Model 2000 Flow Computer Instruction Manual
2.0 GENERAL DESCRIPTION
Model 2000 issue 21 Page No
36
The actual gas data values to be used in all calculations etc. will be displayed under the Used menu item and these data
values will also be accompanied by an origin status as listed below:-
OK
Used value received and it is valid.
ISO 6976
Used value is calculated from ISO 6976 Standard..
Keypad
Used value is the keypad entered value
LGV
Last Good Value. Used value is the last serially received value before a problem.
2.4.7.1. NORMAL OPERATION
For normal operation the source of the gas values to be used can be selected from the pull down menu list Gas Values
(Normal) as follows:-
Use Chromat
Use Modbus
Use Analogue
Use Hourly Average
Use Daily Average
• Pre-Set Gas Data
To operate the Model 2000 in preset gas data mode, it is only required to set a keypad value for all gas data items, it is
not necessary to enter any Max, Min, Hi or Lo values. Under the Used menu option the Model 2000 will display the gas
data values currently being used and the origin status of those values, in this case as the Model 2000 has no other
values it will use the keypad values and display the source for each item as Keypad.
• Gas Data from a Chromatograph
For the gas component values be received directly from a gas chromatograph a communication port must be configured
and assigned for that function. As determined by the gas chromatograph configuration set-up the Model 2000 will then
periodically interrogate the gas chromatograph for values. These values will be checked as previously described and if
they are valid and in range, they will become the gas used values.
• Gas Data from a Modbus Serial Port
If the Model 2000 is to operate using serially written gas data from a configured Modbus serial communication port, then
values must be written into the received gas value locations. These values will be checked as previously described and
if they are valid and in range, they will become the gas used values.
• Gas Data from an Analoge Input
If the Model 2000 is to operate using gas data from a configured Analogue input, then values will be measured from the
appropriate analogue inputs. These values will be checked as previously described and if they are valid and in range,
they will become the gas used values.
• Hourly or Daily Average
It is also possible to select the unit to use either the current Hourly average Values or current Daily average values in
Normal operation by selecting either the Use Hourly Average or Use Daily Average menu item when setting the unit up.
The source of the average values will be determined by the Gas Average selection menu.
Use Chromat
Use Modbus
Use Analogue
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