Technical data

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3. After correct entering the display shows alternating the current measurement value and the
reading ZERo. When the measurement value remains constant for a defined time interval, the
display changes to read ZERo and ADJ for a few seconds, and the hardware internally
regulates its zeropoints. Once the regulation is completed successfully, the new zeropoint is
set, the AutoCal program is automatically terminated with the display reading SAUE, and the
transmitter returns to detection mode.
Notes:
If the current measurement value is beyond the allowed tolerances for the relevant access code, the
display reads fAi L shortly in step 3, and the transmitter returns to detection mode.
The AutoCal program can be shortened by long-term pressing key
ZERO
TEST
or the AutoZero key, while the
measurement value is checked for constancy. Then the hardware starts to regulate/adjust the zeropoint
directly.
For leaving the AutoCal program without zeropoint adjustment, press key
ZERO
TEST
or the AutoZero key
briefly. The display shortly reads ESC.
!
Once the quick adjustment is completed, remember to screw the lock screw
and its gasket in again to its stop!
The following error message may occur during zeropoint adjustment:
Display Meaning Fault LED
CAL
ERR.2
Gas signal is unstable.
CAL
ERR.3
Zeropoint is beyond the allowed tolerance
range.
flashing
quickly
All error message have to be confirmed with
QUIT
MENU
or with the AutoZero key at the left side of the
casing. After confirmation the transmitter returns to detection mode without zeropoint adjustment.
Check and AutoCal Adjustment of Sensitivity (SPAN)
For calibration of a transmitter without display you need the remote control RC2.
Press key
SPAN
INFO
briefly to read the currently set calibration gas concentration as % LEL (for ammonia
as Vol.%) of the parameter (CLMAS). The value of the test gas concentration should, if possible, be
20% above the main alarm threshold.
!
Many combustible gases are also toxic. Handling toxic gases requires special
safety precautions.
TLVs give hints for hazards caused by toxic gases. For particularly toxic matters,
e.g. benzene or ethylene oxide, a reference gas is recommended for calibration.
For checking, resp. adjusting the display sensitivity (span) a calibration adapter has to be attached to
the sensor holder. Via this adapter the calibration gas can be supplied to the sensor at atmospheric
pressure with a flow of approx. 0.5 l/min., while the display has to be observed. Is there a deviation
between the displayed value and the actual calibration gas concentration a span calibration is
necessary. If the reading is constant the adjustment can be done using the AutoCal feature. The
AutoCal program automatically adjusts the measuring signal to the calibration gas. Follow the order
below:
→ Before a calibration is started, make sure that the sensor is free from calibration gas
(display 0).