118_4416655_Rev06

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Introduction VITO Interface and average temperature probes ___________________________________________________________________________ 1 Introduction VITO Interface and average temperature probes An average temperature probe is to be connected to the Honeywell Enraf 762 VITO Interface unit. In turn, the 762 VITO Interface unit is connected to the Honeywell Enraf level gauge. A water bottom probe can be integrated in the average temperature probe (combi probe). Figure 1.1 Average temperature probe / VITO Interface configuration There are three types of VITO Interface units; each for a specific type of average temperature probe: • 762 VITO MTT Interface for: - model 764 VITO average temperature probe, or - model 766 VITO combi probe (average temperature probe with integrated water probe), or - model 765 VITO water probe. • 762 VITO LT Interface for: - model 767 VITO LT average temperature probe, or - model 768 VITO LT combi probe (average temperature probe with integrated water probe), or - model 765 VITO water probe. • 762 VITO MRT Interface for: - MRT temperature probe (Multiple Resistance Thermometer), or - MPT temperature probe (Multiple Pt100 spot Thermometer), or - 2 to 3 individual wired spot elements. Instruction manual VITO Page 6
Introduction VITO Interface and average temperature probes ___________________________________________________________________________ The 764 and 766 VITO temperature probes have 16 elements. These elements are thermocouples, and at the cold junction a highly accurate Pt100 resistor is located to measure the absolute temperature. The 767 and 768 VITO LT temperature probes are similar to the 764 and 766 temperature probes, but only have 9 elements. An MRT (Multiple Resistance Thermometer) or Variable Length Thermometer comprises a number of resistance elements of different lengths, all starting close to the bottom end of the temperature probe. An MPT probe (Multiple Pt100 spots) consisting of 1 through 14 RTD's with 2 common ground wires. More information about the different temperature probes can be found in the introduction section of chapters 2, 3 and 4. The Honeywell Enraf level gauge must be equipped with a suitable option board to receive the signal from the 762 VITO Interface: • HCU option board for Honeywell Enraf 854 servo level gauges and 877 FDI; • ICU_HPI option board for Honeywell Enraf 97x SmartRadar level gauges • FII-VT board for Honeywell Enraf 990 SmartRadar FlexLine This instruction manual describes the commissioning settings in conjunction with the Honeywell Enraf 854 servo level gauges, the 877 Field Display & Interface and the 97x SmartRadar level gauges. The commissioning of the different type of probes is divided over the following chapters: • Average temperature with VITO (combi) probes: chapter 2 • Average temperature with MRT: chapter 3 • Average temperature with MPT or 2 – 3 spots: chapter 4 • Water bottom measurement: chapter 5 Refer to the Commissioning manual SmartRadar FlexLine for the average temperature commissioning and water bottom settings with the 990 SmartRadar FlexLine. Instruction manual VITO Page 7
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118_4416655_Rev06

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