Endress+Hauser Waterpilot FMX21 Technical specifications

Products Solutions Services
Brief Operating Instructions
Waterpilot FMX21
Hydrostatic level measurement
4 to 20 mA analog
These Instructions are Brief Operating Instructions; they are
not a substitute for the Operating Instructions pertaining to
the device.
Detailed information about the device can be found in the
Operating Instructions and the other documentation:
Available for all device versions via:
• Internet: www.endress.com/deviceviewer
• Smart phone/tablet: Endress+Hauser Operations App
KA01244P/00/EN/02.22-00
71593283
2022-09-12

Waterpilot FMX21
2 Endress+Hauser
1.
Order code:
Ext. ord. cd.:
Ser. no.:
www.endress.com/deviceviewer Endress+Hauser Operations App
XXXXXXXXXXXX
XXXXX-XXXXXX
XXX.XXXX.XX
Serial number
2.
3.
A0023555

Waterpilot FMX21 Table of contents
Endress+Hauser 3
Table of contents
1 About this document .............................................................. 3
1.1 Document function ..................................................................... 3
1.2 Symbols ............................................................................. 4
1.3 Documentation ........................................................................ 6
1.4 Registered trademarks .................................................................. 6
1.5 Terms and abbreviations ................................................................. 7
1.6 Turn down calculation ................................................................... 8
2 Basic safety instructions .......................................................... 9
2.1 Requirements for personnel .............................................................. 9
2.2 Intended use .......................................................................... 9
2.3 Workplace safety ...................................................................... 9
2.4 Operational safety ......................................................................9
2.5 Product safety ........................................................................ 10
3 Incoming acceptance and product identification ................................. 10
3.1 Incoming acceptance ................................................................... 10
3.2 Product identification .................................................................. 11
3.3 Nameplates ......................................................................... 11
3.4 Storage and transport .................................................................. 12
4 Mounting ....................................................................... 14
4.1 Mounting requirements ................................................................ 14
4.2 Additional mounting instructions ......................................................... 15
4.3 Mounting the Waterpilot with a suspension clamp ............................................. 16
4.4 Mounting the device with a cable mounting screw ............................................. 17
4.5 Mounting the terminal box .............................................................. 18
4.6 Mounting the TMT71 temperature head transmitter with terminal box ............................. 18
4.7 Cable marking ....................................................................... 20
4.8 Post-mounting check .................................................................. 20
5 Electrical connection ............................................................ 21
5.1 Connecting the device .................................................................. 21
5.2 Supply voltage ....................................................................... 24
5.3 Cable specifications .................................................................... 24
5.4 Power consumption ................................................................... 24
5.5 Current consumption .................................................................. 25
5.6 Connecting the measuring unit ........................................................... 25
5.7 Post-connection check ..................................................................27
6 Operation options ............................................................... 27
6.1 Overview of operation options ............................................................ 27
1 About this document
1.1 Document function
The Brief Operating Instructions contain all the essential information from incoming
acceptance to initial commissioning.

About this document Waterpilot FMX21
4 Endress+Hauser
1.2 Symbols
1.2.1 Safety symbols
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.
NOTICE
This symbol contains information on procedures and other facts which do not result in
personal injury.
1.2.2 Electrical symbols
Direct current
Alternating current
Direct and alternating current
Ground connection
Grounded clamp, which is grounded via a grounding system.
Protective earth (PE)
Ground terminals, which must be grounded prior to establishing any other connections. The
ground terminals are located on the inside and outside of the device.
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.
1.2.3 Tool symbols
Flat blade screwdriver
Phillips screwdriver
Allen key
Open-ended wrench

Waterpilot FMX21 About this document
Endress+Hauser 5
1.2.4 Symbols for certain types of information
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
Reference to page
Reference to graphic
1.
,
2.
,
3.
Series of steps
Result of a step
Help in the event of a problem
Visual inspection
1.2.5 Symbols in graphics
1, 2, 3, ...
Item numbers
1.
,
2.
,
3.
Series of steps
A, B, C, ...
Views
A-A, B-B, C-C etc.
Sections

About this document Waterpilot FMX21
6 Endress+Hauser
1.3 Documentation
The following types of documentation are available in the Download Area of the Endress
+Hauser website (www.endress.com/downloads):
For an overview of the scope of the associated Technical Documentation, refer to the
following:
•W@M Device Viewer (www.endress.com/deviceviewer): Enter the serial number from
the nameplate
•Endress+Hauser Operations App: Enter the serial number from the nameplate or scan
the matrix code on the nameplate
1.3.1 Operating Instructions (BA)
Your reference guide
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.
1.3.2 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.
The nameplate indicates the Safety Instructions (XA) that are relevant to the device.
1.4 Registered trademarks
1.4.1 GORE-TEXâ
Trademark of W.L. Gore & Associates, Inc., USA.
1.4.2 TEFLONâ
Trademark of E.I. Du Pont de Nemours & Co., Wilmington, USA.
1.4.3 iTEMPâ
Trademark of Endress+Hauser Wetzer GmbH + Co. KG, Nesselwang, D..

Waterpilot FMX21 About this document
Endress+Hauser 7
1.5 Terms and abbreviations
URL OPLMWP
LRL
0
p
LRV URV
1
2
3
4
A0029505
•OPL (1)
The OPL (Over Pressure 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.
•MWP (2)
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.
•Maximum sensor measuring range (3)
Span between LRL and URL. This sensor measuring range is equivalent to the maximum
calibratable/adjustable span.

About this document Waterpilot FMX21
8 Endress+Hauser
•Calibrated/adjusted span (4)
Span between LRV and URV. Factory setting: 0 to URL
Other calibrated spans can be ordered as customized spans.
•p: Pressure
•LRL: Lower range limit
•URL: Upper range limit
•LRV: Lower range value
•URV: Upper range value
•TD (Turn down): Example - see the following section
•PE: Polyethylene
•FEP: Fluorinated ethylene propylene
•PUR: Polyurethane
1.6 Turn down calculation
LRV URLURV LRL
1 = 2 3
A0029545
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)
TD =
URL
|URV - LRV|
TD =
10 bar (150 psi)
= 2
|5 bar (75 psi) - 0 bar (0 psi)|
In this example, the TD is 2:1.
This span is based on the zero point.

Waterpilot FMX21 Basic safety instructions
Endress+Hauser 9
2 Basic safety instructions
2.1 Requirements for personnel
The personnel must fulfill the following requirements for its tasks:
‣Trained, qualified specialists must have a relevant qualification for this specific function
and task.
‣Personnel must be authorized by the plant owner/operator.
‣Personnel must be familiar with federal/national regulations.
‣Before starting work: personnel must read and understand the instructions in the manual
and supplementary documentation as well as the certificates (depending on the
application).
‣Personnel must follow instructions and comply with general policies.
2.2 Intended use
2.2.1 Application and media
The Waterpilot FMX21 is a hydrostatic pressure sensor for measuring the level of fresh water,
wastewater and salt water. The temperature is measured simultaneously in the case of sensor
versions with a Pt100 resistance thermometer.
An optional temperature head transmitter converts the Pt100 signal into a 4 to 20 mA signal.
2.2.2 Incorrect use
The manufacturer is not liable for damage caused by improper or non-intended use.
Verification for borderline cases:
‣For special fluids and fluids for cleaning, Endress+Hauser is glad to provide assistance in
verifying the corrosion resistance of fluid-wetted materials, but does not accept any
warranty or liability.
2.3 Workplace safety
For work on and with the device:
‣Wear the required personal protective equipment according to federal/national
regulations.
‣Switch off the supply voltage before connecting the device.
2.4 Operational safety
Risk of injury!
‣Operate the device in proper technical condition and fail-safe condition only.
‣The operator is responsible for interference-free operation of the device.
Modifications to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers.
‣If, despite this, modifications are required, consult with Endress+Hauser.

Incoming acceptance and product identification Waterpilot FMX21
10 Endress+Hauser
Repairs
To ensure continued operational safety and reliability,
‣Carry out repairs on the device only if they are expressly permitted.
‣Observe federal/national regulations pertaining to repair of an electrical device.
‣Use original spare parts and accessories from Endress+Hauser only.
Hazardous area
To eliminate danger to persons or the facility when the device is used in the approval-related
area (e.g. explosion protection, pressure vessel safety):
‣Check the nameplate to verify if the device ordered can be put to its intended use in the
approval-related area.
‣Observe the specifications in the separate supplementary documentation that is an integral
part of these Instructions.
2.5 Product safety
This measuring device is designed in accordance with good engineering practice to meet state-
of-the-art safety requirements, has been tested, and left the factory in a condition in which it
is safe to operate.
It meets general safety standards and legal requirements. It also complies with the EC
directives listed in the device-specific EC Declaration of Conformity. Endress+Hauser confirms
this by affixing the CE mark to the device.
3 Incoming acceptance and product identification
3.1 Incoming acceptance
Check the following during incoming acceptance:
 Are the order codes on the delivery note and the product sticker identical?
 Are the goods undamaged?
 Do the data on the nameplate match the ordering information on the delivery note?
 If required (see nameplate): are the Safety Instructions e.g. XA provided?
If one of these conditions is not met, please contact the manufacturer's sales office.

Waterpilot FMX21 Incoming acceptance and product identification
Endress+Hauser 11
3.2 Product identification
The following options are available for identification of the device:
• Nameplate specifications
• Extended order code with breakdown of the device features on the delivery note
• Enter serial number of nameplates in W@M Device Viewer
www.endress.com/deviceviewer. All of the information on the measuring device is
displayed along with an overview of the scope of technical documentation provided.
• Enter the serial number on the nameplate into the Endress+Hauser Operations app or scan
the 2-D matrix code on the nameplate with the Endress+Hauser Operations app
3.2.1 Manufacturer address
Endress+Hauser SE+Co. KG
Hauptstraße 1
79689 Maulburg, Germany
Address of the manufacturing plant: See nameplate.
3.3 Nameplates
3.3.1 Nameplates on extension cable
Dat./Insp.:
FW.Ver.:
Dev.Rev.:
Cal./Adj.
Mat: L=
Ser. no.:
Order code:
Ext. order code:
TAG:
Waterpilot FMX21
Made in Germany, D-79689 Maulburg
p
12
17
16
15
14
3 4
5
6/7
89
101112
13
A0018802
1 Order code (shortened for reordering); The meaning of the individual letters and digits is explained in
the order confirmation details.
2 Extended order number (complete)
3 Serial number (for clear identification)
4-17 See the Operating Instructions

Incoming acceptance and product identification Waterpilot FMX21
12 Endress+Hauser
Additional nameplate for devices with approvals
Mat.: 316L/1.4435/1.4404, Al O , PE, EPDM, PPO
2 3 For use in drinking water according to:
Made in Germany, D-79689 Maulburg
Waterpilot FMX21
250002737-B
1
23
A0018805
1 Approval symbol (drinking water approval)
2 Reference to associated documentation
3 Approval number (marine approval)
3.3.2 Additional nameplate for devices with external diameter 22 mm (0.87 in) and
42 mm (1.65 in)
x
Install per dwg. 96000xxxx-
Ser.-No.:
p
Waterpilot FMX21
Cal./Adj.
1 2 3 4 5 6 7
A0018804
1 Serial number
2 Nominal measuring range
3 Set measuring range
4 CE mark or approval symbol
5 Certificate number (optional)
6 Text for approval (optional)
7 Reference to documentation
3.4 Storage and transport
3.4.1 Storage conditions
Use original packaging.
Store the measuring device in clean and dry conditions and protect from damage caused by
shocks (EN 837-2).

Waterpilot FMX21 Incoming acceptance and product identification
Endress+Hauser 13
Storage temperature range
Device + Pt100 (optional)
–40 to +80 °C (–40 to +176 °F)
Cable
(when mounted in a fixed position)
• With PE: –30 to +70 °C (–22 to +158 °F)
• With FEP: –30 to +80 °C (–22 to +176 °F)
• With PUR: –40 to +80 °C (–40 to +176 °F)
Terminal box
–40 to +80 °C (–40 to +176 °F)
TMT71 temperature head transmitter (optional)
–40 to +100 °C (–40 to +212 °F)
3.4.2 Transporting the product to the measuring point
LWARNING
Incorrect transport!
Device or cable may become damaged, and there is a risk of injury!
‣Transport measuring device in the original packaging.
‣Follow the safety instructions and transport conditions for devices weighing more than 18
kg (39.6 lbs).

Mounting Waterpilot FMX21
14 Endress+Hauser
4 Mounting
4.1 Mounting requirements
1
2
3
4
5
6
7
8
9
Dat./Insp.:
FW.Ver.:xxxx
Dev.Rev.:xxxx
Cal./Adj.
Mat: L=
Ser.no.: xxxxxxxxxxxxx
Ordercode: xxxxxxxxxxxxxxxxxxxxxx
Ext.order code: xxxxxxxxxxxxxxxxxxxxxx
TAG:xxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxx
Waterpilot FMX21
Madein Germany, D-79689 Maulburg
p
Exia IIC T6-T4
£
-10°C Ta 70°C
£Ta 40°CforT6
£
Ta 70°CforT4
£
Ui 30VDC ; Ii 133mA; Pi 1W
£££
II2G
Ci=5nF + 180pF/m ; Li= 1 µH/m
Warning!
Avoid electrostatic
charge
0...400mbar
4...20 mA
0...600mbar red +
black -
yellow-green
4…20mA
Sensor
250002736--
10,5...35VDC
XAxxxxxP-
XX/XXXX
TÜV01 ATEX 1685
PPS/Polyolefin AL2O3 FEP EPDM
OPEN
CLOSE
90°
90°
Warning:
Avoid electrostatic charge in explosive atmosphere.
See instructions
TerminalBox for FMX21
A0018770
1 Cable mounting screw (can be ordered as an accessory)
2 Terminal box (can be ordered as an accessory)
3 Bending radius of extension cable 120 mm (4.72 in)
4 Suspension clamp (can be ordered as an accessory)
5 Extension cable
6 Guide tube

Waterpilot FMX21 Mounting
Endress+Hauser 15
7 Device
8 Additional weight can be ordered as an accessory for the device with external diameter of
22 mm (0.87 in) and 29 mm (1.14 in)
9 Protective cap
4.2 Additional mounting instructions
• Cable length
• Customer-specific in meters or feet.
• Limited cable length when performing installation with freely suspended device with
cable mounting screw or mounting clamp, as well as for FM/CSA approval: max.
300 m (984 ft).
• Sideways movement of the level probe can result in measuring errors. For this reason,
install the probe at a point free from flow and turbulence, or use a guide tube. The internal
diameter of the guide tube should be at least 1 mm (0.04 in) greater than the external
diameter of the selected FMX21.
• To avoid mechanical damage to the measuring cell, the device is equipped with a protection
cap.
• The cable must end in a dry room or a suitable terminal box. The terminal box from Endress
+Hauser provides humidity and climatic protection and is suitable for installation outdoors
(see the Operating Instructions for additional information).
• Cable length tolerance: < 5 m (16 ft): ±17.5 mm (0.69 in); > 5 m (16 ft): ±0.2 %
• If the cable is shortened, the filter at the pressure compensation tube must be reattached.
Endress+Hauser offers a cable shortening kit for this purpose (see the Operating
Instructions for additional information) (documentation SD00552P/00/A6).
• Endress+Hauser recommends using twisted, shielded cable.
• In shipbuilding applications, measures are required to restrict the spread of fire along cable
looms.
• The length of the extension cable depends on the intended level zero point. The height of
the protection cap must be taken into consideration when designing the layout of the
measuring point. The level zero point (E) corresponds to the position of the process
isolating diaphragm. Level zero point = E; tip of probe = L (see the following diagram).
L
E
A0026013

Mounting Waterpilot FMX21
16 Endress+Hauser
4.3 Mounting the Waterpilot with a suspension clamp
1
2
3
A0018793
1 Extension cable
2 Suspension clamp
3 Clamping jaws
4.3.1 Mounting the suspension clamp:
1. Mount the suspension clamp (item 2). Take the weight of the extension cable (item 1)
and the device into account when selecting the fastening point.
2. Push up the clamping jaws (item 3). Place the extension cable (item 1) between the
clamping jaws as shown in the graphic.
3. Hold the extension cable (item 1) in position and push the clamping jaws (item 3) back
down. Tap the clamping jaws gently from above to fix them in place.

Waterpilot FMX21 Mounting
Endress+Hauser 17
4.4 Mounting the device with a cable mounting screw
+40
( +1.57)
1
6
8
7
2
3
4
5
36
41
A0018794
 1 Illustrated with G 1½" thread. Unit of measurement mm (in)
1 Extension cable
2 Cover for cable mounting screw
3 Sealing ring
4 Clamping sleeves
5 Adapter for cable mounting screw
6 Top edge of clamping sleeve
7 Desired length of extension cable and Waterpilot probe prior to assembly
8 After assembly, item 7 is located next to the mounting screw with G 1½" thread: height of sealing
surface of the adapter or NPT 1½" thread height of thread run-out of adapter
If you want to lower the level probe to a certain depth, position the top edge of the
clamping sleeve 40 mm (4.57 in) higher than the required depth. Then push the
extension cable and the clamping sleeve into the adapter as described in Step 6 in the
following section.
4.4.1 Mounting the cable mounting screw with a G 1½" or NPT 1½" thread:
1. Mark the desired length of extension cable on the extension cable.
2. Insert the probe through the measuring aperture and carefully lower on the extension
cable. Fix the extension cable to prevent it from slipping.
3. Slide the adapter (item 5) over the extension cable and screw it tightly into the
measuring aperture.
4. Slide the sealing ring (item 3) and cover (item 2) onto the cable from above. Press the
sealing ring into the cover.

Mounting Waterpilot FMX21
18 Endress+Hauser
5. Place the clamping sleeves (item 4) around the extension cable (item 1) at the marked
point as illustrated in the graphic.
6. Slide the extension cable with the clamping sleeves (item 4) into the adapter (item 5)
7. Fit the cover (item 2) with the sealing ring (item 3) onto the adapter (item 5) and
securely screw together with the adapter.
To remove the cable mounting screw, perform this sequence of steps in reverse.
LCAUTION
Risk of injury!
‣Use only in unpressurized vessels.
4.5 Mounting the terminal box
The optional terminal box is mounted using four screws (M4). For the dimensions of the
terminal box, see the Technical Information
4.6 Mounting the TMT71 temperature head transmitter with termi-
nal box
1
3
2
6
5
4
3
CLOSE
90°
OPEN
90°
Warning:
Avoid electrostatic charge in explosive atmosphere.
See instructions
Terminal Box for FMX21
1
2
3
45
A0018813
1 Mounting screws
2 Mounting springs
3 TMT71 temperature head transmitter
4 Circlips
5 Terminal box
Only open the terminal box with a screwdriver.

Waterpilot FMX21 Mounting
Endress+Hauser 19
LWARNING
Explosion Hazard!
‣The TMT71 is not designed for use in hazardous areas.
4.6.1 Mounting the temperature head transmitter:
1. Guide the mounting screws (item 1) with the mounting springs (item 2) through the
bore of the temperature head transmitter (item 3)
2. Secure the mounting screws with the circlips (item 4). Circlips, mounting screws and
springs are included in the scope of delivery for the temperature head transmitter.
3. Screw the temperature head transmitter into the field housing tightly. (Width of
screwdriver blade max. 6 mm (0.24 in))
NOTICE
Avoid damage to the temperature head transmitter.
‣Do not overtighten the mounting screw.
>7 (0.28)1 2 3
A0018696
Unit of measurement mm (in)
1 Terminal box
2 Terminal strip
3 TMT71 temperature head transmitter
NOTICE
Incorrect mounting!
‣A distance of > 7 mm (28 in) must be maintained between the terminal strip and the
TMT71 temperature head transmitter.

Mounting Waterpilot FMX21
20 Endress+Hauser
4.7 Cable marking
A0030955
• To make installation easier, Endress+Hauser marks the extension cable if a customer-
specific length has been ordered.
• Cable marking tolerance (distance to lower end of level probe):
Cable length < 5 m (16 ft): ±17.5 mm (0.69 in)
Cable length > 5 m (16 ft): ±0.2 %
• Material: PET, stick-on label: acrylic
• Immunity to temperature change: –30 to +100 °C (–22 to +212 °F)
NOTICE
The marking is used exclusively for installation purposes.
‣The mark must be thoroughly removed without trace in the case of devices with drinking
water approval. The extension cable must not be damaged in the process.
Not for the use of the device in hazardous areas.
4.8 Post-mounting check
• Is the device undamaged (visual inspection)?
• Does the device conform to the measuring point specifications?
• Process temperature
• Process pressure
• Ambient temperature
• Measuring range
• Are the measuring point identification and labeling correct (visual inspection)?
• Check that all screws are firmly seated