Technical data

BKI 09 ATEX 0003X  htk4014a0600p_01.doc  47 / 80
Setting up a volume table - (User menu PCSTAR 2 function 1.7.2 (HART® submenu 2.1.7))
To be able to measure the volume, a conversion table (strapping table) will need to be created using the PCSTAR 2 program or the HART® communicator.
The strapping table assigns defined volumes to the various levels.
In the case of non-symmetrical tanks, e.g. tanks with dished bottom, the accuracy of volumetric measurement will depend on the number of entered “level/volume
pairs”. The maximum number of pairs (points) that can be set is 20.
The volume is linearly determined (interpolated) between 2 points.
The conversion table is generally used for volume, but can also be used for mass and flow.
Five points have been set in the following example.
Example procedure 3: creating a strap table by assigning a volume to a user-defined level (using PCSTAR 2)
Step Action Data entered/value selected
1 Connect to the gauge as described in section 3.3.1. n/a
2 Press function key F2 or left click on F2-connection at the bottom of the window. This will open the user
configuration menu.
n/a
3 Go to user function 1.1.1: Tank height to enter value
(click on field and type in value)
6.00 m
4 Go to user function 1.1.2: Dead zone to enter blocking distance value. 0.40 m
5 Go to user function 1.1.6: Probe length to enter value 5.80 m
6 Go to user function 1.2.4: Length Unit to select length units. m or ft
7 Go to user function 1.2.5: Volume unit to select volume units m³ or ft³
8 Go to user function 1.7.2: Input table. A maximum of 20 points can be entered. For each point a level and a volume
must be entered. Each point should have a value higher than preceding one.
See table below
Input table
Point Level Volume
1 0.0 m 0.0 m³
2 0.20 m 0.5 m³
3 0.75 m 1.0 m³
4 1.00 m 1.5 m³
5 5.60 m 16.8 m³
* Max. level = tank height – dead zone = 6000 mm – 400 mm or 19.69 ft – 1.31 ft
= 5600 mm or 18.37 ft, equivalent to a volume of 16.80 m³ or 593.3 ft³
Note:
The level can effectively be measured between 200 mm or 8” and 5600 mm or 18½ ft. When the product level drops below the tip of the probe, the MicroTREK 2-wire
will indicate that there is still remains of 200 mm or 8”. Accordingly, the MicroTREK 2-wire can only indicate a level between 200 mm or 8” and 5600 mm or 18½ ft,
since it only measures along the probes. The size of the dead zone depends on the installation and on the probe type.