MSA Chillgard LS - Chapter 4 Calibration; Warning; Diffusion Version Calibration; Calibration Equipment - (FIGURE 4-1)

Chapter 4
Calibration
Diffusion Version Calibration
Calibration Equipment - (FIGURE 4-1)
Calibration of the monitor requires a supply of:
• ZERO GAS (air or nitrogen) It may be possible to use ambient air if
you are sure it does not contain any possible interferant gases or
contaminants.
• SPAN GAS (A known refrigerant concentration) that measures
approximately 10% of the full-scale calibration of the unit. See
TABLE 5-2 for available refrigerant gas cylinders.
Relative humidity may have a small effect on the output of the unit. If
dry gas is used, Nafion Tubing (P/N 813628) can be used to humidify
the sample stream going to the monitor.
Both ZERO gas and SPAN gas must be carefully applied to the unit to
avoid pressurizing the internally mounted optical bench.
See TABLE 5-2, Calibration Accessories Parts List for the appropriate
calibration parts and calibration gases available for the Chillgard LS
Refrigerant Monitor.
Exercise care during the span calibration to ensure that the unit can
accurately detect refrigerant gas. Improper calibration can cause
improper readings across the full-scale range of the monitor.
"
WARNING
Figure 4-1. Calibration Equipment
Calibration Adapter P/N 10034395
0.25 LPM Flow Controller P/N 478359
4-1