Operating and Calibrating Instructions
5000 and 5200 Series with Ticket Printer
|The microelectronic totaliser will calculate and display both a delivery total and a continuous (cumulative) total.|
|Unless otherwise indicated the display will show the
in one tenth litres up to a maximum of 99999.9.
For totalisers with yellow pushbuttons, to reset to zero the RESET button on the front panel is depressed for a period of not less than 1 second.
For totalisers with silver buttons giving a one shot pulse of short duration (approximately 3/4 of a second) it is necessary to press on the button at least twice at intervals of about half of one second in order to give the required continuous pulse length. If the first pulse decays before the second pulse is started it is necessary to repeat the process until a continuous pulse of one second is achieved.
|CONTINUOUS (CUMULATIVE) TOTAL|
|The continuous (cumulative) total is displayed by depressing
button on the front panel. The maximum which may be displayed is 999999
in whole litres after which the display will roll over to zero and
For totalisers with yellow buttons the TOTAL is displayed as long as the button is depressed. For totalisers with silver buttons the total remains displayed for approximately 3/4 of a second. If a longer display time is required it is necessary to keep pressing the button at half second intervals.
The total is only displayed whilst the button is being pressed and cannot be reset except when the totaliser is in calibration mode.
|In order to calibrate the instrument a dedicated calibration
be connected to the input (14 pin) connector. The calibration unit may
have two or three switches the first of which is a two position toggle
switch which in the CALIBRATE or CAL position sets the
into calibration mode enabling calibration to be performed. To allow
runs to be made without disconnecting the calibration unit the input
the pulser is connected to the 14 pin connector at the rear of the
unit and the calibration switch set to NORMAL. A momentary
pushbutton switch labelled MODE selects one of six calibration
The sequences are:-
|PRESET THE CONTINUOUS TOTAL|
|Press the calibrator MODE button and the left digit
This digit can be incremented by pressing the TOTAL button on
totaliser. The next digit is selected by pressing the RESET
and incrementing as before.
Continue this process until all digits have been set. If a digit does not need to be reset a second push of the RESET button will move the sequence to the following digit. In the case of the totaliser with silver buttons allow one second between successive pushes on the RESET button to avoid overlapping pulses.
After the continuous total has been set and the right digit is still flashing, press the RESET button once more to store the new figure in the memory. The display will blank for approximately one second. Failing to perform this last operation will leave the previous total in the memory and the entire process must be repeated.
The next calibration sequence is selected by pressing the calibrator mode switch.
|PRESET THE K-FACTOR|
|To calculate the desired K-factor refer to APPENDIX "A"
a. Whole number portion
The display will show 5 whole numbers of the K-factor with the decimal point to the right of the number.The increment process is repeated as before using the RESET and TOTAL buttons. For instruments reading in one tenth litres the K-Factor must be between 10 and 65535.
b. Decimal portion
This mode sets the numbers following the decimal point and operates in the same way as the previous sequence. The decimal point is now to the left of the display and the number has four digits only.
|NON LINEARITY CORRECTION FACTORS|
|This option is normally not used and is disabled by setting F1 to zero (000). At this setting the programmed K-factor applies to all flow rates. If, however, non linearity correction factors are required refer to APPENDIX "B"|
|The totaliser may be allocated an identifying number from 00 to 99. After exiting the temperature calibration mode the display will show "1 **" where ** is the identifying number of the totaliser and the first of those digits will be flashing. The number may now be incremented and entered into memory as previously described. The number will not be printed in either the delivery or summary format if the number set is 00.|
|CALIBRATION FOR TEMPERATURE COMPENSATION|
|If the temperature input cable between the totaliser and probe is short (less than 1 to 2 meters) a shorting link is provided on the calibrating unit and must be in place to short out the resistance offered by the sensor. Plug the calibration unit into the totaliser, do not connect the wiring to probe into the calibration unit. Switch the unit in "Cal" mode, then repeatedly press the mode button until "t15" appears on the totaliser screen. Set the temperature switch on the calibration unit to15 and press the totaliser total button. The display will blank out for a couple of seconds then re-appear. press the calibration unit mode button once, "t45" will appear on the totaliser screen, set the temperature switch to 45 and press the totaliser total button. The totaliser display will blank out then re-appear. If "fail" appears on the screen a fault is indicated in the totaliser or calibration unit.|
|TERMINATING THE CALIBRATION PROCESS|
|To exit the calibration mode set the toggle switch on the calibrating unit from CAL to NORMAL.|
Adjusting the K-Factor
|When calibrating the instrument against a known measured
indicated volume on the totaliser is compared with the actual known
delivered into the measure and the percentage variation is calculated
Indicated volume x 100
The K-factor is then adjusted by the above amount
e.g. If the indicated volume is GREATER than the measured volume the K-factor must be INCREASED by the percentage error. If the indicated volume is LESS than the measured volume then the K-factor must be DECREASED by the percentage error.
Assuming the calibration measure has a known proven volume of 200 litres and the delivered quantity on the totaliser reads 201 then the K-factor is multiplied by:
201 = 1.005 (or +0.5%)
If the quantity on the totaliser reads 199 litres then the K-factor is multiplied by:
201 = 0.995 (or -0.5%)
Rate Dependent Calibration
|The correction for non-linearity of the flowmeter is best
through the following example.
A typical flowmeter has had the K-factors determined by calibration as indicated in table 1
The non-linearity calibration programme requires that one basic K-factor is programmed and eight other K-factors are expressed as a percentage deviation of this figure.
Hence if a reference K-factor of 35.4682 is programmed, table 1 can be expressed as follows:
The above values can be plotted and a calibration curve drawn through these points. The curve can now be approximated by nine frequency ranges with constant k-factors. The k-factor used for the highest frequency range must be the reference k-factor. From this approximation table 3 is derived.
The microprocessor now uses the reference K-factor for frequencies above 420 Hz, 35.4150 for frequencies 255 to 419, 35.4682 for 255 to 185 and so on
|SLIP PRINTER (Model no. TM290 II)|
|The slip printer is a separate unit connected to the
by means of a data cable and a separate power connection. The printer
from a power source of 24 volts DC. Some vehicles are fitted with a 12
volt DC battery and it is necessary to fit a step-up converter to
the higher voltage. The printer may be serviced by several totalisers
programmed with its own identifying number (see section on
On completion of a delivery the following steps must be
Note: Allow four seconds from the time the delivery has ended to the time the RESET button is pressed
|PRINTING A DELIVERY SUMMARY|
|Repeat steps 2 and 3 but press the TOTAL button
instead of the RESET
CAUTION: DO NOT INITIATE EITHER PRINTING PROCESS (STEP 4) UNLESS THE TICKET HAS BEEN INSERTED AND THE "PAPER OUT" LIGHT IS OFF
A typical printout would be: