6.2.2 Numerical format
•
Display of numerical values
Real (i.e. fractional) values are displayed in the first line of the display consisting of 8 digits. Number is displayed in floating point format as far
as possible, otherwise an exponent notation is used. See examples below.
Floating format: 1234. 56.
Exponent format: 1.234E-10
In most practical applications, it is very rare that parameters need be displayed in exponent format.
The number of significant figures displayed is 6.
•
Input of numerical values
Entry of numerical values is in the following format n.nnnnEn
Examp les: 1.2345 E + 3
Programming: refer to section 5.4
6.2.3 Display
Organization -
display consists of the following 3 fields.
Field 1:
Numeric (8 digit, 7 segment) used primarily for showing numeric values.
Field 2:
Alphanumeric (10 characters, 14 segments) used for showing units, messages etc.
Field 3:
Consists of [a] 6 markers at the bottom of display which are used to identify the parameter being
and [b] key-field at the top left of the display which is used to acknowledge the keys.
Programming –
Measurement mode setting are as follows.
Ø
To allow selection of units for all measured parameters.
Refer to Sect. 6.1
Fct. 1.2.1 to 1.2.4
Ø
Select what parameters to include in display cycle.
Refer to Sect. 6.1
Fct. 1.2.2 to 1.2.5
Ø
Select display mode (cyclic / non-cyclic) and error messages to / not to appear in display cycle.
Refer to Sect. 6.1
Fct. 1.2.5 to1.2.6
Measurement mode -
Display shows measured parameter(s) in its selected unit. The marker identifies the parameter being displayed.
Parameter is displayed continuously in non-cyclic mode. [refer sect. 6.1
Fct. 1.2.6
]. To select other parameter(s) of the display cycle, if any,
use key. In cyclic mode, all the parameters selected in the display cycle are displayed in sequence one after another every 6 seconds.
Programming mode-
Numeric line indicates menu/function level such as
Fct.1.0
[current menu level digit "1" blinks] and alphanumeric line
indicates menu/function title such as
OPERATION.
Error indications -
Blinking display in measurement mode indicates that error(s) are present. Error messages are displayed interleaved between
changing from one display parameter to other, if
Fct. 1.2.5 ERROR.MSG
is
YES.
For description of error message refer Sect. 5.5.
Testing of display –
Use
Fct. 2.1 TEST DISP
for display test. All segments of the display are flashed. You can press key at any time to
terminate display test.
6.2.4 Flow range and meter
Flow rate (min. flow to max. flow) which the flowmeter will be able to measure depends on the primary data (3.1.x functions) and application
data (3.3.x functions). Thus, the flow range specified under the
Fct. 1.1.2 MAX FLOW
and
Fct. 1.1.3 MIN. FLOW
must be within the measuring
range. Flow range for any given application is determined by sizing the meter for that application. If flow rate exceeds max. flow an error
condition
(HIGH FLOW)
is generated. When the flow rate falls below the min. flow an error condition is generated. Vortex sensor signal l is
weak at this condition
LOW FLOW
and if flow rate reduces further, vortex signal related errors such as
NO SIGNAL, LOW FREQ.
will occur.
21
Summary of Contents for VFM 1091
Page 1: ...4 2001 Vortex flowmeter Installation and Operating Instructions VFM 1091 I...
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Page 30: ...Certificate number of VFM 1091 I Ex FM CSA PTB approvals are pending 30...
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