Introduction
P
age 8
1.1.3 Relative density
To measure the relative density, the displacer is positioned at specific heights and the apparent weight of the
displacer at each height is measured. Knowing the volume of the displacer, its weight in air, and the measured
apparent weight, the relative density of the product at each position of the displacer can be calculated. The
software for the density measurement is available as an option.
1.2 Optional functions
Optional functions as temperature measurement, pressure measurement, water bottom measurement, HIMS
density measurement and analog level output requires the optional HCU board to be installed.
Alarm relays are optionally available on the SPU II board. Density measurement is an optional module of the
SPU software.
The table below gives an overview of all options and related manuals.
Option Board Refer to
Level alarm output relays
(or digital outputs)
SPU II Instruction manual SPU II Hard alarm output contacts
Density measurement SPU II Instruction manual 854 density option
Analog level output (4-20 mA) HCU Instruction manual Spot temperature and Analog
output options
Spot temperature measurement HCU Instruction manual Spot temperature and Analog
output options
Average temperature measurement
via VITO temperature probe or MRT
HCU Instruction manual VITO
Pressure measurement for mass,
density and/or vapour pressure
measurement
HCU Instruction manual HIMS
Water bottom measurement HCU Instruction manual Temperature, Water bottom and
Analog output options
Connection for 977 TSI
XPU-2 Instruction manual 977 TSI Tank Side Indicator
RS-232C / RS-485 communication XPU-2 Instruction manual XPU-2 option
RS-232C / RS-485
Foundation Field Bus GFC Instruction manual Foundation
Fieldbus interface
1.3 Remote monitoring
Central monitoring of the 854 ATG is possible via tank inventory systems such as Entis Pro and Entis XS.
Remote display can be achieved by using the 877 FDI field indicator, the 977 TSI tank side indicator or the 878
CPI panel indicator.
1.4 Approvals (ATEX / IECEx, FM)
The Honeywell Enraf 854 Advanced Technology Gauges are certified by official testing institutes as KEMA
(ATEX) and Factory Mutual to be explosion proof (suitable for zone 0). The gauges are also approved and
certified by Weights and Measures (W&M) or Custom and Excise authorities for legal use and custody transfer.
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