Teledyne 200A - page 40

Teledyne API Model 200A NOX Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
The center field displays TEST values. The TEST functions allow you to quickly access many
important internal operating parameters of the M200A. This provides a quick check on the
internal health of the instrument. The right hand field shows current concentration values of NO,
NOx, and NO2. The display scrolls between the 3 values every 4 seconds.
4.2.5.1 Keyboard
The second line of the display contains eight fields. Each field defines the key immediately
below it. By redefining the keys dynamically it is possible to simplify the instrument electronics
and user interface.
When entering data in the keyboard, if the entered value is not accepted, the M200A will "beep"
to notify the user that the value keyed in was not accepted. The original value remains
unchanged.
4.2.5.2 Status LED's
At the right of the display there are 3 status LED's. They can be in three states, OFF, ON, and
Blinking. The meanings of the LED's are given in Table 4-4-2.
Table 4-4-2: Front Panel Status LED's
LED State Meaning
Green On
Off
Blinking
Monitoring normally, taking DAS data
NOT monitoring, DAS disabled
Monitoring, DAS in HOLDOFF mode (1)
Yellow Off
On
Blinking
Auto cal. disabled
Auto/Dynamic cal. enabled
Calibrating
Red Off
Blinking
No warnings exist
Warnings exist
(1) This occurs during Calibration, DAS holdoff, power-up holdoff, and when in Diagnostic mode.
4.2.5.3 Power Switch
The power switch has two functions. The rocker switch controls overall power to the instrument,
in addition is a circuit breaker. If attempts to power up the M200A result in a circuit breaker trip,
the switch automatically returns to the off position, and the instrument will not power up.
4-5
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