High Precision Flow Transmitter
Hygienic Flow Transmitter
Application
 The Alfa Laval Flow Transmitter is designed to fulfil the demands of hygienic and pharmaceutical production. Amongst others it is suitable for flow measurement in Food, Beverage, Dairy and Biopharm industries
Main features:
- Suitable for Hygienic applications 3A approved.
- No internal pressure drop.
- Robust and compact design - easy to mount, even in difficult applications.
- Constructed to be independent of variations in flow profile.
- Optimized for high accuracy and linearity.
- Pre set-up from factory, ready for installation.
- Bidirectional, (can measure in both flow directions).
- No moving parts - no maintenance.
Standard range
The Alfa Laval Flow Transmitter is an electromagnetic precision meter for volumetric measurement of liquids that are electrically conductive. The transmitter can be used in applications where a hygienic design is required and the rugged construction of the transmitter makes it suitable for installations where solid particles are present in the liquid. The standard version is delivered pre-setup making installation quick and easy. The output signal is as standard a pulse-signal (0 to 1000 Hz) with a resultion of either 0,01 or 0,1 ltr/pulse. As an option the Flow transmitter can be delivered with analogue 4-20 mA output or with a display enabling advanced features.
The metering tube is coated with Teflon (FEP) on the inside and is fitted with clamp connections. The sensitive electronic is completely embedded and consequently hermetically sealed. The flow transmitter is water proof with protection class IP 67. The terminals for electrical connection are marked with both number and function and cable access is done through 3 PG-11 cable glands.
Working principle
The Alfa Laval Flow Transmitter consists of a metering pipe and two magnetic coils. When a current is applied to the coils a magnetic field is produced at right angles to the metering pipe.
With a conductive liquid flowing through the metering pipe an electrical voltage is induced and measured by two electrodes mounted in the metering pipe. This voltage is proportional to the average velocity of flow and therefore to the volume flowing.
The Alfa Laval Flow Transmitter utilizes a square measurement chamber. The shape of the measurement chamber significantly reduces the influence of viscosity, type of liquid, and flow profiles and eliminates any need for recalibration when changing product for instance from milk to water.
The microprocessor in the transmitter controls the current generator keeping the magnetic field constant. The voltage across the electrodes is amplified and converted to a digital value from which the microprocessor calculates the liquid flow
Technical data
Measuring ranges:
0 to 8 m3/h (connection:DN25 (ISO2852))
0 to 20 m3/h (connection:DN38 (ISO2852))
0 to 40 m3/h (connection:DN51 (ISO2852))
0 to 80 m3/h (connection:DN63 (ISO2852))
0 to 120 m3/h (connection:DN76 (ISO2852))
0 to 200 m3/h (connection:DN102 (ISO2852))
Resolution output signal:
TE67A1XXXXXXXX: 0.01 litre/pulse
TE67A2XXXXXXXX: 0.01 litre/pulse
TE67A3XXXXXXXX: 0.10 litre/pulse
TE67A4XXXXXXXX: 0.10 litre/pulse
TE67A5XXXXXXXX: 0.10 litre/pulse
TE67A6XXXXXXXX: 0.10 litre/pulse
Accuracy: between 0.02% of FS and 1% of FS, see below graph
Repeatability accuracy: . . . . . . . . . . .Max 0.5 * accuracy
Media conductivity: . . . . . . . . . . . . . .Min 5 μS/cm
Mechanical data
Process connections:
TE67A1XXXXXXXX: connection: clamp DN25 (ISO2852)
TE67A2XXXXXXXX: connection: clamp DN38(ISO2852)
TE67A3XXXXXXXX: connection: clamp DN51(ISO2852)
TE67A4XXXXXXXX: connection: clamp DN63(ISO2852)
TE67A5XXXXXXXX: connection: clamp DN76(ISO2852)
TE67A6XXXXXXXX: connection: clamp DN102(ISO2852)
Materials
Wetted parts: . . . . . . . . . . . . . . . . .AISI 316 and Teflon
Housing: . . . . . . . . . . . . . . . . . . . . .Noryl
Operating temperature
Wetted parts: . . . . . . . . . . . . . . . . .-30 to 100 degr. Celsius
Electronics range . . . . . . . . . . . . . . .-10 to 50 degr. Celsius
Protection class: . . . . . . . . . . . . . . .IP67
Max media pressure: . . . . . . . . . . . . .10 bar
Weight
Flow transmitter: . . . . . . . . . . . . . . .5 kg. (type TE67A6: 10 kg. )
Electrical data
The Alfa Laval Flow Transmitter is pre-setup from factory ready for installation and has as standard integrated automatic zero point adjustment
As an option The Alfa Laval Flow Transmitter can be delivered with display giving access to advanced features such as integrated temperature compensation through external pt100 sensor, PI regulator and for low flows a linearization function further optimizing the accuracy at low flows.
Power supply: . . . . . . . . . . . . . . . . .24 V AC/DC (0.25A)
Output
Pulse output: . . . . . . . . . . . . . . . . . .(0 to 1000Hz)
4-20 mA (option)
Response time
Pulse output: . . . . . . . . . . . . . . . . . .0.2 sec.
4-20mA: . . . . . . . . . . . . . . . . . . . .1 sec.
Connection: . . . . . . . . . . . . . . . . . .Pg11 cable gland
Certificates
- Calibration certificate is as standard delivered with every unit
- 3.1.B certificate (option)
- 3A certificate (option)
- CEmarked
Electrical layout diagram of connection box
Selection guide
When selecting a Flow Transmitter two follow rules should be followed:
1. The Flow Transmitter with a pipe dimension equal to the rest of the piping system should be selected.
2. If optimum measurement accuracy is of primary concern, the smallest possible transmitter should be chosen, while still observing that the maximum flow rate must never be exceeded.
The below table can assist in selection.
 Note: 1. Reduced accuracy 2. Linearization function enabled 3. Best accuracy 4. Out of range, flow meter will be damaged
Accuracy: between 0.02% of FS and 1% of FS, see below graph
Selection example:
Problem: The flow to be measured is between 4 and 12 m/h and the piping installation is 38 mm (1")
Solution: according to the selection guide model TE67A2xxxxxxxx and TE67A3xxxxxxxx can be used, both selections will give optimum accuracy.
But following rule number TE67A2xxxxxxxx is selected as it has the same piping diameter as the installation and thereby minimizes pressure loss in the system.
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