Emerson Process Management OXYMITTER 4000 Verify Hazardous Area Oxymitter 4000 Configuration, SW2

Instruction Manual

IB-106-340C Rev. 4.1 July 2004

Hazardous Area Oxymitter 4000

c.Verify Hazardous Area Oxymitter 4000 Configuration

Located on the microprocessor board, the top board, are two switches that configure outputs for the Hazardous Area Oxymitter 4000 (Figure 3-2). SW1 determines if the 4-20 mA signal is internally or externally powered. SW2 determines:

The HART option is not protected by energy limiting barriers. It must not be interfaced from within the hazardous area. The 4-20 mA cables should be routed and the connections made out- side the hazardous area. Note that this is the case even when using the intrin- sically safe version of the handheld communicator.

1.Hazardous Area Oxymitter 4000 status, HART or LOCAL.

2.Oxygen range, 0 to 10% O2 or 0 to 25% O2. (0 to 40% O2 is also configur- able only through HART/AMS.)

3.The 4-20 mA signal, at fault or power up, 3.5 mA or 21.6 mA.

Remove power from the Hazardous Area Oxymitter 4000 before changing defaults. If defaults are changed under power, damage to the electronics package may occur.

d.SW1

The two settings are internally or externally powering the 4-20 mA signal. The factory setting is for the 4-20 mA signal to be inter- nally powered.

e.SW2

The factory sets this switch as follows:

1.Position 1 is HART/LOCAL. This switch setting controls the configuration of the

Hazardous Area Oxymitter 4000. The defaults cannot be changed via HART- /AMS unless the switch is in the HART position. Placing SW2, position 1 in the LOCAL position forces the O2 range to the setting of position 2. The position 1 switch must be placed in the LOCAL position or changes in SW2, position 2 will have no effect.

2.Position 2 determines the O2 range. This can be set to either 0 to 10% O2 or 0 to 25% O2. The factory setting is 0 to 10% O2.

Typically, the probe’s sensing cell, in direct contact with the process gases, is heated to approximately 736°C (1357°F). The external temperature of the probe body may exceed 450°C (842°F). If operating conditions also contain high oxygen levels and com- bustible gases, the Hazardous Area Oxymitter 4000 may self-ignite.

If necessary, the O2 range can be con- figured from 0 to 40% O2. To select values within this range, set SW2, position 1 to HART and then enter the range via HART/AMS. Do not change SW2, position 1 to LOCAL unless you want to operate in the range specified by SW2, position 2.

3.Position 3 determines the output at startup or at an alarm. The settings are 3.5 mA or 21.6 mA. The factory setting is 3.5 mA. At startup, the current at the analog output is 3.5 mA or 21.6 mA.

4.Position 4 can be used to set the heater for 115 or 220 Vac operation. This switch is functional only when the software is set for manual voltage selection (Auto Tune = No). Otherwise, the internal electronics auto detect the input line voltage and sets the heater voltage accordingly (Auto Tune = Yes).

f.Once the cell is up to operating tempera- ture, the O2 percentage can be read:

3-2 Configuration with Keypad Rosemount Analytical Inc. A Division of Emerson Process Management