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8009389/YN39/V3-0/2015-08| SICK OPERATING INSTRUCTIONS|GM35
Subject to change without notice
PRODUCT OVERVIEW
2.2.3 Automatic check cycles
To ensure a consistently high level of measuring precision, the GM35 SR-unit performs a
regular automatic check cycle in an adjustable interval (standard: Every 2 hours). In this
check cycle, the zero point is first determined by swiveling a zero point reflector into the
beam path. Reference filters are then moved into position to control the check point. The
spectral properties of the device are checked using a test gas cell. If a check cycle reveals
that the system is not functioning in accordance with the operation specifications, the
GM35 measuring system outputs appropriate error or warning messages.
Triggering options
1 Di 1 (falling edge): The check cycle can also be suppressed with this function.
2 Time interval, adjustable via the menu of the EvU.
Sequence
1 Check cycle is started.
2 Internal reference measurement is executed. Signal: Relay 3 (function check)
3 The zero point and check point are output on the EvU display and the assigned analog
outputs for 90 seconds each. Relay 3 remains active.
Fig. 7: Determining the check point
Observe the following for connecting to an emission computer: Measure the
time from the start to the output to compensate differences in the device
settings.
Measure
Zero point
Check
Zero point
Check point
(70% fsc)
Zero point reflector
Swivel element
Data recorder
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