Endress+Hauser Micropilot M FMR 230 Handbuch

Technical Information

TI 345F/00/en Level-Radar

micropilot M

FMR 230/231/240

Smart Transmitter for continuous and

non-contact level measurement

Cost-effective 4…20 mA 2-wire technology

Suitable for hazardous locations

Features and benefits

•2-wire technology, low price:

A real alternative to differential

pressure, floats and displacers.

2-wire technology reduces wiring costs

and allows easy implementation into

existing systems.

•Non-contact measurement:

Measurement is almost independent

from product properties.

•Easy on-site operation via menu-driven

alphanumeric display.

•Easy commissioning, documentation

and diagnostics via operating software

(ToF Tool).

•2 frequency ranges – approx. 6 and

26 GHz:

No compromises, the right frequency

for every application.

•HART or PROFIBUS-PA respectively

Foundation Fieldbus protocol.

•High temperatures:

Suitablefor process temperatures up to

+200 °C (392 °F), up to 400 °C (752 °F)

with high-temperature antenna.

•Rod antenna with inactive length:

Reliable measurement in narrow

nozzles, with condensation and

build-up in the nozzle.

Application

The Micropilot M is used for continuous,

non-contact level measurement of

liquids, pastes, and slurries.

The measurement is not affected by

changing media, temperature changes,

gas blankets or vapours.

•The FMR 230 is especially suited for

measurement in buffer and process

tanks.

•The FMR 231 has its strengths

wherever high chemical compatibility is

required.

•The FMR 240 with the small (1½") horn

antenna is ideally suited for small

vessels. Additionally, it provides an

accuracy of ±3 mm.

FMR 231

FMR 230

FMR 240

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Micropilot M

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Function and system design

Measuring principle The Micropilot is a "downward-looking" measuring system, operating based on the time-of-flight

method. It measures the distance from the reference point (process connection) to the product

surface. Radar impulses are emitted by an antenna, reflected off the product surface and

received again by the radar system.

Input

The reflected radar impulses are received by the antenna and transmitted into the electronics.

A microprocessor evaluates the signal and identifies the level echo caused by the reflection of the

radar impulse at the product surface. The unambiguous signal identification is accomplished by

the PulseMaster software, based on many years of experience with time-of-flight technology.

The mm-accuracy of the Micropilot S could be achieved with the patented algorithms of the

PhaseMaster software.

The distance D to the product surface is proportional to the time of flight t of the impulse:

D = c · t/2,

with c being the speed of light.

Based on the known empty distance E, the level L is calculated:

L = E – D

Refer to the above figure for the reference point for "E".

The Micropilot is equipped with functions to suppress interference echoes. The user can activate

these functions. They ensure that interference echoes (i.e. from edges and weld seams) are not

interpreted as level echo.

Output

The Micropilot is commissioned by entering an empty distance E (=zero), a full distance F (=span)

and an application parameter. The application parameter automatically adapts the instrument to

the measuring conditions. The data points “E” and “F” correspond with 4mA and 20mA for

instruments with current output. They correspond with 0 % and 100 % for digital outputs and the

display module.

A linearization, based on a table entered either manually or semi-automatically, can be activated

locally or remotely. This function provides a measurement in engineering units and a linear output

signal for spheres, horizontal cylindrical tanks and vessels with conical outlet.

L00-FMR2xxxx-15-00-00-en-001

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Micropilot M

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Equipment architecture Stand-alone

The Micropilot M can be used for measurement in a stilling well / bypass as well as in free space.

The instrument provides a 4…20 mA output with HART protocol, or PROFIBUS-PA respectively

Foundation Fieldbus communication.

4…20 mA output with HART protocol.

The complete measuring system consists of:

On-site operation:

•with display and operating module VU 331,

•with a Personal Computer, FXA 193 and the operating software ToF Tool.

The ToF Tool is a graphical operating software for instruments from Endress+Hauser that

operate based on the time-of-flight principle (radar, ultrasonic, guided micro-impulse). It assists

with commissioning, securing data, signal analysis and documentation of the measuring point.

Remote operation:

•with HART handheld DXR 275,

•with a Personal Computer, Commubox FXA 191 and the operating software COMMUWIN II

respectively ToF Tool.

L00-FMR2xxxx-14-00-06-en-001

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Micropilot M

4Endress+Hauser

System integration via PROFIBUS-PA

A maximum of 32 transmitters (8 if mounted in an explosion hazardous location EEx ia IIC

according to FISCO-model) can be connected to the bus. The segment coupler provides the

operating voltage to the bus. Both on-site as well as remote operation are possible.

The complete measuring system consists of:

System integration via Foundation Fieldbus

A maximum of 32 transmitters (standard, EEx em or EEx d) can be connected to the bus. For

protection class EEx ia IIC: the max. number of transmitters depends on the established rules and

standards for intrinsically safe circuits (EN 60070-14), proof of intrinsically safety. Both on-site as

well as remote operation are possible. The complete measuring system consists of:

L00-FMR2xxxx-14-00-06-en-002

L00-FMR2xxxx-14-00-06-en-003

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Micropilot M

Endress+Hauser 5

System integration via Rackbus

Multiple transmitters Micropilot M (or other instruments) can be connected to a higher-level bus

system via a Gateway ZA:

•Every HART transmitter via one interface module FXN 672 each.

•Gateways are available for MODBUS, FIP, PROFIBUS, INTERBUS etc.

•Both on-site as well as remote operation are possible.

L00-FMR2xxxx-14-00-06-en-006

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Micropilot M

6Endress+Hauser

Input

Measured variable The measured variable is the distance between a reference point (refer to fig. on page 2) and a

reflective surface (i.e. medium surface).

The level is calculated based on the tank height entered.

The level can be converted into other units (volume, mass) by means of a linearization.

Measuring range The usable measuring range depends on the size of the antenna, the reflectivity of the medium,

the mounting location and eventual interference reflections.

The following tables describe the groups of media as well as the achievable measuring range as

a function of application and media group. If the dielectric constant of a medium is unknown, it is

recommended to assume media group B to ensure a reliable measurement.

1) Treat Ammonia NH3 as a medium of group A, i.e. always use a stilling well.

Measuring range depending on vessel type, conditions and product for Micropilot M

FMR 230 and FMR 231:

2) possible, i.e. with stilling well in bypass.

Product class DK (εr) Examples

A1.4 … 1.9 non-conducting liquids, e.g. liquefied gas 1)

B1.9 … 4 non-conducting liquids, e.g. benzene, oil, toluene, …

C4 … 10 e.g. concentrated acids, organic solvents, esters, aniline, alcohol,

acetone, …

D> 10 conducting liquids, e.g. aqueous solutions, dilute acids and alkalis

Product class Storage tank

(scarce

draining/filling)

Buffer tank

(continuous

draining / filling)

Tank with single stage

propeller agitator

Stilling well Bypass

Measuring range Measuring range Measuring range Measuring

range

Measuring

range

FMR 230: DN150

DN200/250

8" / 10"

DN150

DN200/250

8" / 10"

DN150

DN200/250

8" / 10"

DN80…250

3"…10"

DN80…150

3"…6"

FMR 231: Rod antenna — Rod antenna — Rod antenna — — —

ADK(εr)=1.4…1.9 to use the stilling well (20 m / 67 ft) 20 m/67 ft 2)

BDK(εr)=1.9…4 10 m/33 ft 15 m/50 ft 5 m/16 ft 7.5 m/24 ft 4 m/13 ft 6 m/20 ft 20 m/67 ft 2)

CDK(εr)=4…10 15 m/50 ft 20 m/67 ft 7.5 m/24 ft 10 m/33 ft 6 m/20 ft 8 m/27 ft 20 m/67 ft 20 m/67 ft

DDK(εr)>10 20 m/67 ft 20 m/67 ft 10 m/33 ft 12.5 m/42 ft 8 m/27 ft 10 m/33 ft 20 m/67 ft 20 m/67 ft

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Micropilot M

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Measuring range depending on vessel type, conditions, and product for Micropilot M

FMR 240:

Product class Storage tank

(scarce draining/filling)

Buffer tank

(continuous draining / filling)

Tank with single stage propeller

agitator

Measuring range Measuring range Measuring range

FMR 240: 1½"

40mm

DN50

DN80

DN100

1½"

40mm

DN50

DN80

DN100

1½"

40mm

DN50

DN80

DN100

ADK(εr)=1.4…1.9 to use the stilling well (20 m / 67 ft)

BDK(εr)=1.9…43 m /

10 ft

5 m /

16 ft

10 m /

33 ft

15 m /

50 ft

2 m /

7ft

2.5 m /

8ft

5 m /

16 ft

7.5 m /

25 ft

1 m /

3ft

1 m /

3ft

2 m /

7ft

3 m /

10 ft

CDK(εr)=4…10 6 m /

20 ft

10 m /

33 ft

15 m /

50 ft

20 m /

67 ft

3 m /

10 ft

5 m /

16 ft

7.5 m /

25 ft

10 m /

33 ft

1.5 m /

5ft

2 m /

7ft

3 m /

10 ft

5 m /

16 ft

DDK(εr)>10 9 m /

30 ft

15 m /

50 ft

20 m /

67 ft

20 m /

67 ft

5 m /

16 ft

7.5 m /

25 ft

10 m /

33 ft

12.5 m

/ 42 ft

2 m /

7ft

3 m /

10 ft

5 m /

16 ft

7 m /

23 ft

Product class Stilling well Bypass Wave Guide antenna

Measuring range Measuring range Measuring range

FMR 240: 1½" / 40mm …DN100

1½"…4"

DN50…100

2"…4" Wave Guide antenna

ADK(εr)=1.4…1.9 20 m/ 67 ft see pipe antenna depending

on pipe length,

max. 2.8 m (9.2 ft)

BDK(εr)=1.9…4 20 m/ 67 ft

CDK(εr)=4…10 20 m/ 67 ft 20 m/ 67 ft

DDK(εr)>10 20 m/ 67 ft 20 m/ 67 ft

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Micropilot M

8Endress+Hauser

Measuring conditions Note!

Please use FMR 230 respectively FMR 231 for boiling surfaces or in case of a tendency for

foaming.

The maximum measuring range of the FMR240 may decrease in case of heavy steam

development, depending on density, temperature and composition of the steam (-> please

use FMR 230 respectively FMR 231). Please use FMR 230 in stilling well for the

measurement of ammonia NH3.

•The measuring range begins, where the beam hits the tank bottom. Particularly with dish

bottoms or conical outlets the level cannot be detected below this point.

•In case of media with a low dielectric constant (groups A and B), the tank bottom can be visible

through the medium at low levels. In order to guarantee the required accuracy in these cases,

it is recommended to position the zero-point at a distance (C) above the tank bottom

•In principle it is possible to measure up to the tip of the antenna. However, due to considerations

regarding corrosion and build-up, the end of the measuring range should not be chosen any

closer than 50 mm (2”) to the tip of the antenna.

•The smallest possible measuring range (B) depends on the antenna version.

•The tank diameter should be greater than (D), the tank height at least (H).

•Depending on its consistence, foam can either absorb microwaves or reflect them off the foam

surface. Measurement is possible under certain conditions.

B [m / inch] C [mm / inch] D [m / inch] H [m / ft]

FMR 230 / 231 > 0.5 / > 20 150…300 / 6…12 > 1 / > 40 > 1.5 / > 5

FMR 240 > 0.2 / > 8 50…150 / 2…6 > 0.2 / > 8 > 0.3 / > 1

L00-FMR2xxxx-17-00-00-en-005

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Micropilot M

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Output

Output signal •4…20 mA with HART protocol

•PROFIBUS-PA

•Foundation Fieldbus (FF)

Signal on alarm Error information can be accessed via the following interfaces:

•Local display:

–Error symbol (see page 27)

–Plain text display

•Current output

•Digital interface

Auxiliary energy

Electrical connection Terminal compartment

Two housings are available:

•Housing F 12 with additionally sealed terminal compartment for standard or EEx ia

•Housing T 12 with separate terminal compartment for standard, EEx e or EEx d.

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Micropilot M

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Terminal assignment 4…20 mA with HART

The 2-wire cable is connected to the screw

terminals (wire diameter 0.5…2.5mm) in the

terminal compartment.

Use 2-wire twisted pair cable with screen for

the connection.

Protective circuitry against reverse polarity,

RFI, and over-voltage peaks is built into the

device (refer to TI 241F »basics for EMC-

tests«).

Terminal assignment PROFIBUS-PA

The digital communication signal is transmitted

to the bus via a 2-wire connection. The bus also

provides the auxiliary energy.

Please use 2-wire twisted pair cable with

screen.

Hints regarding architecture and grounding of

the network can be found in BA 198F

»projecting hints PROFIBUS-PA«and the

specification for PROFIBUS-PA.

Terminal assignment Foundation Fieldbus

The digital communication signal is transmitted

to the bus via a 2-wire connection. The bus

also provides the auxiliary energy.

Please use 2-wire twisted pair cable with

screen. Further cable specifications can be

found in the FF specification or the

IEC 61158-2.

Further hints regarding architecture and

grounding of the network can be found at the

Internet address »http://www.fieldbus.org«.

L00-FMR2xxxx-04-00-00-en-002L00-FMR2xxxx-04-00-00-en-003L00-FMR2xxxx-04-00-00-en-007

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