Technical data

-18-
In the standard service menu the display shortly reads fAiL and then the current value (step
2).
4. For leaving menu point SCAL press key
QUIT
MENU
briefly.
5. If necessary, store the parameter (SAUE).
Notes:
The EC-Type Examination Certificate BVS 05 ATEX G 001 X is only valid for a detection range
with a full scale of 100 % LEL resp. 4.00 %Vol. NH
3
.
If the full scale value is changed from 100 % LEL to a different value, the function test becomes
invalid.
The change of the detection range is mainly a change of the current output. The standardized output
signal of 4 – 20 mA is used for the new, reduced detection range. The display indication does not
change. A detection range of 0 – 50 % LEL results in the figures from 0 to 50.0 in the display (i.e. the
reading remains at % LEL).
Overrange and underrange refer to a percentage of the detection range, i.e. with a detection range of
0 – 50 % LEL the ambiguity alarm is triggered at approx. 56 % LEL ! Alarm thresholds are indicated
in % LEL (not in % of detection range) !
After a reduction of the detection range make sure that the alarm thresholds are checked and, if
necessary, corrected. If alarm thresholds were adjusted to a value beyond the new full scale
deflection, they are automatically set to the current full scale value.
Should the circuitry recognize that the currently set detection range cannot be monitored any longer
(sensor too sensitive for the measurement circuit, see also SCAL ERR.), the display turns
automatically to the highest possible value when entering this menu point.
Menu point AM"B. – Adjustment of the automatic reset of the ambiguity alarm (only possible in
extended menu)
1. Activate menu point AM"B.
2. The display reads the presently set status (oN or oFF).
This display can also be retrieved in the standard service menu.
3. Use keys
ZERO
TEST
and
SPAN
INFO
for setting the parameter.
In the standard service menu the display shortly reads fAiL and then the current status (step
2).
4. Press key
QUIT
MENU
briefly to leave menu point AM"B. .
5. If necessary, store the parameter (SAUE).
!
For the proper functioning of the automatic reset of the ambiguity alarm
the zeropoint adjustment of the CC28 must have been done correctly.
Notes:
This function is only active for the gases methane, propane and hydrogen. Should adjustment
AM"B. oN be selected, but none of the above gases is measured, the display order does not include the
reading AM"B. after pressing the info key.
The activation of the automatic reset is blocked until the next zeropoint adjustment, if the sensor has
been replaced or if the type of gas has been changed in the extended service menu !
As Info the display reads: AM"B. -oN- instead of AM"B. oN.