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Indicadores de nivel capacitivo

Capacitance level indicator for continuous measurement of levels in tanks and containers.
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INDICADORES DE NIVEL CAPACITIVO

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APLICACION MODELO TECNOLOGIA MARCA
Nivel CapFox® EFT 7, Series 20, EFM, S 74x - Afriso
FUNCION (Indicadores) CODIGO SECCION
Indicadores de nivel capacitivo 02-2005 02

Compact capacitance level indicator CapFox® EFT 7.

Application
Capacitance level indicator for continuous measurement of levels in tanks and containers with filling heights of 200 mm to 3,000 mm. Suitable for non-conducting liquids, especially fuel oil or diesel.

Description
EFT 7 capacitance level indicator forms with its associated probe a single compact unit.
The unit is available with either a flexible band electrode or a rigid rod probe.
The flexible band electrode can be used for liquid levels from a minimum of 1,150 mm to a maximum of 3,000 mm.
The rod probe version with concentric screen tube is used for applications involving small containers with heights or diameters 200 mm to 1,500 mm. Please specify the length of the rigid rod probe when ordering.
Zero and full scale can be adjusted via an internal potentiometer.
The output signals are proportional to the filling level.

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Technical specifications

Measuring range 0/200 mm to 0/3,000 mm, depending on selected probe
Accuracy of measurement ±2 % FSD
Operating temperature range -20 °C/+50 °C
Process pressure No pressure
Process connection Aluminium Flexible band electrode G1B Rod probe G11/2B
Flexible band electrode 3,000 mm long flexible band electrode (can be shortened to 1,150 mm) with plastic probe weight

Rod probe
Electrode stainless steel 1.4571
Concentric screen tube, steel
Required probe length must be specified with order
Minimum length 200 mm
Maximum length 1,500 mm

Supply voltage AC 230 V or DC 24 V or AC 24 V
Power consumption AC 3 VA/DC 2 W
Output signals (load) 4–20 mA (max. 500 Ohm) 0–10 V (min. 10 kOhm) corresponds to measuring range 0/100 %
Capacitance range 0–200 pF
Housing Wall mounting housing made of impact resistant plastic (ABS) W x H x D: 104 x 65 x 144 mm
Protection IP 65 (EN 60529)
Electrical connections 2 x cable gland PG 11

Options/accessories

  • Flexible band electrode 6,000 mm
  • Analogue indicators (refer to page 26)
  • Digital display units with and without switching function (refer to pages 519 to 521)

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Capacitance level indicators CapFox® EFM 741/752/762.

Application
For continuous level measurement in containers, silos, tanks or filling systems. Suitable for liquid, powdery, electrically conducting or non-conducting media. Also suitable for pressurised or vacuum tanks.

Description
The capacitance level indicator consists of a series CapFox® EFM evaluation unit with digital display, a probe and a pre-amplifier which is factory fitted in the probe head. CapFox® EFM 741 provides only indication.
CapFox® EFM 752 indication plus one limit switch. The fully adjustable limit switch for a min. or max. signal, with variable hysteresis, can be used for control functions (voltage- free relay contact).
CapFox® EFM 762 has two independently adjustable limit switches to control filling/emptying processes.
The choice of probe (partly or fully insulated, rigid or flexible) depends on the properties of the material to be measured and the shape of the tank. Fully insulated probes must be used for conducting media. The probes are equipped with a capacitance voltage transducer (HF probe insert) in the probe head and are mounted vertically.

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Technical specifications

Measuring range 0/200 mm to 0/12,000 mm, depending on selected probe
Accuracy of measurement ±2 % FSD
Operating temperature range Ambient: -10 °C/+50 °C
Process pressure Depending on selected probe
Display 31/2 digit LCD display
Resolution 0.1 % (±1 digit)
Displayed units 0–100 % % liquid level
Supply voltage AC 230 V or DC 24 V
Power consumption 5 VA
Output signals 0–10 V/4–20 mA

Relay outputs (relay contacts)
EFM 741 None
EFM 752 1 x voltage-free changeover contact
EFM 762 2 x voltage-free changeover contacts

Switch rating AC 250 V 3 A DC 24 V 0.5 A
Visual indication (752/762) Green LED: normal operation Red LED: alarm condition Switch point indication
Fail-safe mode (752/762) Integrated selector switch for min. or max. fail-safe mode (low/high)
Housing Wall mounting housing with plug-in base, impact resistant plastic (ABS) Wx H x D: 76 x 150 x 115 mm
Protection IP 30 (EN 60529)

Ordering information
Complete measuring system EFM series (items to be ordered separately):
 

  • Evaluation unit EFM
  • HF probe insert type 3640 211
  • Probe
  • Concentric screen tube (not required with flexible band electrode since the earth electrode is already integrated)


Select according to the operating conditions.
Special customerspecific probes are available in addition to the standard probes.

 

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Capacitance level indicator with Ex approval CapFox® S 74x.

Application
For continuous level measurement in tanks and vessels in Ex zones 0, 1 and 2. Suitable for liquids, powders, electrically conducting or non-conducting media. Also suitable for pressurised or vacuum tanks.

Description
The capacitance level indicator consists of a series CapFox® S 74x evaluation unit with digital display, a probe and an Ex pre-amplifier which is factory fitted in the probe head.
CapFox® S 74x has an intrinsically safe probe circuit. In order to guarantee the intrinsic safety of the circuit, the S 74x evaluation unit may only be used in conjunction with a type Ex 3640 021HF preamplifier and a rigid series 88 capacitance probe. The evaluation unit must be installed outside of the Ex zone.
The choice of probe (partly or fully insulated, rigid) depends on the properties of the material to be measured and the shape of the tank. Fully insulated probes must be used for conducting media. The probes are equipped with a capacitance voltage transducer (HF probe insert) in the probe head and are mounted vertically.

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Technical specifications

Measuring range 0/200 mm to 0/3,000 mm, depending on selected probe
Accuracy of measurement ±1.5 % FSD
Operating temperature range Ambient: -10 °C/+50 °C
Process pressure Depending on selected probe
Display 31/2 digit LCD display
Resolution 0.1 % (±1 digit)
Displayed units 0–100 % liquid level
Supply voltage AC 230 V
Power consumption 5 VA
Outputs 0–10 V/0–1 mA/4–20 mA
Visual indication Yellow LED power "on"
Intrinsically safe circuit UM = 250 V, U0 = 13.0 V, I0 = 76 mA P0 = 0.25 W, C0 = 1.0 μF, L0 = 6.1mH
Housing Wall mounting housing with plug-in base, impact resistant plastic (ABS) Wx H x D: 76 x 150 x 115 mm
Protection IP 30 (EN 60529)
Ex approval II (1) G [E Ex ia] II C T6 BASEFA 02ATEX0088
HF pre-amplifier Ex HF pre-amplifier insert Ex type 3640 021 exclusively for the CapFox® S 74x to ensure the intrinsic safety of the circuit. The pre-amplifier is factory fitted in the probe head.

Ordering information
Complete measuring system (items to be ordered separately):
 

  • Evaluation unit S 74x
  • HF probe insert type 3640 021
  • Rigid series 88 probe
  • Concentric screen tube Refer to pages 30, 31 for probes.


Select according to the operating conditions.
Special customerspecific probes are available in addition to the standard probes.

Options

  • Supply voltage DC 24 V

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