.
Warning: Operating a device that has exceeded its calibration date can cause false
readings of detected gases. Readings obtained while monitor is out of calibration are
invalid and could lead to death or injury.
Warning: Bump test and Calibration are not accurate if being performed immediately
after the startup.
Scott Safety recognizes the potential of the device when operated and maintained
correctly. As such, verifying proper operation of the device in the form of Span
Calibration and daily Bump Testing is essential to ensure the device performs as
intended in a potentially hazardous environment.
The frequency at which Calibration and Bump Testing occur is best determined based
on local regulatory standards, company policies, and industry best practices. Scott
Safety is not responsible for setting policies or practices.
•
Zero Calibration — Is performed to establish baseline readings of atmospheres
that are known to be free of toxic or combustible gases.
•
Span Calibration — Is performed to ensure the device detects target gases within
specified operating parameters. Calibration is the adjustment of the monitor's
response to match a known concentration of gas. Sensors can lose sensitivity
through normal degradation, exposure to high gas concentrations, or sensor
poisoning. Accurate calibration can be achieved only if specific concentrations of
the correct gases are used.
•
Bump Testing — Verifies the Span Calibration by subjecting the device to a
known concentration of gas, and verifies that the display reads PASS.
SCOTT SAFETY