1.14
1.7.4 Auto-calibration 01100936
The analyser can be programmed to carry out an automatic calibration sequence. An optional
relay board is fitted which has relays to drive three solenoid valves for controlling the zero,
span and sample gases. The optional board comprises the relays only, it does not include the
solenoid valves, these must be obtained by the user.
The auto-calibration sequence may be initiated from the keypad or at preset time intervals
which are set by the user or by momentary closure of remote contacts. During the
auto-calibration sequence the diagnostic procedures in the software check the oxygen content
and response times of the zero and span gases. If any of these parameters are outside the
limits defined by the user an alarm is initiated and the sequence is aborted without recalibration
taking place.
During auto-calibration the analogue output signal may if required, be preserved at the last
measured process value. Up dating will recommence when the auto-calibration sequence is
completed, or aborted.
1.7.5 Measuring Cell Option
Two measuring cells are available, the standard type 325 which is suitable for most
applications and the type 364 which can be used with many solvents or corrosives.
Earlier analysers were supplied fitted with type 312 (standard) or type 313 (solvent resistant)
cells.
Materials of the analyser in contact with sample gases are as follows:
Standard Option
Cell Type: 325 364
Stainless steel 316 * *
Electroless nickel * *
Platinum * *
Pyrex glass * *
Viton *
PTFE *
PTFE elastomer *
The fitting of any cell except those shown above will invalidate certification.
The 1132 (1100H) transducer may be fitted with the 364 cell only.
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