Instruction manual

Operation

36 Installation and Operations Manual

6.2.3.1 Software reliability

The software used in the 7500 series RTG, fulfills the requirements of OIML R85.

This particularly includes:

• cyclical test of data consistency

• non-volatile memory

• segmented data storage

The 7500 series RTGs continuously monitor the compliance with accuracy requirements

for custody transfer measurements according to OIML R85. If the accuracy cannot be

maintained, a specific alarm is generated on the local display and via the digital

communication (see »Display symbols« on page 34).

6.3 Local Operation

6.3.1 Locking configuration mode

The 7532 RTG can be protected in two ways against unauthorized changing of the device

data, numerical values, or factory settings:

Function “unlock parameter” (0A4):

A value <> 100 (e.g. 99) must be entered in “unlock parameter” (0A4) in the

“diagnostics” (0A) function group. The lock is shown on the display by the symbol

and can be released again either via the display or by communication.

Hardware lock:

The instrument is locked by pressing the keys at the same time.

The lock is shown on the display by the symbol and can only be unlocked again via

the display by pressing the keys at the same time again.

It is not possible to unlock the hardware by communication. All parameters can be

displayed even if the instrument is locked.

Table 6-6: Hardware Lock

and



press simultaneously



The LOCK_SYMBOL appears on the LCD

–

and