Endress+Hauser NMS83 Specifications
TI01250G/00/EN/04.18
71411299
2018-07-13
Products
Solutions Services
Technical Information
Proservo NMS83
Tank Gauging
Application
Proservo NMS8x Series intelligent tank gauges are designed for high accuracy liquid
level measurement in storage and process applications. They fulfill the exacting
demands of tank inventory management, inventory control, custody transfer, loss
control, total cost saving, and safe operation.
Typical areas of application
• Precise level, interface, and density measurement of alcohols and beverages
• Tank mounted intelligence makes NMS8x ideal for single or multi-task
installation, covering a wide range of measurement functions including Liquid
level, Interface level, Spot density, Density profile, Tank bottom, and Water dip and
integrating a wide range of tank sensor measurement functions including Water
level, Temperature, and Pressure.
Your benefits
• SIL2 certified (Min, Max, Continuous level)
• SIL3 (in preparation)
• Measures liquid level to an accuracy of +/- 0.4 mm (0.016 in)
• Measurement of up to two interface levels and density of up to three liquid phases
• Liquid density profiling of up to 50 points throughout the tank or upper layer,
configurable.
• Wetted parts are completely separated from the electronic circuit
• Tank top mounting with 3” flange
• Wide range of output signals including V1, Modbus RS 485, and HART protocol
• Material and pressure rating of the wetted parts can be selected.
• Suitable for atmospheric and high pressure applications up to 6 bar/600 kPa/
87 psi
• Integration of e.g. temperature, water level, pressure, overfill prevention sensor
• Direct connection of spot or average temperature sensor
• Robust IP66/68, NEMA Type 4x/6P enclosure
• Operation and display in a wide variety of local languages
• Easy commissioning, maintenance, and diagnostics via FieldCare
Table of contents
Proservo NMS83
Document information ....................... 3
Symbols .................................... 3
Function and system design ................... 5
Measuring principle ............................ 5
Integration of tank sensors ....................... 6
Measuring system ............................ 14
Input/output .............................. 15
Level measurement ........................... 15
HART Ex ia/IS active input ...................... 16
I/O modules ................................ 17
Power supply ............................. 23
Terminal assignment .......................... 23
Sources for gauge commands ..................... 23
Supply voltage .............................. 25
Cable entries ............................... 26
Cable specification ............................ 26
Overvoltage protection ......................... 26
Performance characteristics .................. 27
Reference operating conditions ................... 27
Measured value resolution ...................... 27
Maximum measured error ....................... 27
Hysteresis ................................. 27
Repeatability ............................... 28
Linearity .................................. 28
Long-term drift .............................. 28
Influence of ambient temperature ................. 28
Influence of medium temperature .................. 28
Influence of medium pressure .................... 28
Effect of gas phase ............................ 28
Installation ............................... 29
Requirements ............................... 29
Environment .............................. 35
Ambient temperature range ..................... 35
Classification of environmental conditions according to
DIN EN 60721-3-4 ........................... 35
Storage temperature .......................... 35
Humidity .................................. 35
Degree of protection .......................... 35
Electromagnetic compatibility (EMC) ............... 35
Mechanical construction .................... 39
Dimensions ................................ 39
Weight ................................... 39
Materials .................................. 40
Operability ............................... 41
Operating concept ............................ 41
Operating options ............................ 41
Local operation .............................. 41
Remote operation ............................ 42
Operation via service interface .................... 42
Certificates and approvals ................... 43
CE mark ................................... 43
RCM-Tick marking ............................ 43
Ex approval ................................ 43
Single seal according to ANSI/ISA 12.27.01 ........... 43
Functional Safety (SIL) ......................... 43
WHG ..................................... 43
Weight & Measure approval ..................... 43
Non-ionizing radiation protection .................. 43
Pressure Equipment Directive 2014/68/EU (DGRL / PED) .. 43
Test, certificate .............................. 44
Other standards and guidelines ................... 44
Ordering information ....................... 45
Ordering information .......................... 45
Marking .................................. 45
Shipping condition ............................ 45
Application packages ....................... 46
Advanced tank measurement methods .............. 46
Accessories ............................... 49
Device-specific accessories ...................... 49
Communication-specific accessories ................ 52
Service-specific accessories ...................... 52
System components ........................... 52
Documentation ............................ 53
Technical Information (TI) ...................... 53
Brief Operating Instructions (KA) .................. 53
Operating Instructions (BA) ..................... 53
Description of Device Parameters (GP) ............... 53
Safety instructions (XA) ........................ 54
Process .................................. 36
Process temperature range ...................... 36
Process pressure range ......................... 36
Medium density ............................. 36
Medium density difference for interface measurement .... 37
Viscosity .................................. 37
Registered trademarks ...................... 55
Custody transfer approval ................... 38
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Proservo NMS83
DANGER
WARNING
CAUTION
NOTICE
A
Document information
Symbols Safety symbols
Symbol Meaning
Electrical 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.
NOTE!
This symbol contains information on procedures and other facts which do not result in
personal injury.
Symbol Meaning
Direct current
Alternating current
Direct current and alternating current
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a
grounding system.
Protective ground connection
A terminal which must be connected to ground prior to establishing any other
connections.
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.
Symbols for certain types of information
Symbol Meaning
Permitted
Procedures, processes or actions that are permitted.
Preferred
Procedures, processes or actions that are preferred.
Forbidden
Procedures, processes or actions that are forbidden.
Tip
Indicates additional information.
Reference to documentation
Reference to page
Reference to graphic
Visual inspection
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Symbols in graphics
1.
-
.
Symbol Meaning
1, 2, 3 ... Item numbers
, 2., 3.… Series of steps
A, B, C, ... Views
A-A, B-B, C-C, ... Sections
Symbols at the device
Symbol Meaning
Safety instructions
Observe the safety instructions contained in the associated Operating Instructions.
Temperature resistance of the connection cables
Specifies the minimum value of the temperature resistance of the connection cables.
Proservo NMS83
Hazardous area
Indicates a hazardous area.
Safe area (non-hazardous area)
Indicates the non-hazardous area.
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Proservo NMS83
CPU
1
2
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8
AB
C
Function and system design
Measuring principle
NMS8x is an intelligent tank gauge for measuring liquid levels with high precision. The system is
based on the principle of gauging displacement.
A small displacer is accurately positioned in a liquid medium using a stepping motor. The displacer is
then suspended on a measuring wire which is wound onto a finely grooved wire drum. NMS8x
counts the rotations of the wire drum and to calculate the traveling distance of the wire and obtain
the liquid level change.
The drum is driven via coupling magnets that are completely separated by the drum housing. Outer
magnets are connected to the wire drum, with inner magnets connected to the drive motor. As the
inner magnets turn, their magnetic attraction causes the outer magnets to turn, as well, causing the
entire drum assembly to turn. The weight of the displacer on the wire creates torque on the outer
magnets generating change of magnetic flux. These changes generated in the drum assembly are
detected by a unique electromagnetic transducer on the inner magnets. The transducer transmits the
weigh signal to a CPU using a non contact principle (patented). The drive motor is actuated to keep
the weigh signal constant at set value defined by the operating command.
When the displacer is lowered and touches a liquid, the weight of the displacer is reduced by liquid
buoyancy force, which is measured by a temperature-compensated magnetic transducer. As a result,
the torque in the magnetic coupling changes, and this is measured by six hall sensors. A signal
indicating the weight of the displacer is sent to the motor control circuit. As the liquid levels rise and
fall, the displacer position is adjusted by the drive motor. The rotation of the wire drum is
continuously evaluated to determine the level value using a magnetic rotary encoder. In addition to
gauging the level, NMS8x can measure the interfaces between up to three liquid phases, and the
tank bottom, as well as spot and profile densities.
1 Operating principle
A Displacer position data
B Weight data
1 Encoder
2 Motor
3 Rotary transformer
4 Shafts
5 Gears
6 Wire drum
7 Measuring wire
8 Displacer
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A0026903
Proservo NMS83
3
3
2
2
1
1
RTD
A
B
HART
Integration of tank sensors
In addition to measuring the level, interfaces, tank bottom, and density, the device can also be used
to integrate of tank sensors into tank inventory systems. All measured and calculated values can be
displayed on the built-in display. They can be transferred to an inventory control system via a field
communication protocol.
A0026902
2 Measuring system
A HART multidrop mode
B HART and analog mode
1 Spot temperature
2 Proservo NMS8x
3 Field protocol transmits data to an inventory control system
Typical values measured by the sensors are:
• Level
• Spot temperature
• Average temperature
• Water level
• Pressure
• Secondary level value (for critical applications)
Major applications
The number of measuring functions and output options, as well as the compact design, enables
NMS8x to be installed in a wide range of applications at minimal cost.
Alcohol, food, and beverage industries
In alcohol, food, and beverage processes and storages, there exist an extensive need to measure and
manage a wide variety of products. Remote tank gauging by NMS8x combined with an inventory
management system is an ideal way to measure and manage tank contents.
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Proservo NMS83
3
4
1
2
Typical tank installation
A0026904
3 Typical tank installation 1
1 NMS8x
2 Measuring wire
3 Displacer
4 Stilling well
When installing NMS8x to a floating roof tank, be sure to use a stilling well to protect the
measuring wire. Otherwise the wire may break due to an external shock.
Application
NMS8x is primarily a highly accurate level measurement gauging instrument with the added ability
to measure density. The following level measurements are supported: liquid surface level and
interface level(s) between different liquids, as well as finding tank floor or datum plate. The
following density measurements are supported: single-point (spot measurements), as well as profile
measurements of all liquid(s) in a tank.
The choice of the most suitable displacer depends on the liquid conditions and measurement
functions. These can be classified as follows:
• Single measurement value only, e.g. level, interface, or density
• Multiple measurement application, e.g. level, interface, and density
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Measurement terminology
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1
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Proservo NMS83
A0026906
4 NMS8x with standard level, I/F x 2, Tank bottom and spot density x 3 measurement
1 Upper density
2 Middle density
3 Lower density
4 Tank bottom
5 Lower I/F
6 Upper I/F
7 Level
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Proservo NMS83
BA C
4
3
1
2
5
6
A0026907
5 Density Profile measurement
A Tank profile: density profiling throughout tank
B Interface profile: density profiling withing upper phase
C Manual profile: density profiling from a specific position to level
1 Level
2 Manual profile level
3 Upper phase (alcohol, liquid food, or beverage)
4 Middle phase (emulsion)
5 Lower phase (water)
6 Tank bottom
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Proservo NMS83
Displacer selection guide
A wide variety of displacers are available to suit different application. Proper displacer selection
ensures optimal performance and longevity. The following guidelines will assist you in selecting the
most suitable displacer for your application.
Displacer types
The following NMS8x displacers are available.
50 mm (1.97 in) 70 mm (2.76 in)
316L/PTFE 316L
A0032430
A0032429
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Proservo NMS83
A
Ø50.8 (2)
a
45 (1.77)
85 (3.35)
116.6 (4.59)
2.5 (0.09)
B
Ø50 (1.97)
a
35 (1.38)
82.7 (3.26)
46.7 (1.84)
11.5
(0.45)
11.5
(0.45)
C
17 (0.67)
46.6 (1.83)
1 (0.03)
90 (3.54)
Ø70(2.76)
a
Displacer dimensions
A ⌀50 mm (1.97 in) 316L cylindrical displacer
B ⌀50 mm (1.97 in) PTFE cylindrical displacer
C ⌀70 mm (2.76 in) 316L conical displacer
a Immersion point
A0029581
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Proservo NMS83
A
Ø50.8 (2)
a
45 (1.77)
85 (3.35)
116.6 (4.59)
2.5 (0.09)
B
Ø50 (1.97)
a
35 (1.38)
82.7 (3.26)
46.7 (1.84)
11.5
(0.45)
11.5
(0.45)
C
17 (0.67)
46.6 (1.83)
1 (0.03)
90 (3.54)
Ø70(2.76)
a
A ⌀50 mm (1.97 in) 316L cylindrical displacer
B ⌀50 mm (1.97 in) PTFE cylindrical displacer
C ⌀70 mm (2.76 in) 316L conical displacer
a Immersion point
Weight (g) 253 250 245
Volume (ml) 143 118 124
Balance volume (ml) 70.7 59 52.8
Item
⌀50 mm (1.97 in) 316L
cylindrical displacer
⌀50 mm (1.97 in) PTFE
cylindrical displacer
⌀70 mm (2.76 in) 316L
conical displacer
The weight, volume, and balance volume are individually determined by each displacer and also
might vary depending on the values stated above.
Recommended displacer by application
Application Product level Interface level Density
Viscous liquid 50 mm (1.97 in) PTFE Not Recommended Not Recommended
Not viscous liquid (e.g. alcohol) 50 mm (1.97 in) 316L 50 mm (1.97 in) 316L 50 mm (1.97 in) 316L
A0029581
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Proservo NMS83
Product level
In general, larger diameter displacers have better accuracy under similar conditions.
Interface level(s)
Cylindrical-shaped displacers, with rounded top and bottom, reduce resistance while moving through
liquid(s). This provides smoother movement and faster interface measurements compared to flatfaced displacers, particularly in density profile measurements that span the full tank height.
In order to move a displacer down through liquids, the displacer density (weight divided by
volume) must be higher than the liquid density.
Tank bottom and datum plate level
70 mm (2.76 in) and 50 mm (1.97 in) displacers reduce resistance while moving through liquids.
This provides smoother movement and faster interface measurements.
Density
Since the density is the calculated result of two measurements, a displacer with higher volume will
usually yield the most accurate density measurement. In most cases we recommend our
50 mm (1.97 in) diameter displacer for density measurement.
For non-viscous applications (e.g. clear alcohol), the 70 mm (2.76 in) displacer also works very well.
Level and density
When an application calls for equal emphasis on measuring both level and density, the
50 mm (1.97 in) and the 70 mm (2.76 in) diameter displacers will give the best all-around
performance.
Custody transfer
The 50 mm (1.97 in) displacer or larger is the choice for requirements per NMi.
The 110 mm (4.33 in), conical 316L displacer is the choice for requirements per PTB.
Material compatibility
Displacers are available in three different standard materials. Material compatibility should be
confirmed to ensure safe operation and optimal NMS8x performance.
316L
Stainless steel is a highly versatile industrial material that provides good compatibility with a wide
range of alcohol, liquid food, and beverage applications.
Alloy C
This high-performance material is harder than 316L, and provides excellent resistance to many of
the harshest corrosive chemical applications.
PTFE
One of the most well-known and versatile polymer materials, this high-performance material has
one of the lowest friction coefficients. It provides excellent performance in viscous/sticky liquids, and
also has excellent chemical resistance to a wide range of corrosives.
Process connection size
The process connection defines the tank process entry, and may affect the displacer size. The
standard NMS8x process connections start at 3”/DN80 and fit most tank gauging applications.
Accordingly, most applications can be covered with one of the 50mm or 70mm displacer options.
Smaller diameter displacers are available when the process connection is smaller.
When the 110 mm (4.33 in) diameter custody transfer approval (PTB) displacer is selected, a
separate calibration and maintenance chamber is recommended between the NMS8x and tank
process connection.
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Proservo NMS83
NXA820
NXA820
NXA820
NXA820
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23 3 5 2 3
4 6
8
13
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15
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Measuring system
• From single tank level measurement to the largest process applications, Endress+Hauser tank
gauging devices are an integral part of tank farm management solutions. A wide variety of data
output protocols are available for seamless integration into many commonly used systems.
• A primary example is Tankvision from Endress+Hauser. Tankvision is a scalable system offering
local tank management for multiple loops via Modbus or V1 protocols. Accumulated data is
available to DCS and other plant management systems via a Host Link.
A0030168
6 Integration of tank gauging devices into an inventory management system (typical example)
1 Proservo NMS8x
2 Pressure transmitter (e.g. Cerabar)
3 Spot temperature (e.g. Modular thermometer)
4 Tankside Monitor NRF81
5 Micropilot S FMR5xx
6 Micropilot NMR8x
7 Field protocol (e.g. Modbus, V1)
8 Tankvision Tank Scanner NXA820
9 Ethernet
10 Ethernet switch
11 Internet Browser
12 Tankvision Data Concentrator NXA821
13 Tankvision Host Link NXA822
14 Modbus
15 DCS or PLC
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Proservo NMS83
Input/output
Level measurement Measured variable
Proservo is primarily a highly accurate level measurement gauging instrument, with the added
ability to measure interfaces and densities. The following level measurements are supported: liquid
surface level and interface level(s) between different liquids, as well as finding tank bottom or datum
plate. The following density measurements are supported: single-point (called “spot”
measurements), as well as profile measurements of all liquid(s) in a tank.
Measuring range
• Level and interface: Max. 22 m (72 ft)(longer range is possible as special product)
• Density: 0.4000 to 2.000 g/cm
The level and interface measuring range depends on the measuring wire and material compatibility
to measured medium. Measuring wires are available in three different standard materials. Material
compatibility should be confirmed to ensure safe operation and optimal measuring performance.
3
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HART Ex ia/IS active input
D
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C
B
A
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HR
CDI
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POWER
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CDI
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1 2 3 4
1 2 3 4
Proservo NMS83
A0027364
7 HART Ex ia/IS active input
E1 HART +
E2 HART -
The device has a HART Ex ia/IS active input. Additional features are provided if the following
Endress+Hauser devices are connected:
Prothermo NMT
The measured level is transmitted to the Prothermo. Prothermo uses this level to calculate the
average temperature of the product.
Technical data
Transmitter power supply voltage 23.0 V - 380 Ω ⋅ I
load
Maximum load 500 Ω including signal line
Maximum current of all connected devices 24 mA
The HART Ex ia/IS active input is available by default. It needs not to be chosen explicitly when
ordering a device.
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Proservo NMS83
E
G
F
1
1
1
1 3
2
2
2 4
HR
CDI
WP
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POWER
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C
B
A
1122334
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112233445566778
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CDI
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22334
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112233445566778
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POWER
NMx8x - XX xx xxxxxx ...
040
NMx8x - xx XX xxxxxx ...
050
I/O modules Overview
8 Position of the I/O modules in the terminal compartment
The terminal compartment contains up to four I/O modules, depending on the order code.
• Modules with four terminals can be in any of these slots.
• Modules with eight terminals can be in slot B or C.
The exact assignment of the modules to the slots is dependent on the device version. For a
detailed description refer to the Operating Instructions of the device in question.
The following restrictions apply when selecting the modules:
• The device may contain a maximum of four I/O modules.
• A maximum of two I/O modules with 8 terminals is possible.
A0027363
Ordering feature 040: "Primary Output"
Option Number of I/O modules Type of I/O module Number of terminals Technical data
A1 1 Modbus RS485 4 → 18
B1 1 V1 4 → 19
E1 1 4-20mA HART Ex d/XP 8 → 20
H1 1 4-20mA HART Ex i/IS 8 → 20
Ordering feature 050: "Secondary IO Analogue"
Option Number of I/O
modules
A1 1 1 x "Ex d/XP 4-20mA HART + RTD input" 1 x 8 → 20
A2 2 2 x "Ex d/XP 4-20mA HART + RTD input" 2 x 8 → 20
B1 1 1 x "Ex i/IS 4-20mA HART+ RTD input" 1 x 8 → 20
B2 2 2 x "Ex i/IS 4-20mA HART+ RTD input" 2 x 8 → 20
C2 2 1 x "Ex i/IS 4-20mA HART + RTD input"
X0 0 none 0 -
Type of I/O module Number of terminals Technical data
2 x 8 → 20
1 x "Ex d/XP 4-20mA HART + RTD input"
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