3-2
3 Default Configuration
NOTE: Oxygen levels are 20.9% v/v in a normal atmosphere, equivalent to 17.3 mA. Use caution when
integrating an oxygen Midas unit using the 4-20 mA output since fault, inhibit, and no power conditions
are below 4 mA and, by default, an oxygen depletion alarm is triggered on a falling alarm (default 19.5%
v/v). In that case, Honeywell Analytics recommends one of the following:
• Use Modbus TCP digital communications
• Use discrete relay inputs instead of a 4-20 mA signal to trigger gas alarms
• Program the control system of the 4-20 mA input with logic and a delay (e.g., 1 second) before
triggering an alarm to determine if the 4-20 mA output is at one of the 0-4 mA conditions described
above.
Contact Honeywell Analytics for further information.
The Midas
®
gas detector is factory-configured as described in Table 3-1 on the following page.
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