Carrier 69NT40-489-100 Series Operation And Service Manual page 134

Table 25. Controlled Atmosphere Pre-Trip Test Codes - - Continued
CODE
TITLE
NO.
Carbon Dioxide
P4-0
Zero Calibration
Oxygen Sensor
P4-1
Zero Calibration
Carbon Dioxide
P4-2
Sensor Check
System
P5-0
Performance Tests
System
Performance Tests
P5-1
Carbon Dioxide
P6-0
Zero Calibration
T-305
This test will attempt a zero-point calibration of the carbon dioxide sensor using
the nitrogen stream, and will run for up to 10 minutes and 30 seconds.
Pass/Fail Criteria: Passes for a successful calibration. Fails otherwise.
This test will attempt a zero-point calibration of the oxygen sensor using a
calibration gas, and will run for up to 12 minutes.
Pass/Fail Criteria: Passes for a successful calibration. Fails otherwise.
If test P4-1 fails, then recheck after test P6-0.
This test will check the span of the carbon dioxide sensor using a calibration
gas, and will run for up to eight minutes.
Pass/Fail Criteria: Passes for a successful check. Fails otherwise.
Requirements: Valid oxygen sensor calibration values must be available.
(Zero-point and span.) The membrane temperature should be within 3_C of
setpoint. However, this test will not fail if this requirement is not met.
Setup: This test will check the nitrogen percentage from the membrane, and
will run for up to 10 minutes.
Pass/Fail Criteria: Passes for a successful check with a nitrogen range greater
than 97.5%. Fails otherwise.
Requirements: Valid oxygen sensor calibration values must be available.
(Zero-point and span.) The membrane temperature should be within 3_C of
setpoint. However, this test will not fail if this requirement is not met.
Setup: This test will check the nitrogen percentage from the membrane while
the nitrogen purity valve is energized, and will run for up to 10 minutes.
Pass/Fail Criteria: Passes, with P5-1 displayed, for a successful check as
defined by the following: N2 range between 88 and 97%. Fails otherwise.
This test will attempt a zero-point calibration of the carbon dioxide sensor using
the nitrogen stream, and will run for up to 10 minutes and 30 seconds.
Pass/Fail Criteria: Passes for a successful calibration. Fails otherwise.
P6-0 is the same as, but independent from P4-0, and is not run during the Auto
Mode of Pre-Trip.
110
DESCRIPTION
NOTE