7
GENERAL
General danger to life or limb
Specific danger to life or limb
You MUST do this
Related to ATEX/Intrinsic Safety requirements
The safety instructions are provided again in the individual chapters of the manual.
1.41.4
1.41.4
1.4
AA
AA
A
BBREVIABBREVIA
BBREVIABBREVIA
BBREVIA
TIONSTIONS
TIONSTIONS
TIONS
The following abbreviations are used:
OM Operating Manual
SPX Smart Pressure Transmitter
f.s. of full scale
PT Pressure Transmitter
HART Highway Addressable Remote Transducer
PV Primary Variable (Pressure)
SV Secondary Variable (Electronics Temperature)
URV Upper Range Value
LRV Lower Range Value
E
2
PROM Electrically Erasable Programmable Read Only Memory
Watchdog An internal monitor for the electronics
BFSL Best Fit Straight Line
1.1.
1.1.
1.
55
55
5
TT
TT
T
RANSRANS
RANSRANS
RANS
MITMIT
MITMIT
MIT
TERTER
TERTER
TER
P P
P P
P
RINCIPLERINCIPLE
RINCIPLERINCIPLE
RINCIPLE
OFOF
OFOF
OF
O O
O O
O
PERAPERA
PERAPERA
PERA
TIONTION
TIONTION
TION
The mechanical system (filled assembly) consists of a lower diaphragm, a filled capillary tube, and an
upper diaphragm with a strain gage. The filled assembly transmits pressure from the process to the strain
gage diaphragm where it is converted to an electrical signal. The filled assembly isolates the electronics
from the high process temperatures.
The lower diaphragm is the surface in contact with the media being measured. This diaphragm can be
made from a choice of materials. The standard material is heat-treated 15-5 stainless steel with Dymax
TM
coating. This has average corrosion and abrasion resistance and is similar to 17-4 stainless steel. Other
materials are also available including Hastelloy C-276 which has excellent corrosion resistant properties
(but is not good for abrasion). For other materials please consult the factory.
Behind the lower diaphragm is a capillary tube filled to the upper diaphragm. As the process pressure
deflects the lower diaphragm, the fill is displaced through the capillary tube to deflect the upper
diaphragm.
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