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