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17 TN5FCXA2VG-E
Isolating valve
Process pipe
Pressure tap
Impulse pipe
Manifold
Atmospheric
air inlet
4- Pressure measurement for liquid
The transmitter must be below the process pipe.
(1) During valves and manifold installation, please make sur that no dust
enter through the atmospheric air inlet.
(2) If pressure measurement is low (below 10kPa (1000mmH
2
O), the fol-
lowing should be considered.
• Pressure variation due to wind around atmospheric air inlet
• Temperature variation near process connection
• Difference in atmospheric pressure between process connection and
transmitter location.
To overcome this, provide atmospheric pressure-side pipe with a proper
orifice and consider accommodating the transmitter and atmospheric
air inlet in a box.
5- Pressure measurement for gas
Place the transmitter above the process pipes to pre-
venting condensation in the impulse pipe and in the
measuring
6- Level measurement
(1) Reference column filled
For measurement, connect the highest liquid level of tank with the low pressure side of
transmitter, and the lowest liquid level of tank with the high pressure side of transmitter.
The reference column (connected to the high-
est level of tank) must be filled of fluid.
Level calculation formula
LRV :
ρH
2
– ρ
0
H
1
URV : ρH
2
+ ρ
1
h – ρ
0
H
1
LRV : Low limit of measurement (0% point)
URV : High limit of measurement (100% point)
ρ
0
,ρ,ρ
1
: Density
H
1
, H
2
: Liquid level,
h:
Liquid level change
H
1
H
2
ρ
0
ρ
h
ρ
1
Max. liquid level
Min. liquid level
Condensate chamber
High
pressure
side
Manifold
Low
pressure
side
Isolating valve
Process pipe
Impulse pipe
Manifold
Pressure tap
Atmospheric
air inlet
ATTENTION