Automatic Calibration - Emerson Rosemount Oxymitter 4000 Instruction Manual

Oxymitter 4000
Figure 9-1. Membrane Keypad

Automatic Calibration

9-2
calibration gas flowmeter to 5 scfh and calibrate the Oxymitter 4000. To
change the diffusion element, refer to "Ceramic Diffusion Element
Replacement".
Three types of calibration methods are available: automatic, semi-automatic,
and manual.
NOTE
A calibration can be aborted any time during the process. Press the CAL key
(Figure 9-1) on the Oxymitter 4000 keypad three times within three seconds,
or abort via the LOI, HART/AMS, or an IMPS 4000. An aborted calibration will
retain the values of the previous good calibration.
Automatic calibrations require no operator action. However, the calibration
gases must be permanently piped to the Oxymitter 4000, an SPS 4001B or
IMPS 4000 must be installed to sequence the gases, and the logic I/O must
be set to mode 8 via HART/AMS so the sequencer and Oxymitter 4000 can
communicate.
Depending on your system setup, an automatic calibration can be initiated by
the following methods:
1. The Oxymitter 4000's CALIBRATION RECOMMENDED alarm signals
that a calibration is required.
2. Enter a "time since last cal" parameter (CAL INTRVL) via HART/AMS or
the LOI that will initiate an automatic calibration at a scheduled time
interval (in hours). To configure the CAL INTRVL parameter, refer to
"Defining a Timed Calibration via HART" in Section 7: HART/AMS, or
"Navigating the Local Operator Interface" in Section 6: Startup and
Operation of Oxymitter 4000 with LOI.
Instruction Manual
IM-106-340, Rev. 4.3
July 2017