Aplisens SGE-25.SMART Gebruikershandleiding - Pagina 11
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5.7. Construction Materials: (for whole probes).
Diaphragm:
Diaphragm:
Sensing module:
Casing for electronic parts:
Liquid filing the interior of the sensing module:
Cable shield:
Additional cable shield:
5.8. Ingress protection rating:
SGE-25.SMART, SGE-25S.SMART, SGE-25, SGE-25S, SGE-25C and SGE-16
6. TECHNICAL DESCRIPTION.
6.1. Principles of Operation
The hydrostatic level probes work by converting changes in the resistance of a piezoresistive bridge, while are
proportional t the pressure (of a hydrostatic column of liquid), into a standard current output signal. The active
sensing device is a silicon diaphragm with in-diffused piezoresistors. The (non-uniformized) electrical signal
obtained from the piezoresistive bridge is proportional to the input pressure (depth) and is converted by the
electronic circuit into an output signal.
6.2. Construction.
6.2.1. The probes are in the shape of a hermetically closed cigar, containing the active sensing device with
silicon and sealing diaphragm, as well as a plate with the electronic components.
The SGE-25S.SMART and SGE-25S probes additionally fitted with a diaphragm seal enabling depth
measurements to be carried out on dense media and media with suspended matter and impurities, such as
liquid waste (fig. 1, 3).
The output signal is passed through a special cable with a capillary used to connect the negative side of the
measuring diaphragm to the atmosphere. All metal parts of the probes are made of 00H17N14M2 stainless
steel (316L), and Hastelloy C276 (see section 5.7.), and the cable has a polyurethane shield.
6.2.2. Special versions of the probes can be produced with cables shielded by an additional teflon layer.
The shield covers the parts of the cable while is immersed in the medium being measured, as well as a
necessary additional segment.
The Teflon shield (in Ex version) is additional equipped in stainless steel cord escorted electrostatic charges
(see fig. 4.).
6.2.3. The probes are fitted with elements ensuring excess voltage protection: „transil" diodes between the
wires, and plasma surge arresters between the wires and the casing.
(The plasma surge arresters not included in Ex versions.)
6.3. Electronic circuit of the probes
Electronic circuit can be produced in two versions:
6.3.1. The digital version (SGE-25.SMART and SGE-25S.SMART probes).
The electronic circuit changes the signal from the sensing module into digital signal and input to a
microprocessor , which controls the probe's operation. Using data input during the production process, the
processor processes the conversion curve, adjusts for thermal errors and carries out linearization.
After processing, the digital signal is again converted into an analogue 4÷20mA current signal, with a
superimposed digital communication signal.
For communication with the probe via the signal line a special Aplisens communicator KAP is used.
6.3.2. The analog version (SGE-25, SGE-25S, SGE-25C and SGE-16 probes).
The electronic circuit changes the signal from the sensing module into an output signal 4...20 mA.
The electronic circuit is equipped in protective elements assured Intrinsic safety and resistance on electric
impulse.
The electronics board is hermetically flooded hardenable silicone resin in the stainless steel casing.
Stainless steel 316L (00H17N14M2)-for SGE-16, SGE-25S, SGE-25S.SMART
Hastelloy C276 – for SGE-25, SGE-25.SMART, SGE-25C
Stainless steel 316L (00H17N14M2)
Steel pipe, 316L (00H17N14M2)
Silicone oil
polyurethane
Teflon (fitted by arrangement)
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DTR.SG...04
(ENG)
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