Model 2000 Flow Computer Instruction Manual
2.0
GENERAL
DESCRIPTION
Model 2000 issue 21
Page No
38
2.4.7.6.
AVERAGE GAS DATA
The Model 2000 calculates and makes available hourly and daily averages for the gas component values The source of the
average values will be determined by the Gas Average selection menu.
Use Chromat
Use Modbus
Use Analogue
Daily Average is calculated from Contract time to Contract time.
In each case the available average is for the last complete time period either hour or day. These values are available to be
displayed, printed etc. no set up is required they are calculated automatically.
2.4.8.
DENSITY TRANSDUCER INPUTS
The density meter input to the Model 2000 is for a high frequency periodic type meter. It uses the same type of input as
would be configured for a turbine pulse inputs and this is of the form of one periodic input signal with the following
parameters.
Current input:
10mA.
Frequency range:
Up to 5kHz.
Two basic types of Transducer are supported the Solartron and the Sarasota, these use different calculation methods as
defined in paragraphs 2.5.7.3 and 2.5.7.4.
2.4.8.1.
MULTIPLE DENSITY TRANSDUCER INPUTS
The Model 2000 can be configured to use multiple transducer inputs for density measurement. It can be configured to use
one or two transducer inputs either from the same type of transducer or from different transducer types. Each transmitter
input is individually checked for correct in range operation (within Max. and Min. limits). All available inputs are then checked
for deviation against a pre-set limit. All values that pass all of the above checks are then passed for use to a selection list.
The selection list serves to select the parameter value to be used in all further Model 2000 calculations, it is a list of all
possible items that could be selected and the order in which they would be selected for use if available:-
Density Sensor 1
Density Sensor 2
Calculated from AGA 8
Keypad Value
None
All available sensor values, the calculated value from AGA 8 and the Keypad entered value will be displayed together with
the status of that value, possible status indications are :-
ON OK
Transmitter is ON and Value can be used
OFF
Transmitter is selected OFF
ALM
Transmitter or Value is in Alarm
DEV
Value is outside deviation limit
N/A
Value is not available
The Model 2000 will continuously check all of the above and display the currently used parameter together with its source.
The currently used parameter is compared against the High and Low alarm settings if they are available and a non
accountable alarm raised if appropriate.
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