Endress+Hauser Nivocompact FTC 731 User manual

nivocompact

FTC 731

Level Limit Switch

Installation and Operating Manual

BA 023F/00/en/03.92

015172-0001

Hauser

Endress

The Power of Know How

BA 023F/00/en/03.92

015172-0001

HD/CV4.2

Contents Page

Application 3

Application Examples 3

Technical Data 4

The Measuring System 6

Function 7

Installation 8

Project Planning 8

Examples for Mounting 9

Mounting 10

Type key 10

Connection 12

Wiring Connection 12

EC 30 (Two-Wire Connection) for AC 13

EC 32 (Three-Wire PNP) for DC 14

EC 33 (Three-Wire NPN) for DC 15

EC 34 (Relay Output) for DC and AC 16

Wiring On-Site 17

Calibration 18

Switching delay 18

Saftey switching 19

Particular Cases: Capacitance Calibration 20

Function Control 22

Maintenance 22

Troubleshooting 22

Replacement of Parts 24

Returning Parts for Repair 24

Nivocompact FTC 731

Application

The Nivocompact FTC 731 is used for limit detection in silos containing bulk

solids (for minimum or maximum indication).

It is also for use in the food processing industry.

It can be mounted in the silo from any direction.

Application Examples

Plastic granulates Grain Spices

Lime Kaolin Flour Semolina

Plaster Fodder

Cement

and similar bulk solids

Note:

Fine grained bulk solids should have dielectric constants εr≥1,6

Please contact us for advice if the dielectric constant of the bulk solid is not

known.

Fig. 1

Limit detection in bulk solid silos with the

capacitive level limit switch Nivocompact

FTC 731.

Application

Technical Data

Operating Data •Operating temperature in silo: –20 °C…+100 °C with dry bulk solids;

up to +60 °C with moist bulk solids

•Operating pressure pein silo: up to 6 bar

•Max. permissible load on probe: 4000 N lateral

•Grain size of material: up to approx. 10 mm

•Minimum relative dielectric constant εrof material: 2.0

(Factory-set, without calibration)

•Minimum adjustable dielectric constant εrof material: 1.6

•Ambient temperature for housing: –20 °C…+60 °C

•Storage temperature: –40 °C…+85 °C

Probe •Process connection: parallel thread G 11/2A acc. to DIN ISO 228/I

•Material of process connection: fibre-glass reinforced polyester (PBTP)

•Material of probe: fibre-glass reinforced polyester (PBTP)

•Insulation from material: fully insulated

Housing Versions •Aluminium housing, IP 55

•Aluminium housing, IP 66

•Aluminium housing with synthetic coating, IP 66

•Synthetic housing in PBTP, IP 66

(Protection IP…acc. to DIN 40050)

Cable Gland •Housing IP 55: standard PG in nickel-plated brass with NBR gasket

for cable diameter 7…10 mm.

•Housing IP 66: water-tight PG in polyamide with Neoprene-CR gasket

for cable diameter 5…12 mm.

Fig. 2

Dimensions Nivocompact FTC 731.

Nivocompact FTC 731 Technical Data

Electronic Inserts

•Terminal connections: for max. 2.5 mm2

•Measuring frequency: approx. 1.6 MHz

•Switching delay: approx. 0.5 s…approx. 20 s, selectable

•Minimum/maximum fail-safe switching: selectable with rotary switch

•Switching indication: red LED

•Power supply U∼: 21 V…250 V, 50/60 Hz

•Connected loads, short-term (max. 40 ms): max. 1.5 A;

max. 375 VA at 250 V;

max. 36 VA at 24 V

•Maximum voltage drop: 11 V

•Connected loads, continuous: max. 350 mA;

max. 87 VA at 250 V;

max. 8.4 VA at 24 V

•Minimum load current at 250 V: 10 mA (2.5 VA)

•Minimum load current at 24 V: 20 mA (0.5 VA)

•No-load current (eff.): < 5 mA

•Power supply U =: 10 V…55 V

•Superimposed AC voltage Upp: max. 5 V

•Current consumption: max. 15 mA

•Load connection: Open Collector; PNP (EC 32) or NPN (EC 33)

•Switching voltage: max. 55 V

•Connected load, short-term (max. 1 s): max. 1 A

•Connected load, continuous: max. 350 mA

•Residual current with transistor blocked: < 100 µA

•Protected against reverse polarity

•Power supply U =: 20 V…200 V

Power supply U∼: 21 V…250 V, 50/60 Hz

•Current consumption (eff.): max. 5 mA

•Peak inrush current: max. 200 mA, max. 5 ms

•Pulse current: max. 50 mA, max. 5 ms

•Pulse frequency: approx. 1.5 s

•Output: potential-free change-over contact

•Contact load capacity:

U∼max. 250 V, I∼max. 6 A,

P∼max. 1500 VA (cos ϕ= 1) or P∼max. 750 VA (cos ϕ ≥ 0.7)

U = max. 250 V, I = max. 6 A, P = max. 180 W

•Operating life: min. 105switchings at max. contact load

•Additional switching delay: max. 1.5 s

Type Key

See Page 10 for order specification key and order code.

Subject to modification

Electronic Insert EC 30

for AC (Two-wire Connection)

Electronic Inserts EC 32, EC 33

for DC (Three-wire Connection)

Electronic Insert EC 34

for DC and AC (Relay Output)

Technical Data

Accessories •Gasket for thread G 11/2A;

in elastomer/fibre (asbestos-free) supplied.

•Protective sun cover for aluminium housing

Material: polyamide

The Measuring System

The Nivocompact is an electronic switch.

The entire measuring system consists of:

•Nivocompact FTC 731

•power supply and

•connected control systems, switches, signal transmitters (e.g. process

control systems, PLC, relays, microcontactors, lamps, sirens etc.).

Fig. 3

Dimensions of protective sun cover

(accessory).

This cover prevents condensation in the

housing.

Fig. 4

The measuring system.

Nivocompact FTC 731 The Measuring System

Function

A metal sheet at the tip of the probe, within the insulation, and the

surroundings (e.g. silo walls) form the two electrodes of a capacitor, with a

high frequency voltage between them.

The limit value is based on the principle of a discharge circuit:

As long as the probe tip is in air with a dielectric constant of εr= 1, then the

discharge time constant is τ= R x CAwhere R is the resistance of the circuit

and CAthe capacitance of the capacitor formed by the probe tip and its

surroundings.

If bulk material with a dielectric constant εr≥2.0 moves into the electrical

high frequency field at the probe tip, then the capacitance CAincreases

and with it the time constant τ.

This change in the time constant is evaluated and causes the Nivocompact

FTC 731 to switch.

Fail-Safe Switching

The built-in feature for minimum/maximum fail-safe switching allows the

Nivocompact to be used in all applications requiring high operational safety:

Maximum Fail-Safe:

The current circuit is blocked if the probe is covered

or the power supply fails.

Minimum Fail-Safe:

The current circuit is blocked if the probe is uncovered

or the power supply fails.

A red LED on the electronic insert indicates switching status.

See also in Section »Safety Switching«, Page19

Fig. 5

Operation of the Nivocompact FTC 731 with

rod probe is not affected by material

build-up, even when several centimetres

thick, at the silo wall.

Function

Installation

Project Planning

Silo Material The Nivocompact FTC 731 can be installed in silos made of various

materials (e.g. metal, plastic, concrete).

Installation Point Note the angle of material flow or the outlet funnel when determining the

measuring point.

The Nivocompact switches (also with bulk solids with very small dielectric

constants) when the probe end is covered by a few centimetres of material

or when the material descends a few centimetres below the probe end.

The filling stream should not be directed onto the probe.

Installation in the Open When installing in the open, the protective sun cover as an accessory

protects the Nivocompact with the aluminium housing from excessive

temperatures and from condensation which may form in the housing due to

large temperature variations.

Correct Installation a) Protective sun cover for mounting in the open.

b) Heat insulation on the silo wall with high temperatures in the silo.

Incorrect Installation c) Incoming material can damage the probe.

The filling curtain can cause error switching.

Cable gland pointed upwards can allow moisture to enter.

Minimum Distances A minimum distance of 200 mm between the probe ends of two

Nivocompact FTC 731 instruments must be maintained to ensure

that there is no mutual interference.

The distance between the probe end of a Nivocompact FTC 731 and the

probe end a Nivocompact FTC 831 must be at least 500 mm.

To ensure that this distance is maintained when the rope probe of the

FTC 831 is swinging, a greater distance than this is recommended

especially with pneumatic systems.

The distance between the probe end of a Nivocompact FTC 731 and a

metal wall must be at least 120 mm.

Correct Installation Incorrect Installation

Fig. 6

General information for installing the

capacitive level limit switch Nivocompact

FTC 731.

Nivocompact FTC 731 Installation

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