Honeywell Midas User Manual

Midas
®
Gas Detector
6-9
Table 6-4. Calibration menu overview.
Display Screen 1 Screen 2 Screen 3 Screen 4 Screen 5 Screen 6 Screen 7 Screen 8
Zero
0CAL
Icon flashes
alerting user
to prepare
to apply zero
gas
Unit is zeroing PASS is
displayed if
OK, fault code
displayed if
not.
Select inhibit state
after exiting zero cal
menu
Inh Y: set full inhibit
Inh N: keep initial
inhibit state
Set inhibit
timeout. Set
range is 00
(hour):00
(minute_
to 4:00.
Default is 30
minutes.
Span
SPAn
Set gas
ID code of
calibration
for multi-gas
sensors only
Select if humidified:
HUm
or dry: drY calibration
gas
Adjust value
to display
span gas
concentration
used
Display steadies and
displays span gas
reading, dots indicate
progress.
PASS is displayed
if OK, fault code
displays if not.
Set purging
time. Set
range is 0
min to 99
min. Default
is 3 min.
Remaining
purging time
in second is
displayed.
Select inhibit
state after
exiting cal
menu
Inh Y : set full
inhibit
Inh n : keep
initial inhibit
state
Set inhibit
timeout.
Set range is
00(hour):00
(minute)
to 4:00.
Default is 30
minutes.
Flow
FLoW
Icon flashes,
display shows
0 indicating
flow zero will
be set.
Unit counts down from
10 to 0 and sets flow
zero. Display shows
1st set point target
flow rate. Use s or
t to make reading on
external flow meter +/-
50cc/min of set point 1
Use s or t
to change
the flashing
display to the
actual reading
from the
external flow
meter
Unit counts down
from 10 to 0 and
sets 1st set point.
Icon flashes and
displays 2nd set
point target. Repeat
process to set.
4-20
mA
4-20
mA
4 mA is
displayed
indicating
analog output
should be 4
mA
Adjust until analog
output is
4 mA
Verify output with meter
20 mA is
displayed
indicating
analog output
should be
20 mA
Adjust until analog
output is
20 mA
Verify output with
meter

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