Emerson 7003M - Manual (Page 33)

Operator Manual
748223-K
June 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Operation 3-7
Model 7003M
d. Automatic Return to RUN Mode
If no keys are pressed for five minutes,
the instrument will automatically return to
the RUN Mode, except when in Zero
Offset, HOLD, or DIAGNOSTICS Modes.
CAUTION
OXYGEN WILL NOT BE MONITORED
The instrument will remain in HOLD or DI-
AGNOSTICS Modes until the operator re-
turns it to the RUN Mode or other
operation.
e. Preventing Unauthorized Access
The Model 7003M is equipped with a
security feature to prevent unauthorized
tampering with the instrument settings.
The instrument is shipped from the factory
with the security feature disabled. It can
be enabled or disabled at any time.
Security access is not required to:
• Display sensor data
• Acknowledge alarms
• Reveal security code
Security access is required to:
• Calibrate with span gas
• Access options and diagnostics
• Change operation parameters
• Enable or disable alarms and
ON/OFF-Control
• Disable or change the security code
After the security code is entered, the
operator can change any instrument
setting and can go back and forth to the
RUN Mode without having to enter the
code again.
If security is enabled, and the instrument
is left in the RUN Mode for five minutes,
security will automatically be re-activated.
Within this five minute period, anyone can
access the functions without re-entering
the security code.
f. Sensor Equilibrium
When a new sensor is installed, power up
the instrument and let the sensor stabilize
for about 5 hours before calibrating it.
If the oxygen sensor is calibrated at a
relatively high oxygen concentration, such
as with ambient air (typically 20.95%) and
then is exposed to a low oxygen level, a
longer equilibrium time period may be
required for the sensor to equilibrate.
This time period depends on the
monitoring concentration level and how
long the sensor was operated at the
higher level.