Commissioning; Parameter Protection Against Unauthorized Access - Elster 2 Series Commissioning And Maintenance Instructions

Commissioning

3 Commissioning
This chapter briefly describes the most important aspects of commissioning gas-
net flow computers.
All parameters are listed in the annex to the first volume of the Flow Computer
gas-net F1 documentation.
3.1 Parameter Protection against Unauthorized
Access
The functionality of a gas-net F1 can be completely configured via a parameter
data record. Unauthorized persons must therefore be prevented from changing
these parameters. In order to guarantee this protection, the device is provided
with a two-level security system consisting of the Calibration lock (official
safeguarding) and the Locks (user locks, password protection).
3.1.1 Calibration Lock
The calibration lock physically consists of a sealable rotary switch on the front of
the device. Open the calibration switch by turning it anticlockwise as far as it will
go. For additional safeguarding, the device generates hint H800: Calibration lock
open when the calibration switch is open.
Opening the calibration switch enables the operator to access all device
parameters.
3.1.2 User Lock
The user lock consists of one (numerical) lock for each of the two contract
parties and is implemented via the software. This means that the locks are
defined by the device parameterization and opened or closed via the operator
panel. Open locks allow the user to access specific parameters or actions that
are editable directly at the device. All parameters being subject to the user locks
can be modified when both locks are or the calibration switch is open.
gas-net F1
3
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