Chapter 4
Maintenance
General
The only routine maintenance item is the sensing element itself,
which has a limited lifetime. When the Ultima Gas Monitor’s
read-out indicates that the sensor must be changed, there is very
little sensor lifetime remaining. It is good practice to obtain a
replacement sensing element before the sensing element within
your unit becomes inoperative.
The Ultima Gas Monitor is constantly performing a self-check.
When a problem is found, it displays the appropriate error code.
(TABLE 4-1, "Troubleshooting Guidelines"). When any of these
errors are detected within the unit, the output signal falls to its
lowest possible output.
• For frequency output units: lowest possible output is 0 KHz
• For 4 to 20 milliamp output models: lowest output is <3.75 mA
• The "Change Sensor" indication is not an error and does not
affect the output.
Replacing the Sensor
Typically, the Ultima Monitor LCD display shows a maintenance
message when the sensor is due for replacement (FIGURE 4-1).
Hydrogen Cyanide and Hydrogen Chloride Sensors
NOTE: This NOTE and the following CAUTION apply to the
Ultima Series sensors for Hydrogen Cyanide (HCN)
and Hydrogen Chloride (HCL) only.
Figure 4-1.
Change Sensor Flag
Chapter 4, Maintenance
4-1
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