Thermo Scientific 49i Instruction Manual page 61

Zero/Span/Purge Duration
Thermo Fisher Scientific
• Use
• Use
• Press
ZERO/SPAN PERIOD:
CURRENTLY:
SET TO:
CHANGE VALUE
RANGE
The Zero Duration Minutes screen defines how long zero air is sampled by
Minutes the instrument. The span and purge duration screens look and function the
same way as the zero duration screen, and are used to set how long the span
gas and sample gas are sampled by the instrument. Durations between 0 and
60 minutes are acceptable. Each time a zero/span check occurs the zero
check is done first, followed by the span check. To perform just a zero
check, set the span and purge duration screen to 0 (off ). The same applies
to perform just a span or purge check.
• In the Main Menu, choose Calibration > Zero/Span Check > Zero,
Span or Purge Duration Min.
• Use
• Use
• Press
ZERO DURATION:
CURRENTLY:
SET TO:
CHANGE VALUE
RANGE
and to move the cursor left or right.
and to increment and decrement the numeric value.
to save the period.
024 HRS
025 HRS ?
MOVE CURSOR
SAVE
AVG DIAGS ALARM
and to move the cursor left or right.
and to increment and decrement the numeric value.
to save the duration value.
30 MIN
31 MIN ?
MOVE CURSOR
SAVE
AVG DIAGS ALARM
Operation
Calibration Menu
Model 49i Instruction Manual 3-25