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Default Configuration
The Midas-M gas detector is factory-configured.
NOTE: Oxygen levels are 20.9% v/v in a normal atmosphere, equivalent to 17.3 mA. Use caution
when integrating an oxygen Midas-M 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.
Full Scale (FS)
Alarm 1
(Relay 1)
Alarm 2
(Relay 2)
Fault
(Relay 3)
Latching
Passcode
Address
Current source with:
1.0 mA
2.0 mA
3.0 mA
4.0 to 20.0 mA
21.0 mA
1
Not yet released
Midas-M
Factory Default Configuration
Toxic Gas
Typically 4 x Threshold
Limit Value (TLV)
1/2 TLV
Normally de-energized, energizes on alarm.
TLV
Normally de-energized, energizes on alarm.
Normally energizes, de-energized on fault.
Latching. Alarm and fault relays DO NOT automatically reset when reading
falls below alarm thresholds. Relays MUST be manually reset.
No Passcode set.
169.254.60.47 subnet mask 255.255.255.0
Fault
Inhibit
Maintenance Fault
Gas reading (normal operation)
Over range
1
flammable gas
100% Lower Explosive
Limit (LEL)
10% LEL
20% LEL
10
oxygen
25% Volume (v/v)
23.5% v/v (Rising)
19.5% v/v (Falling)
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