Honeywell Midas, User Manual

Page: 16 / 160

Midas
®
Gas Detector
3-3
Table 3-1. Midas
®
default configuration
Current source with:
1.0 mA Fault
2.0 mA Inhibit
3.0 mA Maintenance Fault
4.0 to 20.0 mA Gas reading (normal operation)
21.0 mA Over range
Toxic Gas Flammable Gas Oxygen
Full Scale (FS)
Typically 4 x Threshold Limit
Value (TLV)
100% Lower Explosive Limit
(LEL)
1
25% Volume (v/v)
Lowest Alarm Level (LAL) Typically 1/2 TLV 10% LEL 5% v/v
Alarm 1
(Relay 1)
1/2 TLV 10% LEL 23.5% v/v (Rising)
Normally de-energized, energizes on alarm.
Contact Normally Open (NO), closes on alarm.
Alarm 2
(Relay 2)
TLV 20% LEL 19.5% v/v (Falling)
Normally de-energized, energizes on alarm.
Contact Normally Open (NO), closes on alarm.
Fault
(Relay 3)
Normally energized, de-energizes on fault.
Contact Normally Open (NO). Instrument Fault Only
Latching
Latching. Alarm and fault relays DO NOT automatically reset when reading falls below alarm
thresholds. Relays MUST be manually reset.
Pass code No pass code set.
IP Address 169.254.60.47 subnet mask 255.255.255.0
1
Midas ®
detectors are not ETL approved for monitoring in or sampling from classified areas above 25% LEL
See Table 7-3 for more information on Relay Configuration