41
Checks
AVL 415SE Smoke Meter — Maintenance Guide
The sampling volume (at ambient pressure and ambient temperature) can be
measured highly accurately with this method and virtually loss-free.
The Tester is used to check the volume of a sampling volume of 1000 ml.
The nominal volume has to be set to 1000 ml.
A read-off accuracy of
≤
1 mm = 4 ml or 0.4 % is possible.
Dry Gas Meter
3.2 Leak
Check
This function is used purely to check for leaks in the Smoke Meter's gas path.
•
Press
START
on the AVL 4210 Instrument Controller or enter command
SLEC
from the terminal to start the leak check:
–
The system initiates a paper feed and zero calibration of the pressure
sensors.
–
It switches to SAMPLING MODE and solenoid valve MV3 remains
closed.
–
The leak check is completed when "Ready" is displayed again on the
AVL 4210 or, when the text
SRDY
is returned in response to the
ASTZ
status query command via the terminal.
Fig. 34 Volume tester 408S for 415
Information
An officially calibrated dry gas meter can only deliver measurement accuracy
better than 1% when the flow is continuous.
To minimize the effect of the error that occurs at the start and at the end of the
measurement (i.e. when flow builds up and diminishes), we recommend carrying
out the volume check with a nominal volume of 20 000 ml.
Information
When using the Special Sampling Option of an AVL 415S-version with old
sample out box always perform the leak check in SERVICE MODE, otherwise in
standard leak check the error "Leakage extremely high" is output.