TechnicalInformationTI 180F/00/en

Operating Instructions017277-1000

ApplicationThe DG 57 scintillation detector is usedtogether with a Gammapilot or Gamma-silometer transmitter and a QG 020/100source container for level, density orinterface layer measurement as well asfor limit level detection. It is available inseveral lengths and is speciallyequipped for the application at hand.

Features and Benefits Non-contact, non-invasive and reliable

measurement independent ofchanging process conditions suchas pressure, temperature, viscosity,corrosion or fittings such as stirrers

For use with Gammapilot FTG 671,Gammasilometer FMG 573 andGammasilometer FMG 671 (P)transmitters

Highest sensitivity with the lowestsource activities: requires a muchsmaller dose rate than pointscintillators or ionisation chambers, butstill guarantees excellent statisticalaccuracy, even for short timeconstants

Active self-monitoring by referencemeasurement provides measurementsecurity and ageing compensation

Robust, withstands vibration

Lengths from 100 mm for limitdetection and density measurementto 2000 mm for level measurement

No requirement for special cabling,two-core cable is sufficient!

RFI given by redundant digital signaltransmission (plausibility check)

Backed up by many years experience:over 10000 units successfullymeasuring in all branches of industry

Radiometric MeasurementDG 57 scintillation detectors

Non-contact, non-invasive measurementHighest sensitivity with lowest source strengthSuitable for use in explosion hazardous areas

DG 57 scintillationdetectorleft: standard versionright: with water jacket

Hauser+EndressThe Power of Know How

Functional Description Rod ScintillatorsThe use of a rod scintillator for detectionof the gamma rays allows the lowestsource strengths to be used for level,separation layer and densitymeasurement as well as limit switching.

The detector comprises a rod scintillator,a photomultiplier and a control unit. Theionising radiation falling on thescintillator consists of individualparticles, so-called -quanta. Onentering the scintillator each particle isattenuated, thereby generating a tinyflash of light. A certain proportion ofthese flashes are picked up by thephotocathode of the photomultiplierwhich is mounted on the face of thescintillator rod.

The photomultiplier multiplies theelectrons released from the cathode,which are then converted into a voltagepulse. The signal processing unit thencounts all signal pulses which lie abovea pre-set threshold within a given timeinterval.

Reference Light PulseBefore the start of every measuringcycle a reference light pulse isgenerated and transmitted through thefibre optic light guide to the head of thescintillator. The flash of light travelsthrough the scintillator to thephotomultiplier, where it is multiplied.In the converter stage it is coded into adata word which is then passed onto thetransmitter.

The figure below shows the pulsediagram of the data word with its codedinformation. First to be transmitted is theself-monitoring information such asreference measurement (detectormonitoring), temperature and highvoltage supply of the photomultiplier,followed by the measurementinformation, i.e. the pulse rate. The samedata word is transmitted twice everymeasurement cycle(2 x ca. 250 ms = 500 ms), allowing aplausibility check to be made.

Self-Monitoring CircuitIn every measurement cycle, thereference pulse, temperature and pulserate are passed to the transmitter over atwo-core cable. A closed, activemonitoring circuit checks the result andensures that a message is immediatelyoutput if a detector modulemalfunctions. The reference pulse andtemperature are used by the transmitterto compensate for temperaturedependency and eliminate long-termdrift.

2

detector head withcable gland

photomultiplier

synthetic rodscintillator

stainless steel envelope

fibre opticlight guide

LED

reference pulse

electronics withtemperaturemeasurement

Schematic diagram ofDG 57 detector

volta

geV

star

tin

form

atio

n

refe

rence

info

rmat

ion

tem

pera

ture

info

rmat

ion

high

volta

ge

pulse

rate

time/sSchematic diagram ofpulse signal

Measuring System

Sensitive DetectionDG 57 Scintillation detectors are sosensitive that the natural radiation to befound at an altitude of 3.000 m is higherthan that required in a gamma typicalapplication. Thanks to this highsensitivity, a high pulse rate is availablefor signal evaluation. This reducesstatistical variations caused by physicaleffects from the source decay andensures high measuring accuracy withlower time constants.

The strength (pulse rate) of the detectorsignal increases with the surface area ofthe detector. With a length of 2000 mmand a diameter of 48 mm the rodscintillator is extremely sensitive. Fordense materials or for vessels of largediameter, the sensitivity can be doubledby connecting a second detector inparallel.

Measuring SystemThe measuring system comprises:

Transmitter- Gammapilot FTG 671 for level limitdetection or- Gammasilometer FMG 573 Z/S for

density measurement- Gammasilometer FMG 671 and

FMG 671 (P) for level andseparation

layer measurement Source container QG 020/100 with

Co 60 or Cs 137 source Scintillation detector DG 57.

3

Application Measu-ringlengthin mm

Local dose rate[Sv/h]

Sensitivitypulses/s per Sv/h

Co 60 Cs 137 Co 60 Cs 137

Limit switching(Local dose rate dependent uponresponse time, attentuation bymedium and projected service life)

100400 0.2

0.1

0.10.05

9102270

15603900

Density and separation layer(Local dose rate dependent upondensity range to be measured,path and response time)Projected values apply always tomin. density values ( min)

100400

400:

2000

ca. 7.5ca. 2.0...7.5

ca. 7.5ca. 2.0...7.5

9102270

15603900

Level(Local dose rate dependent uponresponse time and projectedservice life)

400600800

1000120015002000

1.11.00.950.830.690.550.45

0.450.40.350.30.250.20.16

2620343040704770541064608150

45005900700082009300

1110014000

see levelvalues

FMG 573 Z

A

B

C

E

E

+

-

1

2

+mA-

GAMMASILOMETERENDRESS + HAUSER

1

2

0 12

3456

7

89

Example of a measuringsystem: Densitymeasurements

source containerQG 020/100

transmitterFMG 573 Z/S

rod detectorDG 57

Minimum dose rate fordifferent applications

Installation Level, Density and Interface LayerMeasurementThe DG 57 detector is delivered withmounting clamps and is usually installedvertically along the vessel wall.

For measuring ranges greater than2 m, two or more detectors must beconnected in cascade

When impacts and vibrations are to beexpected, the measuring systemshould not be attached to the vessel.

If the ambient temperature exceeds+50 C (122 F), install a detector witha water jacket.

Limit Value DetectionFor limit value detection, it is usual tomount the detector horizontally on thevessel wall.

The DG 57/100 mm scintillationdetector has been especially designedfor this task

4

Minimum limitdetection

Maximum limitdetection

Level measurement(with head at top)

Level measurementwith two detectors

Limit detection Continuous

level measurement Measurement of

separation layers Density measurement

2

1

FMG 671

VH0 0

VV

++

EE

1A1A1B1B

++

__

HH

mA

0 50 100

FMG 671

VH0 0

VV

++

EE

1A1A1B1B

++

__

HH

mA

0 50 100

Electrical Connection The DG 57 is connected to the FTG 671,FMG 671 (P) or FMG 573 Z/S transmitterby means of standard 2-core installationcable, max. resistance per core 25 .The connection diagrams are shownbelow.

For the FMG 573 S:

explosion protection [EEx d ib] IIC isreached with a Zener barrier

connections for density measurementwith simultaneous temperature or flowmeasurement can be taken from theoperating manual BA 107F.

5

12

12

(+)(-)1

2

explosion hazardous area

DG 57 FMG 573 Snot certified

EExib IICRmax=25Ohm

Umax=15.8 VImax=75 mARI=7.5 Ohm

potential equalisation (German practice)

d2 (+)d4 ()

(+)(-)1

2

12

2

1

FTG 671FMG 573 Z*FMG 671

DG 57 Standard andEEx ib IIC T6*

d2 (+)d4 ()

*For FMG 573 ZEEx ib IIB T6

12

12

2

1

12

1

2

2

1

detector 2DG 57

detector 1DG 57

ground

ground

explosion hazardousarea

safe area

safety barrierGHG 111 9133V1503made by ABB

FMG 671 (P)

Standard and EEx ib IIC T6

EEx ib IIC with safety barrier

d2 (+)d4 ()

d2 (+)d4 ()

FMG 671 (P)Connection of two DG 57detectors to twoFMG 671 (P) transmitters

Connection of DG 57 toFMG 573 S whendetector located inexplosion hazardousareas IIC

Electrical connection forDG 57 FTG 671 andDG 57 FMG 573 Zand DG 57 FMG 671

Technical Data

Construction Housing:

acid resistant stainless steel, SS 304 Protection: IP 65 to DIN 40 050 Cable gland:

WADI A PG 16, M 20 x 1.5 or G 1/2" Fittings supplied:

of acid-resistant stainless steel, SS 3042 clamps for lengths < 800 mm3 clamps for lengths > 1000 mm

Water cooling jacket Material:

acid-resistant, stainless steel, SS 304 Water connection:

2 G1/4" A to DIN ISO 228 Flow rate: 40200 l/h max. water temperature 40 C water pressure 4...6 bar.

Operational data Permissible ambient temperature:

20 C+50 C+40 C+120 C with water jacket. Inexplosion hazardous areas note theinstructions of the appropriate XA(s.p.8)

Interference Emission to EN 61326;Electrical equipment Class BInterference Immunity to EN 61326,Annex A (Industrial) and NAMURRecommendation NE 21 (EMC)

Sensitivity control and operabilitymonitor: automatic, by means ofreference pulses

Certificate:EEx d ib IIC T6 / ATEX II 2 GEEx d / ATEX II 2 GEEx de / ATEX II 2 GFor FMG 573 S, IIC obtainable withsafety barrier only

Output:PCM signal, base current of 50 mA13.3 V with superimposed pulses ofca. 15 mA of duration ca. 200 s

Measurement precision:typically 12 % for level, interfacelayer or limit detection applications.For density measurement statisticalprecision 0.0001 g/cm3 as a functionof range, path length and timeconstant for 7.5 Sv/h at detector.

6

Measuring length A Overall length B(+ 10 mm with waterjacket)

Weight Weight with jacket

100 mm (4") 773 mm (30") 12.6 kg (27.7 lb) 18.0 kg (39.6 lb)400 mm (16") 1073 mm (42") 14.0 kg (30.8 lb) 19.5 kg (42.9 lb)600 mm (24") 1273 mm (50") 15.0 kg (33.0 lb) 21.5 kg (47.3 lb)800 mm (32") 1473 mm (58") 16.3 kg (35.9 lb) 24.2 kg (53.2 lb)

1000 mm (40") 1673 mm (66") 17.5 kg (38.5 lb) 26.2 kg (57.6 lb)1200 mm (48") 1873 mm (74") 18.8 kg (41.4 lb) 28.4 kg (62.5 lb)1500 mm (60") 2173 mm (86") 20.4 kg (44.9 lb) 31.5 kg (69.3 lb)2000 mm (80") 2673 mm (105") 24.0 kg (52.8 lb) 37.0 kg (81.4 lb)

Dimensions of detectorDG 57 in mm1" = 25.4 mm

Dimensions and weightsof DG 57 detectors

Dimensions of waterjacket in mm1" = 25.4 mm

overall length B, see table belowmeasuring length A

11

0

80

ca. 500

100

144

12

10

8

20

120ca. 500

11

0

177

overall length B + 10, see table below

measuring length A

146

12

Clamping devices

Clamping devicesThe following methods are available: Clamping devices for piping

DN 80340, Type 013336 Clamping devices for piping

DN 340820, TSP 013252 Rigs for measuring density or interface

layers in tanksType 013131-0000 or 013131-0001

coated measuring pipes, fittings fordiagonal beams through piping,clamps for pipes > DN 820 orcomplete measuring paths with smallpipe diameters on request.

7

Left:Positioning for diagonalbeam, clamping deviceTSP 015354 forDN 80200

Right:Rig 013131-0000/1 fordensity measurement invessels

Positioning for normalbeam

Clamping devicedimensions (mm) typeTSP 013 336/013 252

Product structure forclamps

Clamping devices for density measurementNominal diameter1 80340 mm TSP 0133362 340820 mm TSP 0132523 80200 mm for diagonal radiation 30 with small diameters TSP 0153544 120...300 mm for diagonal radiation 45

Material, clampsA Steel, epoxy lacqueredB Steel, galvanised

Material, mounting material1 Steel, galvanised

KLEMM- complete product designation

40

Type 013 336 013 252DN 80340 340820A mm 565 560B mm 410 900C mm approx. 300 approx. 300D mm 87 117E mm 150 280F mm 465 480G mm M16 M20

F A E

C

D

B

G

DN

Product Structure

SupplementaryDocumentation

Gamma MeasurementsSI 016F/00/en or PK 001F/00/en

Gammapilot FTG 671Technical Information TI 177F/00/en

Gammasilometer FMG 671Technical Information TI 219F/00/en

Radiometric Density Measurementwith Gammasilometer FMG 573 ZTechnical Information TI 110F/00/en

Gamma Radiation SourcesTechnical Information TI 213F/00/en

Source containers QG 020/100Technical Information TI 264F/00/en

Source container QG 2000Technical Information TI 346F/00/en

TI 180F/00/en/07.03017277-1000CCS/CV8.0

Detector DG 57Certificate/ApprovalR for Ex-free areaA ATEX II 2G / EEx d ib IIC T6, s. XA 057F-AH ATEX II 2G / EEx d IIC T6, s. XA 057F-AM ATEX II 2G / EEx de IIC T6, s. XA 057F-AD ATEX II 2D IP65 T60C, s. XA 112F-AV TIIS, EExd IIC T6

Material1 Stainless steel tube, SS 304

Measurement lengthH 100 mmA 400 mmB 600 mmC 800 mmD 1000 mmE 1200 mmF 1500 mmG 2000 mmP 100 mm, with water jacketR 400 mm, with water jacketS 600 mm, with water jacketT 800 mm, with water jacketU 1000 mm, with water jacketV 1200 mm, with water jacketW 1500 mm, with water jacketQ 2000 mm, with water jacket

Electrical connection2 Cable entry 1/2" NPT (for certificate H only)3 M20x1.5 (for certificate H only)4 G 1/2" (for certificate H only)5 M20x1.5 gland (for certificates A, M and D only)

ApplicationA For level measurement with FMG 573 Z/S (not 100 mm)B For density measurement with FMG 573 Z/S (only 100/400 mm)C For limit switching with FTG 671 (only 100/400 mm)D For level measurement with FMG 671(not 100 mm)

Radiation source1 Cs 137 source2 Co 60 source3 Co 60 and Cs 137 source

DG57- complete product designation

Hauser+EndressThe Power of Know How

05.02/PT1

Endress+HauserGmbH+Co. KGInstrumentsInternationalP.O. Box 2222D-79574 Weil am RheinGermany

Tel. (0 76 21) 9 75-02Fax (0 76 21) 9 75-3 45http://www.endress.cominfo@ii.endress.com

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