Chapter 1. Programming Site Data
16
DigitalFlow™ GF868 Programming Manual (2-Channel)
1.6.5 Entering Setup Data
The signal limits and response times for the Model GF868 are specified via the
SETUP
submenu. It includes three
submenus:
•
SIGNL
- set the parameters related to the transducer signal
•
AVRG
- specify the response of the meter to step changes
•
INIT
- initialize all parameters to default values.
•
ADVAN -
set up mass flow and enter a table of K factors
To enter the
SETUP
submenu, press [
and
[F1]
at the
Channel PROGRAM
prompt, and refer to Figure 12 on page 88.
Remember to record all programmed data in Appendix B,
Data Records
.
1.6.5a Setting Signal Limits
Use this option to set the limits for the incoming signal and other parameters affecting the transducer signal. For
example, the programmed signal strength low limit may be used to determine the trigger point for an alarm. Table 5 on
page 19 summarizes the default values and limits for parameters in this menu.
Only after consultation with the factory, complete the following steps to enter the signal parameters:
1.
Press [
and
[F1] = SIGNL
to enter the
SIGNAL
submenu.
2.
Press
[ENT]
to accept the current
Signal Low Limit
value or enter a new value and press
[ENT]
. (The meter will only
accept values from –20 to 100. )
The default value for this parameter is 20. The
E1: LOW SIGNAL
error message appears when the signal strength falls
below the programmed
SIGNAL LOW LIMIT
value.
Note:
See the Service Manual for a discussion of error codes.
3.
Press
[ENT]
to accept the current
Cor. (Correlation) Peak Limit
value or enter a new value and press
[ENT]
.
The default value for this parameter is 100 and values from 0 to 500 are acceptable. The
E4: SIGNAL QUALITY
error
message appears when the signal quality falls below the programmed
COR. PEAK LIMIT
value.
4.
Press
[ENT]
to accept the current
Velocity Low Limit
value or enter a new value and press
[ENT]
.
The default value for this parameter is –300.0 ft/sec (–85 m/sec) and values from –500 to 500 ft/sec (–150 to 150
m/sec) are acceptable. The
E3: VELOCITY RANGE
error message appears when the calculated fluid velocity is less than the
programmed
VELOCITY LOW LIMIT
value.
CAUTION!
The SIGNL default settings are suitable for most applications. Before changing
any of these parameters, consult the factory.
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