Model 580A
17
NOTE:
A channel’s sensor detects a gas concentration in excess of an alarm set point.
The associated alarm outputs will activate. After a few moments, the gas
concentration drops below the alarm set point. If the alarm outputs are latched,
the operator can press the
Reset
button and the latched alarm outputs will return
to their normal (safe) state.
3.4 Calibration Check Mode
To perform a calibration check, use the following procedure:
•
Place the cup from the portable purge calibrator over the sensor.
Figure 7: Portable Purge Calibrator
NOTE:
The Calibration Check mode cannot be entered if the unit is in alarm.
1. Enter the Calibration Check mode by pressing and holding the
Mode
button until the
CAL
LED flashes (about ten seconds). The unit displays the calibration level. When
the
CAL
LED flashes, release the
Mode
button. The channel is now in the Calibration
Check mode.
2. When the Mode button is released, the display flashes a pair of bars (
--
) for about ten
seconds. After that “
C1
” or “
C2
” displays for a short time indicating which channel is
being checked. The channel’s LED is flashing. To select another channel press the
Channel/Select
button.
3. When the display flashes digits, for example “
0
”, apply the test gas to the sensor
(open the ON/OFF valve on the cylinder) and wait a few seconds. The display begins
to go up scale as the sensor sees the gas. If no gas is applied, the unit returns to the
normal operating mode after 6 minutes.
