Honeywell Enraf VITO, Instruction Manual

Page: 15 / 52

Average temperature measurement with VITO temperature probes
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Instruction manual VITO Page 13
Item Name Description
W2
= Protection level 2 Enter protection level 2
TD = Temperature dimension One character; either ‘C’ or ‘F’. Default set to C.
C : degrees Celsius
F : degrees Fahrenheit
Both dimensions have the same format.
MT = Element type Three ASCII characters. Selects the type of element connected
to the VITO Interface. For VITO probes, set item
MT
to: ‘ SPL ’.
MK = Sensitive length temperature Format according to item LD (default: +030.000)
probe Refer to the above description about the sensitive length of the
VITO temperature probe. Enter that value in item MK .
MO
= Temperature element offset Format according to item
LD
(default: +000.0000).
Item MO represents the distance from tank zero (datum plate) to
the lowest element (spot) in the sensor. Refer to the above
description about the offset to bottom of probe and add to this the
distance: tank zero - bottom of probe.
MI = Switch hysteresis Format according to item LD (default: +000.1000 m)
The distance MI is a hysteresis around the switching point of the
temperature elements.
MP = Product immersion depth Format according to item LD (default: +000.5000 m)
The distance MP specifies the minimum required liquid level
above a thermocouple before it is taken in the average product
temperature calculation.
MG = Gas immersion depth Format according to item LD (default: +000.5000 m)
The distance MG specifies the minimum required distance below
a thermocouple before it is taken in the average gas temperature
calculation.
WP = Water probe length Format according to item LD (default: +001.0000 m)
The water probe length is required to calculate the position of the
reference element. Refer also to section 4.1.
If no water probe is present, set item
WP
to zero (+000.0000).
MJ = Temperature distribution One character (default: ‘F’)
This item is used to enable/disable the lowest element close to
the bottom of the probe (in the probe models 764
D
/766
D
/767
D
/
768
D
) from average product temperature calculation. Valid from
HCU/HPI software version A1.8 and higher.
F : lowest element disabled for average temp. calc.
C : lowest element enabled for average temp. calc.
TU
= Temperature status One character (default: ‘T’)
conversion 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
•
exceeding differential temperature range
•
last valid level used
•
manual level used
•
level below lowest temperature element
If required, this item can be set to another character.
EX
Exit Exit protection level 2.