Endress+Hauser Nivocompact FTC 831 User manual

nivocompact

FTC 831

Level Limit Switch

Installation and Operating Manual

BA 024F/00/en/07.98

015191-0001

Hauser

Endress

The Power of Know How

Contents Page

Application 3

Application Examples 3

Technical Data 4

The Measuring System 7

Function 8

Installation 9

Project Planning 9

Examples for Mounting 10

Mounting 11

Type key 11

Connection 13

Wiring Connection 13

EC 40 (Two-Wire Connection) for AC 14

EC 42 (Three-Wire PNP) for DC 15

EC 43 (Three-Wire NPN) for DC 16

EC 44 (Relay output) for DC and AC 17

Wiring On-Site 18

Calibration 19

Switching Delay 19

Safety Switching 20

Special Applications 21

Function Control 23

Maintenance 23

Troubleshooting 23

Replacement of Parts 25

Returning Parts for Repair 25

Shortening the Cable 26

Nivocompact FTC 831

Application

The Nivocompact FTC 831 is used for limit detection in silos containing bulk

solids (for minimum or maximum indication).

Also for use in the food processing industry.

For mounting in silos from above.

Application Examples

Lime Kaolin Grain Spices

Plaster Plastic Flour Semolina

Cement granulates Fodder

and similar bulk solids

Note:

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 831.

Application

Technical Data

Operating Data •Operating temperature in silo: –20 °C…+60 °C

•Operating pressure pein silo: up to 6 bar

•Max. permissible load on probe: 2500 N vertical

•Grain size of bulk solid: up to approx. 10 mm

•Minimum dielectric constant εrof material: 2.0

(factory-set, no adjustment required)

•Minimum adjustment of dielectric constant εrfor bulk solid: 1.6

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

•Storage temperature: –40 °C…+85 °C

Probe •Construction: rope probe with electronics at end of probe

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

•Process connection material: glass-fibre reinforced polyester (PBTP)

•Probe material: reinforced steel wire mesh and electronics with PE coating

•Insulation from material: fully insulated

Probe Length Tolerances Probe length Tolerance

up to 1 m +0 mm, –5 mm

up to 3 m +0 mm, –10 mm

up to 6 m +0 mm, –20 mm

up to 20 m +0 mm, –30 mm

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

Nivocompact FTC 831 Technical Data

Fig. 2

Dimensions Nivocompact FTC 831

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 (rms): < 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 42) or NPN (EC 43)

•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 (rms): 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.200 W

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

•Additional switching delay: max. 1.5 s

Type Key See Page 11 for order specification key and order code.

EMC Electromagnetic compatibility:

•Interference Emission to EN 61326, Electrical Equipment Class A

•Interference Immunity to EN 61326

•EMC Test Procedures see TI 241F/00/en

Subject to modification

Electronic Insert EC 40

for AC

(Two-Wire Connection)

Electronic Inserts EC 42, EC 43

for DC

(Three-wire Connection)

Electronic Insert EC 44

for DC and AC

(Relay Output)

Nivocompact FTC 831 Technical Data

Accessories•Gasket for thread G 11/2A;

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 831

•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.

The Measuring System

Function

A metal plate at the end of the probe, inside the insulation, and the area

around it (e.g. silo wall) constitute 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 end of the probe 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

end and its surroundings.

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

field at the end of the probe, then the capacitance CA increases and with it

the time constant τ.

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

831 is activated according to its switching mode.

Safety 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 circuit is blocked if the probe is covered

or the power supply fails.

Minimum Fail-Safe:

The circuit is blocked if the probe is uncovered

or the power supply fails.

A red LED on the electronic insert indicates the switching status.

See also Fig. 16 in Section »Safety Switching«, Page 20.

Fig. 5

The operation of the Nivocompact FTC 831

with rope probe is totally unaffected by

material build-up on the walls of the silo.

Nivocompact FTC 831 Function

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