Endress+Hauser Tankvision NXA820 - Sealing Tank Data and W+M Switch

Tankvision configuration
40
Sealing tank data
The tank data are sealed individually for every tank. The W+M values are selected under "Tanks ➝
Select the Tank (Select + Modify) ➝ Put Tank into Calibrated Status".
Sealing Tank Data
!
Note!
If the W+M switch is flipped, tanks can be removed from the calibrated status. This changes the
calibration checksum. Removing a tank from the sealed system is equivalent to a system
modification and must be accepted by an official from the Standards Authority.
Locking
The unit is locked by flipping the W+M switch on the Tankvision Tank Scanner NXA820.
L00-NXA82xxx-04-00-00-xx-002
A:Tankvision W+M Switch
Flipping the switch means that the settings checked under Section to "Sealing tank data" are fixed
and can no longer be modified, and that the values specified under "Sealing Tank Data" are displayed
as calibrated values by the computers specified under "PC Assignment". A master checksum is
calculated approx. 2 minutes after the W+M switch is flipped. This master checksum can be called
up under "System ➝ Tank Scanner Unit ➝ W&M Seal". After approximately 2 more minutes, the
system performs the first check calculation. The subsequent calculations are then performed every
8 hours.
The following information is displayed:
• Date and time the page was loaded
• W&M switch status
• W&M CRC at sealing time
• Last calculated W&M CRC
• Last calculated CRC’s time stamp
Tankvision W&M Seal
2 3
1
6
7
8
W &M
RESET
RESET
RESET
RESET
NXA Status
Relay
NXA Status
Relay
E
L+
L+
L-
6
7
8
3
2
1
Fuse
Fuse
POWER
POWER
10,5 ... 32V DC
10,5 ... 32V DC
2AT
2AT
10 11 12 13
10 11 12 13
MODBUS
MODBUS
A