![background image](http://html1.mh-extra.com/html/intra-automation/digiflow-515/digiflow-515_installation-and-operating-manual_2081780004.webp)
Gas- and Steam Flowcomputer
DigiFlow 515
Operating Manual
4
Note.
The information in this document can be changed without previous announcement.
These instructions do not claim to cover all details or variations in equipment, nor to provide for every possible contin-
gency that may arise during installation, operation or maintenance.
Should further information be desired or should particular problems arise that are not covered sufficiently for the Pur-
chaser’s purposes, the matter should be referred to the local INTRA Sales Office.
The contents of this instructions manual shall not become become part of or modify any prior or existing agreement,
commitment or relationship. The Sales Contract contains the entire obligations of INTRA. The warranty contained in the
contract between the parties is the sole warranty of INTRA. Any statements contained herein do not create new warran-
ties or modify the existing warranty.
Directory of the symbols used in this handbook
Symbol
Description
SI unit
US-unit
A
Normalized Signal between 0 and 1 (0
≡
4 mA and 1
≡
20 mA
– –
d
specific Gravity. Ratio of the density of a gas to the density of air
–
–
f Frequency
Hz
Hz
h
v
, h
r
specific Enthalpy at Flow Conditions
kJ/kg
kJ/kg
h
0
specific Enthalpy at Reference Conditions
kJ/kg
k
F
k-factor (pulses/unit) for a frequency flowmeter.
n/m
3
n/m
3
No Timebase Constant with which the flowrate is displayed:
1 for units/s,
60 for units/min.,
3600 for units/h,
86,400 for units/d.
– –
p
Pressure at Flow Conditions.
kPa
abs
psi
a
p
b
Pressure at Reference Conditions.
kPa
abs
psi
a
p
krit
Critical Pressure of Gas.
kPa
abs
psi
a
Q
E
Energy Value of Steam.
MJ/TU
BTU/TU
Q
M
Mass
Flowrate.
kg/TU lbs/TU
Q
Vb
Corrected Volume Flowrate.
m
3
/TU ft
3
/TU
S
M
Span of Mass
kg/TU
lbs/TU
S
V
Span of Volume.
m
3
/TU ft
3
/TU
S
Vb
Span of Volume at Reference Conditions.
m
3
/TU ft
3
/TU
T
Temperature at Flow Conditions.
K
K
T
b
Temperature at Reference Conditions.
K
K
T
krit
Critical Temperature of Gas.
K
K
z
f
Compressibility at Flow Conditions
–
–
z
b
Compressibility at Reference Conditions
–
–
ρ
Density at Flow Conditions.
kg/m
3
kg/m
3
ρ
b
Density at Reference Conditions.
kg/m
3
kg/m
3
υ
Specific Weight of Steam at Flow Conditions.
dm
3
/kg dm
3
/kg
υ
b
Specific Weight of Steam at Reference Conditions.
dm
3
/kg dm
3
/kg
* TU = Time Unit (d, h, min, s)
Remark:
Are a temperature of 0°C and a pressure of 101,325 kPa
abs
as normalized conditions programmed, the vol-
ume unit will so be added with the prefix „N“ in the display, to point to this „NORM“-state. If a temperature of
15°C and a pressure of 101,325kPa
abs
are defined as normalized conditions, then the volume unit will be
prefixed by an „s“, to point to this „standard-conditions, which are often used at US-Units.
Summary of Contents for digiflow 515
Page 2: ......
Page 43: ...Gas and Steam Flowcomputer DigiFlow 515 Operating Manual 43...
Page 44: ...Gas and Steam Flowcomputer DigiFlow 515 Operating Manual 44...
Page 45: ...Gas and Steam Flowcomputer DigiFlow 515 Operating Manual 45...
Page 46: ...Gas and Steam Flowcomputer DigiFlow 515 Operating Manual 46...
Page 47: ...Gas and Steam Flowcomputer DigiFlow 515 Operating Manual 47...