3.4
Reference cycle
Internal drifts correction in an adjustable interval (standard: 1 hour, setting: SOPAS ET)
or per command (with SOPAS ET).
Measured value output during the reference cycle: Last valid measured value.
3.5
Check cycle
Check cycle = reference cycle + following check and output of the zero and check point
(70% of full scale value).
Start a check cycle via
•
Set interval (SOPAS ET).
•
Command via SOPAS ET.
•
External signal (optional).
Purpose of check cycle
■
Check of the zero point and a reference point for each component without feeding
test gases.
■
Meets the requirements of EN14181.
■
Replaces drift monitoring with test gases according to QAL3.
Zero point
An internal zero point reflector is swiveled in time-controlled in adjustable intervals. The
emitted light is reflected back in the sender/receiver unit to the detector, the zero spec‐
trum is evaluated with the calibration function and thus the zero points of all ducts
measured and output.
Signaling of maintenance request: Deviation from zero> ±2% of the FS.
Check cycle
An internal swivel element with two reference filters and an NO-filled cell is swiveled in
during the check cycle in addition to the zero point reflector and the reference value or
concentration value measured. These control values are scaled to 70% of the selected
measuring range.
Signaling of maintenance request: Deviation from setpoint value > ±2% of the FS.
3
PRODUCT DESCRIPTION
18
O P E R A T I N G I N S T R U C T I O N S | GM32-Ex
8015558/YYJ8/V1.7/2016-07 | SICK
Subject to change without notice
