Average temperature measurement with VITO temperature probes
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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)
Vtest (floating point format)
Leak current I1 (floating point format)
Leak current I2 (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.
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