Chapter 5
Maintenance
General
The Toxgard II Monitor may be cleaned with a dry soft cloth and
requires minimal periodic maintenance to assure trouble-free
operation. However, the response to gas must be checked
regularly to assure the instrument is functioning.
NOTE: The only way to verify an instrument is functioning
properly is to perform a calibration test. This test
does not necessarily mean the unit must be
adjusted, but that it must be checked with ZERO
and SPAN gas, and observed for
acceptable readings
The more frequent the calibration tests, the greater the chances
for early detection of instrument failure resulting from instrument
component failure, damage or power loss.
Maintain a written log of instrument readings obtained during
calibration. Increase the frequency of calibration tests when the
sensor nears end-of-service life, or when abnormally high
variations with respect to the instrument log are observed.
The only routine maintenance item is the sensing element itself,
which has a limited lifetime. When the Toxgard II 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 Toxgard II Monitor is constantly performing a self-check.
When a problem is found, it displays the appropriate error code.
(Table 5-1, "Troubleshooting Guidelines"). When an error is
detected within the unit, the mA output signal falls to 0 mA.
• The "Change Sensor" indication is not an error and does not
affect the output.
Corrective Maintenance
See TABLE 5-1, "Troubleshooting" to identify an inoperative
assembly in the Toxgard II monitor; then, replace it according to
the following procedures.
Chapter 5, Maintenance
5-1
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