Electromagnetic flow meters

Electromagnetic flow meters with „D“ flowtube – DIN 11851 thread

The flow meters with D (DIN 11851) flowtubes. This category includes electromagnetic flow meters designed especially for food, dairy and beverage industry. Due to the requirements for easy and fast assembly / disassembly during pipe cleaning, these sensors are equipped with the aseptic DIN 11851 process connection.

The sensor covers are made from a stainless steel SS304 or SS316L, to meet hygienic requirements and requirements to operate in aggressive and humid environments. For operations with particularly aggressive influences (high relative humidity, acidic or alkaline environment, high / low temperatures, …). These sensors can be delivered in a separate design – the transducer (flowmeter display unit) is connected to the sensor with a shielded cable up to 40 m long, then it may be located outside of these areas. Separate sensor design can optionally be made with IP68 protection.

These “D” flowtubes are only made with Teflon liner, and with a choice from several sensing electrode materials (316L stainless steel, Hastelloy C, titanium, tantalum,…).

These sensors are commonly used to measure the flow of drinking water, wine products, fruit juices, milk, whey, beer and other. It also resists cleaning lyes and acids that are used daily in these industries. The PTFE liner and the flowmeter itself meet hygienic requirements according to Act No. 258/200 Coll. and Decree of Ministry of Health No. 409/2005 Coll. to products coming into constant contact with drinking and hot water. The PTFE liner and SS316L electrodes complies with the EU regulation EC No 1935/2004.

Standardly, these sensors are equipped with SS316L stainless steel electrodes, suitable for measuring common water-based liquids. Especially for the measurement of dairy products the Hastelloy C22 electrodes are recommended. For very aggressive chemicals, Tantal or Titan electrodes are used. The suitability of using a particular electrode material depends on the temperature, chemical composition and concentration of the measured liquid.

The basic dimensions and lengths of the sensors are based on ISO standards (see table below). However, customer designs with special construction lengths can also be supplied.

FG4000 flow meter specification:

Display:YES (2x16 chars)NO
Measuring range:1 :40 ( ±0,5% for MPE standard); 1:500 (Q0=0,2% Qmax)
Accuracy:± 0.5 % (± 0.003 m/s) in range from Qmin do Qmax
Minimum liquid conductivity:>5ųS/cm – common liquids; ≥20ųS/cm – demineralized water
Power supply:230 VAC (+10;−15%) 50–60Hz; optionally 120VAC, 24VAC, 24VDC
Power demand:10 VA
IEC 536 protection class:I
Ingress protection rating:IP67
Meter finish:powder paint (RAL 8023)
Ambient temperature rangé:0–70°C; recommended 15–55°C
Pulse output 1:in range 0.0001–1600 p/dm3 (maximum value depends on flowtube inner diameter)
Pulse output 2:state – signalization of the negative flow; pulse – negative volume (bidirectional flow)
Pulse inputs:2× range (0.0001–1000 p/dm3) to display flow and/or volume measured by external
Empty pipeline indication:yes (optional)
Communication modules:RS485, RS422, RS232, M-Bus, ... (optional)
Communication protocols:SIMPLE, ModBUS, BitBUS, ASCII , MBUS
Analogue outputs:4-20 mA, 0-10 V (optional)
Archive:hourly, daily, monthly, errors,.. (optional)

DIN 11851 flowtube specification:

DN – Thread dimension:DN10 - DN80
Liner:PTFE (teflon)
Electrodes:Stainless steel SS316L (1.4571); hastelloy C; platina; tantal; titan
Nominal pressure:PN16
Flowtube design:Compact; separate – 4m cable (optionally ut to 40m)
Flowtube finish:SS304; SS316L (polished stainless steel)
Ingress protection rating:IP67 (optionally IP68)
Temperature of the measured liquid:0-150 °C (PTFE)

Table of included inner diameters for DIN 11851 sensors:

FG 4000DIN 11851 flowtubes „D“ (PTFE liner)
DN - threading [mm]1520253240506580
Sensor measuring profile [mm]1015202532405065
Q0 (m3/h)0,010,020,030,040,070,110,170,29
Q1 (m3/h)0,080,190,340,530,871,362,123,58
Q3 (m3/h)3,397,6313,621,234,754,384,8143


DN – threading – Dimension of the thread (DN) according to DIN 11851
Sensor measuring profile – Flowtube nominal inner diameter
Q0 – Starting flow
Q1 – Minimal flow
Q3 – Maximal flow
k – Maximal pulse constant of flow conversion

Diameters and weight of DIN 11851 sensors:

DN - threadingInner diameterPNA∅Dm[kg]
252016150 (200)1056,5
322516150 (200)1126,5
403216150 (200)1127


DN – threading – Dimension of the thread according to DIN 11851
Inner diameter – Nominal inner diameter of the sensor
PN – Maximum allowable pressure
A – Length of the sensor
∅D – Outside diameter of the sensor cover
m – Sensor weight