Midas ® Gas Detector; Midas Calibration Procedure; Zero Calibration - Hardware Setup; Zero Calibration - Honeywell VA201T Calibration Handbook

Midas Calibration Procedure

Zero Calibration - Hardware Setup

Connect 1LPM regulator to Zero Air grade gas cylinder
Connect 'Tee' to regulator
Connect open end of 'Tee' to Midas
Be sure Midas
WARNING
NEVER force a sample into Midas, unit damage may result.

Zero Calibration

1. Use '▲' or '▼' to select zero calibration ' 0CAL' submenu and press '✓' to
accept.
2. Zero calibration icon starts flashing for user to prepare to apply zero gas.
3. Inhibit ' ' icon is also displayed indicating that no alarm outputs will be
generated during this process.
4. Press '✓' to confirm when ready and the icon goes steady.
5. Apply zero gas (or ambient air).
6. Dots on the left of the display indicate progress to a successful zero.
7. Display will show the zero gas reading and if measured to be stable for
an appropriate period of time will display 'PASS'.
8. If zero calibration is unsuccessful, display will show an error code (see table below).
9. Press '✓' to exit.
10. Press '▲' or '▼' to select another submenu.
11. Press 'X' to return to set-up, calibration and test menu selection.
12. Press 'X' again to return to normal operation.
NOTE
The change in the gas bottle icon's contents gives an indication as to the relative
STABILITY OF THE GAS READING 4HE ARROWS AND BARS INSIDE THE CYLINDER INDICATE
WHETHER IT IS RISING OR FALLING AS APPROPRIATE SEE TABLE AT RIGHT 
Code
PASS Successful Calibration
FL:0H Zero Calibration Timeout – Over Range
FL:0L Zero Calibration Timeout – Under Range
FL:0U Zero Calibration Timeout – Unstable
FL:SH Span Calibration Timeout – Over Range
FL:SL Span Calibration Timeout – Under Range
FL:SU Span Calibration Timeout – Unstable
Midas
®
inlet port
® in "Zero Calibration" mode
Code Meaning
Calibration Handbook
99
Tee
1 LPM
Regulator
Calibration Stability
Icons
Stable
Over - Range
Unstable - Rising
Unstable - Flat
Unstable - Falling
Under - Range