Titan Metraflow 240-020 User manual

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SECTION
CONTENTS
PAGE NUMBER
1
General
3
2
Order Codes
3
3
Installation
3
4
Set Up
6
5
Technical Specification
26
6
Troubleshooting
29

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©Titan Enterprises Ltd 2018 www.flowmeters.co.uk MetraflowManual_v1219
The Titan Metraflow flow meter represents a new generation of through bore, time of flight ultrasonic
flowmeters that uses patented breakthrough technology to offer a wide ranging yet accurate meter. It is
ideal for any application which requires a truly non-contact high purity fluid path with a single unbroken,
high quality PFA tube being the only contact material with the fluid to be measured.
The user must make sure that the flowmeter selected is suitable for the application and that the chemical
compatibility, temperature and pressure requirements are within the Metraflow’s operating range.
Please check the model number before proceeding.
All meters can be programmed and monitored via the USB connection.
NOTE: THE METER IS NOT HYGIENICALLY CLEANED
240-020 1/8” PFA tube 20 to 1000 ml/min 20 Bar 60°C
240-025 1/4” PFA tube 100 to 5000 ml/min 13 Bar 60°C
Dimensions:
Connections:
Standard units supplied with:
150mm PFA hose ends
1.0m length 8 way cable
General
1
Order codes
2
Installation
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WARNING: DO NOT DISCONNECT THE PIPE FITTINGS ON THE UNIT AS THIS WILL
DAMAGE THE ULTRASONICS!!
THE METRAFLOW HAS A FIXED SINGLE UNBROKEN TUBE WHICH IS HELD IN PLACE
WITHIN THE HOUSING
CONNECTION TO THE FLOWMETER IS TO BE MADE ONLY VIA CUSTOMER FITTINGS
TO THE TUBE ENDS
Mounting and Orientation:
Mounting can be done using two M3 threaded ports on the rear of the flow meter
Position the meter either in a horizontal pipe or if in a vertical pipe with the flow in an upward direction.
This will ensure that any bubbles automatically clear the meter.
In a horizontal pipe confirm that the system has no air trapped in it. If vertical is not possible, an angle
of more than 10 degrees from the horizontal may be acceptable.
Due to Titan’s ultrasound algorithms used, straight upstream and downstream pipes are not necessary.
It is however, good practice to install the device well away from valves, regulators elbows and other
components that could cause random turbulence or gas break-out on the fluid entering or leaving the

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meter. As a guide, 10 pipe diameters upstream and 5 pipe diameters downstream are recommended.
If necessary use spacer blocks and mounting clips to raise the pipe work away from surfaces. It is good
practice to use upstream and downstream isolating full bore ball valves to facilitate easy meter
installation or removal.
The Metraflow must be installed in a positive pressure system. Ensure that there is enough back
pressure on the flowmeter to keep any gas in solution. We recommend 500mbar plus two times the
fluid vapour pressure.
The Metraflow can be operated entirely from a computer using the USB connection. This gives local
computer display and an NPN pulse output only. This may not be acceptable in situations where remote
operation or further functions are required. The unit will work with systems from Windows XP onwards.
Connect to the computer with the supplied 1.0m cable or any suitable USB lead. Do not exceed 5
Meters as this may cause data loss. Run the 1 Meter multicore output cable to a suitable terminal box
or instrument. This cable can be lengthened if required, up to 20m.
The cable assignments are displayed below:
Wire Colour (“PIN”)
Assignment
System
Brown
+10 to 24VDC (>15V for analog outputs)
Power
Blue
0V
Ground
Yellow (PIN6)
NPN Transistor
Input/Output
White (PIN7)
PNP Transistor
Input/Output
Black (PIN8)
NPN Transistor
Input/Output
Red
4-20mA
Analog output (mA)
Orange
0-5 or 0-10 Vdc
Analog output (V)
Green
Analog Common Ground
Analog ground

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Before use, download and install Titan Interface Software from memory stick or website.
The Metraflow ultrasonic flowmeter should be setup using the USB interface and a suitable computer.
Below is a screen shot of the Configuration screen as it typically opens with the flowmeter connected.
When connected the software should automatically load the settings the meter has been configured.
This can be checked by clicking the Check Settings Icon:
The four tabs at the bottom of the display operate windows for configuration and are: “User Settings”,
“Data Logging” “Flow Details” and “Advanced”.
Setup
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Major Functions of the flowmeter are governed by the Control buttons to the left of the interface window:
Send settings to system
Retrieve settings from meter
Open settings file on the computer
Save settings to a file on the computer
Test outputs
Unlock/Lock user settings
Diagnostic tools
Software information
The Software information panel has details including the
flowmeter serial number and software versions currently
running on the meter.
To modify the configuration click “User Settings” tab at the bottom of the screen and ensure the system
is unlocked for editing .
When modifications are completed press the Send Settings to Meter Icon, before closing the
Interface software to ensure the changes are written into the meters PCB.

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Screen shot of the “User Settings screen:
Multiple Window Operation:
To aid set up whilst operating the meter it is possible to detach the Flow Details and Advanced windows
by dragging and dropping the bottom tabs away from the main window. This allows the user to view
those tabs whilst adjusting the User Settings.
The Flow Details window may be further reduced or expanded using the minimise and maximise icons
respectively in the top right hand of the window

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User Settings Tab:
Calibration Settings
This section specifies the units you wish the meter to operate in.
Units: A drop down menu offers the choice of - Litres, cc, gms, kg,
US gallon, Imperial gallon or Custom units i.e. blank.
Rate (units per): This is the time base for the flow rate and has the
option of Second, Minute or Hour.
Scale Factor Adjustment: This is a fine tune adjustment on the
signal to compensate for errors introduced by erratic flow or other
system irregularities
Density: The flowmeter is fundamentally a volumetric device but a
density figure can be entered here if one of the mass units are
selected. Caution must be used however as there is no
temperature/density correction.
Cut Off: Flow values below this level will be set to zero.

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Display Appearance:
The down arrows select the various display functions:
Decrease Total for -ve flow: The meter will not register negative
flow unless this box is checked.
For reverse flow the rate will show a “-“ sign before the rate and
the total will be reduced accordingly. One of the transistor outputs
(PNP or NPN on Pin 6, 7 or 8) could be configured to give a logic
level when reverse flow is detected.
Pulses are only output on reverse flow, when this box is selected.
Display Mode: The down arrow selects from the various display
and Metraflow functions.
The options are:
Rate –The display will show flow rate only.
Total –The display will show total flow only.
Both –The display can be cycled from rate to total using the
left hand button on the Meter or the left button in the Flow
Details window on the Interface. A remote input can be
configured to perform this function (See: Pin Assignments).
Rate DP Position:Use the drop down menu to choose the required
decimal point position.
Total DP Position: Use the drop down menu to choose the
required decimal point position.
If the decimal point is set too low and the display value exceeds
the setting capacity the display will show “oF”

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Viewing Filter: This prevents the display, flow switches and analog
outputs from jittering with irregularities in the flow from, for
example, a peristaltic pump. The increments are arbitrary with the
degree of damping approximately doubling with each level.
Increments go up to 5, which may take up to a minute to stabilise.
External Connections
In this section you can configure what functions you wish the output cables/pins to perform.

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Pin Assignments:
Each of the PIN Assignments can be adjusted as either an input
or an output function. The operation to modify PIN 6, PIN 7 and
PIN 8 are identical within the software, with the exception of the
type of transistor pulse output. PIN 6 and PIN 8 are both NPN,
whilst PIN 7 is a PNP type.
The options for each PIN (or wire colour), are:  Not Used  Input or  Output
Not used: The assigned PIN / WIRE is unused.
Input: Select this to use the PIN assigned as a TTL digital input for remote control, either for Resetting
the Total Count or Resetting an Alarm.
When using electrical inputs for PIN 6 Yellow and PIN 8 Black, in input mode, the NPN (NFET) open
drain output is disabled, and the input pin responds to an external input voltage which may be in the
range of 0V to 30V. The logic threshold is at 2V so this input can be driven directly from a logic signal
at TTL levels or CMOS at 3.3V or 5.0V levels. Alternatively, if this input is provided by a switch, then an
example circuit is given below:
PIN 7: In input mode, the PNP (PFET) open drain output is disabled and the input PIN responds to an
external input voltage which may be in the range of 0V to 30V. The logic threshold is at 2V so this input
can be driven directly from a logic signal at TTL levels or CMOS at 3.3V or 5.0V levels.
Warning: because of the potential for conflict should the PNP output be activated accidentally, Titan
Enterprises Ltd recommend a series resistor and Zener be fitted to safeguard any connected circuitry
operating at logic levels. Alternatively, if this input is provided by a switch, then an example circuit is
given below:

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WARNING:
INCORRECT ELECTRICAL INSTALLATION CAN CAUSE DAMAGE TO USERS’ELECTRONICS
Output: Select this to use the PIN/Wire colour assigned as a
PULSE; FLOW ALARM (SINGLE OR DUAL) or REVERSE FLOW
output signal.
PULSE: The Metraflow has two options for Pulse output
configuration depending on which PIN/Wire colour is chosen:
PIN 6 Yellow and PIN 8 Black are both NPN pulse outputs;
PIN 7 White is a PNP.

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Example wiring for pulse output:
PULSE per: Enter the number of pulses per unit volume required. This figure can be adjusted to suit
the application and the flow range required from the meter.
The maximum output frequency is 10 kHz. So care must be taken to ensure that this pulse rate is not
exceeded.
E.g. 5 L/Min at 10 Kilohertz equals (10,000 x 60)/5 = 120,000.Therefore 120,000 pulses per litre is the
maximum resolution for 5 litres per minute assuming maximum frequency output. If the meter is being
used up to 1 L/Min the pulse output and so resolution could be increased to five times this, 600,000P/L.
It is possible to send a test signal at varying Hz for each of the pulse output PIN/Wires. Clicking
opens a menu where you can choose a rate of Hz of pulse outputs which will be automatically sent for
approximately 30 seconds.
NOTE: ABOVE 1KHZ IT IS RECOMMENDED THAT THE SYSTEM WIRING IS REVIEWED TO
ENSURE IT IS ADEQUATE FOR THE SAMPLING RATE.
Flow alarm outputs
Single flow alarm: Checking this option opens up input boxes for
THRESHOLD; LATCHING and INVERT.
Set the Threshold to the flow value you require the transistor to operate.
The logic of operation can be adjusted with the Invert check box (see
left).

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The Latching box gives the user three options of None, High Threshold
and Low Threshold.
“None” will cause the alarm to be triggered when the threshold flow
is met. The alarm state will then reset in accordance with the user
set Hysteresis*.
“High Threshold” will cause an alarm signal to Latch on when flow
is seen above the set value.
“Low Threshold” will cause an alarm signal to Latch on when flow is
seen below the set value.
* Hysteresis (%): This is used when Latching is set to NONE to prevent “fluttering” of the alarm signal
when flow is around the threshold level.
LATCHED alarms will remain active and the local display will show “LATCH” until they are reset. RESET
LATCH ALARMS by either a signal input on one of the other Input/Output PINS, or by pressing and
holding the left hand button on the local display on the flow meter for 3 seconds.
Note the alarm points are driven by the display value on the “flow reading” screen. Any changes to the
filter value of the display will affect the response time of the alarm points so there are two adjustable
parameters to ensure “fluttering” does not happen with small flow fluctuations - response time and
hysteresis.
INVERT –This check box allows the user to invert the operation of the signal.
Invert: Checked –Alarm output logic HIGH.
For details see the Alarm logic table or hover mouse over the set point to see the action of the output
with the chosen settings.
Dual flow alarm: Checking this will enable a range of flow to be entered.
When the flow is outside/inside of this range the alarm will be triggered.
The remaining settings in the input box are the same as for single flow
alarms.
When no Latching is chosen the alarm will automatically reset in proportion to the user
set Hysteresis.
The Latched Alarm can be reset by a signal input on one of the other Input/Output
PINS, or by pressing and holding the left hand button on the local display on the flow
meter for 3 seconds.

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The Invert checkbox will reverse the action of the alarm output. (See the Alarm Logic
Table).
Reverse flow alarm:
This option allows the user to send a signal from the assigned wire/PIN
when reverse flow is seen.
Selecting Invert will reverse the action of the signal.
Alarm Logic Table
Analog Output
There are four options on the drop down menu: Not Used, 4-20mA, 0-5 Volt and 0-10 Volt.
When an analogue output is assigned the appropriate wire will then be activated:
4-20mA –Pink Wire
0-5Vdc –Red
0-10Vdc –Red
4-20mA = RED wire 0-5V = ORANGE wire

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Once the selection has been made a further two boxes for entry of the analogue output at zero flow
and full scale appear. These are numeric entries in the units and time base as selected in Calibration
Settings.
It is possible to send a test signal to the outputs of the meter using the Test Outputs Icon on the
left hand side of the main screen. Clicking opens a menu where you can choose a % analogue output
value which will be automatically sent for approximately 30 seconds.
Flow Details Tab
The large display reflects the meter readings showing on the Metraflow LCD Display.
The RESULT DETAILS window below the large rate and total display shows the flow and total
readings and the assignment of PIN6, 7 & 8 (yellow, white, black wires), whilst the meter is
operational.

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Advanced User Tab
Interface Management:
This allows the operator to restrict access to the configuration of each meter.
Protect (with PIN) Advanced Features Only: Allows users to restrict access to advanced pages.
Protect (with PIN) all controls: Allows users to restrict all configuration modifications to the system.
To use these features it is first necessary to create a PIN. This is a four digit number in the range
0001 to 9999. Setting a value of 0000 tells the software there is no PIN and this is how to remove the
PIN. After allocating a PIN these check boxes can lock all of the settings or just the advanced user.
If you forget your PIN please contact you supplier for the default value. Once entered, all the setting
parameters remain visible. In the ‘Help’ menu, the user can ‘Log On using PIN...’ but the user will be
prompted for the PIN prior to making any changes.
Zero Null Feature
There will always be a small amount of “background noise” due to ultrasound remaining within the tube
between successive pings. This should be zeroed for best accuracy.
The noise affects low end performance and accuracy across the whole temperature range. The meter
is calibrated at ambient temperature, typically 21 to 25°C. To zero the background noise, fill the meter
with fluid under pressure at the desired metering temperature and use the Zero Null Feature:

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Capture Null:
This feature can be operated from the Titan
Interface Software or using the Local Meter
Display.
Stop the flow and operate the Capture Null
button in the Advanced Tab of the User
Interface Software or press both buttons on the
top of the meter simultaneously for 5 seconds.
The local display will change to a cycling “zero”
“null” while the measurements are being taken
and the Zero Null feature box in the software
will change to state “Nulling”.