Endress+Hauser Gammapilot FTG 671 Manual

Technical

Information

TI 177F/00/en

Application

The Gammapilot FTG 671 transmitter is

designed for

•non-invasive, level limit detection

in containers - mixers, reactors,

hoppers, silos, tanks - with inflammable,

abrasive, poisonous and aggressive

bulk material and liquids, e.g. in acid

tanks, boilers, cement silos, ballast

hoppers, cyclones, cupolas, rotary

furnaces etc.. Thanks to the fact that the

measuring system is fitted externally, it

also finds application in the food

processing industry.

Gammapilot transmitters may also be

used for applications in explosion

hazardous areas, and possess

intrinsically-safe sensor circuits

conforming to EEx ib IIC, or EEx d IIC,

EEx de IIC depending on the detector.

Features and Benefits

•Suitable for scintillation detector

DG 57 or Geiger-Müller counters

DG 17 or DG 27

•Uses lowest possible source activity

with DG 57/100 mm or longer

•Digital signal transmission

- Interference-free function with

two-core installation cable up to

1000 m

•Intrinsically safe sensor circuits

- Ex-protection withoutZener barriers

approved as overspill protection

(VBF, WHG Germany) and for use

in explosion hazardous areas

•Simple operation with parameter

matrix

- Uniform handling as for all

Commutec transmitters

•Practical background functions

- Automatic compensation of source

decay

- Automatic adjustment of switch

point

•Commutec transmitter

- Simple connection to automatic

systems via Rackbus

- Up- and download of data

Radiometric Level Measurement

gammapilot FTG 671

Non-invasive, radiometric limit detection

Intrinsically safe signal circuit [EEx ib] IIC /

ATEX II (2) GD

For scintillation or Geiger-Müller detector

The Gammapilot

FTG 671 transmitter is a

19" plug-in card, shown

here in Monorack II

housing

Hauser+Endress

The Power of Know How

Measuring System

A working system for level limit detection

comprises:

•Gammapilot FTG 671 transmitter,

•QG 020 or QG 100 source container

with Co 60 or Cs137 gamma source

•DG 17, DG 27 Geiger-Müller counter

or DG 57 scintillation counter.

Scintillation Counter DG 57

Most measurement systems use the DG

57 scintillation counter, thus ensuring:

•highest sensitivity

•with lowest source strength.

Endress+Hauser have many years of

experience with rod scintillation counters

and the new DG 57/100 mm counter has

been specially developed for limit

detection. Sensitivity can be further

increased by using the DG 57/

400 mm or longer.

Signal Input Circuit

The Gammapilot supplies the power to

the DG… detector and, depending on

type, the detector returns an

interference-free pulse frequency or

pulse code modulated countrate signal.

The intrinsically safe signal input is

electrically isolated from the transmitter

supply and the outputs.

Output Signals

The Gammapilot FTG 671 has two limit

relays which can be operated with freely

adjustable hysteresis independently of

each other in minimum or maximum

fail-safe mode.

Self-Monitoring Function

The Gammapilot FTG 671 continuously

monitors all signal lines. On fault

condition:

•An alarm relay with potential-free

changeover contact de-energises

•In default condition the limit relays also

de-energise.

Standard level detection

application showing the

arrangement of the

system components

source container,

detector and transmitter

FTG 671

Vibration

channel

Maximum

level

detection

Minimum

level

detection

Feed rate 1

barrel/2s

Full move

forward

Half full are

rejected

FTG 671 Filling

station

Conveying limestone

Gamma radiation

barriers control the

drying process

Automatic filling of beer

barrels

The level is checked as

the barrels move past

the barrier

Min./max.

relays

Gammapilot

FTG 671

transmitter

Source Detector

Measurement Principle

Gamma-Ray Absorption

Radiometric level measurement relies on

the fact that gamma rays are absorbed

as they penetrate a material. The

attenuation of the radiation is dependent

upon the density ρ, the thickness d of

the material as well as the linear

absorption factor µ. This in turn is

dependent on the material and gamma

source. The attenuation is calculated

from the formula

Fs= e µ . ρ . d

The radiation also decreases with the

square of the distance between source

and detector.

Limit Detection

For limit detection µ, and d are

constants and the detected radiation

level depends upon the presence or not

of the penetrated material:

•The countrate is at a maximum when

the path to the detector is completely

free and

•at a minimum when all the radiation

has to travel through the material and

is attenuated.

The maximum and minimum countrates

Nmax and Nmin are obtained when the

transmitter is calibrated, whereby their

dependency is given by:

Nmin = Nmax e−µ . ρ . d

The switch points can be set anywhere

within these two countrates, which are

normalised to produce the end values 0

and 100.

Radiation Statistics

The emission of gamma rays by a

radioactive source is governed by the

laws of statistics. For this reason the

measurement precision of gamma

systems is dependent on the statistical

variation in countrate. The variance, i.e.

the degree of variation between

measurements, depends upon the time

interval chosen. The precision of the

measurement depends on the chosen

confidence level - 1σ, 2σor 3σ. For a

countrate of N pulses per second:

•σ=N;±68.28 % confidence

level

•2= 2N;σ± 95.48 % confidence level

•3= 3N;σ± 99.74 % confidence level

Normally, a confidence level of 2σis

used. The statistical variation can be

reduced by increasing the sampling or

integration time τ:

Statistical variation =2N±

For limit switching the integration time

corresponds to the response time of the

relay.

Background Functions

The Gammapilot FTG 671 is equipped

with a number of background functions

which ensure accurate and reliable limit

switching. Thus, for example, the

statistical fluctuations in countrate and

decay of the gamma source described

above are accounted for without any

action on the part of the operator.

After calibration, the FTG automatically

sets the switch points to preset values. It

warns the operator if incorrect limits are

entered, and when the activity of the

source is no longer sufficient for reliable

switching.

Statistical fluctuation

in countrate

Change in countrate

as product moves

through barrier

Countrate due to residual

and background

radiation

time

Countrate

Nmax

Nmin

1000

Principle limit detection

by gamma radiography

Operation

Configuration at Front Panel

Gammapilot FTG 671 transmitters can

be configured at the front panel.

•Six keys access a parameter matrix,

defined by a vertical (V) and horizontal

(H) position, in which relevant data can

be entered

•The selected matrix field and

parameter are indicated in the

LC-display

•A display of normalised countrate,

0-100, is available during operation

Remote Configuration

The transmitter can also be configured

by a Commulog handheld terminal or via

the Rackbus.

•The Commulog is plugged into the

front panel

•The data exchanged are displayed

with supplementary information in

plain language on the large

LC-display.

When the Commulog is unplugged,

Racksyst operation mode is selected

automatically.

Operational Status

The operational status of the transmitter

is indicated by means of six LEDs which

can be clearly seen from a distance.

•The green and red LEDs in the central

field indicate the limit relay status:

red de-energised, green energised

•The green LED below lights when the

Gammapilot is communicating with the

Commulog VU 260 Z handheld

terminal or the ZA 67… computer

gateway

•The red LED in the diagnostics field

flashes to indicate a warning or lights

on fault condition.

Diagnosis

The following possibilities exist for

on-line diagnosis:

•an error code can be read from the

matrix position V9H0: the associated

text can be read with the Commulog

VU 260 Z.

•the transmitter can be connected to a

personal computer via commissioning

and service software, e.g.,

Commutool.

Measured value display showing

normalised countrate at V0H0

Limit relay LEDs

• Red lit, relay de-energised

• Green lit, relay energised

Parameter entry keys

Alarm relay LED

• Lights on fault condition,

alarm relay de-energises

• Flashes on warning,

alarm relay remains energised

Matrix selection keys

Communication sockets for

Commulog VU 260 Z

Green communications LED

• Lights when communicating

Matrix position indicator

Front panel of

Gammapilot FTG 671

showing configuration

and display elements

The Commulog VU 260 Z

provides instant access to

measured data

Remote Control

Process Control Systems

Gammapilot FTG 671 transmitters are

easily integrated into supervisory control

systems.

•Parameters are addressed over the

Rackbus by the ZA 67… gateway

which presents them in appropriate

format to the connected network

•Up to 64 Commutec transmitters (max.

128 measuring points) can be

individually controlled and operated

on-line from the control room. Each is

accessed via a unique address

•Gateways and operating programs are

available for a variety of fieldbuses,

programmable logic controllers (PLC),

process control systems (PCS) and

personal computers (PC).

The resulting dialogue between

supervisory controller and subordinate

transmitters makes for a safer and more

flexible plant organisation.

e.g.

PROFIBUS

PROFIBUS-compatible

programmable logic

controller

Rackbus

Personal Computer

or other controller or configurator

e.g.

ZA 673

Sensors Actuators

The Gammapilot

FTG 671 communicates

with a supervisory

controller via the

two-core Rackbus and a

ZA 67… computer

gateway

Three possibilities exist:

Modbus, Profibus or FIP.

Commutec operating

programs provide an

overview of process

variables for small and

medium-sized plants

Installation Mounting

Racksyst plug-in cards must be installed

outside explosive hazardous areas in a

rack or protective housing.

Endress+Hauser can provide the

following alternatives:

•19" rack (84 HP wide) for mounting up

to 12 transmitters in the control room

•Half 19" wide field housing with

Protection IP 65 for five 7 HP

transmitters and a power supply unit

•Monorack II housing (7 HP) for single

or multiple mounting on a local control

panel.

For EMC reasons we advise you to use

special guide rails with metal clips when

the plug-in card is installed in the field

housing or subrack. This connents the

instrument input filter to the subrack

potential.

Field housing

Detector Connection

•Use two-core installation cable,

max. resistance 25 Ωper core

•Use shielded cable: ground at the

detector end if electromagnetic

interference is to be expected.

•Note local regulations when laying

cable in hazardous areas.

Connection of Instrumentation

The circuit zero of the Gammapilot is

connected to the negative terminal of

the 24 V supply. One of two electrically

isolated signal inputs can be used:

•Inputs d2 and d4 are for PCM signals

from DG 57 scintillation counters

•Inputs z2 and z4 are for PFM signals

from Geiger-Müller counters DG 17

resp. DG 27.

Monorack II housing

Relay 1

Alarm relay

Power supply

Relay 2

Relay 1

Relay 2

Alarm relay

Non Ex-area

DC supply

Ex-area

Rackbus

Inputs or

PCM

PFM

Non Ex-area

Connection diagram for

Gammapilot FTG 671

Remote dialog

Technical Data

Environment

•Operating temperature: 0 °C...+70 °C

•Storage temperature: -20 °C...+85 °C

•Climatic class to DIN 40 040: KSE

•Electromagnetic compatibility (EMC):

Emitted interference to EN 61326;

Class A equipment;

Immunity to interference to EN 61326;

Annex A (industry sector) and

NAMUR EMC Recommendation

(NE 21)

Construction

•Design: 19", 7 HP, Racksyst II* plug-in

card to DIN 41 594 (Europa card)

•Front panel: black synthetic with blue

field inlay, grip and markings

•Ingress protection (DIN 40 050):

Front panel IP 20

Card IP 00

•Dimensions: see diagram

•Weight: approx. 0.3 kg

•Multipoint plug: conforming to

DIN 41612, Part 3, Type F (25-pole)

Coding pins in positions 2 and 7

Electrical Connection

•Power supply: 24 V DC (+6 V…-4 V);

- residual ripple 2 V, within tolerance

•Supply current: max. 135 mA

•Power consumption:

max. 3.3 W at 24 V, max. 4.0 W at 30 V

•Signal inputs:

Electrically isolated from the rest of the

circuitry.

- Protection EEx ib IIC, EEx d IIC or

EEx de IIC for DG 57.

Non-Ex for DG17/27.

Relay Outputs

•Two independent limit relays each with

a potential-free change-over contact

•Freely selectable switchpoint and

hysteresis

•Fail-safe mode: maximum or minimum

selectable

•Third alarm relay with potential-free

change-over contact for fault

indication

•Max. switching capacity:

- 2.5 A, 250 VAC,

- 300 VA (cos ϕ= 0.7),

- 600 VA (cos ϕ= 1)

- or 100 VDC, 100 W

Detectors

•DG 57 rod scintillation counter

•DG 17, DG 27 Geiger-Müller counters

Certificates

•Explosion protection: [EEx ib] IIC /

ATEX II (2) GD

PTB No. Ex-93.C.2145 X

•Explosion protection: EEx d ib IIC,

EEx d IIC and EEx de IIC,

dependent upon detector DG 57

PTB No. Ex-85/2051

•Overspill protection (Germany)

Dimensions in mm of

plug-in card

1" = 25.4 mm

*Type II Racksyst cards cannot be installed

in Type I Monorack housings

Product Structure

❑Radiometric measurement

Applications in all industries

Practical know-how PK 001F/00/en

❑Gammapilot, Gammasilometer

System Information SI 014F/00/en

❑Gammapilot FTG 671

Operating instructions BA

082F/00/en

❑Racksyst planning hints for rack-

mounting or Racksyst field housings

and self-adhesive connection

schematics

❑Monorack II System Housing

Technical Information TI 183F/00/en

❑QG 020/100 Source Containers

Technical Information TI 264F/00/en

❑QG 2000 Source Container

Technical Information TI 346F/00/en

❑DG 57 Scintillation Counters

Technical Information TI 180F/00/en

❑Gamma radiation source

Technical information TI 213F/00/en

❑Commulog VU 260 Z Handheld

Terminal

Technical Information TI 140/00/en

❑ZA 672 Modbus Gateway

Technical Information TI 148/00/en

❑ZA 673 PROFIBUS Gateway

Technical Information TI 162F/00/en

❑ZA 674 FIP Gateway

Technical Information TI 167F/00/en

❑Commutec Operating Program

Technical Information TI 113/00/en

TI 177F/00/en/06.03

SL/CV8.0

05.02/PT1

Endress+Hauser

GmbH+Co. KG

Instruments

International

P.O. Box 2222

D-79574 Weil am Rhein

Germany

Tel. (0 7621) 975-02

Fax (076 21) 975-3 45

http://www.endress.com

[email protected].com

Hauser+Endress

The Power of Know How

Gammapilot FTG 671

Certificate

F [EEx ib] IIC*/ATEX II (2) G

Approval for use as overspill protection (Germany)

Version

A Single measurement point

EEx d ib IIC, EEx de IIC, EEx d IIC are determined by the DG 57 detector

Non-Ex for DG 17/27

product designation

FTG 671-

Supplementary

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