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

Page: 154 / 278

4-46 | Model 920 Multi-Gas Analyzer
Example:
To set AZInt Timer to 4 hours and return to CAL mode normal display,
press:
CAL>F3 8 Del 4 Ent Ent
When you press F3 8 , the existing interval (hours) and the time re-
maining until the next Auto-Zero (hours and minutes) are displayed.
Setting the Sample Delay Timer (SDelay)
The SDelay timer sets the duration after the completion of a calibration
sequence that the CAL Status Relay will wait before indicating that a
calibration is complete. The time delay will also be in effect if a calibration
sequence is aborted. This allows any external recording devices to mark
the point at which the analyzer is again analyzing a representative sam-
ple, permitting a smooth transition from Calibration gas back to Sample
gas. The User Interface and analog outputs continue to show the actual
concentrations at the analyzer unless the track-and-hold result codes are
assigned to the display and analog outputs.
The User Interface gives no indication the delay is occurring or that it has
occurred. The time delay depends on the time required for the sample gas
to reach the analyzer and a stable reading to be obtained.
The timer can be set from 0–255 minutes in one-minute increments. Set
the delay to ‘
0 ’ to turn off the SDelay timer. If the delay is set to ‘ 0 ’, the
CAL Status Relay will indicate the calibration is complete immediately fol-
lowing the end of the calibration.
Example:
To set SDelay to 4 minutes and return to CAL mode normal display, press:
CAL>F3 7 Del 4 Ent Ent

NOTE