SEISMIC VELOCITY TRANSDUCER T1-40
Measurement of Omnidirectional Absolute Vibrations
Certified according to ATEX 94/9/CE directive
OPERATION
Transducer T1-40 serves for seismic measurement of the absolute vibrations of the machinery through direct fixing
(omnidirectional) on the supports of the vibrating part in a dangerous area. It supplies an output signal directly
proportional to the vibration speed of the point to which it is fastened. Such signal is then processed in a safe zone by
a measuring channel of the “T” series.
The transducer, in its various models, is certified for applications in areas classified as:
ZONE 0 ZONE 1
- Ex II 1GD Ex ia IIC T6 Ex iaD 20 T85°C - Ex II 2GD Ex ia IIC T6 Ex iaD 21 T85°C
- Ex II 1GD Ex ia IIC T5 Ex iaD 20 T100°C - Ex II 2GD Ex ia IIC T5 Ex iaD 21 T100°C
- Ex II 1GD Ex ia IIC T4 Ex iaD 20 T135°C - Ex II 2GD Ex ia IIC T4 Ex iaD 21 T135°C
PRINCIPLE OF OPERATION
A voltage, proportional to the speed of vibration, is induced in a coil suspended seismically to the transducer body
and immersed in a field generated by a permanent magnet rigidly fastened to the transducer body.
SPECIFICATIONS
Type of measurement : SEISMIC (absolute vibrations)
Field of application : AMPLITUDE = ± 1000 µm p.p.
FREQUENCY = 10÷1000 Hz
DIRECT. OF VIBR. = ANY
Rated sensitivity : 21,2 mV/mm/sec (RMS) a 25°C
Typical frequency : 12 Hz
Damping coeff. : 0.7
Cross sensitivity : < 7%
Output impedance : 1 Kohm at 25°C
Power supply : None
Ambient operating range : Temperature = see certification
Humidity = 100% max
Ambient = IP65 EN 60529/10.91
External connections : Connector MS/MIL-C-5015 series 3102/16, std. accessory
Outer casing material : Alluminium P.Al.Si 5.5 (Zone 1)
or
Stainless steel AISI 303 (Zone 0)
Weight of transducer : approx. 0.300 kg
Fastening : Screw, M8x1.25 – L=16 mm
Maintenance : None
Enclosed drawings : 17951 = Overall dimensions, layout and el. connections.
TRANSDUCER POSITIONING
Refer to drawing 17951.
N.B.: The operations should be performed possibly with the machine stationary and
taking the greatest care so as not to damage the internal mechanisms of the transducer.
1) On the support to be measured, drill a hole M8x1.25, 17 mm min. depth, making sure of its perpendicularity (if it is
not possible to reach the depth of 17 mm, provide spacers of suitable thickness between the support surface and
the transducer).
The surface on which the transducer rests should be flat and smooth. It is advisable to apply a layer of silicone
between the casing and the resting surface.
2) Screw the transducer in the M8x1.25 hole provided at point 1. Avoid knocks on the transducer. The use of a
thread compound is advisable during tightening.
3) Carry out the electrical connections of the transducer to the measuring instrument by using the free lead
connector (supplied as standard).
Notes regarding positioning:
- The wiring MUST be made with cables resistant to agents related to the workplace (oils, corrosive acids,
temperature, etc.).
- Shielded cables MUST be used. Make sure that the shield is connected to the frame earth (GND=ground) at just
one of the cable ends (the instrument side is advised).
- The electrical conductors must all have a minimum cross section of 1.0 mm², max. possible cross section = 2.5
mm² for a max. distance of approx. 800 metres.
T1-40-ATEX 04 gb 2
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