ChemDAQ Steri-Trac, Operation Manual

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The display will continue to show the real time gas reading whether the horn is acknowledged or not.
Latch
Enables configuration of the low level alarm and the High Level Alarm to latching or non-latching
status.
Latching means that once the alarm level is reached, the system will remain in alarm status even
if the gas concentration subsequently drops below the alarm level. In non-latching mode, the alarm
status goes away if the gas concentration drops below the alarm level. See Acknowledge section above
for further explanation.
Altitude
The response of most electrochemical sensors is proportional to absolute concentration (mg/l) and not
the relative concentration (% vol., ppm or ppb). The sensitivity, of the sensor, therefore depends on the
altitude of the monitor since the sensitivity is a function of atmospheric pressure. The altitude is usually
a one-time configuration setting that is made at the time of installation of the monitor. If the monitor is
not moved to a vastly different location, then the altitude need never be changed again. If the altitude is
not set, then the monitor will use the default value corresponding to sea level. The altitude can be
entered in feet.
CHANGING CONFIGURATION SETTINGS USING THE MAGIC BUTTON™
You can use the magic button to access the area monitor’s configuration menu. The following settings
can be changed using the magic button: Low alarm setting, high alarm setting, horn volume, and zero
adjust.
Adjusting the Low Alarm Setting Using the Magic Button:
Use this adjustment to choose the gas level in parts per million (ppm) when the low alarm will sound.
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 LALM displayed,
release the button.
3. Press and hold the button. The alarm setting will increase in value. Release the button when you
see the value you want. (To alternate between increasing or decreasing the setting, release the
button and then press and hold again .)
4. If the monitor detects no button presses for five seconds, the monitor will exit the configuration
menu, and then it will display in sequence the low alarm setting, high alarm setting, and the horn
volume. The monitor will then return to the main display. Your alarm level adjustment has been
saved.
Adjusting the High Alarm Setting Using the Magic Button:
Use this adjustment to choose the gas level in parts per million (ppm) when the high alarm will sound.