QIRF Operation And Maintenance Manual
QIRF Operation Manual
May. 01, 2012
85050-301-000 Rev C
20
3.9 Menu “2_Zeroing Calibration”
Calibration should not vary significantly over a period of years; however, it is best to
perform a verification calibration after installation, and at one-year intervals thereafter.
All units are factory calibrated.
The QIRF uses full scale as its CAL GAS concentration:
Basically, QIRF full scale for all Refrigerant gases is 1000ppm except for R123, which is
100ppm.
Gas Type
Full Scale
Cal Gas Concentration
R134a
1000ppm
1000ppm
R123
100ppm
100ppm
R22
1000ppm
1000ppm
R11
1000ppm
1000ppm
Others
1000ppm
1000ppm
The QIRF smart sensor is calibrated using a two-point calibration process. First, use a
“Zero Gas”, then use a “CAL Gas” containing a known concentration of a standard
reference gas, to set the second point of reference.
3.9.1 Equipment Required
•
A cylinder of Zero Gas: it can be clean room air or Zero Air (20.9% Oxygen in
Nitrogen).
DO NOT USE PURE NITROGEN
.
•
A cylinder of Cal Gas (balanced with air,
DO NOT USE BALANCED
WITH NITROGEN
)
•
Flow Limiting Regulator(s)
0.4 to 0.6 lpm
•
Tubing
3.9.2 Zeroing Calibration Procedure
2_ ZERO
CAL
ZEROING?
NN PPM
S3 R134a
ZERO...
ACCEPTED
YES
ESC
YES
Zeroing Calibration Flow Chart
Note: No adjustments or calibration should be performed within 24 hours
stabilization.
Note: Zeroing Calibration must be performed before Span Calibration.
1. Connect tubing to QIRF
