Honeywell Enraf VITO User Manual

Average temperature measurement with VITO temperature probes
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Instruction manual VITO Page 8
2 Average temperature measurement with VITO temperature probes
2.1 Introduction VITO temperature probes
Honeywell Enraf’s portfolio for average temperature measurement consists of the following probes:
• 764 VITO temperature probe;
• 766 VITO water and temperature probe;
• 767 VITO LT temperature probe;
• 768 VITO LT water and temperature probe.
The 764 and 766 VITO temperature probes have 16 elements and the 767 and 768 VITO LT temperature probes
have 9 elements. These elements are thermocouples, and at the cold junction a highly accurate Pt100 resistor is
located to measure the absolute temperature. Hence, the thermocouples measure the temperature difference in
reference to the Pt100 reference resistor. The Pt100 reference resistor is located at 1 m (39”) from the bottom of
the probe, or, in case water probes are included, located app. 0.5 m (20”) above the water probe (see table 2 – 1).
Position 2 of 766/768
VITO combi probe
Model selection code
Water probe
length
Position reference element
(from the bottom of the
probe)
A 0.5 m (1’ 7”
11
/
16
) 1.0 m (3’ 3”
6
/
16
)
B 1.0 m (3’ 3”
6
/
16
) 1.5 m (4’ 11”
1
/
16
)
C 2.0 m (6’ 6”
12
/
16
) 2.5 m (8’ 2”
7
/
16
)
Table 2 – 1
Refer to figures 2.1 & 2.2.
1. The VITO MTT 764C probe comprises 16 measuring elements and has its lowest element (reference
element) positioned at 1 m (39”) from the bottom of the probe. Its 16 elements are subsequently equally
divided from the reference resistor up to the highest element.
2. The VITO MTT 764D probe comprises 16 measuring elements and has its lowest element positioned at
the bottom of the probe. The remaining 15 elements are subsequently equally divided from the reference
resistor (located at 1 m (39”) from the bottom of the probe) up to the highest element.
3. The VITO MTT 766C probe comprises a water probe & 16 measuring elements and has its lowest
element (reference element) positioned above the water probe (see table 2 – 1). Its 16 elements are
subsequently equally divided from the reference resistor up to the highest element.
4. The VITO MTT 766D probe comprises a water probe & 16 measuring elements and has its lowest
element positioned at the bottom of the probe. Its remaining 15 elements are subsequently equally
divided from the reference resistor positioned above the water probe (see table 2 – 1) up to the highest
element.
5. The VITO LT 767C probe comprises 9 measuring elements and has its lowest element (reference
element) positioned at 1 m (39”) from the bottom of the probe. Its 9 elements are subsequently equally
divided from the reference resistor up to the highest element.
6. The VITO LT 767D probe comprises 9 measuring elements and has its lowest element positioned at the
bottom of the probe. The remaining 8 elements are subsequently equally divided from the reference
resistor (located at 1 m (39”) from the bottom of the probe) up to the highest element.
7. The VITO LT 768C probe comprises a water probe & 9 measuring elements and has its lowest element
(reference element) positioned above the water probe (see table 2 – 1). Its 9 elements are subsequently
equally divided from the reference resistor up to the highest element.
8. The VITO LT 768D probe comprises a water probe & 9 measuring elements and has its lowest element
positioned at the bottom of the probe. The remaining 8 elements are subsequently equally divided from
the reference resistor positioned above the water probe (see table 2 – 1) up to the highest element.

Honeywell Enraf VITO Specifications

General

Brand	Honeywell
Model	Enraf VITO
Category	Temperature Controller
Language	English