Calculate
Number of Points is the number of flow reference points. Each point is
one reference flow rate (determined by traverse testing or other) and
the associated Vari-Green system flow rate. The traverse testing flow
rate for these reference points is performed before entering this screen
and is written down with the associated Vari-Green point (flow rate). For
most applications, a minimum of two points (low and high flow rates) are
recommended for an accurate Field Characterization. Three points may
be required.
Electra Point refers to the flow rate measured by the transmitter, and
Reference Point refers to the flow rate measured externally. Electra Point
1 and Reference Point 1 will be the flow rates for the first test, Points
2 for the second test and Points 3 for the third test. Best practice will
be to go from the lowest to highest flow rates when inputting this data.
Once all data has been entered and the
ENT
button is pushed for the
final Reference Point, the Calculator will display the calculated gain and
exponent values.
NOTE: Whenever a system is being retested in order to determine
a new Field Characterization (K-factor), the existing Field
Characterization should be turned off prior to testing.
Manual
Selecting Manual will allow inputting of externally determined Gain (K)
and Exponent (E) values, where:
Flow (corrected) = K x Flow (uncorrected) ^ E
Note: A Gain (K) only Field Characterization (K-factor) can be
achieved with an exponent (E) value = 1.0.
SERVICE MENU
Total System Scan
Displays the current status of all of the system sensors, thus allowing
the user to quickly verify all is operating properly. Expected (white)
and Enabled (green) sensor values should be the same unless sensors
have been intentionally Disabled (red). See below for sensor control.
If Missing (yellow) is at a value other than zero, the transmitter is not
communicating with the associated node.
Sensor Control
An enabled sensor will report measurement data to the Vari-Green
transmitter. This is the default condition after initially powering the
system. A disabled sensor will not report measurement data to the
Vari-Green transmitter. Disabled sensors may have a malfunction that
causes this condition. It may also be desirable to intentionally disable a
sensor for troubleshooting purposes. A known bad or suspect sensor
can be disabled to remove it from the flow and temperature averages
until it can be evaluated and/or repaired if necessary.
Sensor Data Scan
Displays sensor number (Sen), power input to sensors (PWM),
temperature difference between flow and temperature sensors (DELTAt),
velocity (FPM), flow temperature sensor (FLOWt) and the reference
temperature sensor (REFt).
This data display screen can be used to further evaluate and
troubleshoot the system performance and the application
characteristics; e.g., the individual sensor velocities and temperatures
will provide comprehensive data regarding the flow profile measured.
Characterization Calculator
ENT - Accept ESC - Leave UP/DN - Change
Number of Points:
1
300.0
400.0
Electra Point 1:
Electra Point 2:
Electra Point 3:
Reference Point 1:
Reference Point 2:
Reference Point 3:
Total System Scan
ESC - Leave
Expected
Missing
Enabled
Disabled
0
0
2
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
32
31
32
Sensor Control
ENT - Toggle ESC - Leave UP/DN - Select
Sensor 2: Enabled
Sensor 1: Disabled
Sensor Data Scan
ESC - Leave UP/DN - Page Scroll
Sen
PWM
DELTAt
FPM
FLOWt
REFt
1
8980
31.3
885.0
104.9
73.6
2
6813
35.0
382.0
108.2
73.2
3
0
0.0
0.0
0.0
0.0
4
0
0.0
0.0
0.0
0.0
5
0
0.0
0.0
0.0
0.0
6
0
0.0
0.0
0.0
0.0
7
0
0.0
0.0
0.0
0.0
8
0
0.0
0.0
0.0
0.0
9
0
0.0
0.0
0.0
0.0
10
0
0.0
0.0
0.0
0.0
Vari-Green® Transmitter
8
®
