Ullage Readout - Honeywell 854 ATG Series Instruction Manual

3.3.6 Ullage readout

When an ullage reading is required, the two items shown below
must be changed.
The ullage value is also transmitted to the host via the 2-wire
Honeywell Enraf field bus (or optional RS-channel).
The ullage, or outage, measurement is referred to a 'zero' point at
the tank top (upper reference point).
The level, or innage, measurement is referred to a 'zero' point at
the tank bottom (datum plate).
Refer to figure
Note:
The high and low level alarms are "innage" alarms.
Hence a high alarm condition occurs when there is
a low ullage value and visa verse.
Item Name
W2= Protection level 2
UR= Upper reference
DE= Level type
EX Exit
Instruction manual 854 ATG
Description
Enter protection level 2 (default password: ENRAF2)
Format according to item LD.
The distance UR represents the distance from the 'innage' zero point
(datum plate) to the upper reference point at a dip hatch (or other point
at the tank top).
One character; either C, I or U.
C : for hydrostatic deformation compensated innage measurement
I : for innage measurement (default)
U : for ullage measurement
Exit protection level.
Commissioning
Figure 3.8 Upper reference value
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