Honeywell Midas Quick Start Guide

7
3. Electrical Installation
Access for the electrical wires to the terminal module is made via the PG16 cable
gland located at the bottom of the mounting bracket assembly. The cable gland can be
removed and replaced with a suitable conduit fitting if required. The wire routing of a
typical installation is shown in the diagram below.
Diagram 4. Simplified Schematic Diagram 5. Wiring Diagram
4-20mA
Analog Output
Terminals
Relay
NO/NC
Jumpers
Relay Contact
Terminals
Power Switch
Ethernet Cable
Cable Gland
The terminals used are suitable for conductors of 24 to 14 AWG (0.5 to 1.8mm Dia.).
The use of 16 AWG (1.5 mm Dia.) conductors is recommended.
If Power over Ethernet (PoE) is used to power the device, then 24 VDC power must not
also be connected to the device, (or conversely if 24 VDC is used to power the Midas
®
,
then electrical power via the Ethernet port must not be applied). Failure to observe this
requirement may cause damage to the gas detection system and will not be covered by
the standard warranty.
When connecting the wires ensure that the power switch is in the off position.

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