AFRISO RF EX Serie Betriebsanleitung Seite 62

The shift of the initial value
ρ ρ
( M - L) = Difference in density
ρ
M = Density of the medium [kg/m³]
ρ
L = Density of air (1.205 at +20 °C) [kg/m³]
g = Gravitational acceleration (mean value 9.81) [m/s²]
Δ
h = Height difference [m]
The displayed value is reduced by
the pressure tap piece, it is increased by
1. If a static liquid column acts on the product, adjust the product and ensure
that the adjustment is shown on the dial.
2. If the product is at a lower level than the pressure tap piece, flush the
measuring line prior to commissioning in order to remove external matter.
It is advisable to install a shut-off unit to facilitate dismounting of the product
for maintenance purposes.
Bourdon tube pressure gauges with measuring ranges of ≤ 25 bar have a
blow-out at the top of the housing. These products are fitted with appropriate
labels. For liquid filled products with lateral connection, special housings are
used and the blow-out is located at the top of the housing with the product in
its installed position.
3. Vent the product by cutting off the nipple at the blow-out.
- The internal pressure compensation contributes to accurate indication.
Mounting
Δ ρ
p = 10 - 5 ( M -
Δ
p if the product is at a higher level than
Δ
ρ • • Δ
L) g h [bar]
p if the product is at a lower level.
RF ... EX / KP ... EX
EN
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