Emerson Process Management IM-106-340 instruction manual Automatic Calibration, Membrane Keypad

Oxymitter 4000

Instruction Manual

IM-106-340, Rev. 4.0 May 2006

Figure 9-1. Membrane Keypad

HEATER T/C

DIAGNOSTIC HEATER

ALARMS O2 CELL

CALIBRATION

CALIBRATION RECOMMENDED

TEST

POINTS

INC INC

HIGH LOW GAS GAS

DEC DEC

O2 CELL mV +

O2 CELL mv -

HEATER T/C +

HEATER T/C -

CAL

TEST GAS + PROCESS - % O2

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Automatic Calibration

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.

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