Endress+Hauser Prothermo NMT81 User manual

Products Solutions Services
Operating Instructions
Prothermo NMT81
Tank Gauging
BA02094G/00/EN/01.21
71517024
2021-06-08
Valid as of version
01.00.00.zz (Device firmware)

Prothermo NMT81
2 Endress+Hauser
Order code:
Ext. ord. cd.:
Ser. no.:
www.endress.com/deviceviewer Endress+Hauser
Operations App
XXXXXXXXXXXX
XXXXX-XXXXXX
XXX.XXXX.XX
Serial number
1.
3.
2.
A0023555

Prothermo NMT81 Table of contents
Endress+Hauser 3
Table of contents
1 About this document ................ 5
1.1 Document function ..................... 5
1.2 Document conventions ................... 5
1.3 Documentation ........................ 7
1.4 Registered trademarks ................... 8
2 Basic safety instructions ............ 9
2.1 Requirements for the personnel ............ 9
2.2 Designated use ........................ 9
2.3 Workplace safety ....................... 9
2.4 Operational safety ...................... 9
2.5 Product safety ........................ 10
3 Product description ................ 11
3.1 Product design ........................ 11
4 Incoming acceptance and product
identification ..................... 12
4.1 Incoming acceptance ................... 12
4.2 Product identification .................. 12
4.3 Manufacturer contact address ............ 13
4.4 Storage and transport .................. 13
5 Installation ....................... 14
5.1 Converter ........................... 14
5.2 Option 1: Converter with universal coupling .. 14
5.3 Option 2: Converter with M20 mounting
thread .............................. 15
5.4 Converter + average temperature probe
version ............................. 16
5.5 Converter + average temperature probe +
water bottom probe .................... 17
5.6 Flanges ............................. 19
5.7 Element No. 1 position .................. 20
5.8 WB probe design ...................... 21
5.9 Pre-installation of NMT81 ............... 23
5.10 Installation procedure .................. 24
5.11 Mounting NMT81 on a cone roof tank ...... 27
5.12 Mounting NMT81 on a floating roof tank .... 32
5.13 Mounting NMT81 on a pressurized tank ..... 36
6 Electrical connection .............. 37
6.1 NMT81 (Ex ia) intrinsically safe connection .. 37
6.2 NMT81 transmitter and element connection .38
6.3 NMS8x/NMR8x/NRF81 (Ex d [ia])
intrinsically safe connection .............. 38
6.4 NMS5 (Ex d [ia]) intrinsically safe
connection .......................... 39
6.5 NRF590 terminals ..................... 40
6.6 Mechanical connection for converter-only
version ............................. 41
6.7 Wiring connection for converter-only
version ............................. 43
7 Operability ........................ 45
7.1 Overview of the operation options ......... 45
7.2 Structure and function of the operating
menu .............................. 45
7.3 Operation via HART master connecting with
devices ............................. 47
7.4 Display of NMT81 ..................... 47
7.5 Operating keys and DIP switches on the
electronic insert ....................... 48
7.6 Configuring NMT81 with NMS5/NMS7/
NRF590 ............................ 52
7.7 Configuring NMT81 with NMS8x/NMR8x/
NRF81 ............................. 52
7.8 Access to the operating menu via the
operating tool ........................ 58
8 System integration ................ 60
8.1 Overview of the Device Description files
(DTM) .............................. 60
8.2 Measured variables via HART protocol ...... 60
9 Commissioning .................... 61
9.1 Terms related to temperature measurement .. 61
9.2 Initial setting ......................... 62
9.3 Initial screen ......................... 62
9.4 Guidance ............................ 64
10 Operation ......................... 71
10.1 Compatibility mode of NMT53x and NMT81 .. 71
10.2 Application .......................... 72
10.3 System ............................. 87
11 Diagnostics and troubleshooting ... 92
11.1 System error messages .................. 92
11.2 Diagnostic event ...................... 92
11.3 Diagnostics .......................... 97
12 Maintenance .................... 102
12.1 Maintenance tasks .................... 102
12.2 Endress+Hauser services ............... 102
13 Repair ........................... 103
13.1 General information on repairs ........... 103
13.2 Spare parts ......................... 104
13.3 Endress+Hauser services ............... 104
13.4 Return ............................. 104
13.5 Disposal ........................... 104

Table of contents Prothermo NMT81
4 Endress+Hauser
14 Accessories ...................... 105
14.1 Device-specific accessories .............. 105
Index ................................. 110

Prothermo NMT81 About this document
Endress+Hauser 5
1 About this document
1.1 Document function
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.
1.2 Document conventions
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
Alternating current
Direct current and alternating current
Direct current
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a
grounding system.
Protective earth (PE)
Ground terminals that must be connected to ground prior to establishing any other
connections.
The ground terminals are located on the interior and exterior of the device:
• Interior ground terminal: protective earth is connected to the mains supply.
• Exterior ground terminal: device is connected to the plant grounding system.
1.2.3 Tool symbols
Phillips head screwdriver

About this document Prothermo NMT81
6 Endress+Hauser
Flat blade screwdriver
Torx screwdriver
Allen key
Open-ended wrench
1.2.4 Symbols for certain types of information and graphics
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
Reference to graphic
Notice or individual step to be observed
1.
,
2.
,
3.
Series of steps
Result of a step
Operation via operating tool
Write-protected parameter
1, 2, 3, ...
Item numbers
A, B, C, ...
Views
Safety instructions
Observe the safety instructions contained in the associated Operating Instructions

Prothermo NMT81 About this document
Endress+Hauser 7
1.3 Documentation
The following documentation types are available in the Downloads 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 nameplate
•Endress+Hauser Operations App: Enter the serial number from the nameplate or
scan the 2D matrix code (QR code) on the nameplate
1.3.1 Technical Information (TI)
Planning aid
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.
1.3.2 Brief Operating Instructions (KA)
Guide that takes you quickly to the 1st measured value
The Brief Operating Instructions contain all the essential information from incoming
acceptance to initial commissioning.
1.3.3 Operating Instructions (BA)
The 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.
1.3.4 Description of Device Parameters (GP)
The Description of Device Parameters provides a detailed explanation of each individual
parameter in the operating menu(except the Expert menu). The description is aimed at
those who work with the device over the entire life cycle and perform specific
configurations.
1.3.5 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.
1.3.6 Installation instructions (EA)
Installation Instruction are used to replace a faulty unit with a functioning unit of the same
type.

About this document Prothermo NMT81
8 Endress+Hauser
1.4 Registered trademarks
FieldCare®
Registered trademark of the Endress+Hauser Process Solutions AG, Reinach, Switzerland

Prothermo NMT81 Basic safety instructions
Endress+Hauser 9
2 Basic safety instructions
2.1 Requirements for the personnel
The personnel for installation, commissioning, diagnostics and maintenance must fulfill
the following requirements:
‣Trained, qualified specialists must have a relevant qualification for this specific function
and task.
‣Are authorized by the plant owner/operator.
‣Are familiar with federal/national regulations.
‣Before starting work, read and understand the instructions in the manual and
supplementary documentation as well as the certificates (depending on the
application).
‣Follow instructions and comply with basic conditions.
The operating personnel must fulfill the following requirements:
‣Are instructed and authorized according to the requirements of the task by the facility's
owner-operator.
‣Follow the instructions in this manual.
2.2 Designated use
Application and measured materials
Measuring devices for use in hazardous areas, in hygienic applications or in applications
where there is an increased risk due to process pressure, are labeled accordingly on the
nameplate.
To ensure that the measuring device remains in proper condition for the operation time:
‣Only use the measuring device in full compliance with the data on the nameplate and
the general conditions listed in the Operating Instructions and supplementary
documentation.
‣Check the nameplate to verify if the device ordered can be put to its intended use in the
approval-related area (e.g. explosion protection, pressure vessel safety).
‣If the measuring device is not operated at atmospheric temperature, compliance with
the relevant basic conditions specified in the associated device documentation is
absolutely essential.
‣Protect the measuring device permanently against corrosion from environmental
influences.
‣Observe the limit values in the "Technical Information".
The manufacturer is not liable for damage caused by improper or non-designated use.
2.3 Workplace safety
For work on and with the device:
‣Wear the required personal protective equipment according to federal/national
regulations.
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.

Basic safety instructions Prothermo NMT81
10 Endress+Hauser
Conversions 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 the manufacturer.
Repair
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 the manufacturer only.
Hazardous area
To eliminate a danger for persons or for the facility when the device is used in the
hazardous area (e.g. explosion protection, pressure vessel safety):
‣Based on the nameplate, check whether the ordered device is permitted for the
intended use in the hazardous 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.
NOTICE
Loss of degree of protection by opening of the device in humid environments
‣If the device is opened in a humid environment, the degree of protection indicated on
the nameplate is no longer valid. This may also impair the safe operation of the device.

Prothermo NMT81 Product description
Endress+Hauser 11
3 Product description
3.1 Product design
NMT81 converter + average temperature probe version can be included with class A IEC
60751/DIN EN 60751 or class 1/10B Pt100 4-wire RTD sensor elements in its protective
probe for up to 24 elements. It is able to accurately measure the temperature of each
element by measuring its temperature dependent resistance. NMT81 converter +
temperature probe version conforms to intrinsic safety standards, and because NMT81
consumes very little power, it guarantees superior safety as an electrical device that is
installed in tanks in hazardous locations, and ecological/environmentally friendly as well.
12
4
5
1
3
4
5
6
6
1.
A1.
B
A0042800
 1 Design of Prothermo NMT81
A NMT81 with water bottom (WB)
B NMT81 without water bottom (WB)
1 Converter
2 Welded flange
3 Adjustable flange
4 Flexible sensor probe
5 Water bottom (WB) sensor probe
6 Flexible sensor probe without WB

Incoming acceptance and product identification Prothermo NMT81
12 Endress+Hauser
4 Incoming acceptance and product
identification
4.1 Incoming acceptance
Upon receipt of the goods check the following:
• Are the order codes on the delivery note and the product sticker identical?
• Are the goods undamaged?
• Do the nameplate data match the ordering information on the delivery note?
• If required (see nameplate): Are the Safety Instructions (XA) enclosed?
If one of these conditions is not satisfied, contact your Endress+Hauser Sales Center.
4.2 Product identification
The following options are available for identification of the measuring device:
• Nameplate specifications
• Extended 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.
• Enter the serial number from the nameplates into the Endress+Hauser Operations App
or scan the 2-D matrix code (QR code) on the nameplate with the Endress+Hauser
Operations App: all the information for the measuring device is displayed.
For an overview of the scope of the associated Technical Documentation, refer to the
following:
• The W@M Device Viewer: Enter the serial number from the nameplate
(www.endress.com/deviceviewer)
• The Endress+Hauser Operations App: Enter the serial number from the nameplate or
scan the 2-D matrix code (QR code) on the nameplate.

Prothermo NMT81 Incoming acceptance and product identification
Endress+Hauser 13
4.2.1 Nameplate
56
Prothermo
Date:
Order code: Ser. no.:
Ext. ord. cd.:
# Elements:
Length =
Mat.:
WB length =:
FW:
Dev.Rev.:
HW:
certificate:
14...30 V DC 2-wire HART
MWP:
Ta: -40...+60°C Tp:
1
23
4
5
6
8910
11
12 13 14
15 16
17
18 19
20 21
23 24
25
22
7
T ≥ Ta +20K
A0042783
 2 Nameplate of Prothermo NMT81
1 Manufacturer address
2 Order code
3 Serial number
4 Extended order code
5 Intrinsically safe parameters
6 Process temperature
7 Maximum working pressure
8 Length of temperature sensor probe
9 Number of elements
10 Length of Water Bottom
11 Material in contact with process
12 Firmware version
13 Hardware revision
14 Cable entry standard
15 Device revision
16 Ingress protection
17 Additional information of the device version
18 PTB certification number (for PTB approval type)
19 Manufacturing date
20 Certificate symbol
21 Data concerning Ex approvals
22 Associated Safety Instruction (XA)
23 Associated Safety Instruction (XA) for Local language
24 Manufacturer info. for local language
25 Device data for local language
4.3 Manufacturer contact address
Endress+Hauser Yamanashi Co., Ltd.
406-0846
862-1 Mitsukunugi, Sakaigawa-cho, Fuefuki-shi, Yamanashi
4.4 Storage and transport
4.4.1 Storage conditions
• Storage temperature
• –40 to +85 °C (–40 to +194 °F) with display
• –40 to +90 °C (–40 to +194 °F) without display
• Store the device in its original packaging.
4.4.2 Transporting to the measuring point
LCAUTION
Risk of injury
‣Follow the safety instructions and transport conditions for devices weighing more than
18 kg (39.69 lb).

Installation Prothermo NMT81
14 Endress+Hauser
5 Installation
5.1 Converter
ø100.9 (3.97)
182.3 (7.18)
96.9 (3.81)
A0042779
 3 Standard converter. Unit of measurement mm (in)
5.2 Option 1: Converter with universal coupling
339.3 (13.36)
192.8 (7.59)
52 (2.05)
1
2
A0042765
 4 Option 1: converter (Standard G3/4 (NPT 3/4) universal coupling connection). Unit of
measurement mm (in)
1 G 1/2 dummy plug
2 G 3/4 thread
5.2.1 Option 1: Measurement functions
Because the software in the converter is equipped with a function that converts elements
with different characteristics, it is possible to use other brand's temperature probes.
The NMT81 converter only version supports the following element types:
Elements Standard Temperature coefficient
Pt100 IEC60751 α=0.00385
Pt100 GOST α=0.00391

Prothermo NMT81 Installation
Endress+Hauser 15
Elements Standard Temperature coefficient
Cu100 GOST α=0.00428
Ni100 GOST α=0.00617
• If elements other than the items above are required, contact your Endress+Hauser
Sales Center.
• NMT81 is four-wire only with MRTs (Multi-Resistance thermometers) and/or MSTs
(Multi-spot thermometers), but it is not compatible with a thermo coupling
temperature device.
• The physical connection between a probe and NMT81 is completed by a zinc-plated
carbon steel G 3/4" (NPT 3/4") universal threaded coupling. If a different thread size
is required, Endress+Hauser can provide the simplest and most efficient solution by
adapting a variety of coupling sizes and materials based on existing temperature
probe specifications. Contact your Endress+Hauser Sales Center.
• Power supply and data transmission lines are both provided from the host gauge of
NMS5, NMS8x, NMR8x, NRF81 or NRF590 through a two-wire local HART loop
connection. NMT81 can be configured and operated using FieldCare, which has a
user-friendly interface.
5.3 Option 2: Converter with M20 mounting thread
This option model is designed specifically to connect with a Whessoe Varec 1700 series
average temperature probe. WB data is not available because the 1700 series does not
have WB.
182.3 (7.18)
M20
32 (1.26)
37
(1.46) 1
2
A0042766
 5 Option 2: converter (Varec 1700, M20 threaded connection). Unit of measurement mm (in)
1 Existing 1700 series RT probe terminal box on-site
2 Lock nut
UK model M20 threaded type and Varec 1700 terminal housing connection procedure
1. Use sealing tape to protect the threaded connection opening, and insert the cable
bundle (RTD signal entry cable) into the female threaded connection opening on the
terminal box.
2. Screw on the NMT81 converter by rotating it at least 10 times clockwise, and secure
it with a lock nut.
 A loose connection between NMT81 and Varec1700 terminal housings will lead
to malfunction due to ingress of flood and other factors.
This completes the procedure.

Installation Prothermo NMT81
16 Endress+Hauser
5.3.1 Option 2: Measurement functions
Option 2 has the same functions as option 1; however, option 2 is designed so that a
special M20 threaded connection opening fits directly in the existing terminal housing of a
Varec 1700. The wiring of RTD signals from the probe to NMT81 is done in the terminal
box of the Varec 1700 and not on the NMT81 side. For this reason, there is no additional
housing provided to NMT81 as in option 1.
5.4 Converter + average temperature probe version
ø27.2
(1.07)
d
c: 19.5 (0.77)
ø27.2
(1.07)
a
182.3
(7.18)
b
180
(7.09)
b
180
(7.09)
ø100.9
(3.97)
d
1
2
3
1.
A1.
Bø100.9
(3.97)
a
182.3
(7.18)
c: 19.5 (0.77)
ø27.2
(1.07)
d
1
2
A0042769
 6 Converter + average temperature probe. Unit of measurement mm (in)
A Adjustable flange
B Welded flange
a Converter height
b Adjustable installation height
c Based on flange standards
d Temperature probe length (see below)
1 316L
2 316L
3 316L
The following tolerances are applied regardless of whether or not there is an optional WB
probe. However, the position of the flange cannot be adjusted in a welded flange type.
Probe length Tolerance of probe and element positions
1 000 to 25 000 mm (39.37 to 984.25 in) ± 50 mm (1.97 in)
25 001 to 40 000 mm (984.29 to 1 574.80 in) ± 50 mm (1.97 in)
40 001 to 60 000 mm (1 574.84 to 2 362.21 in) ± 100 mm (3.94 in)
60 001 to 100 000 mm (2 362.24 to 3 937.01 in) ± 300 mm (11.81 in)

Prothermo NMT81 Installation
Endress+Hauser 17
5.5 Converter + average temperature probe + water
bottom probe
3
c: 19.5 (0.77)
ø27.2
(1.07)
a
182.3
(7.18)
b
180
(7.09)
b
180
(7.09)
ø100.9
(3.97)
d
ø42.7
(1.68)
7
7
ø42
(1.65)
10 (0.39)
d
e
530 /1030/2030
(20.87/40.55/79.92)
f
1.
A1.
B
ø100.9
(3.97)
a
182.3
(7.18)
c: 19.5 (0.77)
d
34
5
6
6
1
2
1
2
5
A0042767
 7 Converter + temperature probe + WB probe. Unit of measurement mm (in)
A Adjustable flange
B Welded flange
a Converter height
b Adjustable installation height
c Based on flange standards
d Probe length (from flange bottom to the tip of WB probe) (see below)
e Capacitance WB probe
f Anchor weight hook (316L)
1 316L
2 316L
3 PFA protection tube (thickness 1 mm (0.04 in))
4 Sensor pipe (304)
5 Pt100 element
6 Base plate/side rod (316L)
7 Element

Installation Prothermo NMT81
18 Endress+Hauser
The following tolerances are applied regardless of whether or not there is an optional WB
probe. The position of the flange cannot be adjusted in a welding flange type.
Probe length Tolerance of probe and element positions
1 000 to 25 000 mm (39.37 to 984.25 in) ± 50 mm (1.97 in)
25 001 to 40 000 mm (984.29 to 1 574.80 in) ± 50 mm (1.97 in)
40 001 to 60 000 mm (1 574.84 to 2 362.21 in) ± 100 mm (3.94 in)
60 001 to 100 000 mm (2 362.24 to 3 937.01 in) ± 300 mm (11.81 in)

Prothermo NMT81 Installation
Endress+Hauser 19
5.6 Flanges
Welded flanges are more watertight because the joint is completely welded together.
However, the position of welded flanges cannot be adjusted.
ø100.9
(3.97)
182.3 (7.18)
96.9 (3.81)
1
A0042770
 8 Welded flange. Unit of measurement mm (in)
1 Flange (JIS, ASME, JPI, DIN)
96.9 (3.81)
ø100.9
(3.97)
1
390.35 (15.37)
A0042793
 9 Adjustable flange. Unit of measurement mm (in)
1 Flange (JIS, ASME, JPI, DIN)

Installation Prothermo NMT81
20 Endress+Hauser
5.7 Element No. 1 position
Element No. 1 is mounted inside the probe according to the combinations of order
specifications as described in the figure below.
When selecting 085 = E, the position of element No.1 can be ordered in a range from
100 mm (3.94 in) (b in the figure) to 315 mm (12.40 in) from the bottom of the flange (d
in the figure) depending on the customer’s application.
When selecting 085 = F, the element No. 1 is mounted at the position of
100 mm (3.94 in)from the bottom of the probe (b in the figure), and the element at the
highest point is mounted at a position 315 mm (12.40 in) (d in the figure) from the
bottom of the flange. All other elements are mounted at a spacing determined by
following formula.
Element spacing = –100 mm (–3.94 in) - –315 mm (–12.40 in)) / (number of measuring
points - 1)
a
400 (15.75)
a
200
(7.87)
100
b (3.94) 085=A, B, C, D
090=00
620=w/o R3, R4, R5
085=A, B, C, D
090=00
620=R4
085=A, B, C, D
090=00
620=R5
085=A, B, C, D
090=05, 10, 20
620=w/o R3, R4, R5
085=A, B, C, D
090=05, 10, 20
620=R4
085=A, B, C, D
090=05, 10, 20
620=R5
085=A, B, C, D
090=05, 10, 20
620=R3
085=A, B, C, D
090=00
620=R3
c
d
300
(11.81)
e
1.
A1.
B
A0041270
 10 Position of NMT81 element No. 1 based on the installation method. Unit of measurement mm (in)
A Converter + temperature probe
B Converter + temperature probe + WB probe
a Recommended installation
b Element No.1
c Factory default setting distance from flange bottom to flexible probe: 215 mm (8.46 in)
d Minimum distance from flange bottom to upper element: 315 mm (12.40 in)
e Tank bottom/Datum plate