Endress+Hauser Waterpilot FMX21 User manual

Products Solutions Services
BA00380P/00/EN/14.13
71205221
Valid from software version:
01.00.zz
Operating Instructions
Waterpilot FMX21
Hydrostatic level measurement

Waterpilot FMX21
2Endress+Hauser
Table of contents
1 About this document . . . . . . . . . . . . . . . 3
1.1 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Registered trademarks . . . . . . . . . . . . . . . . . . . . . . . 4
2 Basic safety instructions . . . . . . . . . . . . 5
2.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Installation, commissioning and operation . . . . . . 5
2.3 Operational safety and process safety . . . . . . . . . . 5
3 Incoming acceptance and product
identification . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Incoming acceptance . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Product identification . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3 Transport and storage . . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5 CE mark, Declaration of Conformity . . . . . . . . . . . . 8
4 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Mounting requierements . . . . . . . . . . . . . . . . . . . . . 9
4.2 Mounting the Waterpilot with a mounting
clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 Mounting with an extension cable mounting
screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Mounting the terminal box . . . . . . . . . . . . . . . . . 12
4.5 Mounting the TMT182 temperature head
transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.6 Mounting the terminal strip for the Pt100 passive
(without TMT182) . . . . . . . . . . . . . . . . . . . . . . . . 13
4.7 Post-mounting check . . . . . . . . . . . . . . . . . . . . . . 13
5 Electrical connection. . . . . . . . . . . . . . . 14
5.1 Connecting the device . . . . . . . . . . . . . . . . . . . . . 14
5.2 Connecting the measuring unit . . . . . . . . . . . . . . 18
5.3 Post-connection check . . . . . . . . . . . . . . . . . . . . . 22
6 Operability . . . . . . . . . . . . . . . . . . . . . . . 22
6.1 Overview of operation options . . . . . . . . . . . . . . 22
7 Commissioning . . . . . . . . . . . . . . . . . . . 24
7.1 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.2 Commissioning with FieldCare . . . . . . . . . . . . . . 24
7.3 Pressure measurement . . . . . . . . . . . . . . . . . . . . . 27
7.4 Level measurement . . . . . . . . . . . . . . . . . . . . . . . . 29
7.5 Linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
8 Troubleshooting . . . . . . . . . . . . . . . . . . 48
8.1 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
8.2 Malfunctions of Waterpilot FMX21 with optional
Pt100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
8.3 Malfunctions of TMT182 temperature head
transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
8.4 Firmware history . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9 Maintenance . . . . . . . . . . . . . . . . . . . . . .51
9.1 Exterior cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
10 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
10.1 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
10.2 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
10.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
11 Accessories . . . . . . . . . . . . . . . . . . . . . . .52
11.1 Mounting clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
11.2 Terminal box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
11.3 Additional weight for Waterpilot with outer
diameter of 22 mm (0.87 in) and 29 mm
(1.14 in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
11.4 TMT182 temperature head transmitter
(4 to 20 mA HART) . . . . . . . . . . . . . . . . . . . . . . . . 53
11.5 Extension cable mounting screw . . . . . . . . . . . . . 53
11.6 Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
11.7 Cable marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
11.8 Cable shortening kit . . . . . . . . . . . . . . . . . . . . . . . . 54
11.9 Testing adapter for FMX21 with outer diameter of
22 mm (0.87 in) and outer diameter of 29 mm
(1.14 in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
12 Technical data. . . . . . . . . . . . . . . . . . . . .55
13 Appendix . . . . . . . . . . . . . . . . . . . . . . . . .56
13.1 Overview of the operating menu . . . . . . . . . . . . . 56
13.2 Description of parameters . . . . . . . . . . . . . . . . . . . 64
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

Waterpilot FMX21 About this document
Endress+Hauser 3
1 About this document
1.1 Symbols
1.1.1 Safety symbols
1.1.2 Electrical symbols
1.1.3 Symbols for certain types of information
Symbol Meaning
A0011189-DE
DANGER!
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
seriousor fatal injury.
A0011190-DE
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
seriousor fatal injury.
A0011191-DE
CAUTION!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minoror medium injury.
A0011192-DE
NOTICE!
This symbol contains information on procedures and other facts which do not result in per-
sonalinjury.
Symbol Meaning
A0018335
Direct current
A terminal to which DC voltage is applied or through which direct current flows.
A0018336
Alternating currrent
A terminal to which alternating voltage is applied or through which alternating current
flows.
A0018337
Direct current and alternating current
• A terminal to which alternating voltage or DC voltage is applied.
• A terminal through which alternating current or direct current flows.
A0018338
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a
grounding system..
A0018339
Protective ground connection
A terminal which must be connected to ground prior to establishing any other connections.
A0011201
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 praxis.
Symbol Meaning
A0011193
Tip
Indicates additional information.
A0015484
Reference to page
Refers to the corresponding page number.
DANGER
WARNING
CAUTION
NOTICE

About this document Waterpilot FMX21
4Endress+Hauser
1.1.4 Symbols in graphics
1.1.5 Symbols at the device
1.2 Registered trademarks
GORE-TEX®
Trademark of W.L. Gore & Associates, Inc., USA.
TEFLON®
Trademark of E.I. Du Pont de Nemours & Co., Wilmington, USA.
HART®
Trademark of the HART Communication Foundation, Austin, USA.
FieldCare®
Trademark of Endress+Hauser Process Solutions AG.
iTEMP®
Trademark of Endress+Hauser Wetzer GmbH + Co. KG, Nesselwang, D.
Symbol Meaning
1, 2, 3, 4, ... Item numbers
A, B, C, D, ... Views
A0011187
Hazardous area
Indicates a hazardous area.
A0011188
Safe area (non-hazardous area)
Indicates a non-hazardous location.
Symbol Meaning
Connecting cable immunity to temperature change
Indicates that the connecting cables must be able to withstand temperatures of at least
85 °C (185 °F).
-
.
t >85°C

Waterpilot FMX21 Basic safety instructions
Endress+Hauser 5
2 Basic safety instructions
2.1 Designated use
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 to a 4 to 20 mA signal with superimposed digital
communication protocol HART 6.0.
The manufacturer accepts no liability for damages resulting from incorrect use or use other
than that designated.
2.2 Installation, commissioning and operation
The Waterpilot FMX21 and the (optional) TMT182 temperature head transmitter are
designed to meet state-of-the-art safety requirements and comply with applicable
regulations and EC Directives. If used incorrectly or for applications for which they are not
intended, the devices can be a source of application-related danger, e.g. product overflow
due to incorrect installation or configuration. For this reason, installation, connection to the
electricity supply, commissioning, operation and maintenance of the measuring system
must only be carried out by trained, qualified specialists authorized to perform such work by
the facility's owner-operator. The specialist staff must have read and understood these
Operating Instructions and must follow the instructions they contain. Modifications and
repairs to the devices are permissible only if they are expressly allowed in the Operating
Instructions. Pay particular attention to the data and information on the nameplate.
2.3 Operational safety and process safety
Alternative monitoring measures have to be taken while configuring, testing or servicing the
device to ensure the operational and process safety.
2.3.1 Hazardous area (optional)
Devices for use in hazardous areas bear an additional marking on the nameplate (ä6).
If using the measuring system in hazardous areas, the appropriate national standards and
regulations must be observed. The device is accompanied by separate Ex documentation,
which is an integral part of this documentation. The installation regulations, connection
values and safety instructions listed in this document must be observed. The documentation
number of the related Safety Instructions (XA) is also indicated on the nameplate.
• Ensure that all personnel are suitably qualified.
• Measuring point requirements with regard to measurement and safety must be observed.
• Please refer to the "Ordering information" section of Technical Information TI00431P/00/
EN for versions for approvals in the order code.

Incoming acceptance and product identification Waterpilot FMX21
6Endress+Hauser
3 Incoming acceptance and product
identification
3.1 Incoming acceptance
• Check the packaging and the contents for damage.
• Check the shipment, make sure nothing is missing and that the scope of supply matches
your order.
3.2 Product identification
The following options are available for identification of the measuring device:
• Nameplate specifications
• Order code with breakdown of the device features on the delivery note
• Enter serial numbers from nameplates in W@M Device Viewer (www.endress.com/
deviceviewer): All information about the measuring device is displayed
3.2.1 Identifying the measuring device via the nameplate
The nameplate is secured to the extension cable of the FMX21 (ä9).
A0018802
1 Order code (reduced for re-orders)
See the specifications on the order confirmation for the meanings of the individual letters and digits.
2 Extended order code (complete)
3 Serial number (for identification)
4TAG(tagname)
5 FMX21 connection diagram
6 Pt100 connection diagram (optional)
7 Warning (hazardous area), (optional)
8 Length of the extension cable
9 Approval symbol, e.g. CSA, FM, ATEX (optional)
10 Text for approval (optional)
11 Wetted materials
12 Test date (optional)
13 Software version/Device Revision
14 Supply voltage
15 Output signal
16 Nominal measuring range
17 Set measuring range
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
34
5
6/7
89
101112
13

Waterpilot FMX21 Incoming acceptance and product identification
Endress+Hauser 7
In addition, the FMX21 with an outer diameter of 22 mm (0.87 in) and 42 mm (1.65 in) also
bears the following information:
A0018804
1 Serial number
2 Nominal measuring range
3Setmeasuringrange
4 CE mark or approval symbol
5 Certificate number (optional)
6 Text for approval (optional)
7 Reference to documentation (
ä 5)
Nameplate for additional approvals
A0018805
1 Approval symbol (drinking water approval)
2 Reference to appropriate documentation
3 Approval number (marine approval)
3.2.2 Identifying the measuring device via the order code
Specific device features make up the order code. You can assign these features in the
"Ordering information" section of Technical Information TI00431P/00/EN.
3.2.3 Identifying the sensor type
In the case of relative pressure or gauge pressure sensors, the "Pos. zero adjust" parameter
appears in the operating menu. In the case of absolute pressure sensors, the "Position offset"
parameter appears in the operating menu.
x
Install per dwg. 96000xxxx-
Ser.-No.:
p
Waterpilot FMX21
Cal./Adj.
123 4 5 6 7
Mat.: 316L/1.4435/1.4404, Al O , PE, EPDM, PPO
23 For use in drinking water according to:
Made in Germany, D-79689 Maulburg
Waterpilot FMX21
250002737-B
1
23

Incoming acceptance and product identification Waterpilot FMX21
8Endress+Hauser
3.3 Transport and storage
3.3.1 Transport
NOTICE
Devices or cable may be damaged
‣Comply with the safety instructions, transport conditions for devices over 18 kg (39.6lbs)
(DIN EN 61010-1).
‣Transport the measuring device to the measuring point in its original packaging.
3.3.2 Storage
The device must be stored in a dry, clean area and protected against damage from impact
(EN 837-2).
Storage temperature range:
• FMX21: –40 to +80 °C (–40 to +176 °F)
• TMT182: –40 to +100 °C (–40 to +212 °F)
• Terminal box: –40 to +80 °C (–40 to +176 °F)
3.4 Scope of delivery
The scope of delivery comprises:
• Waterpilot FMX21, optionally with integrated Pt100 resistance thermometer
• Optional accessories (ä52)
Documentation supplied:
• Operating Instructions BA00380P/00/EN (this document)
• Final inspection report
• Drinking water approval (optional): SD00289P, SD00319P, SD00320P
• Devices suitable for use in hazardous areas: Additional documentation such as Safety
Instructions (XA, ZD)
3.5 CE mark, Declaration of Conformity
The devices are designed to meet state-of-the-art safety requirements, have been tested and
left the factory in a condition in which they are safe to operate. The devices comply with the
applicable standards and regulations as listed in the EC Declaration of Conformity and thus
comply with the legal requirements of the EC Directives. Endress+Hauser confirms the
conformity of the device by affixing to it the CE mark.

Waterpilot FMX21 Mounting
Endress+Hauser 9
4Mounting
4.1 Mounting requierements
A0018770
Installation examples, here illustrated with FMX21 with an outer diameter of 22 mm (0.87 in), Accessories
ä 52
1 Extension cable mounting screw (can be ordered as an accessory)
2 Terminal box (can be ordered as an accessory)
3 Extension cable bending radius > 120 mm (4.72 in)
4 Mounting clamp (can be ordered as an accessory)
5Extensioncable
6Guidepipe
7 Waterpilot FMX21
8 Additional weight can be ordered as an accessory for FMX21 with an outer diameter of 22 mm (0.87 in) and 29 mm (1.14 in)
9 Protection cap
4.1.1 Additional mounting instruction
•Cablelength
– Customer-specific length in meters or feet.
– Limited cable length when performing installation with freely suspended device with
extension 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) bigger than the outer
diameter of the selected FMX21.
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 IICT6-T4
£
-10°C Ta70°C
£Ta40°Cfor T6
£
Ta70°Cfor T4
£
Ui30VDC; Ii133mA ; Pi 1W
£££
II2G
Ci=5nF + 180pF/m; Li= 1µH/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
TÜV01ATEX 1685
PPS/Polyolefin AL2O3 FEP EPDM
OPEN
CLOSE
90°
90°
Warning:
Avoid electrostatic charge in explosive atmosphere.
See instructions
TerminalBox for FMX21

Mounting Waterpilot FMX21
10 Endress+Hauser
• The device is provided with a protection cap to prevent mechanical damage to the
measuring cell.
• The cable must end in a dry room or a suitable terminal box. The terminal box from
Endress+Hauser provides optimum humidity and climatic protection and is suitable for
outdoor installation.
• If the cable is shortened, the filter at the pressure compensation tube has to be reattached
(ä54 "Cable shortening kit").
• Endress+Hauser recommends using twisted, shielded cables.
4.1.2 Dimensions
For dimensions, please refer to Technical Information TI00431P/00/EN, "Mechanical
construction" section (see also: www.endress.com Select Country Download 
Media Type: Documentation).
4.2 Mounting the Waterpilot with a mounting clamp
A0018793
1Extensioncable
2Mountingclamp
3 Clamping jaws
4.2.1 Mounting the mounting clamp:
Mount the mounting clamp (item 2). When selecting the place to fix the unit, take the
weight of the extension cable (item 1) and the device into account.
Raise the clamping jaws (item 3). Position the extension cable (item 1) between the
clamping jaws as illustrated in the graphic.
Hold the extension cable in position (item 1) and push the clamping jaws (item 3) back
down. Tap the clamping jaws gently from above to fix in place.
1
2
3

Waterpilot FMX21 Mounting
Endress+Hauser 11
4.3 Mounting with an extension cable mounting screw
A0018794
Illustrated with thread G 1½". Dimensions in mm (in)
1Extensioncable
2 Cover mounting screw
3 Sealing ring
4 Clamping sleeves
5 Mounting screw adapter
6 Top edge of clamping sleeve
7 Required length of extension cable and Waterpilot probe before 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, place the top edge of the
clamping sleeve 40 mm (1.57 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.
4.3.1 Mounting extension cable mounting screw with G 1½" or
NPT 1½" thread:
Mark the desired length of the extension cable on the extension cable, see additional
information on this page.
Insert the probe through the measuring aperture and carefully lower on the extension
cable. Fix the extension cable to prevent it from slipping.
Push the adapter (item 5) over the extension cable and screw it tightly into the
measuring aperture.
Push the sealing ring (item 3) and cover (item 2) onto the cable from above. Press the
sealing ring into the cover.
Place the clamping sleeve (item 4) around the extension cable (item 1) at the mark
(item 1) in accordance with step 1.
Push the extension cable with the clamping sleeve (item 4) into the adapter (item 5).
Push the cover (item 2) and sealing ring (item 3) onto the adapter (item 5) and screw
tightly to the adapter.
Reverse the sequence of steps to remove the extension cable mounting screw.
CAUTION
!
Risk of injury
‣Application in unpressurized containers only.
+40
()
+1.57
1
6
8
7
2
3
4
5
36
41

Mounting Waterpilot FMX21
12 Endress+Hauser
4.4 Mounting the terminal box
The optional terminal box is mounted with four screws (M4). For the dimensions of the
terminal box, please refer to Technical Information TI00431P/00/EN, "Mechanical
construction" section (see also: www.endress.com Select Country Download 
Media Type: Documentation).
4.5 Mounting the TMT182 temperature head transmitter
A0018813
Temperature head transmitter with terminal box
1Mountingscrews
2 Mounting springs
3 TMT182 temperature head transmitter
4 Circlips
5Terminalbox
Only open the terminal box with a screwdriver.
WARNING
!
Explosion hazard!
‣The TMT182 is not designed for use in hazardous areas.
4.5.1 Mounting the temperature head transmitter:
Guide the mounting screws (item 1) with the mounting springs (item 2) through the
guide holes of the temperature head transmitter (item 3).
Fix 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.
Screw the temperature head transmitter into the field housing tightly.
(Max. width of screwdriver blade 6 mm (0.24 in))
NOTICE
Prevent damage to the temperature head transmitter.
‣Do not tighten the mounting screw too tightly.
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
34
5

Waterpilot FMX21 Mounting
Endress+Hauser 13
A0018696
NOTICE
A minimum distance of > 7 mm (> 0.28 in) must be maintained between the terminal
strip and the TMT182 temperature head transmitter.
4.6 Mounting the terminal strip for the Pt100 passive
(without TMT182)
If the FMX21 with optional Pt100 is supplied without the optional TMT182 temperature
head transmitter, the terminal box is accompanied by a terminal strip for wiring the Pt100.
WARNING
!
Explosion hazard!
‣The Pt100 and the terminal strip are not designed for use in hazardous areas.
A0018815
4.7 Post-mounting check
Check that all screws are firmly seated.
>7 (0.28)
mm (in)

Electrical connection Waterpilot FMX21
14 Endress+Hauser
5 Electrical connection
5.1 Connecting the device
WARNING
!
Explosion hazard!
‣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.
• The supply voltage must match the supply voltage on the nameplate (ä6).
• Switch off the supply voltage before connecting the device.
• The cable must end in a dry room or a suitable terminal box. The IP66/IP67 terminal box
with a GORE-TEX®from Endress+Hauser is suitable for outdoor installation (ä12).
• Connect the device in accordance with the following diagrams. Reverse polarity protection
is integrated in the Waterpilot FMX21 and the TMT182 temperature head transmitter.
Changing the polarities will not result in the destruction of the devices.
• A suitable circuit breaker should be provided for the device in accordance with IEC/EN
61010.
A0019441
A Waterpilot FMX21
B Waterpilot FMX21 with Pt100

, version" NB" for feature 610 "Accessories" in the order code
a Not for FMX21 with an outer diameter of 29 mm (1.14 in)
b 10.5 to 30 V DC (Ex), 10.5 to 35 V DC
c 4 to 20 mA
d Resistance (RL)
e Pt100
 Not for use in hazardous areas.
RD BK RD BK
WH
YE BU
BR
a
AB
e
))
))
cc
dd
bb
a
FMX21
FMX21

Waterpilot FMX21 Electrical connection
Endress+Hauser 15
A0018780
Waterpilot FMX21 with Pt100 and TMT182 temperature head transmitter

, versions "NB" und "PT", feature 610 and 620 in the order
code (see also
 Technical Information TI00431P/00/EN, "Ordering information" section)
a Not for FMX21 with an outer diameter of 29 mm (1.14 in)
b 10.5 to 35 V DC
c 4 to 20 mA
d Resistance (RL)
e TMT182 temperature head transmitter (4 to 20 mA HART)
f 11.5 to 35 V DC
g Pt100
 Not for use in hazardous areas.
Wire colors
RD = red, BK = black, WH = white, YE = yellow, BU = blue, BR = brown
5.1.1 Connection data
Connection classification as per IEC 61010-1:
• Overvoltage category 1
• Pollution degree 1
Connection data in the hazardous area
)
)
a
b
c
e
f
d
cd
g
RD BK
WH
YE BU
BR
6
5
4
32
1
FMX21
4 to 20 mA Ex ia IIC T4 to T6
Ui 30 V DC
Ii 133 mA
Pi 1.0 W
Ci 10.3 nF (sensor); 180 pF/m (cable)
Li 0 μH (sensor); 1 μH/m (cable)
Ta –10 °C (+14 °F) Ta +70 °C (+158 °F) for T4
–10 °C (+14 °F) Ta +40 °C (+104 °F) for T6

Electrical connection Waterpilot FMX21
16 Endress+Hauser
5.1.2 Supply voltage
When the device is used in hazardous areas, the supply voltage is restricted as above
in accordance with the requirements of the certificate in question.
5.1.3 Cable specification
• FMX21 with optional Pt100
– Commercially available, shielded instrument cable
– Terminals, terminal box: 0.08 to 2.5 mm2(28 to 14 AWG)
• TMT182 temperature head transmitter (optional)
– Commercially available instrument cable
– Terminals, terminal box: 0.08 to 2.5 mm2(28 to 14 AWG)
– Transmitter terminals: max. 1.75 mm2(16 AWG)
The extension cables are shielded for versions with outer diameters of 22 mm (0.87 in)
or 42 mm (1.65 in).
In the following cases, Endress+Hauser recommends the use of a shielded cable as the cable
extension:
• For large distances between the end of the extension cable and the display and/or
evaluation unit.
• For large distances between the end of the extension cable and the temperature head
transmitter.
• When directly connecting the Pt100 signal to a display and/or evaluation unit.
5.1.4 Power consumption, current consumption
Version FMX21 FMX21 + Pt100 TMT182 temperature
head transmitter
Version for the non-hazardous area 10.5 to 35 V DC 10.5 to 35 V DC 11.5 to 35 V DC
Version for the hazardous area 10.5 to 30 V DC – –
FMX21 FMX21 + Pt100 TMT182 temperature
head transmitter
Power consumption 0.805 W at 35 V DC
(non-hazardous area)
0.690 W at 30 V DC
(hazardous area)
0.805 W at 35 V DC 0.805 W at 35 V DC
Current consumption Max. 23 mA
Min. 3.6 mA
Max. 23 mA
Min. 3.6 mA
Pt100: 0.6 mA
Max. 23 mA
Min. 3.5 mA

Waterpilot FMX21 Electrical connection
Endress+Hauser 17
5.1.5 Load
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.
When operating using a HART handheld terminal or a PC with an operating program,
a minimum communication resistance of 250 has to be taken into account.
FMX21 Temperature head transmitter
A0018753-EN A0018754-EN
RLmax –20.09
••L–R
U–10.5V
23 mA
W
m
£add
–R
U– 11.5 V
0.023 A
£
RLmax add
RLmax = Max. load resistance [  ]
Radd = Additional resistances such as resistance of evaluation unit and/or display unit, cable resistance [  ]
U = Supply voltage [V]
L=Simple length of extension cable [m] (cable resistance per wire  0.09  m)
A0018765
FMX21 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.
A0018766
Temperature head transmitter load chart for estimating the
load resistance. Additional resistances have to be subtracted
from the value calculated as shown in the equation.
413
630
195
1065
35
20 25
10.515
847
30
R
[]W
U
[ ]
V
370
587
152
1022
35
20 25
11.515
804
30
R
[]W
U
[ ]
V

Electrical connection Waterpilot FMX21
18 Endress+Hauser
5.2 Connecting the measuring unit
5.2.1 Overvoltage protection
To protect the Waterpilot and the TMT182 temperature head transmitter from large
interference voltage peaks, Endress+Hauser recommends installing overvoltage protection
upstream and downstream of the display and/or evaluation unit as shown in the graphic.
A0018941
A Power supply, display and evaluation unit with one input for Pt100
B Power supply, display and evaluation unit with one input for 4 to 20 mA
C Power supply, display and evaluation unit with two inputs for 4 to 20 mA
1 Waterpilot FMX21 HART
2 Connection for integrated Pt100 temperature sensor in the FMX21 HART
3 4 to 20 mA HART(Temperature)
4 4 to 20 mA HART(Level)
5 Overvoltage protection (OP), e.g. HAW from Endress+Hauser (not for use in hazardous areas)
6 Power supply
Further information on the TMT182 temperature head transmitter for HART
applications from Endress+Hauser can be found in "Technical Information" TI00078R/
09/EN.
1
3
4
3
4
5
5
5
5
5
5
5
6
6
6
2
A
B
B
C
2

Waterpilot FMX21 Electrical connection
Endress+Hauser 19
5.2.2 Connecting Commubox FXA195
The Commubox FXA195 connects intrinsically safe transmitters with the HART protocol to
a computer's USB port. This allows remote operation of the transmitter using
Endress+Hauser's FieldCare operating program. Power is supplied to the Commubox
through the USB port. The Commubox is also suitable for connection to intrinsically safe
circuits. See Technical Information TI00404F/00/EN for further information.
5.2.3 Connecting Field Xpert SFX
Compact, flexible and robust industry handheld terminal for remote configuration and for
obtaining measured values via the HART current output (4 to 20 mA). For details, see
Operating Instructions BA00060S/04/EN.
A0018811
1 Waterpilot FMX21
2 Necessary communication resistor
 250 
3 Computer with operating tool (e.g. FieldCare)
4 Commubox FXA195 (USB)
5 Transmitter power supply unit, e.g. RN221N (with communication resistor)
6 Field Xpert SFX
7 VIATOR Bluetooth-Modem with cable connection
Only use certified operating devices in hazardous area!
WARNING
!
Explosion hazard!
‣Do not change the battery of the handheld terminal in the hazardous area.
‣When using the measuring device in hazardous areas, installation must comply with the
applicable national standards and regulations and the Safety Instructions (XAs) or the
Installation or Control Drawings (ZDs).
3
76
4
1
5
2

Electrical connection Waterpilot FMX21
20 Endress+Hauser
5.2.4 Connecting for air pressure compensation with external
measured value
A0018757
1 Fieldgate FXA520
2 Multidrop-Connector FXN520
3Cerabar
4 Waterpilot FMX21
It is advisable to use an absolute pressure probe for applications in which condensation can
occur. In the case of level measurement with an absolute pressure probe, the measured value
is affected by fluctuations in the ambient air pressure. To correct the resulting measured
error, you can connect an external absolute pressure sensor (e.g. Cerabar) to the HART
signal cable, switch the waterpilot to the burst mode and the Cerabar to operate in mode
"Electr. Delta P".
By switching on the application "Electr. Delta P", the external absolute pressure sensor
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 (ä39).
If using intrinsically safe devices, strict compliance with the rules for interconnecting
intrinsically safe circuits as stipulated in IEC60079-14 (proof of intrinsic safety) is
mandatory.
5.2.5 Connecting external temperature sensor/temperature head
transmitter for density compensation
The Waterpilot FMX21 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 for
density compensation. The level signal is thus corrected according to the density
characteristic line of the water (ä41).
Use the optional internal Pt100 temperature sensor for density compensation in a sui-
table HART master (e.g. PLC)
The Waterpilot FMX21 is available with an optional Pt100 temperature sensor.
Endress+Hauser additionally offers the TMT182 temperature head transmitter to convert
the Pt100 signal to a 4 to 20 mA HART signal.
The temperature and pressure signal is transmitted to the HART master (e.g. PLC) where a
corrected level value can be generated using a stored linearization table or the density
function (of a chosen medium) ä42.
FXN520
1234