Union Instruments CWD2000 EX, Original Operating Instructions

Page: 59 / 103

Operation
59
Main menu - Options - Calibration - Automatic calibration
Day is a list field (Son, Mon, Tue, ...) while time and cycle are value fields.
The device itself determines the duration of purge time for the calibration gas. For
this purpose it uses a stability criterion. This criterion is reached after 6 to 10 min,
depending on the gas. Afterwards the device automatically switches back to
process gas. If the criterion is not reached, the calibration is aborted after 10 min.
The abortion is documented in the events list.
Attention: After a device restart or a change of calibration gas, the calibration might
need to be repeated 2-3 times. Successful calibration is only possible after the
pulse line to the calibration gas has been purged sufficiently and the entire air has
been displaced out of the line.