Emerson Process Management IM-106-340 Identifying and Correcting Alarm Indications

Instruction Manual

IM-106-340, Rev. 4.0 May 2006

Oxymitter 4000

IDENTIFYING AND CORRECTING ALARM INDICATIONS

A Potter & Brumfield R10S-E1Y1-J1.0K 3.2 mA DC or an equal interposing relay will be mounted where the contact wires terminate in the control/relay room.

If autocalibration systems are utilized, the bidirectional logic contact is utilized as a "hand-shake" signal between the autocalibration system (SPS 4001B or IMPS 4000) and is unavailable for alarming purposes. Additional contacts are provided through the autocalibration systems, noted below.

SPS 4001B and IMPS 4000, 1-4 probes

•One contact closure per probe from the control room to the SPS 4001B or IMPS 4000 for "calibration initiate".

•One contact output per probe from the SPS 4001B or IMPS 4000 to the control room for "in calibration" notification.

•One contact output per probe from the SPS 4001B or IMPS 4000 to the control room for "calibration failed" notification. (Includes output from pressure switch indicating "cal gas bottles empty").

Additional IMPS 4000 Alarm Contacts

•One contact per IMPS 4000 for "low calibration gas flowing".

•One contact per IMPS 4000 for "high calibration gas flowing".

NOTE

The 4-20 mA signal can be configured to respond normally during any calibration, or can be configured to hold the last O2 value upon the initiation of calibration. Factory default is for the 4-20 mA signal to operate normally throughout calibration.

NOTE

Holding the last O2 value may be useful if several probes are being averaged for the purpose of automatic control. Unless several probes are being averaged, always place any control loops using the O2 signal into manual prior to calibrating.

For an Oxymitter 4000 with a membrane keypad, faults are indicated by four diagnostic, or unit, alarm LEDs. A pattern of repeating blinks define the problem. A condensed table of the errors and the corresponding blink codes can be found on the inside right cover of the electronics housing. Table 8-1 also identifies the blink code and fault status of each LED as well as the output of the 4-20 mA signal line and a fault number that corresponds to the troubleshooting instructions provided in this section.

For an Oxymitter 4000 with the optional LOI, alarm messages are displayed on the LOI display window when the alarm status display is accessed via the LOI menu. A listing of the alarm/fault messages and the related fault status descriptions and fault numbers are shown in Table 8-2.

8-5