Honeywell Midas User Manual

Midas
®
Gas Detector
4-14
4-20 mA
Controlled
Current Source
Internal
Power
Loads
J4
INT EXT
J5
EXT INT
11
10
9
MIDAS
Simplified Internal Schematic
2
1
-
+
Sieger System 57
Relay/Field Interface Card
05701-A-0326
05701-A-0327
05701-A-0328
05701-A-0329
05701-A-0330
System 57
Relay/Field
Interface Card
5701 Control Card
+
24
VDC
-
27
29
28
Sense
Resistor
~170 ohm
Cabinet
29
28
27
Shielded Cable
Transmitter
Supply
5701 Card
Sensor Drive Module
Link Positions
LK12
LK5
LK6
LK7
LK8
LK9
LK10
LK11
LK1
LK2
LK3
LK4
LK13
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
}
Diagram 4-13. Midas
®
to 5701 3-Wire Sinking Connection

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