Honeywell Midas User Manual

Midas
®
Gas Detector
10-3
Diagram 10-2. LonWorks Cable Gland.
10.1.2 Wiring the Midas
®
for LonWorks
®
Wiring Diagram
Plug 2
Plug 1
Pwr +24 VDC
Lon A
Lon B
Pwr Common
Pwr +24 VDC
Lon A
Lon B
Pwr Common
Wiring Notes:
1. Maximum wire size is 16 AWG.
2. Input voltage range is 20.4 to 26.4 VDC. Midas
pyrolyzers and transmitters with LonWorks
modules have a restricted minimum voltage
requirement of 21.6 VDC.
3. It is mechanically possible to misalign Plug1
and Plug2. Care must be taken when inserting
plug to assure correct alignment.
4. Plug1 and Plug2 are internally connected in
parallel to facilitate wiring in bus topology.
5. LonWorks
®
FT-10 wiring is polarity sensitive.
Lon A and Lon B may be swapped.
10.1.3 Configuring the Midas
®
for LonWorks
®
1. Turn on 24 VDC power.
2. Confirm that the Midas
®
initiates the power up
sequence.
3. Reset Fault F49 if present.
4. Set alarm levels and other parameters as
desired.
5. Confirm that the Midas
®
IP parameters are at
default values. If changed, the DHCP client
must be set to ‘n’. The IP address must be
restored to 169.254.60.47 and the subnet
mask must be restored to 255.255.255.0

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