Elster Instromet 2000, Инструкция по эксплуатации

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Model 2000 Flow Computer Instruction Manual
2.0 GENERAL DESCRIPTION
Model 2000 issue 21 Page No
17
2.2.23. MAIN MENU FUNCTION Calibration
This menu item when selected will allow access to the Input parameters that will require calibration via the Keyboard and
Display of the Model 2000. When this menu item is selected the user will be prompted to enter a four digit numeric
password, to gain access to the calibration pages. It is possible to set-up a maximum of three different passwords and each
of these passwords can be set to allow access or not to the calibration pages, these passwords are the same as used in the
EDIT mode. In its factory default condition the three available passwords are 1111, 2222 and 3333. Once the password has
been entered and accepted a calibration sub menu will appear as follows:-
Outputs Selects calibration of any Analogue output.
Analogue Selects calibration of any Analogue input.
Hart Selects calibration of any Hart Loop input.
Exit Returns operation to the Main Menu.
Each Analogue input calibration page relates to a single input parameter and will show the item being calibrated and its
circuit board position, a High and Low calibration point and the current value for that input.
The display cursor can be moved between the High and Low Calibration values using the [
↑
] (for up) and [
↓
] (for down)
cursor keys and selecting by pressing the enter or return key. The new value is then entered using the numeric key pad and
finally pressing the enter or return key to confirm. At this stage in the calibration session the High and Low calibration point
number changes have been recorded but are not being used by the Model 2000. The input parameter should now be
physically altered until it corresponds to the High or Low calibration point and the display cursor set to point at which ever
(High or Low) calibration point is being entered. The SET function key should be operated to set the physical input variable to
the High or Low calibration point. The procedure can then be repeated for the other calibration point and can also be
repeated as many times as required. It is recommended that the High and Low calibration points are as far apart in the span
of the input as is practical and that should at least be at the extremes of the intended operating area. At any time in the
calibration session the operator can revert back to either the DEFAULT or PREVIOUS calibration by operating the
RESTORE function key and selecting the appropriate item.
Each Hart input calibration page relates to a specific Hart Loop the position of the loop will be shown on the top left hand
corner of the calibration page and will refer to SLOT 1 to 5 defining the User board positions (See figure 2 for positions) and
Loop 1 or 2 (See appendix 3 for connections). The Hart Calibration page will show all transmitters (up to 3) currently
configured for that loop and the process variables and units being read from them. The Calibration page will allow the
communication to the Hart transmitters to be switched ON (Normal condition) or to be switched OFF (Calibrate condition) So
that a Hart loop calibrator can be connected to the system and each of the connected transmitters calibrated or checked.
NOTE it is not possible to individually turn off the transmitters on one loop , all must be either ON or OFF.
All Analogue outputs can be calibrated on the Output calibration page. The operator is prompted to:
Select the level of the analogue
outputs
The F1 key will then select the Minimum range value either 0mA or 4mA, the value will depend upon the actual setting of the
output board.
The F2 key will then select the Maximum range value either 20mA or 24mA, the value will depend upon the actual setting of
the output board.
NOTE All Analogue Outputs in the M2000 will be set to either the Min or Max values at the same time when the unit is
operated in this mode.
The user can go on to calibrate as many Hart or Analogue input parameters or Analogue Output stages as are required.
Once all the changes are complete the user can Exit the EDIT section by selecting the function key EXIT. Selecting the EXIT
function will prompt with a EXIT menu as follows:-
Exit & Save Exit the calibration mode, save the changes to memory and use the new values.
Exit & No Save Exit the calibration mode, do not action any of the changes made.
Undo Do not exit calibration mode and undo all previous changes in this session.
Any HART loop left in the OFF state when exiting the Calibrate mode will automatically be switched ON when the unit is
returned to the running condition.
All Analogue Outputs will be set to the normal operating function after leaving the Calibrate mode.