IMPORTANT: Calibration and/or bump testing requires the MRLDS-450 Calibration
Adapter Kit (P/N 809-1190).
IMPORTANT: At elevations higher than 6,560’ (ft) (2,000 m), calibration will result in a
lower reading. Above 6,560’ (ft), the instrument should be calibrated in the environment of
operation.
28 • MRLDS-450 Refrigerant Gas Detection I&O Manual
026-1316 Rev 0
1. Fit calibration adapter to the gas detector lid.
Figure 5-1
- Calibration Adapter Fitting
2. If using a variable flow regulator, adjust the gas flow to approximately 0.3 L/min.
5.2.3. Zero Adjustment
Ambient air can be used to zero the sensor instead of synthetic air only if the area is
known to be free of the target gas or any gas to which the sensor may be
cross-sensitive. In this case, no cylinder or calibration adapter is needed for the zero
adjustment.
IMPORTANT: The MRLDS-450 MAY NOT be in an alarm or fault condition during
calibration. Acknowledge any alarms or faults BEFORE attempting to begin the
calibration process.
IMPORTANT: Except for CO2 or O2 sensors, ambient air may be used instead of zero gas
if the area is known to be free of the target gas or any gases to which the sensor may be
cross-sensitive.
