KROHNE VFM 1091, Installation And Operating Instructions Manual

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6. m function
6.1 Numerical order description
This section describes all the functions which can be programmed locally.
Some of the parameters of the device can be programmed using the
HART
®
based communicator (For example HHC 275). These are given
with their corresponding Generic Online Menu (GOM) steps for HHC275.
For more details of GOM refer to 6.2.12 and 6.2.14. Program functions are
given in numeric
order as follows:
·
Function number & title
·
Description of the function
Limits – Applicable limits for numerical input
Fct. 1.0 OPERATION
This is the first main menu level. Submenus and their functions grouped
under (1.x.x functions) control the operation of the instrument in the
following areas:
- flow range to measure.
- display settings of measured values, units, errors etc.
- pulse output programming.
Fct. 1.1.0 BASIC.PARAM
This submenu groups functions that:
- Set basic flow measurement type ( volumetric / normalized-volumetric /
mass flow measurement)
- Flow range (minimum & maximum flow) to measure time constant for
flow rate.
Fct. 1.1.1 MEAS.INST. measuring instrument type
Set instrument to measure volumetric or normalized volumetric or mass
flow rate as per the options –
• VOLUME • NORM. VOLUME • MASS
Usually, this function is initially used only once. If you need to change the
basic measurement type later-on, you should check/reprogram all flow rate
and totalizer related functions such as -
MAX FLOW, MIN. FLOW,
FLOW UNITS, TOTAL. UNITS, RANGE P, TOTAL. VALUE
HART: GOM 1,3,2
Fct. 1.1.2 MAX. FLOW
maximum flow rate
Enter the maximum flow rate desired. Max. flow should be within the
measuring range for the given primary data (3.l.x functions) and
application data (3.3.x functions).
After setting the Qmax value, set range P value Fct. 1.3.2 to ensure that the
Pulse output function works normally. The current output range (4-20mA)
corresponds to 0% flow (Q
0%
) and 100% flow (Q
100%
) respectively. The
value of Q
100%
is entered at the MAX. FLOW Function.
If the flowrate exceeds the
MAX FLOW an error condition (HIGH FLOW)
is generated
Description of progra
.
The following units are available to choose from depending on
programming of. Fct. 1.1.1 MEAS. INST.
for volumetric flow –
•
m3/hr
•
m3/min
•
UK Gal/Sec
•
Litre/hr
•
Litre/min
•
Litre/Sec
• ft3/hr •
ft
3
/min
•
ft
3
/Sec
•
cft/hr
•
cft/min
•
cft/Sec
•
cuft/hr
•
cuft/min
•
cuft/Sec
•
US Gal/hr
•
US Gal/min
•
US Gal/Sec
•
UK Gal/hr
•
UK Gal/min
•
UK Gal/Sec
for normalized volumetric flow –
• Norm.m3/hr • Norm.m3/min • Norm.m3/Sec
• Norm.L/hr • Norm.L/min • Norm.L/Sec
• Sft3/hr • Sft3/min • Sft3/Sec
• Scft/hr • Scft/min • Scft/Sec
for mass flow -
• kg/hr • kg/min • kg/Sec
• T/hr • T/min • T/Sec
• Lb/hr • Lb/min • Lb/Sec
LIMITS
1 to 1 x 10
HART : GOM 1,3,3
Fct. 1.1.3 MIN. FLOW minimum flow rate.
Enter the minimum flow rate in the same units as for max. flow above.
Min. flow should be within the measuring range for the given primary
data (3.1.X functions) and application data (3.3.X functions). If flow is
below min.flow then an error condition (LOW FLOW) will be
generated. Note that this value should not be zero for vortex
flowmeters. This value is normally set to the minimum flowrate
(determined from sizing) for the size of primary used.
LIMITS –Greater than zero to (0.5*max flow.) Higher limit is 50%
of the value entered
Fct. 2.1.2 MAX FLOW,
HART: GOM 1,3,3
Fct. 1.1.4 TIMECONST.
time constant for flow rate
Enter a low-pass filter time constant in seconds to be applied to flow
rate. A value of zero indicates that low-pass filter is not be applied.
With this function it is possible to compromise between a steady
indication (on display/current output) and response time (to flow
changes)
LIMITS – 0 TO 20 SECONDS
HART : GOM 1,3,6
Fct. 1.2.0 DISPLAY
This submenu group the display function which
- Allow selection of units for all measured parameters
- Select what parameters to include in display cycle
- Select display mode (cyclic/non-cyclic) and error messages to/not to
appear in display cycle