Endress+Hauser FHG65 Manual

Effective suppression of background radiation and
extraneous radiation at the Gammapilot
Application
•Gamma Modulator FHG65
Improvement of the measurement results of radioactive measurement through the
effective suppression of background radiation and extraneous radiation
•Synchronizer FHG66
Synchronization of an unlimited number of Gamma Modulators FHG65 and
operating status display for easy diagnosis of the connected Modulators FHG65.
Advantages
• Disturbance-free measurement in the event of interference radiation and variable
background radiation
• Easy mounting and integration into existing systems
• No maintenance required
Products Solutions Services
Technical Information
Gamma Modulator FHG65
Synchronizer FHG66
Radiometric measuring technology
TI00423F/00/EN/15.22-00
71560003
2022-02-22

Gamma Modulator FHG65 Synchronizer FHG66
2 Endress+Hauser
Table of contents
About this document ........................ 3
Symbols used ................................ 3
Function and system design ................... 3
System design ................................ 3
System requirements ........................... 3
Gamma Modulator FHG65 ....................... 4
Synchronizer FHG66 ........................... 4
Cascading multiple Synchronizers FHG66 ............. 5
Gamma Modulator FHG65 .................... 6
Technical data ............................... 6
Electrical connection ........................... 8
Installation requirements ........................ 9
Mechanical construction ........................ 11
Ordering information .......................... 13
Synchronizer FHG66 ........................ 14
Technical data .............................. 14
Electrical connection .......................... 15
Installation requirements ....................... 16
Mechanical construction ........................ 17
Human interface ............................. 17
Ordering information .......................... 19
Certificates and approvals ................... 19
CE mark ................................... 19
Explosion protection .......................... 19
Additional approvals .......................... 19
Overfill protection ............................ 19
Other standards and guidelines ................... 19
Supplementary documentation ............... 19
Gamma Modulator FHG65; Synchronizer FHG66 ........ 19
Source container FQG61, FQG62 .................. 19
Radiation source FSG60, FSG61 ................... 20
Other documentation .......................... 20

Gamma Modulator FHG65 Synchronizer FHG66
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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
Function and system design
System design A measuring point with the Gamma Modulator FHG65 consists of the following components:
• Gamma Modulator FHG65
• Gammapilot FMG50 or Gammapilot M FMG60
• Source container FQG61 or FQG62
• Radiation source 137Cs or 60Co (installed in the source container)
• If multiple Gamma Modulators are used or for diagnostic purposes: Synchronizer FHG66
System requirements System requirements of FMG50
All versions of the Gammapilot FMG50 can evaluate the signal generated by the Gamma Modulator
FHG65

Gamma Modulator FHG65 Synchronizer FHG66
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System requirements of FMG60
To be able to evaluate the signal generated by the Gamma Modulator FHG65, the Gammapilot M
FMG60 must be equipped with the following software at least:
• HART electronics
• For SIL devices with short point level detectors (200 mm and 400 mm): SW 01.02.02 or higher
• For all other devices: SW 01.03.02 or higher
• PROFIBUS PA electronics
SW 01.03.02 or higher
• FOUNDATION Fieldbus electronics
SW 01.03.02 or higher
Gamma Modulator FHG65 In a radiometric measuring point, the Gamma Modulator FHG65 is mounted in front of the beam
exit channel of the source container. It contains a shaft slotted along the longitudinal axis. This shaft
rotates continuously and alternately screens off, or allows through, the useful beam at a frequency of
1 Hz. 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 FMG50 or FMG60 can thus 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.
3
4
1
2
A0018245
1 Interference radiation
2 FMG50/FMG60
3 FHG65
4 FQG61/FQG62
The Gamma Modulator FHG65 and the Gammapilot FMG50/FMG60 are not interconnected
electrically. When adjusting the FMG50/FMG60, the "beam type" parameter must be set to
"modulated".
Synchronizer FHG66 In a measuring point with multiple radiation sources, a Gamma Modulator FHG65 must be mounted
on every source container. The Synchronizer FHG66 synchronizes the individual modulators to
common mode. A Synchronizer FHG66 can synchronize up to three Gamma Modulators FHG65. (For
more than three modulators, see the "Cascading multiple Synchronizers FHG66" section). In addition,
the synchronizer offers a straightforward diagnostic solution for the connected Modulators FHG65,
which is beneficial when only one Modulator FHG65 is in operation.

Gamma Modulator FHG65 Synchronizer FHG66
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18...3 VDC5
1
1
4
2
3
A0018540
1 FHG65
2 Electrical connection between FHG66 and FHG65 (1)
3 Electrical connection between FHG66 and FHG65 (2)
4 FHG66
It is recommended to install the switch for the supply voltage near the device and to mark it as
a disconnector for the device.
Use of the Synchronizer FHG66, and particularly of its alarm output, is recommended for
minimum point level detection, as an undetected failure of the Modulator FHG65 may result in
faulty switching behavior
1
1
1
1
2
2
A
B
A0021133
A Maximum point level detection
B Minimum point level detection
1 FHG65
2 FHG66
Cascading multiple
Synchronizers FHG66
If more than three radiation sources are used, the synchronization chain must be extended by
cascading: here, an additional synchronizer (3) is connected to one of the outputs of the
synchronizer (2) instead of a modulator. All connected Gamma Modulators then operate in common

Gamma Modulator FHG65 Synchronizer FHG66
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mode. By interconnecting this cascading function, any number of modulators can be synchronized
with one another.
32
SYNC1
SYNC3CASC IN
SYNC1
SYNC2
SYNC3
SYNC2
18...35 VDC
1
1
1
1
1
18...36 VDC
18...36 VDC
18...36 VDC
18...36 VDC
18...36 VDC
A0018541
1 FHG65
2 Primary synchronizer
3 Cascaded synchronizer
Gamma Modulator FHG65
Technical data Power supply
• Supply voltage: 18 to 36 VDC
• Power consumption: 3.2 W
• Overvoltage category: II
• Protection class: 1
• Potential equalization: provided

Gamma Modulator FHG65 Synchronizer FHG66
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Alarm output
The Gamma Modulator FHG65 does not have an alarm output of its own. Operating errors are
reported as follows:
•If a Synchronizer FHG66 is connected: The FHG65 reports the error to the FHG66 via the
synchronization input. The alarm relay of the FHG66 reports the error.
•If a Synchronizer FHG66 is not connected: The FHG65 switches off its motor completely in the
event of an error. This reduces the current consumption to less than 30 mA. This can be detected
by an external current monitor (e.g. Dold IK9076.11)
IK 9076.11
DC 24V
< 0.1 A
A1 +/i
DC 24V
11
k
L-
A2’-
1412A2-
L+
FHG65
0V
A0018539
 1 Connection diagram for external current monitor Dold IK9076.11
Environment
•Ambient temperature:
• Without water cooling: –40 to +60 °C (–40 to +140 °F)
• With water cooling at the water cooling jacket: 0 to +120 °C (32 to +248 °F)
• With water cooling at the terminal head: max. +75 °C (+167 °F)
•Storage temperature: –40 to +75 °C (–40 to +167 °F)
•Housing degree of protection: IP66/67; TYPE 4X/6
•Climate class: DIN EN 60068-2-38 test Z/AD
•Vibration resistance: DIN EN 60068-2-64 test Fh; 10 to 2 000 Hz, 1 (m/s2)2/Hz
•Shock resistance: DIN EN 60068-2-27; test Ea; 30 g, 18 ms, 3 shocks /direction/axis
•Electromagnetic compatibility: Interference emission according to EN 61326, Appendix A
(Industrial) and NAMUR Recommendation NE21
Interference suppression
FMG50
Max 5 µSv/h per 1 000 mm (39.4 in) measuring length:
• Measuring range 200 mm (7.87 in): 25 µSv/h max. interference suppression
• Measuring range 800 mm (31.5 in): 6 µSv/h max. interference suppression
• Measuring range 2 000 mm (78.7 in): 2.5 µSv/h max. interference suppression
• Measuring range 10 000 mm (394 in)- cascading: 0.5 µSv/h max. interference suppression
FMG60
Max 10 µSv/h per 1 000 mm (39.4 in) measuring length:
• Measuring range 200 mm (7.87 in): 50 µSv/h max. interference suppression
• Measuring range 800 mm (31.5 in): 12.5 µSv/h max. interference suppression
• Measuring range 2 000 mm (78.7 in): 5 µSv/h max. interference suppression
• Measuring range 10 000 mm (394 in)- cascading: 1 µSv/h max. interference suppression

Gamma Modulator FHG65 Synchronizer FHG66
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Electrical connection Connection compartment
1
2
3
*
*
A0018536
1 Cover of the connection compartment
2 Ground terminal on modulator
3 Ground terminal on water cooling jacket
Cable entries
Versions of the two cable entries (for supply voltage and synchronization connection)
• M20 gland
• M20 thread
• G ½ thread
• NPT ½ thread
Terminal assignment
L+
(1)
L-
(2)
+
(3)
-
(4)
18-36 VDC
SYNC IN
A B
L+
(1)
L-
(2)
+
(3)
-
(4)
18-36 VDC SYNC IN
A0018538
A Ex d, Ex t, non-Ex - version
B Ex de - version
• Terminal 1 (L+): supply voltage; 18 to 36 VDC
• Terminal 2 (L-): supply voltage; 18 to 36 VDC
• Terminal 3 (SYNC+): synchronization connection (to connect the Synchronizer FHG66); 12 VDC,
5 mA
• Terminal 4 (SYNC-): synchronization connection (to connect the Synchronizer FHG66); 12 VDC,
5 mA
• Install a circuit breaker in the power supply line
• Use a cable with a minimum diameter of 0.5 mm2 (20 AWG)
• Mount the earth tag of the ground connector in the position direction indicated in the
graphic

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Installation requirements General installation conditions
The Gamma Modulator FHG65 is mounted directly on the mounting flange of the source container
FQG61 or FQG62. 1)
LCAUTION
‣As the beam exit channel is not located in the middle of the source container, it is absolutely
essential to ensure the device is oriented correctly when mounting. The arrow on the mounting
plate of the Gamma Modulator must point in the direction of the transporting lug of the source
container. Measurement is not possible otherwise.
A0018532
• The source container with the Gamma Modulator must be mounted as close as possible to the tank
or measuring tube
• The unit must be mounted on a low-vibration construction
• Fasten with at least 4 M16 threaded bolts; torque:
• Steel: 210 Nm (154.88 lbf ft)
• Stainless steel: 144 Nm (106.20 lbf ft)
• When mounting, consider the total weight consisting of the source container and the Gamma
Modulator FHG65. Ensure sufficient stability is guaranteed. Provide an additional support if
necessary
• After mounting, measure the local dose rate in the vicinity of the source container and the Gamma
Modulator. Cordon off any controlled areas, see also TI00435F (FQG61/FQG62)
• The use of the modulator reduces the effectively useful horizontal angle of the beam path from 6 °
to approx. 2 °. Check that the detector is completely covered by the radiation beam!
Mounting multiple Gamma Modulators FHG65
If multiple Gamma Modulators FHG65 are used in a measuring point, they must operate
synchronously. The Synchronizer FHG66 is used for this purpose.
The synchronization requires that all the Gamma Modulators FHG65 be aligned in the same
way. A mark is provided at the top of the Gamma Modulator FHG65 to align the units. This
mark must be aligned in the same way relative to the source container on all the Gamma
Modulators FHG65 used.
1) For applications with the source container FQG66: contact your local Endress+Hauser sales office

Gamma Modulator FHG65 Synchronizer FHG66
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1
2
1
2
A0018533
1 Marking for aligning multiple Gamma Modulators
2 FHG65
Water cooling
The following applies to the Gamma Modulator FMG60 version with water cooling:
• Material: 316L and 304
• Water connection: 2 x G 1/4"A, DIN ISO 228
• Outlet temperature: max. +40 °C (104 °F); temperature monitoring is recommended
• Water pressure: 4 to 6 bar (58 to 87 psi)
• Water flow: min. 60 l/h
• Drain sensor with water cooling jacket in the event of frost or protect against freezing.
1
1
22
A0018535
1 FQG61, FQG62
2 FHG65
LCAUTION
‣The water must always be introduced from the bottom to ensure that the water cooling jacket is
completely filled.