sewerin EX-TEC PM 4 - LEL Range and % Vol. Range

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5 Maintenance
z Press and hold the release button on the test set until the con-
centration displayed on the device has reached a stable value.
z Press the On/Off key to conrm.
5.3.2 LEL range and % vol. range
Tools:
z Test head HG 4
z Test set (see Accessories)
Zero point test gas: Fresh air
Indication accuracy
test gas:
2.20 % vol. CH
4
for 50 % LEL adjustment
100 % vol. CH
4
for 100 % LEL adjustment
Setting the zero point
Tools are not required to set the zero point.
The zero points for the LEL range and the % vol. range are always
set together in one step.
z Switch on the device.
z Add fresh air as the test gas.
z Wait until the value on the LCD no longer ashes.
z Press the On/Off key to conrm.
Setting the indication accuracy
z Connect the device to the test set.
To do so, follow the steps indicated in the operating instruc-
tions for the tester.
z Place the test head on the device.
z Press and hold the release button on the test set for at least
1 minute. Do not let go of the release button until the concen-
tration displayed on the device has reached a stable value.
z Press the On/Off key to conrm.
z Remove the test head and wait until the zero point has reset
itself.