Operating and Calibrating Instructions

 Acme Micrototalisers

 5000 and 5200 Series with Ticket Printer



 
 
 
 

OPERATING INSTRUCTIONS
The microelectronic totaliser will calculate and display both a delivery total and a continuous (cumulative) total. 
DELIVERY TOTAL
Unless otherwise indicated the display will show the delivered total 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 the TOTAL 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 continue totalising. 

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. 
CALIBRATION
In order to calibrate the instrument a dedicated calibration unit must 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 totaliser into calibration mode enabling calibration to be performed. To allow test runs to be made without disconnecting the calibration unit the input from the pulser is connected to the 14 pin connector at the rear of the calibrating unit and the calibration switch set to NORMAL. A momentary contact pushbutton switch labelled MODE selects one of six calibration sequences. The sequences are:- 
  1. Preset the continuous total 
  2. Program the K-factor (whole numbers only) 
  3. Program the K-factor (decimals only) 
  4. Program the non-linearity correction factors 
  5. Program the meter identification no.(serial nos. 052001 and beyond) The third switch ,if fitted, is a three position toggle switch which selects dummy temperature sensors for 15oC and 45oC and is only used when calibrating temperature compensated totalisers.
PRESET THE CONTINUOUS TOTAL
Press the calibrator MODE button and the left digit will flash. This digit can be incremented by pressing the TOTAL button on the totaliser. The next digit is selected by pressing the RESET button 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"
METER IDENTIFICATION
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. 
APPENDIX "A"
Adjusting the K-Factor 
When calibrating the instrument against a known measured volume, the indicated volume on the totaliser is compared with the actual known volume delivered into the measure and the percentage variation is calculated as follows: 

Indicated volume x 100
Measured volume 

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. 

Example: 

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%)
200 

If the quantity on the totaliser reads 199 litres then the K-factor is multiplied by: 

201 = 0.995 (or -0.5%)
200 
APPENDIX "B"
Rate Dependent Calibration
The correction for non-linearity of the flowmeter is best described through the following example. 

A typical flowmeter has had the K-factors determined by calibration as indicated in table 1 

TABLE 1

Frequency (Hz)  K-factor (pulses per litre) 
50  35.7963 
150  35.5569 
300  35.4045 
400  35.4204 
490  35.5001 

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: 

TABLE 2

Frequency (Hz)  K-factor (as a % of 35.4682) 
50  +0.93 
150  +0.25 
300  -0.18 
400  -0.13 
490  +0.09 

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. 

TABLE 3

Range  Frequency (Hz)  NLCF (% dev)  K-factor 
1  420  -00.15  35.4150 
2  255  00.00  35.4682 
3  185  00.20  35.5391
4  140  00.40  35.6100 
5  105  00.60  35.6810 
6  075  00.80  35.7519 

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 micrototaliser by means of a data cable and a separate power connection. The printer operates 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 achieve the higher voltage. The printer may be serviced by several totalisers each programmed with its own identifying number (see section on calibration). On completion of a delivery the following steps must be followed:- 
  1. Complete the delivery procedure. 
  2. Make sure the release light is on at the printer panel. If not, press the pad marked RELEASE 
  3. Insert the ticket into the slot holding it firmly against the right hand guide and pushing forward against the rear stop. 
  4. Press the RESET button on the totaliser (remember more than one press may be required if the instrument has silver buttons). The ticket will be printed and move forward. 

    5.  

     
     
     
     
     
     
     

    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 button. 

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:
 
 

Each Delivery Delivery Summary
METER NO:** METER NO:**

POWER INTERRUPTS**
DENSITY 0.***KG/L METER DISCONNECTS**
ACC. TOTAL ***** LITRES DENSITY 0.***KG/L
QUANTITY *****.* LITRES ACC. TOTAL *****
LITRES
DELIVERY NUMBER TOTAL DELIVERIES ****