Endress+Hauser iTEMP TMT85 User manual

Products Solutions Services
BA00251R/09/EN/14.13
71209223
Device software
02.00
Operating instructions
iTEMP®TMT85
Temperature head transmitter
with FOUNDATION Fieldbus™- protocol
9

Endress+Hauser
Brief overview
For quick and easy commissioning:
Safety instructions →Page 4
Æ
Installation instructions →Page 8
Æ
Wiring →Page 13
Æ
Display and operating elements →Page 22
Information on configuration and operating programs from other
manufacturers.
Information about setting the hardware write protection, device
address, etc. for FOUNDATION Fieldbus communication
Æ
Commissioning →Page 27
Commissioning via the FOUNDATION Fieldbus interface - quick start
for device configuration for standard operation
Customer-specific configuration →Page 52
Complex measurement tasks require additional functions to be
configured that the user can individually select, set and adapt to his
process conditions by setting the appropriate parameters.
A detailed description of all the functions and device parameters.

TMT85
Endress+Hauser 3
Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning, operation . . . . . . . . . 4
1.3 Operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Notes on safety conventions and icons . . . . . . . . . 5
2 Identification . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Device designation . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Certificates and approvals . . . . . . . . . . . . . . . . . . . . 6
2.4 Registered trademarks . . . . . . . . . . . . . . . . . . . . . . . 7
3 Installation instructions . . . . . . . . . . . . . 8
3.1 Incoming acceptance, transport, storage . . . . . . . . 8
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Installation instructions . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Post-installation check . . . . . . . . . . . . . . . . . . . . . 12
4 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Quick wiring guide . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Connecting the sensor cables . . . . . . . . . . . . . . . 14
4.3 FOUNDATION Fieldbus™ cable specification . . 15
4.4 Connecting the measuring unit . . . . . . . . . . . . . . 18
4.5 Post-connection check . . . . . . . . . . . . . . . . . . . . . 20
5 Operation. . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1 Quick operation guide . . . . . . . . . . . . . . . . . . . . . 21
5.2 Display and operating elements . . . . . . . . . . . . . 22
5.3 FOUNDATION Fieldbus™ technology . . . . . . . . . 22
5.4 Configuration of the transmitter and FF functions
26
5.5 Hardware settings (optional) . . . . . . . . . . . . . . . . 26
6 Commissioning. . . . . . . . . . . . . . . . . . . .27
6.1 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.2 Switching on the measuring device . . . . . . . . . . 27
6.3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7 Maintenance. . . . . . . . . . . . . . . . . . . . . .33
8 Accessories . . . . . . . . . . . . . . . . . . . . . . . 33
9 Troubleshooting. . . . . . . . . . . . . . . . . . . 34
9.1 Troubleshooting instructions . . . . . . . . . . . . . . . . 34
9.2 Status messages . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.3 Application errors without messages . . . . . . . . . 40
9.4 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.5 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.7 Software history and overview of compatibility 42
10 Technical Data . . . . . . . . . . . . . . . . . . . . 43
11 Operation via FOUNDATION Fieldbus™ .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Safety instructions TMT85
4Endress+Hauser
1 Safety instructions
1.1 Designated use
• The device is a universal and configurable temperature head transmitter for resistance
thermometers (RTD), thermocouples (TC) and resistance and voltage transmitters. The
device is designed for installation in a connection head form B according to DIN EN50446.
• The manufacturer cannot be held responsible for damage caused by misuse of the unit.
1.2 Installation, commissioning, operation
Please note the following:
• The device may only be installed, connected, commissioned and maintained by properly
qualified and authorized staff (e.g. electrical technicians) in strict compliance with these
Operating Instructions, applicable standards, legal regulations and certificates (depending
on the application).
• The specialist staff must have read and understood these Operating Instructions and must
follow the instructions they contain.
• The installer must ensure that the measuring system is correctly connected in accordance
with the electrical wiring diagrams.
• Damaged devices which could constitute a source of danger must not be put into operation
and must be clearly indicated as defective.
• Invariably, local regulations governing the opening and repair of electrical devices apply.
1.3 Operational safety
Please pay particular attention to the technical data on the nameplate! The nameplate is
located on the side of the transmitter housing.
Hazardous area
When using in hazardous areas, the national safety requirements must be met. Separate Ex
documentation is contained in these Operating Instructions for measurement systems that
are to mounted in hazardous areas. Strict compliance with the installation instructions,
ratings and safety instructions as listed in this supplementary documentation is mandatory.
The documentation number of that document (XA...) is also indicated on the nameplate.
Electromagnetic compatibility
The measuring device meets the general safety requirements of EN 61010 and the EMC
requirements of IEC/EN 61326 as well as NAMUR recommendations NE 21 and NE 89.
NOTICE
Power supply
‣Power must be fed to the device from an 9 to 32 VDC power supply in accordance with
NEC Class 02 (low voltage/current) with short-circuit power limit to 8 A/150 VA.

TMT85 Safety instructions
Endress+Hauser 5
1.4 Notes on safety conventions and icons
Always refer to the safety instructions in these Operating Instructions labeled with the
following symbols:
Symbol Meaning
A0011190-EN
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation
can result in serious or fatal injury.
A0011191-EN
CAUTION!
This symbol alerts you to a dangerous situation. Failure to avoid this situation
can result in minor or medium injury.
A0011192-EN
NOTICE!
This symbol contains information on procedures and other facts which do not
result in personal injury.
ESD - Electrostatic discharge
Protect the terminals against electrostatic discharge. Failure to comply with
this instruction can result in the destruction of parts or malffunction of the
electronics.
A0011193
Indicates additional information, Tip

Identification TMT85
6Endress+Hauser
2 Identification
2.1 Device designation
2.1.1 Nameplate
The right device?
Compare the nameplate on the device with the following graphic:
A0008278
Fig. 1: Nameplate of the head transmitter (example)
1 Device identification number (Device_ID)
2 Power supply and extended order code
3 Serial number and FW release
4 Approvals with symbols
52Dbarcode
6Tagname(TAG)
7 Approval in hazardous area with number of the relevant Ex documentation (XA...)
8Ordercode
2.2 Scope of delivery
The scope of delivery of the device comprises:
• Temperature head transmitter
•Securingmaterial
• Multi-language hard copy of Brief Operating Instructions
• Operating Instructions and additional documentation on CD-ROM
• Additional documentation for devices that are suitable for use in hazardous areas (0
2 1), such as Safety Instructions (XA...), Control or Installation Drawings (ZD...).
2.3 Certificates and approvals
The 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. The device complies with the standards EN 61 010-1 "Protection Measures for
Electrical Equipment for Measurement, Control, Regulation and Laboratory Procedures" and
with the EMC requirements of IEC/EN 61326.
2.3.1 CE mark, declaration of conformity
The device described in these Operating Instructions is therefore in conformity with the
statutory requirements of the EU Directives. The manufacturer confirms a positive
completion of all tests by fitting the unit with a CE mark.

TMT85 Identification
Endress+Hauser 7
2.3.2 Certification Foundation Fieldbus™
The temperature transmitter has successfully passed all the tests and is certified and
registered by the Fieldbus Foundation. The device meets all the requirements of the
following specifications:
• Certified in accordance with FOUNDATION Fieldbus™ specification
• FOUNDATION Fieldbus™ H1
• Interoperability Test Kit (ITK), (device certification number available on request): the
device may also be operated using certified devices from other manufacturers
• Physical Layer Conformance Test of the Fieldbus FOUNDATION™
An overview of additional approvals and certifications can be found on →ä50.
2.4 Registered trademarks
FOUNDATION FieldbusTM
Registered trademark of the Fieldbus Foundation Austin, Texas, USA

Installation instructions TMT85
8Endress+Hauser
3 Installation instructions
3.1 Incoming acceptance, transport, storage
3.1.1 Incoming acceptance
On receipt of the goods, check the following points:
• Are the contents or the packaging damaged?
• Is the delivery complete and is anything missing? Check the scope of delivery against you
order.
3.1.2 Transport and storage
Note the following points:
• Pack the device in such a way as to protect it reliably against impact for storage (and
transportation). The original packaging provides optimum protection.
• The permitted storage temperature is -40 to +100 °C (-40 to 212 °F).
3.2 Installation conditions
3.2.1 Dimensions
The dimensions of the device can be found in chapter 10 ''Technical data''.
3.2.2 Installation point
• In the terminal head, flat face, as per DIN EN50446, direct mounting on insert with cable
entry (middle hole 7 mm)
• In the field housing, separate from the process (see Section 8 'Accessories')
• Mounting on a DIN rail as per EN 60715 is also possible with the DIN rail clip accessory,
see Section 8 'Accessories'.
Information on installation conditions, such as ambient temperature, protection
classification, climatic class etc., can be found in chapter 10 "Technical data".
When using in the hazardous area, the limit values of the certificates and approvals must be
observed (see Safety Instructions XA or CD).
3.3 Installation instructions
A screwdriver is needed to mount the head transmitter.
NOTICE
Damage of the head transmitter
‣Do not overtighten the mounting screws as this could damage the head transmitter.
Maximum torque = 1 Nm (¾ pound-feet).

TMT85 Installation instructions
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3.3.1 Mounting typical of Europe
A0008281-EN
Fig. 2: Head transmitter mounting (three versions)
Item A Mounting in a terminal head (terminal head as per DIN EN50446, flat face)
1Terminalhead
2 Circlips
3Insert
4 Connection wires
5 Head transmitter
6 Mounting springs
7Mountingscrews
8 Terminal head cover
9Cableentry
Procedure:
1. Open the terminal head cover (8).
2. Guide the connection wires (4) of the insert (3) through the middle hole in the head transmitter (5).
3. Fit the mounting springs (6) onto the mounting screws (7).
4. Guide the mounting screws (7) through the lateral bores of the head transmitter and the insert (3). Then fix
both mounting screws in position with the circlips (2).
5. Then screw down the head transmitter (5) to the insert (3) in the terminal head.
6. After wiring (see section 4), close the terminal head cover (8) back on tight.

Installation instructions TMT85
10 Endress+Hauser
3.3.2 Mounting typical of North America
A0008520
Fig. 3: Head transmitter mounting
1: Thermowell
2: Insert
3: Adapter, threaded joint
4: Terminal head
5: Head transmitter
6: Mounting screws
Item B Mounting in a field housing
1 Field housing cover
2 Mounting screws with springs
3 Head transmitter
4 Field housing
Procedure:
1. Open the cover (1) of the field housing (4).
2. Guide the mounting screws (2) through the lateral bores of the head transmitter (3).
3. Screw the head transmitter to the field housing.
4. When wiring is complete (see section 4), screw the field housing cover (1) back on.
Item C Mounting on DIN rail as per IEC 60715
1 Mounting screws with springs
2 Head transmitter
3 Circlips
4DINrailclip
5DINrail
Procedure:
1. Press the DIN rail clip (4) onto the DIN rail (5) until it engages.
2. Fit the mounting springs onto the mounting screws (1) and guide them through the lateral bores of the head
transmitter (2). Then fix both mounting screws in position with the circlips (3).
3. Screw the head transmitter (2) to the DIN rail clip (4).
1234 5
6
5
6

TMT85 Installation instructions
Endress+Hauser 11
Thermometer design with thermocouples or RTD sensors and head transmitter
(→å3)
• Fit the thermowell (item 1) on the process pipe or the container wall. Secure the
thermowell according to the instructions before the process pressure is applied.
• Fit the necessary neck tube nipples and adapter (item 3) on the thermowell.
• Make sure sealing rings are installed if such rings are needed for harsh environmental
conditions or special regulations.
• Guide the mounting screws (item 6) through the lateral bores of the head transmitter
(item 7).
• Position the head transmitter (item 5) in the terminal head (item 4) in such a way that the
bus cable (terminals 1 and 2) point to the cable entry.
• Using a screwdriver, screw down the head transmitter (item 5) in the terminal head (item
4).
• Guide the connection wires of the insert (item 3) through the lower cable entry of the
terminal head (item 4) and through the middle hole in the head transmitter (item 5). Wire
the connection wires and transmitter (see Section 4) with one another.
• Screw the terminal head (item 4), with the integrated and wired head transmitter, onto
the ready-mounted nipple and adapter (item 3).
NOTICE
Requirements for explosion protection
‣Once the wiring is completed, screw the terminal head cover back on. The terminal head
cover must be secured properly.
3.3.3 Mounting the display
1. Remove the screw from the terminal head. Open the terminal head cap (1).
2. Remove the cover of the display connection (2). Plug the display module onto the
mounted and wired head transmitter. The mounting pins (3) must snap securely into
the head transmitter.
3. After mounting the display, close the terminal head cap and refit the screw.
A0009852
Fig. 4: Mounting the display
The display can only used with the suitable Endress+Hauser terminal heads TA30
and caps with display window.

Installation instructions TMT85
12 Endress+Hauser
3.4 Post-installation check
After installing the device, always run the following final checks:
Device condition and specifications Notes
Is the device visibly damaged (visual check)? -
Does the device comply to the measurement point specifications, such as
ambient temperature, measurement range etc.?
See chapter 10 "Technical data"

TMT85 Wiring
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4 Wiring
NOTICE
Electronic parts may be damaged
‣Switch off power supply before installing or connecting the device. Failure to observe this
may result in destruction of parts of the electronics.
‣When installing Ex-approved devices in a hazardous area please take special note of the
instructions and connection schematics in the respective Ex documentation added to
these Operating Instructions. The local E+H representative is available for assistance if
required.
‣The 4-pin post connector is only designed for connecting the associated display.
Connecting other devices can destroy parts of the electronics.
For wiring a mounted head transmitter, proceed as follows:
1. Open the cable gland and the housing cover on the terminal head or the field housing.
2. Feed the cables through the opening in the cable gland.
3. Connect the cables as shown in →å5. If the head transmitter is fitted with spring
terminals, please pay particular attention to →Chap. 4.2.1.
4. Retighten the cable gland and close the housing cover.
5. In order to avoid connection errors always take note of the hints given in the section
connection check!
4.1 Quick wiring guide
Terminal assignment
A0007285-EN
Fig. 5: Wiring the head transmitter
ESD - electrostatic discharge
Protect the terminals from electrostatic discharge. Failure to observe this may result in
destruction or malfunction of parts of the electronics.
-
+
+
1
-
2
7
6
5
4
3
1
2
7
6
5
4
3
Sensor input 2 Sensor input 1 Bus connection
and supply voltage
Display connection/
service interface
TC, mV
RTD, 4-, 3- and 2-wire:Ω
RTD, 3- and 2-wire:Ω
TC, mV
white
red
red
white
white
red
red
(black)
(yellow)
(black)

Wiring TMT85
14 Endress+Hauser
4.2 Connecting the sensor cables
Please refer to →å5 for the terminal assignment of the sensor connections.
The following connection combinations are possible when both sensor inputs are assigned:
4.2.1 Connecting to spring terminals
A0008322
Fig. 6: Spring terminal connection
A Insert wire end (solid wire or wire with ferrule)
B Insert wire end (fine-strand wire without ferrule)
C Release wire end with tool
D Remove wire end
When connecting 2 sensors ensure that there is no galvanic connection between the
sensors (e.g. caused by sensor elements that are not isolated from the thermowell).
The resulting equalizing currents distort the measurements considerably. In this
situation, the sensors have to be galvanically isolated from one another by connec-
ting each sensor separately to a transmitter. The device provides sufficient galvanic
isolation (> 2 kV AC) between the input and output.
Sensor input 1
RTD or
resistance
transmitter,
two-wire
RTD or
resistance
transmitter,
three-wire
RTD or
resistance
transmitter,
four-wire
Thermocouple
(TC), voltage
transmitter
Sensor
input 2
RTD or resistance
transmitter, two-wire   -Â
RTD or resistance
transmitter, three-
wire
  -Â
RTD or resistance
transmitter, four-wire ----
Thermocouple (TC),
voltage transmitter    Â
ABCD
When connecting flexible cables and spring terminals, it is not recommended to use ferrules.

TMT85 Wiring
Endress+Hauser 15
Procedure:
4.3 FOUNDATION Fieldbus™ cable specification
4.3.1 Cable type
Twin-core cables are required for connecting the device to the FOUNDATION Fieldbus™ H1.
Following IEC 61158-2 (MBP), four different cable types (A, B, C, D) can be used with the
FOUNDATION Fieldbus™, only two of which (cable types A and B) are shielded.
• Cable types A or B are particularly preferable for new installations. Only these types have
cable shielding that guarantees adequate protection from electromagnetic interference
and thus the most reliable data transfer. In the case of cable type B, several field buses
(same degree of protection) may be operated in one cable. No other circuits are permissible
in the same cable.
• Practical experience has shown that cable types C and D should not be used due to the lack
of shielding, since the freedom from interference generally does not meet the
requirements described in the standard.
The electrical data of the fieldbus cable have not been specified but determine important
characteristics of the design of the fieldbus, such as distances bridged, number of users,
electromagnetic compatibility, etc.
Item A, solid wire: 1. Strip wire end. Minimum stripping length = 10 mm (0.39 in)
2. Insert the wire end into the terminal (A).
3. Check the connection by pulling on the wire lightly. Repeat from
step 1 if necessary.
Item B, fine-strand wire without ferrule:1. Strip wire end. Minimum stripping length = 10 mm (0.39 in)
2. Operate lever opener with tool (B).
3. Insert the wire end into the terminal (B).
4. Release lever opener.
5. Check the connection by pulling on the wire lightly. Repeat from
step 1 if necessary.
Item C and D, releasing the connection: 1. Operate lever opener with tool (C).
2. Remove wire from terminal (D).
3. Release lever opener.
Type A Type B
Cable structure Twisted pair, shielded One or more twisted pairs, fully
shielded
Wire size 0.8 mm2(AWG 18) 0.32 mm2 (AWG 22)
Loop-resistance (direct current) 44 Ω/km 112 Ω/km
Characteristic impedance at
31.25 kHz
100 Ω± 20% 100 Ω± 30%
Attenuation constant at 39 kHz 3 dB/km 5 dB/km
Capacitive asymmetry 2 nF/km 2 nF/km

Wiring TMT85
16 Endress+Hauser
Suitable fieldbus cables (type A) from various manufacturers for non-hazardous areas are
listed below:
• Siemens: 6XV1 830-5BH10
• Belden: 3076F
• Kerpen: CeL-PE/OSCR/PVC/FRLA FB-02YS(ST)YFL
4.3.2 Maximum overall cable length
The maximum network expansion depends on the type of protection and the cable
specifications. The overall cable length combines the length of the main cable and the length
of all spurs (>1 m/3.28 ft). Note the following points:
• The maximum permissible overall cable length depends on the cable type used.
• If repeaters are used, the maximum permissible cable length is doubled. A maximum of
three repeaters are permitted between user and master.
4.3.3 Maximum spur length
The line between the distribution box and field device is described as a spur.
In the case of non-Ex applications, the max. length of a spur depends on the number of spurs
(>1 m/3.28 ft):
4.3.4 Number of field devices
In accordance with IEC 61158-2 (MBP), a maximum of 32 field devices can be connected per
fieldbus segment. However, this number is restricted under certain conditions (explosion
protection, bus power option, field device current consumption). A maximum of four field
devices can be connected to a spur.
4.3.5 Shielding and grounding
Optimum electromagnetic compatibility (EMC) of the fieldbus system can only be
guaranteed if the system components and, in particular, the lines are shielded and the shield
forms as complete a cover as possible. A shield coverage of 90% is ideal.
• To ensure an EMC protective effect, connect the shield as often as possible to the reference
ground.
• For reasons of explosion protection, you should refrain from grounding however.
Envelope delay distortion (7.9 to
39 kHz)
1.7 ms/km *
Shield coverage 90% *
Max. cable length (incl. spurs >1
m)
1900 m (6233 ft) 1200 m (3937 ft)
* Not specified
Number of spurs 1 to 12 13 to 14 15 to 18 19 to 24 25 to 32
Max. length per spur 120 m (393
ft)
90 m (295
ft)
60 m (196
ft)
30 m (98 ft) 1 m (3.28 ft)
Type A Type B

TMT85 Wiring
Endress+Hauser 17
To comply with both requirements, the FOUNDATION Fieldbus™ basically allows three
different types of shielding:
• Shielding at both ends
• Shielding at one end on the feed side with capacitance connection to the field device
• Shielding at one end on the feed side
Experience shows that the best results with regard to EMC are achieved in most cases in
installations with one-sided shielding. Appropriate measures with regard to input wiring
must be taken to allow unrestricted operation when EMC interference is present. These
measures have been taken into account for this device. Operation in the event of disturbance
variables as per NAMUR NE21 is possible with one-sided shielding.
Where applicable, national installation regulations and guidelines must be observed during
the installation!
Where there are large differences in potential between the individual grounding points, only
one point of the shielding is connected directly with the reference ground. In systems
without potential equalization, therefore, cable shielding of fieldbus systems should only be
grounded on one side, for example at the fieldbus supply unit or at safety barriers, →å7
A0008770
Fig. 7: Shielding and one-sided grounding of the fieldbus cable shielding
1 Supply unit
2 Distribution box (T-box)
3Busterminator
4 Grounding point for fieldbus cable shielding
5 Optional grounding of the field device, isolated from cable shielding.
NOTICE
If the shielding of the cable is grounded at more than one point in systems without
potential matching, power supply frequency equalizing currents can occur that damage
the bus cable or shielding or have serious effect on signal transmission.
‣In such cases the shielding of the fieldbus cable is to be grounded on only one side, i.e. it
must not be connected to the ground terminal of the housing (terminal head, field
housing). The shield that is not connected should be insulated!
4.3.6 Bus termination
The start and end of each fieldbus segment are always to be terminated with a bus
terminator. With various junction boxes (non-Ex), the bus termination can be activated via
a switch. If this is not the case, a separate bus terminator must be installed. Note the
following points in addition:
• In the case of a branched bus segment, the device furthest from the segment coupler
represents the end of the bus.
• If the fieldbus is extended with a repeater, then the extension must also be terminated at
both ends.

Wiring TMT85
18 Endress+Hauser
4.3.7 Further information
General information and further pointers on wiring can be found on www.fieldbus.org, the
Web site of the Fieldbus Foundation or in the Operating Instructions "FOUNDATION
Fieldbus™ Overview" which can also be found on the CD-ROM. (Additional sources: →
www.endress.de →Download).
4.4 Connecting the measuring unit
Devices can be connected to the FOUNDATION Fieldbus™ in two ways:
• Connection via conventional cable gland →Chap. 4.4.1
• Connection via fieldbus connector (optional, can be purchased as an accessory)
→Chap. 4.4.2
NOTICE
Risk of damaging
‣Switch off power supply before installing or connecting the head transmitter. Failure to
observe this may result in destruction of parts of the electronics.
‣Grounding via one of the grounding screws (terminal head, field housing) is
recommended.
‣If the shielding of the fieldbus cable is grounded at more than one point in systems
without additional potential matching, power supply frequency equalizing currents can
occur that damage the cable or the shielding. In such cases the shielding of the fieldbus
cable is to be grounded on only one side, i.e. it must not be connected to the ground
terminal of the housing (terminal head, field housing). The shield that is not connected
should be insulated!
‣We recommend that the fieldbus not be looped using conventional cable glands. If you
later replace even just one measuring device, the bus communication will have to be
interrupted.
4.4.1 Cable glands or entries
Please also observe the general procedure on →ä13.
A0008284
Fig. 8: Connection to the FOUNDATION Fieldbus™ fieldbus cable - installed in the field housing on the left, and in the terminal
head on the right
1 FF terminals - fieldbus communication and power supply
2 Inner ground terminal
3Outergroundterminal
4 Shielded fieldbus cable (FOUNDATION Fieldbus™)
• The terminals for the fieldbus connection (1+ and 2-) are not polarity sensitive.
• Conductor cross-section:
max. 2.5 mm2for screw terminals
max. 1.5 mm2for spring terminals
• A shielded cable must be used for the connection.

TMT85 Wiring
Endress+Hauser 19
4.4.2 Fieldbus connector
Optionally, a fieldbus connector can be screwed into the terminal head or field housing
instead of a cable gland. Fieldbus connectors can be ordered from Endress+Hauser as an
accessory (see Section 8 'Accessories').
The connection technology of FOUNDATION Fieldbus™ allows measuring devices to be
connected to the fieldbus via uniform mechanical connections such as T-boxes, junction
boxes, etc.
This connection technology using prefabricated distribution modules and plug-in connectors
offers substantial advantages over conventional wiring:
• Field devices can be removed, replaced or added at any time during normal operation.
Communication is not interrupted.
• Installation and maintenance are significantly easier.
• Existing cable infrastructures can be used and expanded instantly, e.g. when constructing
new star distributors using 4-channel or 8-channel distribution modules.
A0008283
Fig. 9: Connectors for connecting to the FOUNDATION Fieldbus™
A Fieldbus connector (pin assignment/color codes)
– 1 Blue wire: FF– (terminal 2)
– 2 Brown wire: FF+ (terminal 1)
– 3 Gray wire: shielding
– 4 Green/yellow wire: ground
– 5 Positioning tappet
– 6 7/8" UNC thread
B Terminal head thermometer
C Connector at the housing (male)
Connector technical data:
190 mm (7.48 in)
26.5 mm
(1.040 in)
M20x1.5 /
NPT 1/2”
7/8-16 UNC
AB
4
1
2
C3
5
6
Wire cross-section 4 x 0.8 mm2
Connection thread M20 x 1.5 / NPT ½"
Degree of protection IP 67 as per DIN 40 050 IEC 529
Contact surface CuZn, gold-plated
Housing material 1.4401 (316)
Flammability V - 2 as per UL - 94
Ambient temperature –40 to +105 °C (–40 to +221 °F)
Current carrying capacity 9 A
Rated voltage max. 600 V
Contact resistance ≤5 mΩ
Insulation resistance ≥109Ω

Wiring TMT85
20 Endress+Hauser
4.5 Post-connection check
After the electrical installation of the device, always perform the following final checks:
Device condition and specifications Notes
Are the measuring device or the cables damaged (visual check)? -
Electrical connection Notes
Does the supply voltage match the specifications on the nameplate? 9 to 32 V DC
Do the cables used comply with the specifications? Fieldbus cable, →ä15
Sensor cable, →ä14
Do the cables have adequate strain relief? -
Are the power supply and signal cables correctly connected? →Chap. 4.1
Are all the screw terminals well tightened and have the connections of the
spring terminals been checked?
→ä14
Are all the cable entries installed, tightened and sealed?
Cable run with "water trap"?
Are all the housing covers installed and tightened?
Electrical connection of FOUNDATION Fieldbus™ Notes
Are all the connecting components (T-boxes, junction boxes, connectors,
etc.) connected with each other correctly?
-
Has each fieldbus segment been terminated at both ends with a bus
terminator?
-
Has the max. length of the fieldbus cable been observed in accordance with
the FOUNDATION Fieldbus™ specifications?
→ä15Has the max. length of the spurs been observed in accordance with the
FOUNDATION Fieldbus™ specifications?
Is the fieldbus cable fully shielded (90%) and correctly grounded?