Ametek Thermox 2000 ATEX Series User Manual page 141

Calibration gas time inadequate
If you are having problems running an auto calibration, you may not have
allowed the calibration gases enough time to flow through the sensor and
stabilize. To correct this problem, select the Inject Cal Gas option from the
Calibrate key menu. Turn on each calibration gas and determine how long
it takes for each gas to stabilize on the control unit display. Then add a one
minute buffer to each of these times. Also make sure the cylinder regula-
tors are set to the correct pressure. See the Flow Section of the System
Interconnect Drawing for the system flow and pressure requirements. This
drawing is included with your Installation package.
Select the Cal Gas Duration option from the Calibrate/Set Cal Timers
menu to set calibration gas times.
If performing a manual calibration, ensure that you are waiting for
the reading to stabilize on the display before switching to the next
NOTE
calibration gas. You should wait a minimum of two minutes.
Maintenance and Troubleshooting | 6-13