6
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Calibration of the Instrument for Measurement Analysis
Section
Section
Thermo Scientific
Orion 2295 Phosphate Analyzer
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37
Optics Testing
In optics testing, the system checks the optical path and status of the LED source.
During this stage in the cycle, the info field (if enabled) shows the test optics progress bar which
times out at a maximum period of 90 seconds.
Checking Reaction Temperature
When reaction cell temperature control is enabled, at this stage in the cycle the reaction cell
temperature is tested against the set point.
To enable or disable the REACTION TEMPERATURE CONTROL, from the MAIN MENU follow
the sequence:
MENU
➔
SETUP
➔
METHOD
➔
REACTION TEMPERATURE CONTROL
If reaction temperature control is enabled, then the temperature set point is editable. To edit the
temperature set point, from the MAIN MENU follow the sequence:
MENU
➔
SETUP
➔
METHOD
➔
REACTION TEMPERATURE
The temperature stabilization is attained through PID control. Once it reaches the set point, it
stays almost at the same temperature, until and unless the reaction temperature control is
disabled or set point is altered.
This test is allowed a maximum of 240 seconds for the reaction cell to attain the set
temperature. If it does not reach stability or set point in the allowed time, it will flag a warning
message and proceed to the next step. The info field (if enabled) shows the temperature
progress bar.
NOTE:
Optics test may flag the following error messages:
“TESTING OPTICS, PLEASE CHECK FOR OPTICS FAILURE”
Optics test failed due to the non-functionality of the LED source or detector,
measurement is aborted, and the info field will flash the error message.
“TESTING OPTICS PLEASE CHECK FOR STRAY LIGHT”
Stray light reading outside the allowed limits: will flash with a warning
message.
“TESTING OPTICS LOW SIGNAL LEVEL . . . CELL MAY BE COATED AND
MAY REQUIRE CLEANING“
If the test determines that the light energy reading is outside the allowed
limits, the measurement is aborted. The cell may require cleaning, or you
many need to re-calibrate the optics.
