Accessories
Electronic Display Unit
Programming the Unit (Set-up)
The Unit can be programmed via
- the Control Buttons
- a connected PC
Programming via the Control Buttons
Programming of the Unit is carried out from the Set-up-Menu. The Set-up-Menu is activated by pressing the ENTER and SELECT Buttons at the same time (for about 0.5 seconds).
Warning: By activating the Set-up-Menu, all measurement values will be reset to zero, as a new initialisation follows.
Activation of the Set-up-Mode will be indicated in the Display as shown below, to differentiate it from the operational mode:
>>>>Setup<<<< |
Each time the ENTER Button is pressed in the Set-up-Mode, the individual Menu Points will be successively called up. The SELECT Button has a selection function and pressing the SELECT Button will then select the desired setting. Following this, pressing the ENTER Button will save the selected Setting and move to the next Menu Point.
If no input is made in the Set-up-Mode within a time frame of 20 seconds, the program leaves the Set-up-Mode, having saved all instructions given up to that time (Exception: Application of a maximum Volume value for the Analog-Output, Point 6.1/14).
After the last Menu Point, the Set-up-Menu will be closed through a new initialisation, which will save the given data.
Order of the Menu Points:
1. Language
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2. Contrast
The Contrast is programmable in a Scale range of 0 to 7. 0 is the smallest and 7 the greatest contrast. The contrast is increased by one scale value with each press of the SELECT Button | ||||||||||||
3. Gas Meter Type
Each press of the SELECT Button calls up the next Gas Meter type in increasing order of Meter size (in the order of the Gas Meter types in Tables 1 and 2 in Point 4.4). After the last Gas Meter (BG100), the first (TG01) will appear again. | ||||||||||||
4. Sensor Type
Sensor type 3.X stands for all sensors of version V3 | ||||||||||||
5. Slit disk
Selection of Gas Meter’s slit disk: | ||||||||||||
6. Standard-/Individual-Parameter
- "Parameter Stand.": Activation of the pre-programmed standard values for the Gas Meter type. | ||||||||||||
7. Alarm Function "maximum flow rate"
An Alarm Maximum Flow Rate value in [ltr/h] can be programmed within the measurement range of the Gas Meter, such that overshooting this value will cause a built-in Beeper to give an alarm. In order for this to happen however, the Beeper must be activated through the Menu Point "Beeper". Exceeding the flow rate produces a repeating sequence of notes in the form of "short-pause-long" ("beep - pause - beeeeeep"). | ||||||||||||
8. Alarm Function "minimum flow rate"
An Alarm Minimum Flow Rate value in [ltr/h] can be programmed within the measurement range of the Gas Meter, such that undershooting this value will cause a built-in Beeper to give an alarm. In order for this to happen however, the Beeper must be activated through the Menu Point “Beeper”. Being under this flow rate value produces a repeating sequence of notes in the form of "long -pause" ("beeeeeep - pause"). | ||||||||||||
9. Beeper
The Beeper must be activated or deactivated depending on whether a signal is required to indicate that programmed maximum and minimum flow rates have been exceeded or not reached. Even when the Beeper is deactivated, other technical warning signals will be given (=> short circuit at the Output Current, => EEPROM defect). | ||||||||||||
10. Selection of Output Current or Output Voltage
A power supply is required for the operation of any Current Interface. To operate the Current Interface of the EDU (4-20 mA or 0-20 mA), either the EDU’s internal power supply or an external 24 Volt power supply can be used. | ||||||||||||
11. Selection of the measurement range for the current output signal
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12. Calculation of the Flow Rate average
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13. Selection of "Flow rate" or "Volume" for the Analog-Output signal
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14. Maximum Volume value for Analog-Output signal
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For the indication of volume as an Analog-Output signal, a maximum Volume value must be programmed in, by which the maximum value of the Analog signal will be achieved. In order to obtain the greatest possible resolution, the selection of the maximum volume value is made in discrete increments. These result from the number of slits in the Pulse Generator disc and the Gas Meter type, as well as from the different volume values per pulse. The possible increment is automatically determined according to the selected Gas Meter.
After this Menu point has been selected using the ENTER Button, the desired value can be programmed in using the SELECT Button. The lower and upper limits of the maximum volume value are presented in the following Table. By pressing the SELECT Button once, the volume value will be increased by the amount of the lower limit value. By constantly holding the SELECT Button pressed, the volume value will be automatically increased. The longer the Button is pressed, the faster the values will be increased. After releasing the Button and pressing it again, the counting process begins slowly again.
Once the desired value has been reached, it can be saved by pressing the ENTER Button. Warning: If nothing is entered within a 20 second period, the Program leaves the Set-up-Mode without saving a possibly newly selected maximum volume value.
Gas Meter Type | Lower limit = Increment [ltr] | Upper limit [ltr] |
TG 01 | 0,128 | 196,608 |
TG 05 | 0,64 | 983,04 |
TG 1 | 1,28 | 1.966,08 |
TG 3 | 3,84 | 5.898,24 |
TG 5 | 6,40 | 9.830,4 |
TG 10 | 12,8 | 19.660,8 |
TG 20 | 25,6 | 39.321,6 |
TG 25 | 32,0 | 91.520 |
TG 50 | 64,0 | 98.304 |
BG 4 | 12,8 | 19.660,8 |
BG 6 | 25,6 | 39.321,6 |
BG 10 | 64,0 | 98.304 |
BG 16 | 128 | 196.608 |
BG 25 | 128 | 196.608 |
BG 40 | 128 | 196.608 |
BG 100 | 128 | 196.608 |
Table: Upper and lower limits for the maximum volume values, by which the maximum value of the Analog signal can be achieved.
For a comprehensive description of the Analog Output: see Point 7.2
Programming via connected PC
All program settings which can be made via the Control Buttons can also be made via a PC. The PC must be connected to the RS232 Interface of the EDU. The advantage of this is that the input of figures can be done much more easily.
A further advantage exists in the possibility of being able to program-in further parameters with a PC (via the RS232 Interface on the EDU). The program can be adapted to match custom-made alterations to the Gas Meter being used, or application-specific parameters can be set. Examples are as follows:
- Number of pulses of the Pulse Generator per revolution of the Gas Meters measuring drum.
- Setting of a different flow rate value at which the maximum value of the Analaog Output can be reached.
- Decimal place positions for volume and flow rate indications.
In order to do this however, users require a detailed knowledge of the internal programming of the EDU. If needed, please contact either the Ritter Company or your local Ritter Distributor.
To transfer data from a PC to the EDU, the following is required:
- PC
- Serial Cable
- Terminal program (hyperterminal) eg Procom or Hyperterminal in Windows
When using a terminal program (e.g. Hyperterminal in Windows), a direct connection must be made via a COM interface (COM1, COM2 etc.) between the PC and EDU. The terminal program has to be adjusted to the COM interface being used. The EDU can be switched into the Set-up-Mode using the control codes Ctrl-C and Ctrl-E. Both control codes must be sent within 0.5 seconds. The EDU Display will indicate when the EDU is in Set-up-Mode.
The EDU “Enter-Function is then replaced by the RETURN key on the PC, and the “Select-Function by the space-bar. These two keys on the computer keyboard can be used in the same way as the above-mentioned Control Buttons on the EDU to change settings. Parallel to this, settings can also be changed using the Control Buttons on the EDU. All settings and alterations appear on the computer monitor (terminal or terminal program of the computer) and in the EDU Display.
If the EDU is in normal operational mode, the actual content of the EEProm can be read in Intel-Hex-Format using the Ctrl-R function. This string contains all created settings, as well as, if applicable, any special programming. Special programming can also be transmitted via the terminal program in Intel-Hex-Format to the EDU.
Subject to alterations