Endress+Hauser FMX21 Specifications

TI00431P/00/EN/17.18 71397581

Products

Solutions Services

Technical Information

Waterpilot FMX21

Hydrostatic level measurement

Compact transmitter for level measurement

Application

The Waterpilot FMX21 is a pressure sensor for hydrostatic level measurement.

Endress+Hauser offers three different versions of the device:

• FMX21 with a stainless steel housing, external diameter of 22 mm (0.87 in): This version is excellently suited to drinking water applications and for use in bore holes and wells with small diameters

• FMX21 with a stainless steel housing, external diameter of 42 mm (1.65 in): Heavy-duty version and easy to clean thanks to flush-mounted process isolating diaphragm, ideally suited to wastewater and wastewater treatment plants

• FMX21 with plastic insulation, external diameter of 29 mm (1.14 in): Robust version for use in salt water and excellently suited to applications on ships (e.g. ballast water tanks)

Your benefits

• High resistance to overload

• High-precision, robust ceramic measuring cell with long-term stability

• Climate proofed sensor thanks to completely potted electronics and 2-filter pressure compensation system

• Simultaneous measurement of level and temperature with optionally integrated Pt100 temperature sensor

• Accuracy – Standard reference accuracy ±0.2 % – PLATINUM version ±0.1 %

• Automatic density compensation to increase accuracy

• Usage in drinking water: KTW, NSF, ACS

• Approvals: ATEX, FM, CSA

• Marine approvals: GL, ABS, BV, DNV

• Extensive range of accessories provides complete measuring point solutions

Waterpilot FMX21

About this document ........................ 4

Document function ............................ 4

Symbols used ................................ 4

Supplementary documentation .................... 5

Terms and abbreviations ........................ 6

Turn down calculation .......................... 7

Function and system design ................... 8

Device version ............................... 8

Measuring principle ............................ 9

Measuring system ............................ 10

Level measurement with absolute pressure probe and

external pressure signal for FMX21 4 to 20 mA HART .... 12

Density compensation with the Pt100 temperature sensor

for FMX21 4 to 20 mA HART .................... 12

Communication protocol ........................ 13

System integration ........................... 13

Input .................................... 14

Measured variable ............................ 14

Measuring range ............................. 14

Input signal ................................ 15

Output .................................. 16

Output signal ............................... 16

Signal range ................................ 16

Maximum load for FMX21 4 to 20 mA Analog ......... 16

Maximum load for FMX21 4 to 20 mA HART .......... 16

Damping for FMX21 4 to 20 mA HART .............. 17

Protocol-specific data for FMX21 4 to 20 mA HART ..... 18

Power supply ............................. 19

Supply voltage .............................. 19

Power consumption ........................... 19

Current consumption .......................... 19

Connecting the device ......................... 19

Terminals in the terminal box .................... 23

Probe cable ................................ 24

Cable resistance ............................. 24

Cable specifications ........................... 24

Residual ripple for FMX21 4 to 20 mA Analog ......... 24

Residual ripple for FMX21 4 to 20 mA HART .......... 24

Performance characteristics .................. 25

Reference operating conditions ................... 25

Reference accuracy ........................... 25

Resolution ................................. 25

Long-term stability ........................... 26

Influence of medium temperature ................. 26

Warm-up period ............................. 26

Response time .............................. 26

Installation ............................... 27

Installation instructions ........................ 27

Additional installation instructions ................. 27

Cable length ................................ 28

Technical data for cable ........................ 29

Cable marking .............................. 29

Cable shortening kit ........................... 30

Environment .............................. 31

Ambient temperature range ..................... 31

Storage temperature range ...................... 31

Degree of protection .......................... 31

Electromagnetic compatibility (EMC) ............... 32

Overvoltage protection ......................... 32

Process .................................. 33

Medium temperature range ...................... 33

Medium temperature limit ...................... 33

Pressure specifications ......................... 34

Mechanical construction .................... 35

Dimensions of the level probe .................... 35

Dimensions of the mounting clamp ................. 36

Dimensions of cable mounting screw ................ 36

Dimensions of terminal box IP66, IP67 with filter ....... 37

Dimensions of the TMT181 temperature head transmitter

for FMX21 4 to 20 mA Analog ................... 38

Dimensions of the TMT182 temperature head transmitter

for FMX21 4 to 20 mA HART .................... 38

Terminal box with integrated TMT181 temperature head

transmitter for FMX21 4 to 20 mA Analog ........... 39

Terminal box with integrated TMT182 temperature head

transmitter for FMX21 4 to 20 mA HART ............ 39

Additional weight ............................ 40

Testing adapter .............................. 40

RIA15 in the field housing ...................... 41

HART communication resistor .................... 41

Weight ................................... 42

Materials .................................. 43

Operability ............................... 46

FMX21 4 to 20 mA Analog ...................... 46

FMX21 4 to 20 mA HART ....................... 46

RIA15 .................................... 46

Certificates and approvals ................... 47

CE mark ................................... 47

RCM-Tick marking ............................ 47

Ex approvals ................................ 47

EAC conformity .............................. 47

Drinking water approval ........................ 47

Marine approval ............................. 47

Other standards and guidelines ................... 48

Calibration ................................. 48

Pressure Equipment Directive 2014/68/EU (PED) ....... 48

Calibration unit .............................. 48

Service ................................... 49

Downloading the Declaration of Conformity ........... 49

Ordering information ....................... 50

Scope of delivery ............................. 50

Configuration data sheet ........................ 50

2 Endress+Hauser

Waterpilot FMX21

Accessories ............................... 52

Service-specific accessories ...................... 53

Supplementary documentation ............... 54

Field of Activities ............................ 54

Technical Information ......................... 54

Operating Instructions ......................... 54

Brief Operating Instructions ..................... 54

Safety Instructions (XA) ........................ 54

Drinking water approval ........................ 54

Registered trademarks ...................... 54

GORE-TEXâ ................................ 54

TEFLONâ ................................. 54

HARTâ ................................... 54

FieldCareâ ................................. 55

DeviceCareâ ................................ 55

iTEMPâ .................................. 55

Endress+Hauser 3

About this document

DANGER

WARNING

CAUTION

NOTICE

Waterpilot FMX21

Document function

The document contains all the technical data on the device and provides an overview of the accessories and other products that can be ordered for the device.

Symbols used Safety symbols

Symbol Meaning

Electrical symbols

Symbol Meaning Symbol Meaning

DANGER!

This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in serious or fatal injury.

WARNING!

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in serious or fatal injury.

CAUTION!

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in minor or medium injury.

NOTE!

This symbol contains information on procedures and other facts which do not result in personal injury.

Direct current Alternating current

Direct current and alternating current Ground connection

Protective ground connection

A terminal which must be connected to ground prior to establishing any other connections.

Symbols for certain types of information

Symbol Meaning

Permitted

Procedures, processes or actions that are permitted.

Preferred

Procedures, processes or actions that are preferred.

Forbidden

Procedures, processes or actions that are forbidden.

Tip

Indicates additional information.

Reference to documentation

A grounded terminal which, as far as the operator is concerned, is grounded via a grounding system.

Equipotential connection

A connection that has to be connected to the plant grounding system: This may be a potential equalization line or a star grounding system depending on national or company codes of practice.

Reference to page

Reference to graphic

Visual inspection

4 Endress+Hauser

Waterpilot FMX21

,…,

Symbols in graphics

Symbol Meaning

1, 2, 3 ... Item numbers

Series of steps

A, B, C, ... Views

A-A, B-B, C-C, ... Sections

Supplementary documentation

The document types listed are available: In the Download Area of the Endress+Hauser Internet site: www.endress.com → Download

Brief Operating Instructions (KA): getting the 1st measured value quickly

FMX21 4 to 20 mA Analog - KA01244P:

FMX21 4 to 20 mA HART - KA01189P:

The Brief Operating Instructions contain all the essential information from incoming acceptance to initial commissioning.

Operating Instructions (BA): your comprehensive reference

FMX21 4 to 20 mA Analog - BA01605P:

FMX21 4 to 20 mA HART - BA00380P:

RIA15 - BA01170K:

These Operating Instructions contain all the information that is required in various phases of the life cycle of the device: from product identification, incoming acceptance and storage, to mounting, connection, operation and commissioning through to troubleshooting, maintenance and disposal.

Safety Instructions (XA)

Depending on the approval, the following Safety Instructions (XA) are supplied with the device. They are an integral part of the Operating Instructions.

Directive Type of protection Category Documentation Option

ATEX Ex ia IIC II 2 G XA00454P BD

ATEX Ex nA IIC II 3 G XA00485P BE

IECEx Ex ia IIC n/a XA00455P IC

CSA C/US Ex ia IIC n/a ZD00232P

(960008976)

FM AEx ia IIC n/a ZD00231P

(960008975)

NEPSI Ex ia IIC n/a XA00456P NA

INMETRO Ex ia IIC n/a XA01066P MA

1) Product Configurator order code for "Approval"

The nameplate indicates the Safety Instructions (XA) that are relevant to the device.

Endress+Hauser 5

Terms and abbreviations

URL OPLMWP

LRL

LRV

URV

Waterpilot FMX21

Item Term/abbreviation Explanation

1 OPL The OPL (over pressure limit = sensor overload limit) for the measuring device depends on the lowest-rated

element, with regard to pressure, of the selected components, i.e. the process connection has to be taken into consideration in addition to the measuring cell. Also observe pressure-temperature dependency. The OPL may only be applied for a limited period of time.

2 MWP The MWP (maximum working pressure) for the sensors depends on the lowest-rated element, with regard to

pressure, of the selected components, i.e. the process connection has to be taken into consideration in addition to the measuring cell. Also observe pressure-temperature dependency. The MWP may be applied at the device for an unlimited period. The MWP can also be found on the nameplate.

3 Maximum sensor

measuring range

4 Calibrated/adjusted span Span between LRV and URV

p - Pressure

- LRL Lower range limit

- URL Upper range limit

- LRV Lower range value

- URV Upper range value

- TD (turn down) Turn down

- PE Polyethylene

- FEP Fluorinated ethylene propylene

- PUR Polyurethane

Span between LRL and URL This sensor measuring range is equivalent to the maximum calibratable/adjustable span.

Factory setting: 0 to URL Other calibrated spans can be ordered as customized spans.

Example - see the following section.

A0029505

6 Endress+Hauser

Waterpilot FMX21

LRV

URLURV

LRL

1 = 2

Turn down calculation

1 Calibrated/adjusted span 2 Zero point-based span (4 to 20 mA Analog: customer-specific span can only be set at the factory when

ordered)

3 URL sensor

Example

• Sensor:10 bar (150 psi)

• Upper range value (URL) = 10 bar (150 psi)

Turn down (TD):

• Calibrated/adjusted span: 0 to 5 bar (0 to 75 psi)

• Lower range value (LRV) = 0 bar (0 psi)

• Upper range value (URV) = 5 bar (75 psi)

A0029545

TD =

URL

|URV - LRV|

10 bar (150 psi)

TD =

|5 bar (75 psi) - 0 bar (0 psi)|

In this example, the TD is 2:1. This span is based on the zero point.

= 2

Endress+Hauser 7

Function and system design

Device version

Outer diameter 22 mm (0.87 in) 42 mm (1.65 in) Max. 29 mm (1.14 in)

Waterpilot FMX21

A0018640

Field of application Hydrostatic level measurement

in deep wells e.g. drinking water

Hydrostatic level measurement in wastewater

A0018641

Hydrostatic level measurement in saltwater

NOTICE

The Waterpilot is not suitable for use in biogas plants since the gases can diffuse through the elastomers (seals, cable).

For applications involving biogas, Endress+Hauser offers the Deltapilot level measuring device.

‣

Process connection • Suspension clamp

• Cable mounting screw with G 1½" A or NPT 1½" thread

Extension cable PE, PUR, FEP →  45

Seals • FKM Viton

• EPDM

Measuring ranges • Relative pressure: 0 to 0.1 bar (0 to 1.5 psi) to

0 to 20 bar (0 to 300 psi)

• Absolute pressure: 0 to 2 bar (0 to 30 psi) to 0 to 20 bar (0 to 300 psi)

FKM Viton • FKM Viton

• EPDM

• Relative pressure: 0 to 0.1 bar (0 to 1.5 psi) to 0 to 4 bar (0 to 60 psi)

• Absolute pressure: 0 to 2 bar (0 to 30 psi) to 0 to 4 bar (0 to 60 psi)

• Customer-specific measuring ranges; factory-calibrated.

• The following output units can be configured: %, mbar, bar, kPa, MPa, mmH2O, mH2O, inH2O, ftH2O, psi and numerous level units.

Overload to 40 bar (600 psi) to 25 bar (375 psi)

Process temperature range –10 to +70 °C (+14 to +158 °F) 0 to +50 °C (+32 to +122 °F)

Reference accuracy • ±0.2 % of the set span

• Optional: ±0.1 % of set span (PLATINUM version)

Supply voltage 10.5 to 35 V DC, Ex: 10.5 to 30 V DC

Output • 4 to 20 mA Analog

• 4 to 20 mA HART (can be inverted) with superimposed digital communication protocol HART 6.0, 2-wire

Options Drinking water approval ―

• Wide range of approvals, including ATEX, FM, CSA

• Numerous accessories

• Integrated Pt100 temperature sensor and TMT181 temperature head transmitter (4 to 20 mA)

• Integrated Pt100 temperature sensor and TMT182 temperature head transmitter (4 to 20 mA HART)

• Marine approval

Specialties • High-precision, robust ceramic measuring cell with long-term stability

• Automatic density compensation

• Customer-specific cable marking

A0018642

1) Recommended for drinking water applications, not suitable for use in hazardous areas.

8 Endress+Hauser

Waterpilot FMX21

atm

hydr.

p = p + p

atm hydr.

atm

h ~ p

r • g

h =

Rel.: p = (p + p ) - p

sens atm hydr. atm

p = p + p

atm hydr.

Abs.: p = (p + p )

sens atm hydr.

Measuring principle

The ceramic measuring cell is a dry measuring cell i.e. the pressure acts directly on the robust, ceramic process isolating diaphragm of the Waterpilot FMX21. Changes in air pressure are guided via a pressure compensation tube through the extension cable to the rear of the ceramic process isolating diaphragm and are compensated for. A pressure-dependent change in capacitance, caused by the movement of the process isolating diaphragm, is measured at the electrodes of the ceramic carrier. The electronics unit then converts this to a signal that is proportional to the pressure and linear to the level.

1 Ceramic measuring cell 2 Pressure compensation tube h Height level p Total pressure = atmospheric pressure + hydrostatic pressure ρ Density of the medium g Acceleration due to gravity P

Hydrostatic pressure

hydr.

Atmospheric pressure

atm

Pressure displayed on the sensor

sens

Temperature measurement with optional Pt100 resistance thermometer

For simultaneous measurement of level and temperature, Endress+Hauser offers the Waterpilot FMX21 with an optional 4-wire Pt100 resistance thermometer →  52. The Pt100 is categorized as Accuracy Class B as per DIN EN 60751.

Temperature measurement with optional Pt100 and TMT181 temperature head transmitter for FMX21 4 to 20 mA Analog

To convert the temperature signal to an analog, scalable 4 to 20 mA output signal, Endress+Hauser also offers the TMT181 temperature head transmitter.

Ordering information: →  50; "Accessories" →  52. Technical Information TI00070R.

Temperature measurement with optional Pt100 and TMT182 temperature head transmitter for FMX21 4 to 20 mA HART

Endress+Hauser also offers the TMT182 temperature head transmitter with HART protocol for converting the temperature signal to an analog, scalable 4 to 20 mA output signal superimposed with HART 6.0. See also: "Density compensation with Pt100 temperature sensor" →  12

Ordering information: →  50; "Accessories" →  52. Technical Information TI00078R.

A0019140

1) Not for use in hazardous areas.

Endress+Hauser 9

Measuring system Application examples

RN221N

RTA421

RIA45RIA15

-+-

RIA45

RIA452

Memograph M

Ecograph T

RIA452

Endress+Hauser

RIA46

12401.5

-+-

As standard, the complete measuring system consists of a Waterpilot FMX21 and a transmitter power supply unit with a supply voltage of 10.5 to 30 V DC (hazardous areas) or 10.5 to 35 V DC (non-hazardous areas).

Possible measuring point solutions with a transmitter and evaluation units from Endress+Hauser:

Waterpilot FMX21

A0018644

1 Waterpilot FMX21 2 4 to 20 mA or 4 to 20 mA HART 3+4 Overvoltage protection, e.g. HAW from Endress+Hauser (not for use in hazardous areas) HAW562; for DIN

rail: HAW562/intrinsically safe HAW562Z. Selection in accordance with supply voltage.

5 Power supply

A: Easy and cost-effective measuring point solution: power supplied to the Waterpilot in hazardous and non-hazardous areas via the RN221N active barrier. Power supply and additional control of two appliances, such as pumps, via the RTA421 limit value switch with local display.

B: The RIA45 evaluation unit (for panel mounting) or the RIA46 evaluation unit (for field installation) offers power supply, local display and two switch outputs. If the RIA15 is used, the basic settings for the FMX21 HART can be made via the display module.

C: If several pumps are used, the pump service life can be prolonged by alternate switching. With alternating pump control, the pump which was out of service for the longest period of time is switched on. The RIA452 evaluation unit (for panel mounting) offers this option in addition to numerous other functions.

D: State-of-the-art recording technology with graphic display recorders from Endress+Hauser, such as Ecograph T, Memograph M for documentation, monitoring, visualization and archiving purposes.

10 Endress+Hauser

Waterpilot FMX21

RIA452

ENDRESS+HAUSER RMA422

RMA42

RIA46

RIA45

12401.5

-+-

RIA45

-+-

RIA45

-+-

RIA45

-+-

RIA45

RIA452

Endress+Hauser

ENDRESS+HAUSER RMA422

RMA42

Application examples with the Pt100

Possible measuring point solutions with a transmitter and evaluation units from Endress+Hauser:

A0018645

1 Waterpilot FMX21 2 Connection for integrated Pt100 in the FMX21 3 Temperature for 4 to 20 mA or 4 to 20 mA HART 4 Level for 4 to 20 mA or 4 to 20 mA HART 5 Overvoltage protection, e.g. HAW from Endress+Hauser (not for use in hazardous areas) on the sensor side

6 Overvoltage protection, e.g. HAW from Endress+Hauser (not for use in hazardous areas) on the supply side

7 Power supply

E: If you wish to measure, display and evaluate the temperature as well as the level, e.g. to monitor the temperature in fresh water for the purpose of detecting temperature limits for germ formation, the options available to you include the following: The optionally available TMT182 temperature head transmitter can convert the Pt100 signal to a 4 to 20 mA signal or a 4 to 20 mA HART signal and transfer it to any commonly used evaluation unit. The RMA42, RIA45 and RIA452 evaluation units also offer a direct input for the Pt100 signal.

for field installation: HAW569; for DIN rail: HAW562/intrinsically safe HAW562Z. Selection in accordance with supply voltage.

for DIN rail: HAW561 (115/230 V) and HAW561K (24/48 V AC/DC). Selection in accordance with supply voltage.

F: If you wish to record and evaluate the level and temperature measured value with one device, use the RMA42, RIA45 and RIA46 evaluation units with two inputs. It is even possible to mathematically

Endress+Hauser 11

link the input signals with this unit. These evaluation units are HART-compatible.

Level measurement with

FXN520

absolute pressure probe and external pressure signal for FMX21 4 to 20 mA HART

Waterpilot FMX21

A0018757

1 Fieldgate FXA520 2 Multidrop Connector FXN520 3 Cerabar 4 Waterpilot FMX21 4 to 20 mA HART

It is advisable to use an absolute pressure probe for applications in which condensation can occur. For level measurement using an absolute pressure probe, the measured value is affected by fluctuations in the ambient pressure. To correct the resulting measured error, you can connect an external absolute pressure sensor (e.g. Cerabar) to the HART signal line, switch the Waterpilot to burst mode and operate the Cerabar in the "Electr. Delta P" mode. The external absolute pressure sensor then calculates the difference between the two pressure signals and can thus determine the level precisely. Only one level measured value can be corrected in this way.

If using intrinsically safe devices, the regulations for interconnecting intrinsically safe circuits as stipulated in IEC60079-14 (proof of intrinsic safety) must be observed.

Density compensation with the Pt100 temperature sensor for FMX21 4 to 20 mA HART

The Waterpilot FMX21 4 to 20 mA HART can correct measured errors that result from fluctuations in the density of the water caused by temperature. Users can choose from the following options:

Use the internally measured sensor temperature of the FMX21

The internally measured sensor temperature is calculated in the Waterpilot FMX21 4 to 20 mA HART for density compensation. The level signal is thus corrected according to the density characteristic line of water.

Use the optional internal temperature sensor for density compensation in a suitable HART master (e.g. PLC)

The Waterpilot FMX21 4 to 20 mA HART is optionally available with a Pt100 temperature sensor. To convert the Pt100 signal to a 4 to 20 mA HART signal, Endress+Hauser also offers the TMT182 temperature head transmitter.

The temperature and pressure signals are queried by a HART master (e.g. PLC), where a corrected level value can be generated using a stored linearization table or density function (of a chosen medium).

A0018763

1 HART master, e.g. PLC (programmable logic controller) 2 FXN520 Multidrop Connector 3 TMT182 temperature head transmitter 4 Waterpilot FMX21 4 to 20 mA HART

12 Endress+Hauser

Waterpilot FMX21

FXN520

Use an external temperature signal, which is transmitted to the FMX21 4 to 20 mA HART via the HART burst mode

The Waterpilot FMX21 4 to 20 mA HART is optionally available with a Pt100 temperature sensor. With this option, the signal of the Pt100 is evaluated with a HART-compliant temperature transmitter (min. HART 5.0) that supports the BURST mode. The temperature signal can thus be transmitted to the FMX21 4 to 20 mA HART. The FMX21 4 to 20 mA HART uses this signal for density correction of the level signal.

The TMT182 temperature head transmitter is not suitable for this configuration.

A0018764

1 Fieldgate FXA520 2 Multidrop Connector FXN520 3 HART-compatible temperature transmitter (e.g. TMT82) 4 Waterpilot FMX21 4 to 20 mA HART

Communication protocol

System integration

Without additional compensation due to the anomaly of water, errors of up to 4% may occur at a temperature of 70 °C (158 °F), for example. With density compensation, this error can be decreased to 0.5 % in the entire temperature range from 0 to +70 °C (+32 to +158 °F).

More information can be found in the Technical Information:

• TI01010T: TMT82 temperature transmitter (4 to 20 mA HART)

• TI00369F: Fieldgate FXA520

• TI00400F: Multidrop Connector FXN520

• 4 to 20 mA Analog Ordering information: Product Configurator order code for "Output", option "1"

• 4...20 mA HART Ordering information: Product Configurator order code for "Output", option "2"

The device can be given a tag name.

Ordering information: Product Configurator order code for "Identification", option "Z1"

Endress+Hauser 13

Input

Measured variable FMX21 + Pt100 (optional)

• Hydrostatic pressure of a liquid

• Pt100: Temperature

TMT181 temperature head transmitter (optional) for FMX21 4 to 20 mA Analog

Temperature

TMT182 temperature head transmitter (optional) for FMX21 4 to 20 mA HART

Temperature

Waterpilot FMX21

Measuring range

• Customer-specific measuring ranges or calibration that has been preset in the factory

• Temperature measurement of –10 to +70 °C (+14 to +158 °F) with Pt100 (optional)

Relative pressure

Sensor measuring range Lowest calibratable span

[bar (psi)] [bar (psi)] [bar

Vacuum resistance Option

(psi

abs

)]

abs

0.1 (1.5) 0.01 (0.15) 0.3 (4.5) 1C

0.2 (3.0) 0.02 (0.3) 0.3 (4.5) 1D

0.4 (6.0) 0.04 (1.0) 0 1F

0.6 (9.0) 0.06 (1.0) 0 1G

1.0 (15.0) 0.1 (1.5) 0 1H

2.0 (30.0) 0.2 (3.0) 0 1K

4.0 (60.0) 0.4 (6.0) 0 1M

10.0 (150)

20.0 (300)

1.0 (15) 0 1P

2.0 (30) 0 1Q

1) Largest turn down that can be configured at the factory: 10:1, higher turn down can be configured on request or in the device (for FMX21 4 to 20 mA HART).

2) Product Configurator order code for "Sensor range"

3) These measuring ranges are not available for the special version with plastic insulation, external diameter of 29 mm (1.14 in).

Absolute pressure

Sensor measuring range Lowest calibratable span

[bar (psi)] [bar (psi)] [bar

Vacuum resistance Option

(psi

abs

)]

abs

2.0 (30.0) 0.2 (3.0) 0 2K

4.0 (60.0) 0.4 (6.0) 0 2M

10.0 (150)

20.0 (300)

1.0 (15) 0 2P

2.0 (30) 0 2Q

1) Largest turn down that can be configured at the factory: 10:1, higher turn down can be configured on request or in the device (for FMX21 4 to 20 mA HART).

2) Product Configurator order code for "Sensor range"

3) These measuring ranges are not available for the special version with plastic insulation, external diameter of 29 mm (1.14 in).

14 Endress+Hauser

Waterpilot FMX21

Input signal FMX21 + Pt100 (optional)

• Change in capacitance

• Pt100: Change in resistance

TMT181 temperature head transmitter (optional) for FMX21 4 to 20 mA Analog

Pt100 resistance signal, 4 wire

TMT182 temperature head transmitter (optional) for FMX21 4 to 20 mA HART

Pt100 resistance signal, 4 wire

Endress+Hauser 15

Output

Lmax

– 2 0.09•

• L – R

U – 10.5 V

23 mA

413

630

195

1065

10.5

847

[ ]W

[ ]

– R

U – 8 V

0.025 A

Lmax

20 25158

1080

880

480

280

680

[ ]W

[ ]

add

Output signal FMX21 + Pt100 (optional)

• 4 to 20 mA Analog, 2-wire for hydrostatic pressure measured value.

Ordering information: Product Configurator order code for "Output", option "1"

• 4 to 20 mA HART with superimposed digital communication protocol HART 6.0, 2-wire for

hydrostatic pressure measured value. Ordering information: Product Configurator order code for "Output", option "2" Options: – Max. alarm (factory setting 22mA): can be set from 21 to 23 mA – Hold measured value: last measured value is held – Min. alarm: 3.6 mA

• Pt100: temperature-dependent resistance value

TMT181 temperature head transmitter (optional) for FMX21 4 to 20 mA Analog

4 to 20 mA Analog for temperature measured value, 2-wire

TMT182 temperature head transmitter (optional) for FMX21 4 to 20 mA HART

4 to 20 mA HART with superimposed digital communication protocol HART 5.0 for temperature measured value, 2-wire

Waterpilot FMX21

Signal range

Maximum load for FMX21 4 to 20 mA Analog

3.8 mA to 20.5 mA

The maximum load resistance depends on the supply voltage (U) and must be determined individually for each current loop, see formula and diagrams for FMX21 and temperature head transmitter. The total resistance resulting from the resistances of the connected devices, the connecting cable and, where applicable, the resistance of the extension cable may not exceed the load resistance value.

A FMX21 4 to 20 mA Analog load chart for estimating the load resistance. Additional resistances, such as the

resistance of the extension cable, have to be subtracted from the value calculated as shown in the equation.

B Load diagram for TMT181 temperature head transmitter for estimating the load resistance. Additional

resistances must be subtracted from the value calculated as shown in the equation

Max. load resistance [Ω]

Lmax

Additional resistances such as resistance of evaluating device and/or display unit, cable resistance [Ω]

add

U Supply voltage [V] L Basic length of extension cable [m] (cable resistance per wire 0.09 Ω/m)

Maximum load for FMX21 4 to 20 mA HART

16 Endress+Hauser

The maximum load resistance depends on the supply voltage (U) and must be determined individually for each current loop, see formula and diagrams for FMX21 and temperature head

When using the measuring device in hazardous areas, installation must comply with the corresponding national standards and regulations and the Safety Instructions or Installation or Control Drawings (XA).

A0030561-EN

Waterpilot FMX21

Lmax

– 2 0.09•

• L – R

U – 10.5 V

23 mA

413

630

195

1065

10.5

847

[ ]W

[ ]

– R

U – 11.5 V

0.023 A

Lmax

370

587

152

1022

11.5

804

[ ]W

[ ]

A B

add add

transmitter. The total resistance resulting from the resistances of the connected devices, the connecting cable and, where applicable, the resistance of the extension cable may not exceed the load resistance value.

A0026500-EN

A FMX21 4 to 20 mA HART load chart for estimating the load resistance. Additional resistances, such as the

resistance of the extension cable, have to be subtracted from the value calculated as shown in the equation.

B Load diagram for TMT182 temperature head transmitter for estimating the load resistance. Additional

resistances must be subtracted from the value calculated as shown in the equation

Max. load resistance [Ω]

Lmax

Additional resistances such as resistance of evaluating device and/or display unit, cable resistance [Ω]

add

U Supply voltage [V] L Basic length of extension cable [m] (cable resistance per wire 0.09 Ω/m)

• When using the measuring device in hazardous areas, installation must comply with the corresponding national standards and regulations and the Safety Instructions or Installation or Control Drawings (XA).

• When operating via a handheld terminal or via a PC with an operating program, a minimum communication resistance of 250 Ω must be taken into account.

Damping for FMX21 4 to 20 mA HART

• Via HART handheld device or PC with operating program: continuous from 0 to 999 s

• Factory setting: 2 s

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Endress+Hauser FMX21 Specifications

Table of contents

About this document

Document function

Symbols used Safety symbols

Supplementary documentation

Terms and abbreviations

Turn down calculation

Function and system design

Device version

Measuring principle

Measuring system Application examples

Density compensation with the Pt100 temperature sensor for FMX21 4 to 20 mA HART

Communication protocol

System integration

Input

Measured variable FMX21 + Pt100 (optional)

Measuring range

Input signal FMX21 + Pt100 (optional)

Output

Output signal FMX21 + Pt100 (optional)

Signal range

Maximum load for FMX21 4 to 20 mA Analog

Maximum load for FMX21 4 to 20 mA HART

Damping for FMX21 4 to 20 mA HART