Operation; Memory; Security; Units - Siemens OCM III Instruction Manual

OPERATION

Upon power up, the transducer is fired periodically as set by P36. A long interval
between measurements may be desirable in order to conserve power* when
operating the OCM-3 from a DC source of limited capacity.
The echo is processed to determine the head (D0). The flow rate (D1) is calculated by
the OCM-3 as a mathematical function (P3 and P4) of head or a function of head and
velocity (P42). The flow rate is then integrated to yield the totalized flow (D2). The
'Flow' and 'Total' fields which are displayed during the normal running mode (F2) are
also continuously updated.
Viewing or changing the content of a parameter (except F1, emulation) is done
without disturbing the acquisition, processing or logging of flow data (see \ Security).
*
restricted usage of display lighting (P14), relays (P15, 18 & 21), mA
output and communications will also conserve power.

MEMORY

During a power interruption, the memory back up will hold the programming, the log
and the totalizer values, and run the clock. The memory battery (B1) provides up to
one year of memory retention (see Appendices \ Maintenance).
Note: To save parameter values, return to RUN mode (F2) after programming.

SECURITY

The content of all 'A', 'D', 'F', 'P' and 'U' parameters can be viewed without having to
satisfy the security parameter, F0. However if it is desired to change the content of
any of these parameters, the security parameter must be satisfied (except for
resetting the running min/max displays, parameters D3/D4 and D6/D7).
Once security has been satisfied, access continues for 5 minutes after the last key is
pressed or until F2 is re-entered.
The security code may be changed from its factory set value, 2.71828, by entering a
new value into F10. It is imperative that the new value be recorded, as the code can
not be viewed. If the code is lost, consult Milltronics.

UNITS

Programming of the OCM-3 involves setting the units of measure:
» P1 linear and velocity
» P2 temperature
» P5 flow rate and volume
If the units are changed during the course of operation, the change will be effected
through all associated parameters and displays and will rescale flow and total data
stored in the logs.
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