Checks
38
AVL 415SE Smoke Meter — Maintenance Guide
Connect your external measuring equipment to the SAMPLE 1 IN input.
1.
Press
START
on the AVL 4210 to initiate a filter paper feed and zeroing of
the pressure sensors. (The system is not under pressure and there is no
flow. The instantaneous differential and relative pressure signals are
assigned the value 0).
–
The prevailing ambient pressure is entered under the calibration
parameters.
–
The parameterized nominal volume (which in manual mode has to be
set in the measurement parameters) is drawn in and the sampled
volume displayed.
2.
Enter the prevailing externally measured ambient temperature (at the
external reference instrument) and the externally measured volume. The
volume measured by the AVL 415SE is recalculated for these ambient con-
ditions.
3.
Now compare the volume measured by the AVL 415SE (displayed on the
AVL 4210) with the volume measured by the external equipment.
4.
If the values differ by more than 3 %, save the correction factor in the
AVL 415SE by pressing
SAVE
on the AVL 4210.
3.1.2
Sampling Volume Check via Terminal
Information
The new correction factor shall be in the interval 0.7 … 1.3.
If the new correction factor is less than 0.7 or greater than 1.3, check the
metering pipe (see
Precision of calibration: typical approx. ± 10 ml or better.
Command sequence
SREM
1.
Switch AVL 415SE to REMOTE MODE
SVOP
2.
Start volume check.
AVKF V T
3.
Query command for volume correction factor
Important: both parameters
V
and
T
must be specified!
V
…
externally measured volume [ml]
T
…
externally meas ured ambient temperature [°C]
Response:
AVKF V
e
V
i
VKF
V
e
… externally measured volume [ml]
(same as first input datum)
V
i
… internally measured volume [ml]
referred to parameterized ambient pressure and input ambient tempera-
ture
VKF
… recalculated volume correction factor [-]
(3 decimal places)