CQI-9 Special Process: Heat Treat System Assessment, 2 Edition ...
CQI-9 Special Process: Heat Treat System Assessment, 2 Edition ...
CQI-9 Special Process: Heat Treat System Assessment, 2 Edition ...
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CLARIFICATION TO "GENERAL NOTES FOR AMS 2750D"<br />
PAGES 16 & 17, <strong>CQI</strong>-09 2 nd <strong>Edition</strong><br />
2) Comparative Method: The relationship between the control system (sensor, leadwire, control<br />
instrument) and any other permanently installed monitoring system such as over temperature<br />
control system (sensor, leadwire, over temp instrument) or a load monitoring system (sensor,<br />
leadwire, recording instrument) etc. at the time of the most recent conforming instrument<br />
calibration test shall be established. This established relationship shall not differ by more<br />
than +/-1C (or +/-2F) when checked weekly at a typical operating temperature.<br />
Example of Comparative<br />
Method<br />
Chart Recorder<br />
Control Instrument<br />
1500<br />
1501<br />
Control Sensor<br />
Over Temp<br />
Protection Furnace Wall<br />
Other permanently installed thermocouple<br />
(If utilized)<br />
Over-Temp Sensor<br />
Furnace<br />
Work Zone<br />
Part or Raw<br />
Material<br />
Note: It is strongly recommended that<br />
the comparative check be performed at or near the original temperature<br />
temperature<br />
- Any actions to correct a failing reading or validate a test result shall be documented.<br />
- Control Sensors (CS) failing to meet the requirements of SAT method 1 shall be changed. A<br />
new TUS is not required unless the position of the control sensor changes. If new<br />
thermocouple(s) are required in Test method 2, a new relationship must be established.<br />
- Thermocouple Replacement Schedule:<br />
o Base metal sensors (e.g. Type K, N, J, E) thermocouples shall be changed when needed<br />
or annually at a minimum for equipment operating at or above 760C (1400F).<br />
o Base metal sensors (e.g. Type K, N, J, E) thermocouples shall be changed when needed<br />
or every two years at a minimum for equipment operating below 760C (1400F).<br />
o Noble metal sensors (e.g. Type R and S) thermocouples shall be changed when needed<br />
or every two years at a minimum for equipment operating at or above 760C (1400F).<br />
o Note: A new TUS is not required for any thermocouple replacement unless the position<br />
of the control sensor(CS) is changed (CS)
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