2-7
signal is enabled, the output signal is 3.75 milliamps for the 4 to 20
milliamp output models.
NOTE: For oxygen sensors, the calibration signal will be 21 mA.
Oxygen can be set to a 3.75 mA calibration signal by turning
ON the ALERT option as described in the Ultima Controller
manual.
Calibration Kit
Calibration Kits are available for the Ultima X Gas Monitors. For the
recommended calibration kit, see Ultima Controller/Calibrator manual
(P/N 813379).
Ultima X Series Gas Monitor
Calibration Procedure
Read all calibration instructions before attempting an actual calibration.
Also, identify and become familiar with all of the calibration components.
During the calibration, it is necessary to quickly apply the span gas to
the unit. Prior connection of the calibration components will aid in the
ease of unit calibration.
The only true check of any gas monitor's performance is to apply gas
directly to the sensor. The calibration procedure must be performed
regularly.
NOTES:
• If this is the first calibration or, if the sensor element has been
changed or replaced, see Chapter 2, "Initial Calibration."
• If this is an oxygen sensor, see subsequent section, "Oxygen
Calibration."
• If this is an XIR sensor, see subsequent section, "XIR Calibration."
• Apply power to the unit at least 1 hour before calibrating.
• Due to the unstable nature of Chlorine Dioxide (ClO
2
), Chlorine
gas is used as a calibration simulant. If using the MSA calibration
system and gas cylinder (P/N 710331), the response ratio is 2:1. In
other words, the 2 ppm sample of Chlorine should be set to read 1
ppm of ClO
2
. The default value for the calibration gas on the ClO
2
Ultima X Series Gas Monitor is 1 ppm.
• For Cl
2
and ClO
2
calibration, do not mix regulators. Use only one
regulator for each of these gases. They will not work properly if
one regulator is used for multiple gases.
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