Honeywell Enraf VITO Instruction Manual page 32

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Refer to figures 4.1 and 4.2
Item Name
Protection level 2
W2=
TD= Temperature dimension
MT= Element type
Number of elements
MN=
MO= Temperature element offset
RTD element position.
J0 – JD=
MI= Switch hysteresis
Product immersion depth
MP=
MG= Gas immersion depth
Temperature status conversion One character (default: 'T')
TU=
Exit
EX
Instruction manual VITO
Average temperature measurement with MPT / RTD
Description
Enter protection level 2
One character; either 'C' or 'F'. Default set to C.
C : degrees Celsius
F : degrees Fahrenheit
Both dimensions have the same format.
Three ASCII characters. Selects the element type connected to
the 762 VITO MRT Interface. For 1 – 3 RTD's and MPT probe,
set this item to: ' SPL ' (Pt100 large);
range : -200 ÷ +250 °C (-328 ÷ +482 °F)
Two ASCII digits. This item specifies the number of elements
of the MPT probe.
01 through 03 means RTD spot in a 3 wire connection
•
04 through 14 means an MPT probe.
•
Format according to item LD. The offset represents the distance
from the tank zero level to the lowest position of the MPT probe.
In case of the RTD spots this item should be left at 0.
Note:
In case of ullage measurement, distance MO is taken from
the upper reference point.
Format according to item LD. In case of the RTD spots items
J0 .. J2 represent the distance from tank zero level to the RTD
spot.
In case of a MPT probe items J0 .. JD represent the distance
from the bottom of the probe (nearest to tank zero level) to the
RTD elements. Refer to the description above to obtain the
values for J0 .. JD.
Note:
Only enter as much element positions as specified by the number
of elements, starting from J0 (see item MN).
Format according to item LD. The distance MI is a hysteresis
around the switching point of the temperature elements.
Format according to item LD. The distance MP specifies the
minimum required liquid level above a spot before it is selected
for the average product temperature calculation
Format according to item LD. The distance MG specifies the
minimum required distance below a spot before it is taken in the
average gas temperature calculation
This item is used to indicate the temperature status character in
case of a reduced or not guaranteed temperature accuracy. This
is the case when the temperature status is:
out of specified temperature range
•
last valid level used
•
manual level used
•
level below lowest temperature element
•
If required, this item can be set to another character.
Exit protection level 2
Page 30