Proudly engineered in Switzerland

Flow sensor FLT-M1

The FLT-M1 flow sensor has been designed to determine the mass flow of liquids and gases. This is done with a mini Coriolis measuring system with an S-shaped measuring tube and a temperature sensor.

The flow sensor is installed directly in a flow pipe via a manufacturer-specific connection. If medium flows through the flow sensor, the measured value information is generated with the aid of Coriolis forces. The measured values are fed to the higher-level system via a Modbus TTL.

It is possible to take flow measurements for pressure lines up to 100 bar at a measuring rate of 200 Hz (200 measured values per second). Flow changes are recorded with a step response time of 50 ms.

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Target audience

This product is designed for OEM applications in the field of plant and machine construction, where measuring instruments with high quantities and smallest variance are required. The device has no intrinsic safety, as the flow sensor is designed for integration into a device or system.

Applications

Dosing of delicate or expensive liquids

Measuring:

Dosing of delicate liquids consisting of several components. The flow components have been developed specifically for plant engineers. Highest precision with integrated electronics in combination with a very compact design.

Customer benefit:

  • Quality improvement: High-precision monitoring/dosing of the components
  • Optimizing the use of resources
FLT-Mx Dosierung mit Durchflussmessgeraet

​1. System for dosing and mixing of delicate and expensive liquid media. 2. Coriolis for monitoring the mass flow. In combination with a pump or a valve, a control circuit can be set up for optimal dosing. 3. Filling of media into suitable transport containers.

Specifications

General
Measured values:

  • Mass flow
  • Density
  • Temperature

Units of measurement:
Adjustable

Performance

Max. measurement error: FLT-M1_i1

  • Mass flow: ±0.10% FM
  • Zero-point stability of mass flow: ±0.0007 kg/h
  • Max. deviation of mass flow: ±0.10% or ±  0.0007 kg/h
  • Density: ±5 kg/m³
  • Temperature: ±1.0 K

Repeatability: FLT-M1_i1

  • Mass flow: ±0.05% FM
  • Zero-point stability of mass flow: ±0.00035 kg/h
  • Max. deviation of mass flow: ±0.05% or ±  0.00035 kg/h
  • Density: ±2.5 kg/m³
  • Temperature: ±0.5 K

Max. measurement error: FLT-M1_i2

  • Mass flow: ±0.10% FM
  • Zero-point stability of mass flow: ±0.0057 kg/h
  • Max. deviation of mass flow: ±0.10% or ±  0.0057 kg/h
  • Density: ±5 kg/m³
  • Temperature: ±1.0 K

Repeatability: FLT-M1_i2

  • Mass flow: ±0.05% FM
  • Zero-point stability of mass flow: ±0.00285 kg/h
  • Max. deviation of mass flow: ±0.05% or ±  0.00285 kg/h
  • Density: ±2.5 kg/m³
  • Temperature: ±0.5 K
Temperature conditions
Permissible medium temperature:

-10…+70 °C

Permissible ambient temperature:

-10…+80 °C

Permissible storage temperature:

-20…+85 °C

Range of application

Recommended flow measuring range: FLT-M1_i1

0…30 kg/h Pressure loss as a function of flow rate

Permissible medium pressure: FLT-M1_i1

Max. 100 bar (rel.)

Inlet and outlet sections: FLT-M1_i1

Inlet and outlet distances have no influence on the measuring accuracy.

Recommended flow measuring range: FLT-M1_i2

0…120 kg/h Pressure loss as a function of flow rate

Permissible medium pressure: FLT-M1_i2

Max. 100 bar (rel.)

Inlet and outlet sections: FLT-M1_i2

Inlet and outlet distances have no influence on the measuring accuracy.

Ambient conditions
Climate class:

Not specified

Electromagnetic compatibility:

Prepared for EMC 2014/30/EU (EN 61326-1)

Vibration and shock resistance:

Prepared for the following standards:

  • IEC/EN 60068-2-6
  • IEC/EN 60068-2-27
  • IEC/EN 60068-2-31
  • IEC/EN 60068-2-64

Degree of protection:

Housing is hermetically sealed, IP protection only when installed.

Dimensions

Dimensions: FLT-M1_i1

100 x 30 x 104 mm³

Weight: FLT-M1_i1

850 g

Inner diameter of measuring tube: FLT-M1_i1

1.1 mm

Dimensions: FLT-M1_i2

135 x 36,5 x 145 mm³

Weight: FLT-M1_i2

2150 g

Inner diameter of measuring tube: FLT-M1_i2

2.5 mm

Materials

Housing:

Stainless steel, 1.4301 (304L)

Wetted parts:

Stainless steel, 1.4404/1.4435 (316L)

Option wetted parts for FLT-M1_i1:

Alloy C22, 2.4602

Fluidic interfaces
Fluidic interfaces:

Manufacturer-specific connection.

Electrical interfaces

Connection:

Solder pins with 1 mm diameter, 7-pole

Communication:

  • Modbus TTL

Power supply:

DC 10…35 V (max. 1 Watt). No galvanic isolation

Connection pin assignment:

FLT_M1_i1_Pin-Belegung

 

 

 

 

Pin Assignment Modbus TTL
1 V+ Supply voltage
2 SDA Modbus Tx
3 SCL Modbus Rx
4 NC Modbus T/R
5 CDI-Rx Serial transmission (service interface)
6 CDI-Tx Serial reception (service interface)
7 GND Reference potential for all circuits
Certificates and approvals
CE mark:

The flow sensor is intended to act as an electronic component for integration into a device or system. The flow sensor is not a stand-alone measuring device and therefore does not require the CE mark to be affixed.

RoHS:

All installed components meet the requirements of the RoHS Directive.

Zero point adjustment
A zeropoint adjust in the application is based on factory calibration and due to excellent zeropoint stability not required in general. However under certain circumstances a zeropoint adjust can be recommended:

  • When highest accuracy is needed at low flow rates.
  • When process conditions are extreme, e.g. very high process temperature.

For a zeropoint adjust the following pre-conditions need to be fulfilled:

  • Measuring line is completely shut off, i.e. real flow is truly zero!
  • Measuring tube is filled homogeneously and pressurized with at least 15 psi (gauge) to avoid gas bubbles in the fluid, when measuring gas no condensation is allowed.

During the zeropoint adjust stability of measured flow rate is monitored and its mean value is built for new zeropoint value. This typ. takes 20 s. If the process conditions are not suitable zeropoint adjust is aborted and old zeropoint value remains valid

Flow damping
With this time constant (PT1 system) mass flow value can be dampened. Factory default is 0 s (no dampening). This dampening increases system reaction (step response time) time on the other hand. Especially for flow control application this should be considered. E.g. a time constant of 0.1 s leads to an increase of step response time from 50 ms to 550 ms.
Low Flow Cutoff
With this function mass flow value is cut off to zero, when threshold is underrun.

So it’s ensured that totalizer is stopped properly and cannot creep away.

Low flow cutoff is left when mass flow overruns 150% of set threshold (hysteresis).

When low flow cutoff is active no status message is set.

Empty Pipe Detection
With this function an empty or partly filled measuring tube is detected. When density undenruns set threshold mass flow is set to zero and a status message is set correspondingly.