CEMB USA TR–I ATEX User Manual

CEMB S.p.A. - 23826 MANDELLO DEL LARIO (LC) ITALY - Via Risorgimento 9

Phone [phone] - Fax [phone]

www.cemb.com e-mail: [e-mail]

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VIBRATION TRANSMITTER model TR–I/ATEX

Certified according to ATEX 94/9/CE Directive

Function

TR-I integrated transmitter measures absolute vibrations in the hazardous area of the support of
any rotating machine and it can be interfaced directly by 2-wire technique (current loop 4÷20 mA)
to an acquisition system (PLC or DCS).
TR-I minimizes the incidence of installation and wiring which could normally limit the application
possibilities of traditional vibration monitoring systems.

The transmitter is certified for application in classified area as II 2GD Ex d IIC T6 Gb

Ex tb IIIC T85°C Db

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

2

Transversal sensitivity

• < 5 %

Linearity

• ± 2% F.S. - 75 Hz

Outer casing (see enclosed dwg.99564-P)

• Stainless steel AISI 316L integrated transmitter body

• Aluminium Atex certified housing ( ¾”14NPT threads)

Insulation

• ≥ 10

8

Ω between signal and box

Axis of application

• any

Threads

• ¼”18NPT male

• M8x1,25 male

Mounting torque

• 5÷10 Nm

Maintenance

• none

Electrical connections

Bipolar schielded cable, section of the conductors:

• 2x1 mm² until 200 m

• 2x1,5 mm² until 400 m

• 2x2,5 mm² until 800 m

Possible arrangements when placing the order

• Measuring range

• Type of thread connection

Reference standards:

. EN 60079-0 (2009): Explosive atmosphere - General Rules
. EN 60079-1 (2007): Explosive proof housings “d”
. EN 60079-31 (2009): Equipments for combustible dust Part 31: protection by means of

housings “t”

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