Emerson Process Management IM-106-910Xi Thermometer User Manual


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Xi Advanced Electronics
iv
Instruction Manual
IM-106-910Xi, Original Issue
November 2010
SYMBOLS
NOTE TO USERS
The number in the lower right corner of each illustration in this publication is
a manual illustration number. It is not a part number, and is not related to the
illustration in any technical manner.
OVERVIEW The Xi is specifically designed to control a zirconium oxide probe for
measuring oxygen, usually the O
2
remaining from a combustion process. Call
the Rosemount Analytical Customer Support Center (CSC) in Solon, Ohio, to
get recommendations for other oxygen probes. 800-433-6076 (US and
Canada).
The Xi electronics has several main functions:
1. Heater Control - The electronics receives a type K thermocouple input
from an O
2
probe and switches power on and off to the probe's heater in
order to maintain a temperature setpoint of 736 degrees C.
2. Signal Conditioning - The electronics receives the raw millivolt signal
from the O
2
sensing cell, then linearizes and amplifies the signal to
provide a linear 4-20 mA output signal used for recording or as an input
into a DCS system for control purposes.
3. Calibration - A bottled calibration gas of known value is typically flowed
into the probe's sensor to verify that it is reading correctly. If the signal is
out of calibration, the calibration gas is used to adjust the 4-20 mA
output signal. During calibration the Xi prompts the technician to flow
two calibration gases into the probe and, with the calibration gases
flowing, automatically adjusts the O
2
signal. With the addition of a Single
Probe Sequencer (SPS), the Xi electronics can also switch the
calibration gases on and off.
4. Diagnostics - Multiple alarms are available for display. The alarm
displays are intended to assist a technician in locating where an
instrument problem may reside.
The Xi electronics has been verified to operate the following probes:
• Westinghouse 218 and World Class
• Rosemount Analytical Oxymitter
• Yokogawa
RISKOFELECTRICAL SHOCK
WARNING:REFER TOINSTRUCTIONMANUAL
PROTECTIVECONDUCT OR TERMINAL
EARTH(GROUND) TERMINAL
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:
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