Cemb ST-NC/8 Proximity Probe

www.cemb.com
DISPLACEMENT TRANSDUCERS
T-NC FUNCTION
The T-NC transducers detect the displacement of a target facing to the probe. The different
dimensions of the probe allow its application for the detection of different measuring ranges.
They are powered at 24 Vdc and provide a 0÷10 Vdc or 4÷20 mA signal proportional to the
displacement.The transducer is used for no-contact measurement of displacement and expansion
of rotating machines. The probe structural features allow its installation in a particularly heavy
environment, with the presence of steam, oil and aggressive agents (typically on steam turbines,
gas turbines, compressors, etc.).
GENERAL DESCRIPTION
These transducers are composed of a ST-NC/16, ST-NC/20 or ST-NC/30 probe and a CT-NC
converter contained in a die-cast aluminium housing, complete with a connector (according to MIL standards)
for the connection of the transducer to the acquisition system.
The principle of operation is based on the generation of an electromagnetic high frequency field, radiated by
the probe, which induces an eddy current in the target. The intensity of this eddy current depends directly on
the distance between probe and target and it is converted into an electrical signal processed by the converter.
The probe consists of an AISI 304 stainless steel body and it is supplied with a coaxial teflon cable. The converter is manufactured with microprocessor
technology to ensure measurement linearity and precision. The generated electrical signal, depending on the distance between probe and target is
opportunely linearized during the transducer calibration phase.
It is supplied calibrated foreseeing the AISI 4140 target (calibration with different targets are available on request).
TECHNICAL FEATURES Composition T-NC
• AISI 304 stainless steel ST-NC probe
• CT-NC converter
Power supply
• 24 Vdc (20 to 30 Vdc)
External connections
• MIL C5015 5-pin connector (max conductors section 2,5 mm2)
Environmental application field
• Probe -50°C to +175°C
• Converter -20°C to +70°C
Measuring field
• Model 16
• Model 20
• Model 30
Linearity
• ± 2% for the entire measuring field and within the indicated operating temperatures
Insulation
• ≥108 Ω between signal and body/housing
Electrical connections
• Three-polar shielded cable, typical conductors section 3x1 mm2
Possible predispositions to the order
PROBE:
• Measuring field
• Cable length
• Cable armour
• Body length
4 mm from 0,5 to 4,5 mm 8 mm from 0,5 to 8,5 mm 13 mm from 0,5 to 13,5 mm
sensitivity 2,5V/mm sensitivity 1,25V/mm sensitivity 0,77V/mm
CONVERTER:
• Measuring field
• Cable length
• 0÷10V or 4÷ 20 mA output
B A L A N C I N G
M A C H I N E S