Servomex SERVOTOUGH Oxy, Operator'S Manual

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46
© Servomex Group Limited. 2020 01910001B_8
Sample gas
measurement
Pre-warning period
Flushing phase
Flushing phase
Inerting phase
Flushing phase
Auto calibration (high)
Auto calibration (low)
Inerting phase
Sample gas
measurement
Time
Initiate auto calibration
Service in progress (SIP)
status on
Route calibration gas 1
into the analyser
Route calibration gas 2
into the analyser
Route calibration gas 1
into the analyser
Route sample gas into the
analyser
Service in progress (SIP)
status off
Figure
23 -
Typical automa�c calibra�on sequence
5.15.3
Remote calibration or automatic validation/calibration
Switch inputs can be set to remote calibra�on mode (Remote cal), automa�c valida�on/calibra�on mode
(Auto val) or disabled so the inputs will have no func�on.
In Remote cal mode, switch input pins P108 1 and 2 ac�vate a transducer low calibra�on (as if the
request had been selected from the user interface) and switch input pins P108 3 and 4 ac�vate a
transducer high calibra�on. Switch input pins P108 5 and 6 ac�vate the transducer service in progress
(SIP) status, which must be closed before either calibra�on can be executed. Thi
s is to ensure a
calibra�on cannot be executed without a service in progress status being ac�vated. For example, to
carry out a remote low calibra�on:
Close pins 5
-6
Remote service in progress (SIP) on (latching switch)
Close pins 1
-2
Ac�vate low calibra�on (momentary switch)
Open pins 5
-6
Remote service in progress (SIP) off
A
calibra�on will be successfully completed if the current measurement is equal to the target
measu/
-
the auto valida�on tolerance values, See Figure
26
. If this condi�on
is not met a
Maintenance required status will be raised.