Default Configuration - Honeywell Midas S2 User Manual

1.8 Default Configuration

The Midas S2 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 S2 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 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 for further information.
TABLE 1 -1: Factory Default Configuration
Full Scale (FS)
Alarm 1
(Relay 1)
Alarm 2
(Relay 2)
Fault
(Relay 3)
Latching
Passcode
Address
Current source with:
0 mA
1.0 mA
2.0 mA
3.0 mA
4.0 to 20.0 mA
21.0 mA
1
Please contact Honeywell sales.
*LIT is disabled as it is an optional function.
Midas S2
Toxic Gas
Typically 4 x Threshold Limit
Value (TLV)
Typically 1/2 TLV
Normally de-energized, energizes on alarm.
Typically 1 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.
192.168.0.14 subnet mask 255.255.255.0
Fault (open circuit)
Fault
Inhibit
Maintenance Fault
Gas reading (normal operation)
Over range
Flammable Gas
100% Lower Explosive Limit
(LEL)
10% LEL
20% LEL
10
1
Oxygen
25% Volume (v/v)
23.5% v/v (Rising)
19.5% v/v (Falling)
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