Metek 920, Operator'S Manual With Essential Health And Safety Requirements

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Controller / User Interface | 4-59
4. The CAL Status relay will stay on longer, determined by the SDelay
timer, to allow for a smooth transition from the Zero or Calibration gas
mixture back to the sample gas. The User Interface gives no indication
that this is occurring.
Pressing Esc at any time during this procedure will abort the func-
tion and return to CAL mode normal display.
The Calibration gas mixture concentrations must be entered and the
SSR outputs must be assigned before starting an Auto Calibration.
The Flow Control mode must be controlled by the analyzer (i.e.,
FlowCtrl must be set to ‘ 0 ’).
The Auto-Zero/Auto-Span can be started manually, automatically on a
timed basis, or by a remote dry (potential-free) contact closure. Upon
completion of the sequence, the CAL Status relay will continue to indicate
that a calibration is in process until the
SDelay time has expired.
An Auto-Zero initiated on a timed basis or by a remote contact will
not occur if there is a Fault alarm.
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NOTE
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NOTE