Open Tank Level Measurement; Liquid Flow - ABB Platinum standard Series Product Instruction

N OT E S :
1 . M O U N T T R A N S M IT TE R B E S ID E O R B E L OW P R IM A RY E L E M E N T
C O N N E C T IO N S .
2 . A LL H O R IZ O N TA L L IN E S S H O U LD S L O P E AT L E A S T 8 3 M M /M (1 IN ./F T )
D O W N W A R D TO TR A N S M IT T E R .
3 . T R A N S M ITT E R M U S T B E T H O R O U G H LY V EN TE D TO AVO ID E R R O R S IN
M E A S U R E M E N T.
4 . A LL VA LV E S AT PR ES S U R E C O N N E C T IO N S S H O U L D B E IN N E AR LY
V E RT IC A L P O S IT IO N .
5 . M A K E P R E S SU R E C O N N EC T IO N TO S ID E O F F LA N G E IN H O R IZ O N TA L
F LO W.
F O R LIQ U ID S U P TO 1 2 1°C (2 50 °F )
A
1 /2 -IN .
T U B IN G
B LO W -D OW N
VA LV E S
WBPEEUI110504A0
F O R LIQ U ID S AT O R A B OV E 1 21 °C (2 50 °F )
B OT H N IP PL E S S H O U LD B E LA G G E D U P TO
1 /2 -IN . VA LV E S .
F LO W
B E N T N IP P L E R E Q U IR E D
H I TO B R IN G U P P ER
E
C O N N E C T IO N D O W N TO
S A M E E LE VAT IO N A S
L OW E R C O N N E C T IO N .
L O
–
+
C
B
V ER TIC A L P IP E
Figure 3-2. LIquid Flow

OPEN TANK LEVEL MEASUREMENT

In an open vessel, level can be measured by making a pressure
measurement (P) at the bottom of the vessel (Figs.
3-6). The pressure at the transmitter + (high pressure) connec-
tion is equal to the product of the height (h
gravity (SG) of the liquid. Since SG is known, and P is the mea-
sured pressure, then:
P
h
= -------- -
2
SG
1. Refer to Figure
open tank level measurements.
2. Make the pressure connection to the + (high pressure) side
of the transmitter.
3. Leave the - (low pressure) side of the transmitter open to
the atmosphere.
NOTE: It is not unheard of for bees, wasps, spiders, and other
unwanted insects to make a home of the open low pressure process
connection. To prevent this, cover this connection with a fine screen
or cheese cloth.
A 1 /2 -IN . VA LV E S - S TE M S U P O R AT S LIG H T A N G L E . S TAG G E R FO R C L E A R A N C E .
A D D IT IO N AL S E T O F VA LV E S R E Q U IR E D F O R L O N G C O N N E C T IN G LIN E S O R
B
W H E N D ES IR A B L E TO M O U N T U N IT AT FL O O R L E V EL TO P ER M IT S E RV IC IN G .
E Q UA L IZ IN G VA LV E .
C
2 -IN . S U P PO RT IN G P IP E (C U S TO M E R S U P P LIE D ).
D
E 1 /2 -IN . N IP P LE S TO S ID E O F F LA N G E (L AG G IN G A S A P PL IC A B LE ).
F P LU G G E D TE E S F O R S EA L IN G F LU ID.
F LO W
L O
A
F
B
D
B LO W -D OW N
VA LV E S
H O R IZO N TAL P IPE
3-6 for a typical piping arrangement for
SETUP AND PHYSICAL INSTALLATION
INSTALLATION
H I
1 /2 -IN . T U B IN G
–
+
C
D
T 02 21 6 A
3-5 and
) and the specific
2
3 - 7