5-2 | Thermox TM2000 Oxygen Analyzer
Denitions
Calibration vs. Verication Operations
The Series 2000 control unit software refers to both calibration and verifi-
cation operations. During a verify operation, a calibration gas reading is
taken, and the difference between what the system records for the gas
value and its known value (from the gas cylinder) is recorded. Internal
calibration parameters are not changed. Verify operations are often used
to check that the instrument is running within required tolerances. During
a calibration operation, software algorithms adjust the difference between
the current readings and the known calibration gas values until they are
equal.
Span vs. Zero Gas
This chapter also refers to the terms span and zero calibration gases. The
span gas is the high calibration gas. The zero gas is the low calibration gas.
Types of Calibrations
The Series 2000 control unit allows you to perform automatic, remote, or
manual calibrations. Automatic and remote calibrations require a remote
calibration unit (RCU) that automatically switches the calibration gases,
and an auto calibration card installed in your control unit. Manual cali-
brations are performed without an RCU and you must switch the gases
manually.
Automatic Calibrations - Allows the system to calibrate itself. You define the
calibration gas values, the time each gas will flow through the sensor, and
the frequencies at which automatic calibrations will be performed (for
example, every four hours, every two days, etc.). The system will calibrate
itself at those predefined times. You can also use a digital input to activate
an automatic calibration or verification. See the “Remote Calibration Unit
Connections” section in the Installation chapter for help on how to use a
digital input to initiate an automatic calibration or verification.
Remote Calibrations - You define the calibration gas values but you interac-
tively determine how long each calibration gas should flow from the RCU
and into the sensor by pressing a key on the control unit.
Manual Calibration - You must physically switch the gases because you are
not using an RCU. However, you still define the calibration gas values.
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