Model 580A
18
4. The reading stabilizes after 30 to 60 seconds of exposure to the test gas. This
response time may increase due to the presence of the Dust Guard, Splash Guard or
other sensor accessories.
5. If the sensor sees the gas, the read-out on the display flashes for as long as the
channel remains in the Calibration Check mode.
6. The operator should compare the reading with the gas concentration applied and
determine if it is necessary to calibrate the sensor.
7. Remove the gas and expose the sensor to clean air. If the gas is not removed within
6 minutes, the channel reverts to a fault condition.
8. If another channel needs to be checked press the
Channel/Select
button and repeat
steps 4 through 8 of this procedure.
9. Press the
Mode
button. The calibration level displays for a short time, and then the
channel exits out of Calibration Check mode.
NOTE:
Low and High alarms for checked channel are disabled during calibration check
mode. If an alarm happens on another channel, the alarm actuates and the gas
concentration of the alarmed channel displays.
3.5 Calibration Mode
NOTE
: For better results power up the sensor at least an hour before calibration.
To calibrate the Model 580A:
1. Make sure the calibration gas is the same concentration as the user specified
calibration level.
2. Make sure the sensor is seeing clean air.
3. Enter the Calibration mode by following the same procedure for entering the
Calibration Check mode. Press and hold the
Mode
button until the
CAL
LED
becomes steady, approximately fifteen seconds. When the
CAL
LED is steady,
release the
Mode
button. The display shows C1 as the channel being calibrated and
then flashing bars (
--
) for about 30 to 90 seconds. When the display changes from (
--
)
to
AC
, clean air calibration is complete. Channel C1
is now being calibrated at clean
air. To select channel C2 for calibration, use the Channel Select button.
4. Place the cup from the portable purge calibrator over the sensor.
5. When the channel displays
AC
, apply gas to the sensor. Watch the display changing
from
AC
to
CP
as the sensor detects gas. If the display does not change from
AC
to
CP
after six minutes, the channel returns to normal operation.
6. Wait for the display to change from
CP
to
CC
when the calibration routine is
complete. If the display indicates
F2
(failure to calibrate), remove the gas, close the
valve, and take the calibration cap off the sensor. Recalibrate the channel after 5
minutes.
