Endress+Hauser Gammapilot FMG50 Manual

Compact transmitter for non-contact measurement
through vessel walls
Application
• Level, interface, density, concentration and point level measurement
• Measurement in liquids, solids, suspensions or sludges
• Use under extreme process conditions
• All kinds of process vessels
Advantages
• Compact transmitter with loop-powered two-wire technology
• Multifunctional compact transmitter for all measuring tasks: level, interface,
density, concentration and point level
• SIL2 approval according to IEC 61508 and SIL 3 for all measurement tasks with
homogeneous or diverse redundancy
• Heartbeat Technology to verify the correct functioning of the measuring device
within specifications without interrupting the process
• Optimum adjustment to the respective applications and measuring ranges via a
variety of detector materials
• Bluetooth® wireless technology for easy commissioning, operation and
maintenance via the free iOS / Android SmartBlue app
• Use of Gamma Modulator FHG65 for the reliable suppression of interference
radiation irrespective of the isotope
Products Solutions Services
Technical Information
Gammapilot FMG50
Radiometric measurement
TI01462F/00/EN/02.20
71472785
2020-03-30

Gammapilot FMG50
2 Endress+Hauser
Table of contents
About this document ........................ 4
Symbols used ................................ 4
Registered trademarks ....................... 4
Function and system design ................... 5
Application and advantages ...................... 5
Measuring principle ............................ 6
Measuring system ............................. 8
Signal analysis ............................... 9
System integration ........................... 13
Input .................................... 14
Measured variable ............................ 14
Sensitivity ................................. 14
Typical pulse rates ............................ 14
Measuring range ............................. 15
Output .................................. 17
Output signal ............................... 17
Error signal ................................ 17
Load ..................................... 17
Output damping ............................. 17
Power connection .......................... 17
Supply voltage .............................. 17
Overvoltage category .......................... 17
Protection class .............................. 17
Potential equalization ......................... 17
Electrical connection ....................... 17
Connection compartment ....................... 17
4 to 20 mA HART connection .................... 17
Terminal assignment .......................... 18
Cable entries ............................... 18
Potential equalization ......................... 19
Overvoltage protection (optional) .................. 19
Rated cross-section ........................... 19
Fieldbus connectors ........................... 19
FMG50 with RIA15 ........................... 21
Wiring ................................... 23
Wiring examples for point level detection ............ 23
Post-connection check ......................... 24
Performance characteristics/stability ........... 25
Dead time, time constant, settling time .............. 25
Dynamic behavior, current output (HART electronics) .... 25
Dynamic behavior, digital output (HART electronics) ..... 25
Reference operating conditions ................... 25
Measured value resolution ...................... 26
Influence of ambient temperature ................. 26
Statistical fluctuation of the radioactive decay .......... 26
Installation conditions ...................... 27
General ................................... 27
Installation conditions for level measurement .......... 27
Installation conditions for point level detection ......... 27
Installation conditions for density measurement ........ 28
Installation conditions for interface measurement ....... 29
Installation conditions for density profile measurement
(DPS) .................................... 30
Installation conditions for concentration measurement ... 30
Installation conditions for concentration measurement
with radiating media .......................... 31
Installation conditions for flow measurement .......... 31
Environment .............................. 32
Ambient temperature .......................... 32
Climate class ............................... 32
Operating altitude as per IEC 61010-1 Edition 3.1 ....... 32
Degree of protection .......................... 32
Vibration resistance ........................... 32
Shock resistance ............................. 33
Electromagnetic compatibility (EMC) ............... 33
Process conditions ......................... 33
General ................................... 33
Process temperature .......................... 33
Process pressure ............................. 33
Mechanical construction .................... 33
Dimensions, weights .......................... 33
Materials .................................. 34
Measuring range marks ........................ 35
Human interface ........................... 35
Electronic insert / display ....................... 35
Remote operation ............................ 35
Local operation .............................. 37
Certificates and approvals ................... 37
Functional safety ............................. 38
Ex approval ................................ 38
Other standards and guidelines ................... 38
Certificates ................................. 38
CE mark ................................... 38
EAC ..................................... 38
Overfill prevention ............................ 38
Ordering information ....................... 38
Ordering information .......................... 38
Application packages ....................... 39
SIL wizard ................................. 39
Heartbeat Diagnostics ......................... 39
Heartbeat Verification ......................... 40
Heartbeat Monitoring ......................... 41
Accessories ............................... 41
Commubox FXA195 HART ...................... 41
Field Xpert SFX350, SFX370, SMT70 ............... 41
Mounting device (for level and point level measurement) .. 42

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Clamping device for density measurement FHG51 ....... 45
Process indicator RIA15 ........................ 46
Supplementary documentation for Gammapilot
FMG50 .................................. 46
Fields of activity ............................. 46
Operating Instructions ......................... 46
Description of Device Functions ................... 47
Functional safety ............................. 47
Clamping device for density measurement ............ 47
Supplementary documentation for radiation
source, source containers and modulator ........ 47
Radiation source FSG60, FSG61 ................... 47
Source container FQG60 ........................ 47
Source container FQG61, FQG62 .................. 47
Source container FQG61, FQG62 .................. 47
Source container FQG66 ........................ 47
Gamma Modulator FHG65 ...................... 47

Gammapilot FMG50
4 Endress+Hauser
About this document
Symbols used Safety symbols
CAUTION
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in minor or
medium injury.
DANGER
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in serious or
fatal injury.
NOTICE
This symbol contains information on procedures and other facts which do not result in personal
injury.
WARNING
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in serious or
fatal injury.
Symbols for certain types of information
Warns against radioactive substances or ionizing radiation
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
Symbols in graphics
1, 2, 3, ...
Item numbers
A, B, C, ...
Views
Registered trademarks
HART®
Registered trademark of the FieldComm Group, Austin, Texas, USA
Apple®
Apple, the Apple logo, iPhone, and iPod touch are trademarks of Apple Inc., registered in the U.S.
and other countries. App Store is a service mark of Apple Inc.
Android®
Android, Google Play and the Google Play logo are trademarks of Google Inc.
Bluetooth®
The Bluetooth® word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and
any use of such marks by Endress+Hauser is under license. Other trademarks and trade names are
those of their respective owners.

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Endress+Hauser 5
Function and system design
Application and advantages Application
• Level, interface, density, concentration and point level measurement
• Measurement in liquids, solids, suspensions or sludges
• Use in extreme process conditions: high pressure, high temperature, corrosion, abrasion, viscosity,
toxicity
• All kinds of process vessels, e.g. reactors, autoclaves, separators, acid tanks, cyclones
Advantages
• Compact transmitter with two-wire technology
• Loop-powered: no separate evaluation unit necessary
• Maximum safety thanks to intrinsically safe Ex-ia power supply
• Multifunctional compact transmitter for all measuring tasks: level, interface, density,
concentration and point level
• SIL2 approval according to IEC 61508 and SIL 3 for all measurement tasks with homogeneous or
diverse redundancy. Permanent process and device diagnostics with high level of diagnostic
coverage.
• Heartbeat Technology:
• Verification of the correct functioning of the measuring device within specifications without
interrupting the process
• Monitoring of internal device health parameters as part of "predictive maintenance" (in
preparation)
• Variety of detectors ensure optimum adaptation to the individual applications and measuring
ranges:
• Thallium-doped sodium iodide (NaI (TI)) crystal scintillator, available in lengths 50 mm (2 in),
100 mm (4 in) and 200 mm (8 in)
• Standard and high-temperature PVT scintillators up to 3 m (118.1 ft) in length
• Bluetooth® wireless technology for easy commissioning, operation and maintenance via the free
iOS / Android SmartBlue app
• Easy, guided commissioning with intuitive user interface
• Easy proof testing for SIL and WHG
• 316L stainless steel housing for heavy-duty applications
• Use of Gamma Modulator FHG65 for the reliable suppression of interference radiation irrespective
of the isotope
Highest availability, reliability and safety, even for extreme process and ambient conditions

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6 Endress+Hauser
Measuring principle The radiometric measuring principle is based on the fact that gamma radiation is attenuated when it
penetrates a material. Radiometric measurement can be used for a variety of measuring tasks:
ABC
D, E FG
A0018108
A Continuous level measurement
B Point level detection
C Interface measurement
D Density measurement
E Concentration measurement (density measurement followed by linearization)
F Concentration measurement with radiating media
G Measurement of mass flow (solids)
Continuous level measurement
A source container with a radiation source and a Gammapilot FMG50 (to receive the gamma
radiation) are mounted on opposite sides of a vessel. The radiation emitted by the radiation source is
absorbed by the medium in the vessel. The higher the level rises, the more radiation is absorbed.
Consequently, the Gammapilot FMG50 receives less radiation as the level of the medium increases.
This effect is used to determine the current level of medium in the vessel. As the Gammapilot
FMG50 is available in different lengths, the detector can be used for measuring ranges of different
sizes.
Point level detection
A source container with a radiation source and a Gammapilot FMG50 (to receive the gamma
radiation) are mounted on opposite sides of a vessel. The radiation emitted by the radiation source is
absorbed by the medium in the vessel. In the case of point level detection, the radiation received by
the Gammapilot FMG50 is usually absorbed completely if the radiation path between the radiation
source and the detector is completely filled with medium. In this case, the level of the medium in the
vessel is at the set limit. The Gammapilot FMG50 indicates the uncovered state (no medium in the
radiation path) with 0% and the covered state (radiation path filled with medium) with 100%.
Density measurement
A source container with a radiation source and a Gammapilot FMG50 (to receive the gamma
radiation) are mounted on opposite sides of a pipe. The radiation emitted by the radiation source is
absorbed by the medium in the pipe. The denser the medium in the radiation path between the
radiation source and the detector, the more radiation is absorbed. Consequently, the Gammapilot
FMG50 receives less radiation as the density of the medium increases. This effect is used to
determine the current density of the medium in the pipe. The density unit can be selected from a
menu.

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Endress+Hauser 7
Density measurement to determine the mass flow
A source container with a radiation source and a Gammapilot FMG50 (to receive the gamma
radiation) are mounted on opposite sides of a pipe. The radiation emitted by the radiation source is
absorbed by the medium in the pipe. The denser the medium in the radiation path between the
radiation source and the detector, the more radiation is absorbed. Consequently, the Gammapilot
FMG50 receives less radiation as the density of the medium increases. This effect is used to
determine the current density of the medium in the pipe. The density unit can be selected from a
menu. The density signal of the Gammapilot FMG50 can be combined with the signal of a volume
flowmeter, e.g. Promag 55S, and the mass flow can be calculated from these two signals.
Additional features are required when ordering a Promag 55S for mass flow measurement:
•Order option: "Solids stream" software function (F-CHIP)
•Order option: Current input
12
3
A0038166
1 Volume flowmeter
2 Gammapilot
3 Density measurement
Concentration measurement
A source container with a radiation source and a Gammapilot FMG50 (to receive the gamma
radiation) are mounted on opposite sides of a vessel. The radiation emitted by the radiation source is
absorbed by the medium in the vessel. The denser the medium in the radiation path between the
radiation source and the detector, the more radiation is absorbed. Consequently, the Gammapilot
FMG50 receives less radiation as the density of the medium increases. This effect is used to
determine the current density of the medium in the vessel. Using the linearization function, the
corresponding concentration can be assigned to the medium density and the Gammapilot FMG50
displays concentration values. The concentration unit can be selected from a menu.
Concentration measurement with radiating media
The Gammapilot FMG50 is mounted on the side of a measuring pipe. Radiating medium is conducted
past the Gammapilot. The Gammapilot FMG50 can determine the concentration of the radiating
content in the medium based on the intensity of the gamma radiation given off by the radiating
medium.
Interface measurement
A source container with a radiation source and a Gammapilot FMG50 (to receive the gamma
radiation) are mounted on opposite sides of a vessel. If an FQG63 source container is used, the
radiation source can also be inserted into a vessel using an immersion tube. This excludes the
possibility of contact between the radiation source and the medium. The radiation emitted by the
radiation source is absorbed by the media in the vessel. The denser the medium in the radiation path
between the radiation source and the detector, the more radiation is absorbed. Consequently, the
Gammapilot FMG50 receives less radiation as the density of the medium increases. This effect is
used to determine the current density of the medium in the vessel. The Gammapilot FMG50
calculates the position of the interface layer from the intensity of the radiation received. Its value is
between 0% (lowest possible position) and 100% (highest possible position).

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8 Endress+Hauser
2
1
1
A0038167
1 Gammapilot (2 pcs)
2 Interface measurement
Measurement of mass flow (solids)
Bulk solids applications on conveyor belts and conveyor screws.
The source container is positioned above the conveyor belt and the Gammapilot FMG50 below the
conveyor belt. The radiation is attenuated by the medium on the conveyor belt. The intensity of the
radiation received is proportional to the density of the medium. The mass flow is calculated from the
belt speed and the radiation intensity.
1
A0036637
1 Gammapilot FMG50
Measuring system A radiometric measuring system typically consists of the following components:
Radiation source
A 137Cs or 60Co source acts as the radiation source. Radiation sources with different activities are
available to adapt the system to the specific application. The "Applicator" selection and configuration
program can be used to calculate the required activity 1). For additional information on the radiation
source, refer to TI00439F.
Alternatively, radiation sources with other decay constants can also be used. The decay time
can be defined as between 1 and 65536 days. Decay times for other isotopes can be found in
the "NIST Standard Reference Database 120", see:
https://www.nist.gov/pml/radionuclide-half-life-measurements/radionuclide-half-life-
measurements-data
Source container
The radiation source is enclosed in a source container, which allows the radiation to be emitted only
in one direction and screens it off in any other direction. The radiation is absorbed in all directions
when the source container is closed. The source container is opened during commissioning and the
radiation is emitted at a defined angle. This reduces the area of radioactive radiation to the
minimum required to irradiate the active part of the Gammapilot FMG50. Source containers are
available in different sizes and with different angles of emission. The "Applicator" 1) program can be
used to select the source container that suits your application. For additional information on source
containers, refer to Technical Information TI00445F (FQG60), TI00435F (FQG61, FQG62),
TI00446F (FQG63) and TI01171F (FQG66).
1) The "Applicator" CD-ROM is available from your E+H sales organization

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Endress+Hauser 9
Gammapilot FMG50
The Gammapilot FMG50 contains a scintillator, a photomultiplier and the electronic evaluation unit.
Incident gamma radiation generates light flashes within the scintillator. These pass to the
photomultiplier, where they are converted into electrical pulses and amplified. The pulse rate
(number of pulses per second) is an indicator of the intensity of the radiation. Depending on the
calibration, the pulse rate is converted to a level, limit switching, density or concentration signal by
the electronic evaluation unit. The Gammapilot FMG50 is available with NaI (Tl) crystals or with PVT
scintillators of different lengths, ensuring that it can be optimally adapted to each individual
application.
2
13
A0018244
1 Gamma radiation generates light flashes (photons) in the scintillator
2 The photomultiplier converts the flashes into electrical pulses and amplifies them
3 The electronic evaluation unit calculates the measured value from the pulse rate
Gamma Modulator FHG65 (optional)
In a radiometric measuring point with a Gammapilot FMG50, the Gamma Modulator FHG65 is
mounted in front of the radiation emission channel of the source container. It contains a shaft
slotted along the longitudinal axis. This shaft rotates continuously and alternately screens off the
gamma beam at a frequency of 1 Hz or allows it through. Due to this frequency, the useful beam
differs from fluctuating ambient interference radiation and from interference radiation occurring
sporadically (e.g. from nondestructive material testing). Using a frequency filter, the Gammapilot
FMG50 can separate the useful signal from interference radiation. In this way, it is possible to
continue measuring even if interference radiation occurs. This significantly increases the measuring
certainty and system availability. This is independent of the interference radiation isotope used.
For additional information, refer to TI00423F
3
4
1
2
A0018245
1 Interference radiation
2 Gammapilot FMG50
3 Gamma Modulator FHG65
4 Source container FQG61, FQG62
The gamma modulator FHG65 and the Gammapilot FMG50 are not interconnected electrically.
When adjusting the Gammapilot , the "Beam type" parameter must be set to "Modulated".
Signal analysis Level measurement
The device's linearization function allows the user to convert the measured value to length or volume
units. A standard linearization curve for calculating the level in vertical cylinders is preprogrammed

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10 Endress+Hauser
into the Gammapilot M. Other linearization tables of up to 32 value pairs can be entered manually or
semi-automatically. The linearization curve with its associated table can be calculated using the
"Applicator" 1) selection and configuration software.
L
L
I
I
L L
I I
AB
CD
A0018246
A Linear table
B Standard table
C, D User-specific table
I Pulse rate (pulses per second, cnt/s)
L Level (%)
Density measurement
The measured values of up to four samples of known density can be stored in the Gammapilot
FMG50 and used for the calibration of density measurements. The Gammapilot FMG50 calculates
the absorption coefficient µ and the linearization curve automatically from these values. It then uses
these parameters to calculate the density from the pulse rate. In the case of a one-point calibration, a
default value is used for the absorption coefficient µ. This value can be changed manually.
Alternatively, a second calibration point (the pulse rate in the empty pipe) can be calculated using
the Applicator. The calculated empty calibration value of the Applicator is saved in the device with
the measured one-point calibration value and the absorption coefficient µ is calculated from this.

Gammapilot FMG50
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D
A
BFs = e
-mD
r
I
I
r
r
A0018248
A One-point calibration
B Multiple point calibration
D Pipe diameter or radiated length
I Pulse rate (pulses per second, cnt/s)
FSAttenuation factor
ρ Density
µ Absorption coefficient
Concentration measurement
The Gammapilot FMG50 determines the concentration indirectly via a density measurement. A
linearization table consisting of up to 32 "density - concentration" value pairs can be entered for this
calculation. The solids content of liquids, for example, can be measured in this way (percentage of
volume or weight).
C
Ir
r
A0018249
I Pulse rate (pulses per second, cnt/s)
ρ Density
C Concentration
Concentration measurement with radiating media
The Gammapilot FMG50 calculates the concentration of the medium from the intensity of the
radiation that is emitted by the medium itself.
A source container and radiation source are not needed for the measurement

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12 Endress+Hauser
%
I
A0038876
I Pulse rate (pulses per second, cnt/s)
% Measured value
Measurement of mass flow (liquids)
The density signal determined by the Gammapilot FMG50 is transmitted to the Promag 55S. The
Promag 55S measures the volume flow; the Promag can determine a mass flow in connection with
the calculated density value.
I
r
rC
rS
1
2
rM
m
V
A0042020
 1 Mass flow measurement (m) using a density meter and a flowmeter. If the density of the solids (ρs) and
the density of the carrier liquid (ρc) are also known, the solids flow rate can be calculated.
1 Gammapilot FMG50 -> total density ( ρm) consisting of the carrier liquid and solids
2 Flowmeter (Promag 55S) -> volume flow (V). The solids density (ρs) and the density of the carrier liquid (ρc)
also have to be entered in the transmitter
I Pulse rate (pulses per second, cnt/s)
ρ Density
Measurement of mass flow (solids)
Bulk solids applications on conveyor belts and conveyor screws.
The source container is positioned above the conveyor belt and the Gammapilot FMG50 below the
conveyor belt. The radiation is attenuated by the medium on the conveyor belt. The intensity of the
radiation received is proportional to the density of the medium. The mass flow is calculated from the
belt speed and the radiation intensity.
I
r
A0042021
I Pulse rate (pulses per second, cnt/s)
ρ Density

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Endress+Hauser 13
General functions
Decay compensation
The automatic decay compensation function of the Gammapilot FMG50 compensates for the
decrease in the activity of the radiation source as a result of radioactive decay. Accurate
measurements are therefore possible over the entire operating time of the radiation source.
The following are possible:
•60Co
•137Cs
• No decay compensation
• Custom:
Decay indicated in whole days
For other elements see:
https://www.nist.gov/pml/radionuclide-half-life-measurements/radionuclide-half-life-
measurements-data
Gammagraphy detection
The Gammapilot FMG50 has a function to detect short-term interference radiation. This function
displays a message if the measurement is affected by non-destructive gammagraphic material tests
in the vicinity of the measuring point.
Excess radiation: In the event of excess radiation, the Gammapilot FMG50 automatically
switches off the evaluation of the radiation. The device checks the radiation regularly. As soon
as the Gammapilot FMG50 establishes that the radiation has normalized or no more radiation
is detected, it resumes normal operation.
Empty pipe detection: see Operating Instructions
System integration Via HART protocol
1 4 5 7
9
6 8
23
A0036169
 2 Options for remote operation via HART protocol
1 PLC (programmable logic controller)
2 Transmitter power supply unit, e.g. RN221N (with communication resistor)
3 Connection for Commubox FXA191, FXA195 and Field Communicator 375, 475
4 Field Communicator 475
5 Computer with operating tool (e.g. DeviceCare/FieldCare , AMS Device Manager, SIMATIC PDM)
6 Commubox FXA191 (RS232) or FXA195 (USB)
7 Field Xpert SFX350/SFX370
8 VIATOR Bluetooth modem with connecting cable
9 Transmitter
Operation via the service interface
• Service interface (CDI) of the measuring device (= Endress+Hauser Common Data Interface)
• Commubox FXA291
• Computer with DeviceCare/FieldCare operating tool

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14 Endress+Hauser
Operation via HART
• With Field Xpert SFX350/SFX370
• With the Commubox FXA195 and the "FieldCare" operating program
Operation via WirelessHART
SWA70 WirelessHART adapter with the Commubox FXA195 and the "FieldCare" operating program
Operation via Bluetooth LE and "SmartBlue APP"
Local operation outside the radiation path
A0039186
Input
Measured variable The Gammapilot FMG50 measures the pulse rate (number of pulses per second). This rate is
proportional to the intensity of radiation at the detector. The Gammapilot M calculates the measured
value from this rate:
• Point level (0% = "radiation path free"; 100% = "radiation path covered")
• Level (in % or selectable units)
• Position of interface (in %)
• Density (selectable unit)
• Concentration (selectable unit)
Pulse rate:
Max. 60000 cnt/s
Sensitivity The sensitivity indicates which pulse rate occurs at a local dose rate of 1 µSv/h. The sensitivity
depends on the following parameters:
• Type of scintillator
• Measuring range
• Isotope used
NaI (TI) scintillator
Sensitivity with lateral irradiation:
•137Cs: 675 [(cnt/s)/(µSv/h)] per "inch" measuring range
•60Co: 450 [(cnt/s)/(µSv/h)] per "inch" measuring range
•K2O: 10 [(cnt/s)/%K2O] per "inch" measuring range
PVT scintillator
Sensitivity with lateral irradiation
•137Cs: 10 [(cnt/s)/(µSv/h)] per "mm" measuring range
•60Co: 5 [(cnt/s)/(µSv/h)] per "mm" measuring range
Typical pulse rates A radiometric measuring point should be designed in a way such that the following pulse rates,
approximately, are obtained:
Level measurement (with empty vessel)
• 2500 cnt/s for 137Cs
• 5000 cnt/s for 60Co
Point level detection (with free radiation path)
• 500 cnt/s for 137Cs
• 1000 cnt/s for 60Co

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Endress+Hauser 15
Density, concentration, interface and mass flow measurements
• 5000 cnt/s for 137Cs
• 5000 cnt/s for 60Co
Density and concentration measurements
• Depends on the application; for more information contact Endress+Hauser Service or the "Gamma
Project Team" ([email protected])
• Applicator
https://www.de.endress.com/de/onlinetools/life-cycle-management/Planung-Engineering-
Rueckverfolgbarkeit/Applicator-Produktauswahl-Produktauslegung
An application can deliver satisfactory measurement results even if the pulse rate is higher or
lower than the values specified here. For more information contact Endress+Hauser Service or
the "Gamma Project Team" ([email protected])
Measuring range Level measurement
In the case of level measurement, the measuring range typically depends on the height of the vessel.
To cover the entire measuring range, a scintillator is used that is longer than the measuring range.
Several Gammapilot FMG50 units can be used for measuring ranges >3 m (9.84 ft).
1
A0037672
1 Gammapilot FMG50
Max. point level detection
In the case of point level detection, the measuring range is essentially at one specific point. It is
determined by the thickness of the scintillator (42 mm (1.65 in)).
1
A0036644
1 Gammapilot FMG50
Min. Point level detection
In the case of point level detection, the measuring range is essentially at one specific point. It is
determined by the thickness of the scintillator (42 mm (1.65 in)).

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16 Endress+Hauser
1
A0036646
1 Gammapilot FMG50
Density measurement
In the case of density measurement, the density measuring range is defined by the minimum and
maximum density of the measured medium.
1
A0036645
1 Gammapilot FMG50
Interface measurement
In the case of interface measurement, the measuring range is determined by the possible position of
an interface. Here, the 0% position is at the lowest possible point where the interface is to be
monitored, while the 100% position is at the highest point.
Concentration measurement with source container and radiation source
In the case of concentration measurement, the measuring range is defined by the minimum and
maximum concentration of the measured medium.
Concentration measurement with radiating media
In the case of radiating media, the measuring range is defined by the minimum and maximum
concentration of the medium.
Measurement of mass flow
For the FMG50, mass flow measurement constitutes a density measurement.
The density measuring range is defined by the minimum and maximum density of the measured
medium.
Conditions/prerequisites for applications in safety-related operation
See the Functional Safety Manual
"Slave" operating mode: in this measuring mode, the measured pulse rate is output for further
processing in a connected controller.
This mode is not permitted for "functional safety"

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Endress+Hauser 17
Output
Output signal 4 to 20 mA with HART protocol
The current output offers a choice of three different operating modes:
• 4.0 to 20.5 mA
• NAMUR NE043: 3.8 to 20.5 mA
• US mode: 3.9 to 20.8 mA
Error signal Errors occurring during commissioning or operation are signaled in the following way:
• Error symbol, error code and error description on the display module.
• Current output:
• MAX, 110%, 22 mA
• MIN, -10%, 3.6 mA
Load • Max. load: 500 Ω
• Min. load for HART communication: 250 Ω
Output damping The output damping is user-definable in the range from 0 to 999.9 s
Power connection
Supply voltage Protected against reverse polarity
• Non-Ex: 14 to 35 VDC
• Ex-i: 14 to 30 VDC
Bluetooth communication with the device is possible with a supply voltage of 14 V or higher.
The background lighting of the display is only guaranteed with a supply voltage ≥ 16 V. The
measurement function is guaranteed as of a terminal voltage of 12 V; Bluetooth
communication with the device is not possible with this voltage level, however.
If the available supply voltage drops below the aforementioned thresholds during operation, the
background lighting switches off first before the Bluetooth function is switched off in order to
guarantee the measurement function. A corresponding warning message is not displayed.
These functions are reactivated when the device is restarted and sufficient power is supplied.
Overvoltage category • Overvoltage category II
• Pollution degree II
Protection class Class 1
Potential equalization The device must be included in the local potential equalization system.
Electrical connection
Connection compartment
1
A0038877
1 Connection compartment
4 to 20 mA HART connection Connection of the device with HART communication, power source and 4 to 20 mA display

Gammapilot FMG50
18 Endress+Hauser
2
3
Y+ +
- -
I
1
mA
A0028908
 3 Block diagram of HART connection
1 Device with HART communication
2 HART resistor
3 Power supply
The HART communication resistor of 250 Ω in the signal line is always necessary in the case of
a low-impedance power supply.
The voltage drop to be taken into account is:
Max. 6 V for 250 Ω communication resistor
Terminal assignment
+
-
321
A0038895
 4 Connection terminals and ground terminal in the connection compartment
1 Internal ground terminal (to ground the cable shield)
2 Negative terminal
3 Positive terminal
• Non-Ex: supply voltage: 14 to 35 VDC
• Ex-i: supply voltage: 14 to 30 VDC
Cable entries
12
A0038156
1 Cable entry
2 Dummy plug
The number and type of cable entries depend on the device version ordered. The following are
possible:
• M20 threaded joint, plastic, IP66/68 NEMA Type 4X/6P
• M20 threaded joint, nickel-plated brass, IP66/68 NEMA Type 4X/6P
• M20 threaded joint, 316L, IP66/68 NEMA Type 4X/6P
• M20 thread, IP66/68 NEMA Type 4X/6P
• G1/2 thread, IP66/68 NEMA Type 4X/6P, with enclosed M20 to G1/2 adapter

Gammapilot FMG50
Endress+Hauser 19
• NPT1/2 thread, IP66/68 NEMA Type 4X/6P
• M12 plug, IP66/68 NEMA Type 4X/6P
• HAN7D plug, 90 deg. IP65 NEMA Type 4x
Connecting cables should be routed away from the housing from below to prevent moisture
from penetrating the connection compartment. Otherwise, a drip loop should be provided or a
weather protection cover should be used.
Please follow the enclosed installation instructions if a G1/2 entry is used.
Potential equalization Before wiring, connect the potential matching line to the ground terminal.
1
A0038024
1 Ground terminal for connecting the potential matching line
LCAUTION
‣Please refer to the separate documentation on applications in hazardous areas for the safety
instructions
For optimum electromagnetic compatibility, the potential matching line should be as short as
possible and at least 2.5 mm2 (14 AWG) in cross-section.
Overvoltage protection
(optional)
Product structure, feature 610 "Accessory mounted", option "NA"
• Overvoltage protection:
• Nominal functioning DC voltage: 600 V
• Nominal discharge current: 10 kA
• Surge current check î = 20 kA satisfied as per DIN EN 60079-14: 8/20 μs
• Arrester AC current check I = 10 A satisfied
NOTICE
Device could be destroyed!
‣Devices with integrated overvoltage protection must be grounded.
Rated cross-section Protective ground or grounding of the cable shield: rated cross-section > 1 mm2 (17 AWG)
Rated cross-section of 0.5 mm2 (AWG20) to 2.5 mm2 (AWG13)
Fieldbus connectors In the case of device versions with a fieldbus connector, the housing does not have to be opened to
establish the connection.
Pin assignment for connector M12-A
2
1
34
A0011175
Pin 1: Signal +
Pin 2: Not used
Pin 3: Signal –
Pin 4: Ground
Material: CuZn, contacts for plug-in jack and connector are gold-plated

Gammapilot FMG50
20 Endress+Hauser
Connection of devices with Harting plug Han7D
Han7D
–
+
+ –
–
+
A B
A0019990
A Electrical connection for devices with Harting plug Han7D
B View of the plug-in connection on the device
Material: CuZn, contacts for plug-in jack and connector are gold-plated