Endress+Hauser FHG65 Handbuch

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

Endress+Hauser 3

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

4 Endress+Hauser

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.

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

Endress+Hauser 5

18...3 VDC5

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

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

6 Endress+Hauser

mode. By interconnecting this cascading function, any number of modulators can be synchronized

with one another.

SYNC1

SYNC3CASC IN

SYNC1

SYNC2

SYNC3

SYNC2

18...35 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

Endress+Hauser 7

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

L-

A2’-

1412A2-

L+

FHG65

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

8 Endress+Hauser

Electrical connection Connection compartment

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

Gamma Modulator FHG65 Synchronizer FHG66

Endress+Hauser 9

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

10 Endress+Hauser

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.

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.

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