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CONSTRUCTION AND FUNCTION
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Disturbance totalizers
Disturbance totalizers (V
available for V
conditions. During this time, the main Vb totalizer is at a standstill. When "Alarm run" mode has
been activated, the main totalizers will always run and the disturbance totalizers will start to run if
there is an alarm.
10
Time system
General
The EC 900 has been equipped with a time system which fulfils not only PTB requirements but also
international requirements.
This includes in particular a programmable change to summer or standard time.
Rules for changing time
The rules for changing the date and time are stipulated in PTB Requirement PTB-A 50.7.
PTB telephone time service
In Germany, time synchronization through the PTB telephone time service is required in conjunction
with remote data transmission.
In other European countries, comparable authorities offer equivalent services.
If there is no telephone time service available, time synchronization has to be performed via an al-
ternative synchronization input (alternatively: software/serial interface or contact input).
Operating parameters for controlling time and date
The following operating parameters are required for the time system:
1. Length of the measuring period
2. End of the billing day (e.g. 6 o'clock)
3. End of the billing year (e.g. September)
4. Time change yes/no
5. Time zone
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and V
) are available for V
mD
bD
. These disturbance totalizers run as long as the gas volume corrector is under fault
o
and V
. There is no disturbance totalizer
m
b
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