Honeywell Midas User Manual

Midas
®
Gas Detector
3-3
Table 3-1. Midas
®
default conguration
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 classied areas above 25% LEL
See Table 7-3 for more information on Relay Configuration

Honeywell Midas Specifications

General

Power Supply	24 VDC
Detection Technology	Electrochemical, Infrared
Sampling Method	Diffusion
Display	LCD
Communication	Modbus RTU, 4-20mA
Operating Temperature	-20°C to +50°C
Humidity Range	0% to 95% RH (non-condensing)
Target Gas	Multiple gases
Response Time	< 30 seconds
Operating Humidity	0% to 95% RH (non-condensing)
Outputs	4-20mA
Protection Rating	IP66
Certifications	ATEX, UL, CSA
Detection Gases	Oxygen (O2), Carbon Monoxide (CO), Hydrogen Sulfide (H2S), Methane (CH4), and others