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The zero-adjust function should only be performed when there is
no target gas present
in the
area. Do not perform the zero adjust function, for example, while sterilizers are in operation.
After a calibrated sensor has been installed,
wait two minutes
before performing the zero-
adjust function. This allows time for the sensor to settle. Even if the monitor is reading
0.0ppm, you should perform the zero-adjust function.
The zero-adjust function is performed after a calibrated sensor has been newly installed. Once the sensor
has settled,
and there is no target gas in the area,
perform the zero-adjust function- even if the monitor
is reading 0.0ppm. This corrects the reading to compensate for environmental factors.
Instructions for performing the zero-adjust:
Note: Once you enter the configuration menu, if the monitor detects no button presses for five seconds,
it will exit the menu and return to the main display.
1.
To enter the configuration menu,
press and hold
the Magic Button™ until you see MENU on the
main display. Then
release
the button.
2.
Press and hold
the button to cycle through the sub menus. The display will repeat cycling
through the sub menus as long as you hold down the button. When you see ZERO displayed,
release
the button.
3.
With ZERO displayed,
press the button once
. The monitor will go through its zero-adjust
function and will flash in green Z0.0.
4.
After a few seconds, the monitor will display in sequence the low alarm setting, high alarm
setting, the horn volume, then it will display Z0.0.
If the Z0.0 is GREEN, the zero adjust was
successful. (If the Z0.0 is RED, the zero-adjust was NOT successful.
Call your ChemDAQ
service representative.)
5.
The monitor will then return to the main display.
MAINTENANCE
:
Calibration
Why Calibrate the monitor?
The Steri-Trac monitors require periodic calibration as do all gas detection monitors. Calibration serves
two basic functions, the first of which is to periodically check the sensor to make sure that it is
functioning correctly. The second role of calibration is to adjust the output of the monitor so that it
accurately reflects the actual gas concentration that the monitor is exposed.
Calibration involves the application of a known concentration of test gas to the sensor and measuring the
response from the sensor. The correct function of the sensor is verified by checking that the response
characteristics fall within the specifications for that sensor module. The sensor response is then used to
calculate a calibration coefficient which is written to the EEPROM memory in the sensor module. When
the sensor module is installed in the Steri-Trac monitor body, the monitor uses this calibration
coefficient to adjust the digital gain of the monitor so that the display reading reflects the actual gas
concentration.
Summary of Contents for Steri-Trac
Page 3: ...3...
Page 22: ...22 SPECIFICATIONS...
