Dräger Polytron 8200, Инструкция по эксплуатации

Страница: 15 / 35

Calibration
Dräger Polytron 8200/8310 15
5.1.2 Span calibration
1. Check which gas category is set (only for DrägerSensor IR,
see also the Instructions for Use for the DrägerSensor IR).
1. Select Calibration > Span calibration and confirm.
2. Apply calibration gas (e.g., 50 % LEL methane).
The current value is displayed.
After the displayed value is stable:
3. Set the value to 50 and confirm.
4. Shut off the test gas and remove the calibration adapter
from the sensor or disconnect the hose.
5.2 Performing Auto Calibration
The device offers the option of an automatically sequenced
calibration. This reduces the number of otherwise manual
interactions with the device. The auto calibration is only
suitable for experienced users, as calibration errors can occur
here as a result of tightened procedures.
1. Select Settings > Sensor > Autocal. set. to enable or
disable the function.
2. Supply fresh air or feed nitrogen or compressed air at
a flow rate of 0.5 - 2.0 L/min to the sensor.
3. Select Calibration > Auto cal. and confirm.
{
Please wait... is displayed and a calibration of the zero
point is performed automatically.
{
After a successful zero point calibration, the span
calibration is started.
{
The calibration gas concentration, the units and, where
appropriate, the calibration gas are displayed and can
be changed.
4. Start the calibration with Next ; Back to menu aborts the
calibration.
5. Feed the relevant calibration gas to the sensor at a flow
rate of 0.5 - 2.0 L/min.
{
When the measured value is stable, the device performs
the calibration automatically.
{
After a successful calibration, the measurement and
the message Value OK? are displayed
6. When the measurement is stable, shut off the calibration
gas and wait until the measurement is below any possible
alarm thresholds again.
z
The calibration is performed again with Redo .
z
Complete the calibration with Accept value .
The device returns to the measurement mode.
NOTICE
Not all of the available sensors and gases support auto
calibration. If the function is not available, a manual
calibration must be performed.
WARNING
It must be insured that during the zero point calibration,
no measured gas is present in the supplied calibration
gas. Particularly with a fresh air calibration, Dräger
recommends performing a second, independent
measurement. Some sensors may only be calibrated
with synthetic air or nitrogen (observe the relevant
sensor data sheets).
NOTICE
After 10 minutes, without confirmation the device
reverts to measurement mode without performing
a calibration.
i i
!
i i