Average temperature measurement with VITO temperature probes
___________________________________________________________________________
Instruction manual VITO
Page 18
2.4.3 Temperature pointer (items VP and VV)
By means of the value pointer (item
VP
) a vector can be loaded to the HCU or ICU_HPI option board. Next, with
item
VV
, the selected data is returned. Item
VP
consists of 4 positions, in the middle separated by a ‘
.
’ or ‘
,
’ :
v w . x y (or v w , x y). The values for the value pointer are listed in table 2 – 4 together with the obtained data.
v w
,
x y
Selected data
Example / Dimension
0 0
0 0
0 0
0 0
0 2
0 2
:
0 2
0 2
0 2
0 2
0 2
0 2
0 3
0 3
0 3
0 3
0 3
0 3
0 3
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
,
0 0
0 1
0 2
0 3
0 0
0 1
:
1 5
2 0
2 5
2 6
2 7
2 8
0 1
0 2
0 9
1 0
1 1
1 2
2 0
HCU / ICU_HPI Emulation & Function
Emulation: MPU, HSU, HPU, HCU
Function: HC:
HART channel installed
AO:
analog output
ST:
spot temperature
MT:
VITO average temperature
WS:
external water bottom probe
WT:
VITO water bottom probe
PR:
pressure transmitters
Configuration boot code
Sales code option: C
boot code: 0A
J
2E
W
1A
X
12
Y
3F
HCU / ICU_HPI hardware version
Boot code software version
Calculated temperature of spot connected to CN1A-1 (floating point format)
Calculated temperature of spot connected to CN2B-1 (floating point format)
:
Calculated temperature of spot connected to CN5A-1 (floating point format)
Measured Pt100 resistance
(floating point format)
Standard deviation
(floating point format)
V
test
(floating point format)
Leak current I
1
(floating point format)
Leak current I
2
(floating point format)
Error counters HART addresses 3, 4 and 5
Error counters HART addresses 6, 7 and 8
(762 VITO: HART address 5; 762 VITO LT: HART address 6)
Detected HART device addresses
(5 for VITO Interface)
(6 for VITO LT Interface)
Initial detected VITO device type
Description: 764 : VITO temperature probe with 16 temperature elements
766 :
VITO water and temperature probe with 16 temperature
elements
767 :
VITO LT temperature probe with 9 temperature
elements
768 :
VITO LT water and temperature probe with 9
temperature elements
C :
lowest element is the reference element (with 764/767
probes: 1 m from the bottom of the probe; with 766/768
probes: above the water probe)
D :
lowest element at the bottom of the probe
PT :
Pt100
W :
water probe
Real active functions of VITO Interface (refer to description of VP=03,10)
Actual executed HART commands from 762 VITO Interface
Averaging constant 762 VITO Interface
(floating point format)
VV=HCU HCAOMT- - PR
VV=HCU CONFIG: 3F
VV=HW VERSION: 00
VV=BOOTSW VERS:01
according to item
TD
according to item
TD
according to item
TD
Ω
< 0.5E-10
V
A
A
VV=0000:0000:0013
VV= - - - - 5 - - - - - - - - -
VV= - - - - - 6 - - - - - - - -
VV=766 C PT W
VV=764 D PT
Table 2 – 4
Note:
With
VP
=03,10 and
VP
=03,11 an 864 MTT would be detected as: 764C, but then the lowest element (which is
the reference element) is located at the bottom of the probe.
Summary of Contents for Enraf VITO
Page 2: ......
