Honeywell Midas User Manual

Midas
®
Gas Detector
4-10
Diagram 4-6. Midas
®
terminal layout and identication
RJ-45
8
7
2
3
4
5
6
1
DC
PWR
+24 V
COM
NO
NC
Relay3
Relay2
Relay1
ON
SW
OFF
11
10
9
Analog Current
Loop 4-20 mA
INT EXT
EXT INT
-supply
J5
J4
+supply
J1
NO
NC
J2
NO
NC
J3
PYROLYZER
CONNECTOR
Relay1
}
Relay2
}
Relay3
}
See Relay
function
table below
Relays
are user
congurable
Note
The 3 relays onboard the Midas
®
unit can be controlled remotely from a separate controller system using
Modbus/TCP commands (or via LonWorks
®
if the optional interface is used). In this remote mode, the relays
cannot be controlled by the Midas
®
itself and only by the remote controller device (PLC, SCADA, etc.)
Display Description Relay 1 Relay 2 Relay 3
1FLt
Instrument Fault
Only
Alarm 1 Alarm 2
Instrument
Fault
2Flt
Separate Fault
Relays
Any Alarm
Maintenance
Fault
Instrument
Fault
CmbF
Combined Fault
Relay
Alarm 1 Alarm 2 Any Fault
nEtr
Remote control of
relays via Modbus/
TCP or LonWorks
®
Relays respond to Modbus or
LonWorks
®
holding registers only.

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