Emerson manual Verify Oxymitter 4000 Configuration

Instruction Manual

IB-106-340 Rev. 3.0 December 2003

Oxymitter 4000

c.Verify Oxymitter 4000 Configuration

Located on the microprocessor board are two switches that configure outputs (Figure 4-2). To access these switches, the LOI module must be removed. SW1 determines if the 4-20 mA signal is internally or exter- nally powered. SW2 determines:

1.Range control, 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 before changing de- faults. 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 controls the configuration of the Oxy- mitter 4000. The defaults cannot be changed via HART/AMS or the LOI unless the switch is in the HART posi- tion. Placing this switch in the LOCAL position forces the O2 range to the set-

ting of position 2. This switch must be in the LOCAL position or changes in position 2 will have no effect.

Typically, the probe’s sensing cell, which is in direct contact with the pro- cess gases, is heated to approximately 1357°F (736°C), and the external tem- perature of the probe body may ex- ceed 842°F (450°C). If operating conditions also contain high oxygen levels and combustible gases, the Oxymitter 4000 may self-ignite.

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

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 se- lection (Auto Tune = No). Otherwise, the internal electronics auto detect the input line voltage and sets the heater voltage accordingly (Auto Tune = Yes).

4-2 Configuration with LOI Rosemount Analytical Inc. A Division of Emerson Process Management