CEMB USA TR–I ATEX - Manual (Page 2)

2
General description
The transmitter, fixed directly on the machinery, generates a current signal (4÷20 mA) proportional
respectively to the vibration speed or to the vibration acceleration.
It consists of a stainless steel body with male thread machine connection ¼” 18 NPT and a die-cast
aluminium casing for the terminal board with female thread connection ¾” NPT.
It can be supplied complete with mechanical accessories for machine connection threads different
from those proposed as standard.
Note: The transmitter is duly calibrated at CEMB laboratory according to the customer’s
indications. It is not possible to perform further recalibration later on. The transmitter is ready after
the correct calibration as shown on dwg 99564-P here enclosed and it does not need adjustments
or maintenance.
Principle of operation
A suitable accelerometer, inside the transmitter body, produces a voltage signal proportional to the
vibration acceleration. This signal is appropriately conditioned by an electronic circuit ( placed inside
the transmitter body) and converted into a 4÷20 mA current signal proportional to the vibration.
Technical characteristics
Power supply
• 24 Vdc (10 ÷ 30 Vdc) current loop 4 ÷ 20 mA (2 wires)
• Maximum load: see picture 2
Dynamic performances
• ±3% / 10Hz-1kHz (see picture 1)
• -3db / 2Hz – 2.5kHz
Environmental operating range
• - 40°C ÷ + 70°C
• IP 65 EN 60529/10.91 standards (with external connections protected by an adequate
sheath with ¾”14NPT thread, as per dwg. 96564-P)
Type of measurement
• Seismic omnidirectional (absolute vibration)
Dynamic range
• ± 18 g-pk / 2 ÷ 2500 Hz