Emerson OXYMITTER 4000 - Manual (Page 82)

Instruction Manual
IB-106-340 Rev. 3.0
December 2003
4-2 Configuration with LOI Rosemount Analytical Inc. A Division of Emerson Process Management
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% O
2
or 0 to
25% O
2
. (0 to 40% O
2
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 O
2
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 O
2
range.
This can be set to either 0 to 10% O
2
or 0 to 25% O
2
. The factory setting is 0
to 10% O
2
. If necessary, the O
2
range
can be configured from 0 to 40% O
2
.
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).