example manual

LMM Designs User Manual Multiflow – 2

LMM Designs

MULTI-FLOW

Serial No. Areo001

Model Example

Page 1


Index

PAGE 3

PAGE 4

PAGE 5

PAGE 6

PAGE 7

PAGE 8

PAGE 9

PAGE 10

PAGE 11

PAGE 12

PAGE 13

PAGE 14

PAGE 15

PAGE 16

PAGE 17

INTRODUCTION TO THE MULTIFLOW.

SPECIFICATIONS.

FRONT PANEL TEST FUNCTIONS AND TEST.

WORKING DISPLAYS

PROGRAM THE IDENTS AND UNIT LABELS.

PROGRAMMING THE MULTIFLOW.

CARDS FITTED

FREQUENCY INPUT CARD.

TABLE CHANNEL 1 FREQUENCY DATA



PT100 INPUT CARD

CALCULATION OF OHMS TO TEMPERATURE

TABLE TEMPERATURE TO VISCOSITY

TABLE TEMPERATURE TO S.G.

PAGE 18

PAGE 19

PAGE 20

RS232 / RS485 COMMAND STRUCTURE.

CODE EXAMPLE

PORT SETTINGS

PAGE 21 SPECIAL OPTIONS.

PAGE 22 SETTING FOR OPTIONS

PAGE 23 EQUATIONS AND DESCRIPTION

PAGE 24 VISCOSITY FLOW DIAGRAM.

PAGE 25 TERMINAL DIAGRAM.

Page 2


Introduction to the Linear Multi-Flow Meter

(LMM) Mark 2.0

Designed to meet the ever changing requirements of flow metering, the Multiflow can be tailored to virtually any flow application; from the most basic of rate and total indicators to a batcher or full control system, with computer and printer interface. The system will operate with most peripherals i.e. Flow sensors, Pressure, Temperature Etc.

Each LMM is hand built to your own individual requirements, by selection from the options listed below. Special software is written for each unit as and when required. Each function now has a stand alone card, up to 5 cards can be added to your system.

Frequency Input Card

Up to three frequency inputs can be accepted from flow sensors; each input with a 32 point linearisation curve for the derivation of flow and a programmable factor for unit conversion. Programmable cutoff points enable displays of both frequency and flow to be inhibited below pre-set values. The update is programmable from 0.02 seconds up to virtual infinity.

Analogue Input Card

16 bit Resolution

Up to six analogue process inputs 0-10V or 4 to 20mA, are available for use with sensors of temperature; flow; density; viscosity; pressures - absolute, barometric, gauge or differential, and other factors requiring compensation. Each input has a five point linearisation curve. For conversion to alternative mass units a programmable mass factor can be used.

Analogue Output Card

16 bit Resolution

Up to three analogue outputs 0-10V or 4 to 20mA, proportional to any desired parameter, are available for connection to remote facilities such as alarms, indicators, chart recorders,

PLCs and the like. The analogue output reference parameter may be configured by the user.

Pulse Ouputs

Three TTL or open collecter outputs are available for retransmission of rate, or for output of pulses per unit volume of total. These outputs, too, may be connected to remote indicators, totalisers or PLCs.

Relay Card

The Multi-flow can accommodate up to seven volt-free relays which can be deployed for alarm purposes. If the process includes a batching unit or controller, the relays can be used to control valves solenoids or pump starters

Communications

To monitor parameters or programme calibration data RS232, RS485 and interfaces can be incorporated. For connection to panel or desk mounted printers either a serial or parallel port can be incorporated, with the option of time and date indication.

The Main Display

The standard display is alphanumeric with red dot matrix characters, 152mm wide and

18mm high, which give an exceptionally wide viewing angle. The display itself comprises three fields: on the left, a maximum of five characters may be used to give the parameter identity; in the centre is the read-out of the quantity being measured; and to the right are the characters defining the units of measurement. These can be changed by the end user. User test routines, and buzzer.

Data Entry

All calibration data are entered by means of a hand-held infra-red keypad following a successful passcode entry.

To prevent incorrect data entry, when two Multiflow units are positioned in close proximity, the reception of the unit that is not being addressed can be inhibited by a sequence of keystrokes on the front panel keyboard of that unit.

Page 3


SPECIFICATION

Frequency

:

32 point linearization curve of frequency versus flow rate; by interpolation between points and, by extrapolation, from the first and last two points of the curve. An engineering factor is included for the conversion of units.

Frequency range

:

The default range is 0.5hertz to 65kHz with accuracy +/- 0.002Hz +/- least significant digit. A low cut off can be programmed by the end user which will allow the LMM to measure frequency down to 0.01 of a Hz. The crystal oscilator can be programmed to offset and errors by calibration.

Signal conditioning:

On request the LMM can take signals from contact closure (reed switch): sine wave; low level input to base of PNP transistor and two wire modulated current frequency inputs. The default is a standard TTL type signal input or voltage pulse.

Sensor Excitation Voltage:

An adjustable 5 to 24V dc output; 100mA each; available only when used on the mains ac supply. This can be set by the end user See section Titled HardWare.

Analogue Inputs

:

5 point linearisation, can be either 4 - 20mA or 0 - 10V dc.

Resolution:

16 bit

Accuracy:

+/- 0.001% of full scale

Analogue Outputs:

Either 4 - 20mA or 0 - 10V dc.

Resolution:

16 bit

Accuracy:

+/- 0.001% of full scale +/- least significant digit.

Pulse Outputs:

TTL or Open Collector outputs with a range of 1 hertz to 1 kHz

Relays:

Rating: 0.25A at 240Vac.

Power supply:

A mains input or dc input can be used to supply the LMM. The 110/240Vac is selectable on a switch inside the LMM see section entitled

Hardware

.

220 to 240Vac 50-60Hz will draw approx 18 mA (this depends on options fitted)

110 to 120Vac 50 -60Hz will draw approx 36 mA (this depends on options fitted)

12V dc will draw approx mA (this depends on options fitted)

24V dc will draw approx mA (this depends on options fitted)

Caution

Users are advised that although the equipment has protection and conforms to CE approvals, for trouble free operation the

Multiflow system should be connected to a clean power supply; ie free of noise and not in the same phase as heavy machinery.

Any machinery using heavy contacts in the immediate proximity of Multiflow should be suitably suppressed. Inductive loads switched by the volt-free relay contacts should be fitted with suitable snubber networks.

Page 4


FRONT PANEL TEST MODE

By pressing the at the same time the front panel set up and test mode are entered.

The display will show the following options by pressing the .

ENABLE

IR Y

KEY CLICK

N

User ALTER to enable Y and disable N the IR keyboard

User ALTER to select Y and disable N the audible keyclick

TEST REMOTE

MAN 1234

ALTER TO EXIT

Test the IR keyboard

Serial number of unit

Press ALTER to exit this mode

It should be noted that the exact order of each display will vary in the way that the cards are plugged in.

Page 5


Working Displays (when LMM is powered on)

When the unit is powered up the serial number is displayed for approximately 5 seconds then the first display line is shown. date time

F

1

ROS

1

STO

1

KF

1

F

2

ROS

2

STO

2

KF

2

F

3

ROS

3

STO

2

KF

3 ohms

1

Use the up ( )key or the down ( ) key to scroll through the resultant displays see table below. The same keys on the hand held remote control will perform the same function.

STANDARD Display Description of resultant displays ident result units

rt

1 mas

1 tv

1 tm

1 rt

2 mas

2 tv

2 tm

2 rt

3 mas

3 tv

3 tm

3 temp

1

Visc s.g n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.n n.nnn n.nnn

Volume flow rate channel 1

Mass flow of turbine 1

Total volume of turbine 1

Total Mass of turbine 1

Volume flow of turbine 2




Volume flow of turbine 3




Temperature from Pt100

Viscosity of fluid

Specific Gravity of fluid

The left direction key ( ) or the right ( ) can be used to toggle between the STANDARD DISPLAYS

(see table above) and the RAW DISPLAYS (see table below). A message is momentarily displayed indicating which section is selected. Use the direction keys to select a display.

RAW Display Description of resultant displays ident result units

RELAYS dd/mm/yyyy

Hh:mm:ss manifold channel volume n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn n.nnn

1

2

3456

Date

Time

ON Current state of the manifold system ON or OFF

2 Current running channel from 1 to 3

ON Volume ON or Mass ON

Hz Frequency of turbine 1 (Hz)

Calculated Roshkoe value for turbine 1

Calculated Strouhal value for turbine 1

Corrected K factor for turbine 1


Corrected Roshkoe factor for turbine 2




Corrected Roshkoe factor for turbine 3



Ohms from Pt100

Show the current sate of the relays

To Change idents and units see section titled

DISPLAY IDENTS AND UNITS

Page 6


PROGRAMMING THE IDENTS AND UNIT LABELS

1) When in all mode, select the display to be altered using the keys. Note if you are a curve menu you change the units only, this will change all points in that curve.

2) Press the

SHIFT

key followed by the

EXP/UNIT

key and the cursor will begin to flash at the far right hand side of the display.

3) Use the keys to select the required character for that position and the cursor. Using these key, the units on the right hand side may be altered.

keys to alter the position of the

4) To move the cursor to the left hand side of the display press the

ALTER

key and the cursor will move across.

5) Use the keys to select the required character for that position and the keys to alter the position of the cursor. Using these keys the display designation may be altered.

6) Once the desired characters have been programmed then pressing the

ENTER

key will store them in that display.

7) Use the keys to select another display to be altered and repeat the above stages.

IMPORTANT NOTE: Where a maximum number of digits are to be displayed e.g on total, it is advised that the display designation is limited to four or fewer characters, otherwise the displays will overlap causing apparent corruption. If this should occur then the number of characters for the display designation should be reduced, after which the display will return to normal.

In some cases the unit may prevent changes to the display. This is because the instrument needs to have these displays fixed to run correctly. See any special instructions supplied.

Page 7


PROGRAMMING THE LMM

ENTERING THE PROGRAMMING MODE.

Press the SHIFT key on the infra-red controller, followed by the CODE Key. ‘

CODE ****’

will be displayed. A four digit code can now be entered. On each press of a key the

‘*’

will change to

‘+’

in sequence from left to right.

When all four

‘*’

have been set the code is automatically checked. If the display shows ‘WRONG CODE’ then try again making sure that you are entering the correct code, as each instrument has a different code setting. If a mistake is made during setting, then use the CLEAR key and try again.

If you are sure that the code is correct and the instrument still shows WRONG CODE then it is probable that the batteries need changing in the hand held remote control.

If you press the ALTER key by mistake the display will revert to normal after approx. 20 seconds. Pressing the keys will have the same effect. Pressing any other key will reset the timer allowing sufficient time to enter each digit of code.

THE CODE NUMBER

The code number for each instrument is taken from the last 4 digits of the serial number. The serial number can be found on the front page of this manual, on the rear of the instrument, and is also displayed when the instrument is first powered up, and finally by entering the Front panel Test routine.

For complete security it is recommended that the remote controller should be kept in a safe and secure place.

UNABLE TO ENTER A CODE?

1) Enabling and Disabling the Infra-red hand held keypad.

The infra-red keypad will work with any LMM unit and therefore it may be necessary to disable this function on one unit where they are in close proximity. To LOCK OUT the infrared keyboard you must enter the Front Panel Test

Routine and select N for the ENABLE IR control. Once locked out, the infra-red keypad is totally inactive on that particular unit and the lock LED will be lit in the lower square panel. With the REMOTE OFF the displays may still be viewed by means of the front panel keys. To restore operation of the infra-red keyboard use the Front Panel Test

Routine and select Y to the ENABLE IR menu.

2) Automatic LOCK OUT

In some cases the instrument itself will inhibit the ALTER key as it may be performing a sequence of events that can not be interrupted, i.e BATCHING. Please see the special instructions if applicable .

UNABLE TO USE THE KEYS or KEY BOUNCE

If you are experiencing

key bounce

or you are

unable to use the keys

then there is probably interference with the infra-red remote control. Problems may occur when trying to operate the unit in

direct sunlight;

or using sodium lights etc. If there are problems then please contact your supplier.

Page 8


CARDS FITTED

1B

1C

2A

2B

2C

3A

3B

3C

4A

4B

4C

This option is for information only, pressing ALTER will display the first card slot (1 to 5) of the fitted cards. As you use the

↑ ↓ each slot is displayed as N(1 to 5)A,B or C the status (empty or type of card fitted) is displayed.

Example of cards fitted.

1A

Hz/u

Manifold Hzv Indicating the first slot has a Frequency Card set up for Manifold Operation in

Manifold Hzv

Manifold Hzv

Ana-Input

Empty

Empty

Relay

Empty

Empty

Empty

Empty

Empty

Channel 2 as above

Channel 3 as above

Slot 2 has an Analogue input card fitted

Indicating no further options in this slot

Slot 3 has a relay card fitted the number of relays depends on those fitted

5A

5B

5C

Empty

Empty

Empty

Each card and alpha identifier will depend on the card and its function. The user can use this information to check the integrity of the card fitted, its operation and the fact that it is communication with the main hub.

Page 9


FREQUENCY CARD EDIT CURVES

This section describes how to program any of the potential curves in the system.

1) Display shows ‘EDIT CURVE 1’ or 2 or 3.

2) Press ALTER to display the first point of calibration. Then use the keys to select the required calibration point to be entered or altered. The left hand display will always show the curve and point number i.e. C

101

, the right hand display will show the units, i.e. Hz, Hzv, L/M etc. This label can be cahnged by pressing the SHIFT then UNIT key.

3) To enter/alter data either press the CLEAR key or enter a numeric value. The display will show SET on the left indicating that data is being entered. To obtain +/- values press the SHIFT key followed by the +/- key. To obtain

EXP values enter the numeric value followed by the EXP key and the exponential value. Press the CLEAR key to delete incorrect data entry.

4) Having entered the correct value, press the ENTER key and the entered data with the channel and point number will be displayed

5) Use the key to select the next point of calibration or press the ENTER key to exit this mode and return to the list of program options.

FREQUENCY CHn SETUP

To set up a frequency channel the following will apply, however some items are optional and may not appear in your specific application.

Display shows CHn SETUP, pressing alter and using the will show options. Use ALTER to change the values.

FRQ CUT OFF When below this value of Frequency then FRQ = 0.0

VOL CUT OFF

MASS CUT OFF

When below this value of volume flow then Vol Flow = 0.0

When below this value of mass flow then Mass Flow = 0.0

TIME BASE

UP DATE TIME

FRQ CONSTANT

VOL FACTOR

MASS FACTOR

DP n

ALPHA

Used to calculate flow rate in Kfactors or Total in flow 1, 60 or 3600

0.02 sec to 9999 secs for update control

Default 2.0

-7

used to adjust the internal crystal frequency.

Multiplier Volume flow rate by this factor

Multiplier Mass flow rate by this factor

Decimal point positon 0 to 4 (use the ALTER key to change)

Alpha factor used for Stro and Ros calculation.

CAL_TEMP Calibration temperature of sensor used for Stro and Ros

SORT CURVE

Through out the system each curve can be sorted or left as entered. Each curve works from lowest entry to highest entry, if entered this way then the sort routine does not need to be used. If you add a point that is not the highest then use the sort curve function. If this function is not used it will allow the user to enter ‘S’ or similar curves to be tracked.

RESET TOTALS

This option allows the user to clear totals, please note that there maybe more than one total, i.e. Volume and Mass totals, each needs to be cleared! Use the ALTER key when on a RESET VOL 0=Y option to scan for the next total.

Page 10


BLANK TABLE INTO WHICH DATA MY BE WRITTEN FOR REF.

Curve 1 Input Hz

□

Hz/u

□

Other

□

_________

Flow Rate____________________

01

02

03

04

21

22

23

24

25

26

27

28

29

30

31

32

05

06

07

08

09

10

11

12

13

14

15

16

17

18

19

20

25

26

27

28

21

22

23

24

29

30

29

30

17

18

19

20

13

14

15

16

09

10

11

12

05

06

07

08

01

02

03

04 exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp

Page 11


21

22

23

24

25

26

27

28

29

30

31

32

Curve 2 Input Hz

□

Hz/u

□

Other

□

_________

Flow Rate____________________

09

10

11

12

13

14

15

16

17

18

19

20

01

02

03

04

05

06

07

08 exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp

13

14

15

16

17

18

09

10

11

12

19

20

05

06

07

08

D01

02

03

04 exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp

25

26

27

28

21

22

23

24

29

30

29

30 exp exp exp exp exp exp exp exp exp exp exp exp

Page 12


21

22

23

24

25

26

27

28

29

30

31

32

Curve 3 Input Hz

□

Hz/u

□

Other

□

_________

Flow Rate____________________

09

10

11

12

13

14

15

16

17

18

19

20

01

02

03

04

05

06

07

08 exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp

13

14

15

16

17

18

09

10

11

12

19

20

05

06

07

08

D01

02

03


25

26

27

28

21

22

23

24

29

30

29

30 exp exp exp exp exp exp exp exp exp exp exp exp

Page 13


PT100 INPUT CARD EDIT CURVES

This section describes how to program any of the potential curves in the system.

1) Display shows ‘Temperature’, ‘Viscosity’ ‘S.G. set’, ‘Setup inputs’ or another option

2) Press ALTER to display the first point of calibration. Then use the keys to select the required calibration point to be entered or altered. The left hand display will always show the curve and point number i.e. C

101

, the right hand display will show the units, i.e.

O

C, CTS, S.G. etc. This label can be changed by pressing the SHIFT then UNIT key.

3) To enter/alter data either press the CLEAR key or enter a numeric value. The display will show SET on the left indicating that data is being entered. To obtain +/- values press the SHIFT key followed by the +/- key. To obtain

EXP values enter the numeric value followed by the EXP key and the exponential value. Press the CLEAR key to delete incorrect data entry.

4) Having entered the correct value, press the ENTER key and the entered data with the channel and point number will be displayed

5) Use the key to select the next point of calibration or press the ENTER key to exit this mode and return to the list of program options.

PT100 INPUT

This allows the user to setup the PT100 input for calibration, the user must connect a know resistance or RTD calibrator to the PT100 input (2, 3 or 4 wire). By setting the PT100 Factor to 1.0 the user should then exit the programming and observe the ohms (which is now displaying the bits). Now divide the actual resistance by the observed bits. This is now the factor for the PT100 Factor. The temperature calculation from the resistance is automatic and uses a 2 nd

order polynomial e

Display shows INPUTS, pressing alter and using the will show options. Use ALTER to change the values.

PT100 FACTOR Input bits X this factor = Ohms

Repeated up to 6 ANA per card

SORT CURVE ANA VIS TEMP etc.

Through out the system each curve can be sorted or left as entered. Each curve works from lowest entry to highest entry, if entered this way then the sort routine does not need to be used. If you add a point that is not the highest then use the sort curve function.

Page 14


CALCULATION OF OHMS TO TEMPERATURE.

The calculation from the measured resistance in ohms to the temperature is carried out by a standard polynomial equation, a separate set of constants are used from -200 o

C to 0 o

C than from 0 o

C to +200 o

C.

Page 15

21

22

23

24

25

26

27

28

29

30

31

32

Temperature o

C

□ o

F

□

09

10

11

12

13

14

15

16

17

18

19

20

01

02

03

04

05

06

07



Viscosity CTS Other

□

_________

25

26

27

28

21

22

23

24

29

30

29

30

13

14

15

16

17

18

09

10

11

12

19

20

05

06

07

08

D01

02

03


Page 16

21

22

23

24

25

26

27

28

29

30

31

32

Temperature o

C

□ o

F

□

09

10

11

12

13

14

15

16

17

18

19

20

01

02

03

04

05

06

07

08


S.G. exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp exp

25

26

27

28

21

22

23

24

29

30

29

30

13

14

15

16

17

18

09

10

11

12

19

20

05

06

07

08

D01

02

03


Page 17


RS232 / RS485

COMMAND STRUCTURE.

Viewing data from the Multiflow;

All data is send and received as ASCII HEX pairs, the maths used in PIC Hex format, 2 example routines are included to convert this data into PC or ASCII strings. The PIC Hex format is always 4 bytes and represents a 32-bit floating-point number system. To read data use the following format.

Description

String

Hex

ASCII Hex

ID a

61

View Hub/Slot Reg/Mem

V

56

H

48

36 31 35 36 34 38

R

52

35 32

Slot Address

00A0

00A0

No.Bytes

04

04

30 30 41 30 30 34

CR

CR

0D

0D

Notes: Reg/Memory allows the user to view live data within the Processors own working registers or the Flash memory address space that is used to store constant and curve data. The Hub is the main processor (the card connected to the serial link), whilst the SLOTs need to be addressed as follows.

Description

String

Hex

ASCII Hex

ID a

61

View

V

56

Hub/Slot

S

49

36 31 35 36 34 39

Reg/Mem

M

4D

34 44

Slot

04

04

30 34

Address

0600

0600

30 36 30 30

No.Bytes

04

04

30 34

CR

CR

0D

0D

7

8

9

10

SLOT ID Hex Ascii Hex Position

4 04 30 34 1A

5

6

05 30 35

06 30 36

1B

1C

08 30 38

09 30 39

0A 30 41

0C 30 43

2A

2B

2C

3A

15

16

17

18

11

12

13

14

0D 30 44

0E 30 45

10 31 30

11 31 31

12 31 32

14 31 34

15 31 35

16 31 36

3B

3C

4A

4B

4C

5A

5B

5C

General Address.

To obtain the list address for you instrument please send email to [email protected]

to request a complete list, also include are the conversion routines of the PicHex to standard PC/Ascii data.

Page 18


Code Examples:

Cal_dec(returned decimal value, asciihex string from input buffer 8 bytes, number of decimal places, returned ascii string) cal_dec(a, Left$(rx_buff, 8), 3, b)

Label27.Caption = b

Sub cal_dec(dec, result, dp_pos, result_str)

dec = 0

eb = Left$(result, 2)

If eb = "00" Then GoTo the_res_is_zero

sethex = Right$(result, 6)

e = Val("&h" + eb) - 127

bin_data = ""

For p = 1 To 6

Select Case UCase(Mid$(sethex, p, 1))

Case "0" nibble = "0000"










Case "A" nibble = "1010"

Case "B" nibble = "1011"

Case "C" nibble = "1100"

Case "D" nibble = "1101"

Case "E" nibble = "1110"

Case "F" nibble = "1111"

End Select

bin_data = bin_data + nibble

Next p

If Left$(bin_data, 1) = "1" Then

sign = "-"

Else

sign = ""

End If

dec = 1

For p = 2 To Len(bin_data)

Bit = Mid$(bin_data, p, 1)

If Bit = "1" Then dec = dec + 2 ^ -(p - 1)

Next

dec = (2 ^ e) * dec

wiv_sign = sign + Str(dec)

dec = Val(wiv_sign) the_res_is_zero:

Select Case Val(dp_pos)

Case 1

result_str = Format(dec, "0.0")

Case 2


Case 3


Case 4


Case 5


Case 6


Case 7


Case 8


Case 9


Case Else

result_str = Format(dec, "0")

End Select

End Sub

Page 19


PORT SETTINGS.

The display shows menu ‘SETUP COMMS’, press ALTER to select the possible sub menus

BAUD 19200 Baud rate change using ALTER to 9600, 1200 or 19200

READ

ID

RS485

COMMS

PIN SETTINGS.

9 way D,

RS232

Pin 2 RX

Pin 3 TX

ONLY a

FAST

FAST

Pin5 0v

At present the system is set to read only

Use ALTER to scan Ids a to z lower case only

Delay for bus transceiver FAST MEDIUM or SLOW

Delay between Char output FAST MEDIUM or SLOW

RS485

B

A

0v

Page 20


SPECIAL OPTIONS

SETTING Real Time Clock.

Setting the real time clock. When either the time or the date is viewed pressing ALTER will enable the user to set the time/date. When ALTER is pressed the cursor will flash at the Day you can enter the dd/mm/yyyy by pressing the numeric keypad. Pressing the ENTER key will load the RTC with this information. The same applies to the time.

MANIFOLD ON/OFF

The manifold system can be turned on and off, this can only be done with the Infra Red Keyboard for safety reasons.

When the system is in MANIFOLD ON, the operation of switching from each meter will be automatic, based on the user entered values. These trip points are in frequency for any Hz/u meter.

When this display is showing, pressing ALTER on the IR keyboard will toggle this selection, ON or OFF. When off a manual option is enabled see below.

As each meter is selected a relays will energise, in a fail safe mode the valves should be open with no power and power to close them ;

Low flow meter on Frequency Channel 1, relays 1 and 2 energises closing valves for mid and high flow.

Middle flow meter on Frequency Channel 2, relay 2 energised closing the valve for the high meter

High flow meter on Frequency Channel 3, both relays off

MANIFOLD AUTORANGING TRIP POINTS

Under the menu system the display will show SETUP AUTO pressing alter will display the following by using the

↑↓

.

1

2

3

2

↑

2

↑

3

↓

2

↓

1

0.0 Hz

0.0 Hz

0.0 Hz

0.0 Hz

This shows the trip point in Hertz from meter 1 (Chan 1 low flow) to 2

This shows the trip point in Hertz from meter 2 (Chan 2. medium flow) to 3

This shows the trip point in Hertz from meter 3 (Chan 3. high flow) to 2

This shows the trip point in Hertz from meter 2 (Chan 2. medium flow) to 1

The user should take care to enter a reasonable switch points so as to avoid ‘hunting’ between the channels.

CHANNEL –1-

This display shows the current channel number running, however if the MANIFOLD OFF option is running then pressing the ALTER key will change the channel number, (relay and analogue output will also change)

RELAYS MANIFOLD

Relay 1 ON : Relay 2 ON = Channel 1, Low flow meter

Relay 1 OFF : Relay 2 ON = Channel 2, Medium flow meter

Relay 1 OFF: Relay 2 OFF = Channel 3, High flow meter

Page 21


VOL ON / MASS ON

Pressing ALTER (IR Keyboard) will select the VOLume or MASS to be running. The effect is;

1/ Each time the AUTO MANIFOLD changes the display will change to the new channel and display either the VOLume or the MASS flow rate of the target channel number.

2/ If fitted the analogue output will represent Volume or Mass flow rate.

RELAYS MANIFOLD

Relay 1 ON = Channel 1, Low flow meter

Relay 2 ON = Channel 2, Medium flow meter

Relay 3 ON = Channel 3, High flow meter

TOTAL INHIBIT INPUT.

By shorting SW1 terminals 3 and 6 on the Hub Con the totalisation on all inputs will be inhibited from counting up.

Page 22


Special Instructions

Brief description of unit calculations

For each input there is a linearization curve which must be programmed for correct operation of the unit. It should be noted that data entries for each curve may be in any order. On completion of programming and reverting to the normal running display , the unit will sort all data into numerical order. This may result in data moved to a different point if they were not entered in numerical in the first instance.

The inputs and linearization graphs are processed as below.

A Pt100 input is provided for measuring the fluid temperature, which is converted internally to a 4-20mA signal.

This is then processed using the five point mA versus temperature to obtain the temperature, after which the 30 point temperature versus viscosity curve is used to obtian the viscosity.

The temperature measurement is also used to obtain the Strouhal and Roshkoe numbers, as below, which are in turn used to compensate the K-factor.

STROUHAL NUMBER

= 1 + ( 3x Alpha Delta T )

ROSHKOE NUMBER

= 1 + ( 2 x Alpha Delta T )

Where:

Alpha = temperature coefficient

Delta T = (Calibration Temperature - Actual Temperature)

Three voltage pulse inputs are provided for connection to three turbine pre-amplifiers.

The frequency of each turbine input is measured, divided by the viscosity to obtain the

uncorrected

Hz/Viscosity.

This value is then multiplied by the Roshkoe number to obtain the

corrected

Hz/Viscosity and used to obtain an uncorrected turbine K- factor using the 30 point frequency/viscosity versus K-factor curve. The derived value is then multiplied by the Strouhal number to obtain the

corrected

K-factor.

The measured frequency is then divided by the corrected K-factor to obtain the flow rate in volume per second which may then be multiplied by the desired time base e.g 60 for volume per minute.

Using the 30 point temperature versus S.G curve the volume flow rate is converted to mass flow rate which is then totalised.

Totalisation may be stopped by the shorting together of terminals 34 and 36 at the rear terminal block.

The unit may operate in either the autoranging mode,

MANIFOLD ON

; or in the non-autoranging mode,

MANIFOLD

OFF

.

In the autoranging mode, three valve control relays are used to select the correct turbine in accordance with the programmed frequency trip points. This procedure is described in detail in the

AUTORANGING

section.

As the Multiflow changes the relay contacts it automatically displays the status of the turbine to which it has switched. For example, if while running on turbine 1 the flow is increased to switch to turbine 2, the ident display will change to rt

2

or mas

2

according which mode is operational at that time. In autoranging mode the flow rate of all turbines I totalised on tot

1

. In non-autoranging mode the flow rate is referred to the ident applicable to the turbine in operation.

Page 23

Hz/u – Kfactor System Diagram

Input Frequency


Input Temperature

Five point graph

Milliamp Input

versus

Temperature

Function

Hz / Viscosity

Hz / u (uncorrected)

30 point graph

Temperature (T)

versus

Viscosity ( u

)

Hz / u (corrected)

= Hz / u x Roshkoe Roshkoe = 1+ 2

α

ð

T

30 point graph

Hz / u

versus K factor (uncorrected)

K factor (corrected)

= K factor x Strouhal

Volume flow

= Hz / K factor

Strouhal = 1+3 α

ð

T

Strouhal number = 1 + 3

α

ð T

Roshkoe number = 1 + 2

α

ð

T

Where :

α

= Temperature co-efficient of expansion

ð T = (Calibration temperature - Actual temperature)

The above are programmable

Time base x1

Flow / sec

Time base x 60

Flow / min

Time base x 3600

Flow / hour

= other engineering units

Density (SG) x Vol flow

= Mass Flow

Mass Factor

Mass flow x factor

= other engineering units

Page 24

Optional

30 point graph

Temperature

versus

Density


TERMINALS

10

11

12

13

14

6

7

8

9

2

3

4

5

TB FREQUENCY

1

SLOT 1

SPECIAL IP

SPECIAL IP

EX. VOLTAGE

ANALOGUE IN

SLOT 2

+ PT100 supply

+ PT100 sense

- PT100 sense

+ SIGNAL 1

- SIGNAL 1 or 0v

- PT100 supply

RELAYS

SLOT 3

NO RELAY 1

C RELAY 1

NO RELAY 2

C RELAY 2

NO RELAY 3

0v

EX. VOLTAGE

+ SIGNAL 2


0v

EX. VOLTAGE

+ SIGNAL 3


0v

C RELAY 3

Mcon1

123456

5 4 3 2 1 SLOT NUMBER

Mcon1 1

2

+24vDC input from 100mA to 200mA (depends on cards fitted)

0v

3

4

5

6

0v

+24vDC output repeated from input 1 or when on Main supply

Optional relay C

Optional relay NO

Mains input 80 to 265 ac auto. Fuse 1.0 amp.

HubCon

1

2

3

4

5

6

Fused 5vDC

Open Collector Output

SW1 input

SW2 input

SW3 input

0v

Page 25

example manual

LMM Designs

MULTI-FLOW

Model Example

Index

Introduction to the Linear Multi-Flow Meter

Frequency Input Card

Analogue Input Card

Analogue Output Card

Pulse Ouputs

Relay Card

Communications

The Main Display

Data Entry

SPECIFICATION

Frequency

Analogue Inputs

Analogue Outputs:

Pulse Outputs:

Relays:

Power supply:

FRONT PANEL TEST MODE

Working Displays (when LMM is powered on)

PROGRAMMING THE IDENTS AND UNIT LABELS

PROGRAMMING THE LMM

ENTERING THE PROGRAMMING MODE.

THE CODE NUMBER

UNABLE TO ENTER A CODE?

UNABLE TO USE THE KEYS or KEY BOUNCE

CARDS FITTED

FREQUENCY CARD EDIT CURVES

SORT CURVE

RESET TOTALS

PT100 INPUT CARD EDIT CURVES

SORT CURVE ANA VIS TEMP etc.

Special Instructions

TERMINALS

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